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INVESTIGATION OF UTILIZING RAINWATER AS ALTERNATE SOURCE OF WATER
IN TEJGAON INDUSTRIAL AREA
MAHIR ASEF
S.M.MUNTASIR MASUM
SOUMITRA PAUL
DEPARTMENT OF CIVIL ENGINEERING
AHSANULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGY
MAY, 2012
Soumitra Paul, Mahir Asef
ii
INVESTIGATION OF UTILIZING RAINWATER AS ALTERNATE SOURCE
OF WATER IN TEJGAON INDUSTRIAL AREA
A Thesis
Submitted By
Mahir Asef (08.01.03.003)
S.M.Muntasir Masum (08.01.03.029)
Soumitra Paul (08.01.03.047)
In partial fulfillment of the requirement for the degree of
Bachelor of Science in Civil Engineering
Under the supervision of
Dr. Abdullah Al-Muyeed
Associate Professor
Department of Civil Engineering
AHSANULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGY
May, 2012
Soumitra Paul, Mahir Asef
iii
CE 450
Project & Thesis
Approved as to style and content by
Dr. Abdullah Al-Muyeed
Associate Professor, Department of Civil Engineering, AUST
Soumitra Paul, Mahir Asef
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DECLEARATION
We hereby declare that the Project work submitted here has been performed by us and
this work has not been submitted for any other degree.
Mahir Asef
S.M.Muntasir Masum
Soumitra Paul
Soumitra Paul, Mahir Asef
v
ACKNOWLEDGEMENT
We would like to express our sincere appreciation and gratitude to our supervisor
Dr. Abdullah Al-Muyeed for his unending assistance, valuable suggestion, co-
operation and encouragement. The Project could not have been prepared in such a
manner without his ultimate advice and direction.
We are highly thankful to Dr. Md. Anwarul Mustafa, Head, Department of Civil
Engineering for his exemplary character that inspires us throughout the whole track of
this thesis work.
We are also thankful to Bangladesh Meteorological Department, Dhaka Water Supply
& Sewerage Authority (DWASA), Bangladesh Power Development Board (BPDB)
and their official web site for their informative documents and data sheet. It saved a
lot of time to visit those offices physically.
We would also like to express our thankfulness to the official members of ACI
Limited and Runner Group of Companies for providing us all the information needed
for the survey work.
We would also like to appreciate the staff members of Civil Department, Engineering
section members, and our co-workers in helping us to complete the research work.
Finally, we are grateful to GOD that our research has been completed successfully
and within schedule time.
Soumitra Paul, Mahir Asef
vi
ABSTRACT
In many developing countries, the stress of rapidly growing populations,
mismanagement of resources and changing climate has created a burden on already
compromised water resources. In Bangladesh, where a significant proportion of the
population is without access to improved water source, the urgency for clean available
water sources to sustain healthy and productive human and natural populations has
become a priority. Rainwater harvesting is a familiar term for Bangladesh. People in
areas that lack drinking water, particularly the coastal areas and the rural areas in the
country, practice rainwater harvesting. The high annual rainfall in the country makes
rainwater harvesting a logical solution for the arsenic contamination of ground water
in Bangladesh (Rahman et al, 2003). Most of RWH literature is centered on the
potential and implementation of rainwater harvesting systems, however not much
focus has been placed on examining the demand satisfaction of these systems. This
study investigates the reliability of rooftop rainwater harvesting (RRWH) as a key
priority source of water supply for residential and industrial uses. This research work
aims to develop a guideline for economical RWH in the urban areas. For this purpose
Dhaka city was selected as the model town representing urban areas of Bangladesh.
An experiment, carried out on the rooftop of AUST to prove that RWH can easily be
adopted for the urban buildings. The experiment was followed by a survey on the
industrial areas to justify that not only residential area but also the industrial areas can
be considered for RWH. The research project also highlights on the physical and
chemical properties of harvested rainwater, which was tasted in laboratory. Analysis
Soumitra Paul, Mahir Asef
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on cost-benefit, storage capacity of AUST, ACI Limited and Runners Group of
Companies are also done in this study. A statistical analysis is also added in this
research to correlate different parameters of this research work. In the end different
results gained from this research work are represented through GIS, to prove
economical effect of rainwater harvesting in the residential and industrial areas of
Bangladesh and establish RWH as an alternative source of safe water.
Soumitra Paul, Mahir Asef
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Contents
ACKNOWLEDGEMENT ...................................................................................................... v
ABSTRACT ..................................................................................................................... vi
List of Tables ...................................................................................................................... x
List of Figures ..................................................................................................................... xi
List of Abbreviations ............................................................................................................ xiii
CHAPTER 1 ...................................................................................................................... 1
INTRODUCTION ................................................................................................................... 1
1.1 General ...................................................................................................................... 2
1.2 Background of the Study (RWH) .................................................................................... 4
1.3 Rationale of the study ...................................................................................................... 6
1.4 Purpose of the study ........................................................................................................ 7
1.5 Objective of the Study ..................................................................................................... 7
1.6 Hypothesis ...................................................................................................................... 8
1.7 Limitations of the Study .................................................................................................. 8
CHAPTER 2 ...................................................................................................................... 9
LITERATURE REVIEW ....................................................................................................... 9
2.1 Rainwater Harvesting .................................................................................................... 10
2.2 RRWH Potential and Reliability ................................................................................... 13
2.3 Adoption of RWH ......................................................................................................... 16
2.3.1 Asia ......................................................................................................................... 16
2.3.2 Other Regions of the World ................................................................................... 17
2.3.3 Bangladesh ............................................................................................................. 19
CHAPTER 3 .................................................................................................................... 22
METHODOLOGY ................................................................................................................ 22
3.1 METHODOLOGY ........................................................................................................ 23
3.1.1 DATA COLLECTION PROCEDURE .................................................................. 24
3.1.1.1 Survey ......................................................................................................... 24
3.1.1.1.1 Study Approach ................................................................................. 24
3.1.1.1.2 Condition of Rainfall in Dhaka City .................................................. 28
Soumitra Paul, Mahir Asef
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3.1.1.1.3 Study Area ......................................................................................... 29
3.1.1.2 Small Scale RWHS ..................................................................................... 30
3.1.1.2.1 Experimentation ................................................................................. 30
3.1.1.2.1.1 Equipment ................................................................................ 30
3.1.1.2.1.2 Installation Process.............................................................. 31-33
3.1.1.2.1.3 Cost Measurements .................................................................. 34
3.1.1.2.2 Trials .................................................................................................. 35
3.1.1.2.3 Sample Collection & Storage ............................................................ 36
3.1.1.2.3.1 Sampling Procedure ................................................................. 37
3.1.1.2.3.2 Collection and Storage of Research Project Sample ................ 39
3.1.2 DATA ANALYSIS ................................................................................................ 40
3.1.2.1 Test the quality of sample ........................................................................... 41
3.1.2.2 Compare Sample Data With Standards ....................................................... 42
3.1.2.3 Analysis of Survey Data & Storage Calculation ......................................... 43
3.1.2.3.1 Storage capacity Calculation ............................................................. 44
3.1.2.3.2 Contribution to Groundwater Recharge ............................................. 47
3.1.2.3.3 Cost Benefit Analysis ........................................................................ 48
3.1.3 RESULT ................................................................................................................. 51
3.1.3.1 Water Sample Quality ................................................................................. 51
3.1.3.2 Storage Capacity Comparison ..................................................................... 55
3.1.3.3 Statistical Analysis: ..................................................................................... 57
CHAPTER 4 .................................................................................................................... 61
GIS PRESENTATION .......................................................................................................... 61
CHAPTER 5 .................................................................................................................... 66
CONCLUSION .................................................................................................................... 66
5.1 CONCLUSION ............................................................................................................. 67
5.2 MAJOR FINDING of THE STUDY ............................................................................. 68
5.3 FUTURE SCOPE of STUDY ....................................................................................... 69
References .................................................................................................................... 70
APPENDIX ...................................................................................................................... a
Questionnaire ...................................................................................................................... b
Soumitra Paul, Mahir Asef
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List of Tables
Table 2.1: Coefficient of runoff for common roof types (Kumar, 2004) 14
Table 3.1: Prediction of population and water demand in Dhaka urban area 25
Table 3.2: Historical data of water supply 27
Table 3.3: Cost of equipment’s 34
Table 3.4: Harvested Sample Quality 41
Table 3.5: University (AUST) Water Sample Quality 41
Table 3.6: Comparison with standard values 43
Table 3.7: Storage Comparison between AUST, ACI limited and
Runners Group of Companies 55
Table 3.8: One-Sample Test 57
Table 3.9: Paired Samples Correlations 58
Table 3.10: Paired Samples Test 58
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List of Figures
Figure 3.1: Showing water demand and supply with growing population 25
Figure 3.2: Groundwater depletion with time (years) 26
Figure 3.3: Monthly average rainfall of Dhaka 28
Figure 3.4: Study Area (AUST, block-c) 29
Figure 3.5(a): Layout of the project 32
Figure 3.5(b): RWHS on AUST 33
Figure 3.6: Components (a,b) & Layout of the Filter bed (c,d) 36
Figure 3.7: Comparison of Costs-Benefits Analysis 50
Figure 3.8: Comparison of pH 51
Figure 3.9: Comparison of Turbidity (JTU) 52
Figure 3.10: Comparison of TDS (mg/l) 53
Figure 3.11: Comparison of Iron (mg/l) 53
Figure 3.12: Comparison of between AUST, ACI limited and Runners Group of
Companies 56
Figure 3.13: One sample t test 59
Figure 3.14: Paired Sample Correlation 59
Soumitra Paul, Mahir Asef
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Figure 3.15: Comparison of Significance (One & Paired Sample) 60
Figure 4.1: Rainfall Intensity 63
Figure 4.2: Summarized Information Comparing the Study Areas 65
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List of Abbreviations
AUST Ahsanullah University of Science and Technology
BPDB Bangladesh Power Development Board
BS Bangladesh Standard
CARE Co-operation for American Relief Everywhere
CWSSP Community Water Supply and Sanitation Project
DASCOH Development Association for Self-reliance Communication and
Health
DPHE Department of Public Health Engineering
DRWH Domestic Rainwater Harvesting
DWASA Dhaka Water Supply & Sewerage Authority
IWM Institute of Waste Management
NGO Non-governmental organization
RWH Rainwater Harvesting
RWHS Rainwater Harvesting System
RRWH Rooftop Rainwater Harvesting
UNICEF United Nations International Children's Emergency Fund
UNEP United Nations Environment Programme
WHO World Health Organization
WASA Water Supply & Sewerage Authority
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CHAPTER 1 INTRODUCTION
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1.1 General:
Bangladesh is a developing country of South Asia. The development of any country
depends largely on, how they use their natural resources. Among natural resources
gas, oil, coil, lime are mainly named. But sea, river, forest, snow/rainfall are also
important elements of natural resource for any country. But with the increasing
demand and excessive use these resources are on the verse of decay.
Water is essential to sustain life, and a satisfactory supply must be available to all. But
in Bangladesh there has been acute scarcity of safe drinking water for recent years.
Because of excessive use of ground water the country is now facing arsenic problem.
Discovery of the presence of arsenic in the drinking water in Bangladesh has been a
cause of red alert in the public health arena. According to Bangladesh Arsenic
Mitigation and Water Supply Project out of 4 million tube-wells installed in
Bangladesh, 1.2 million have been found contaminated with arsenic
(www.bamwsp.org). What is startling is that the arsenic concentration level in 30-40
percent wells of the affected area is over 500 ppb or 50µg/liter (World Bank, 2001).
For Bangladesh, it is estimated that 27 to 60% of the population is at risk from arsenic
exposure (Smith, Lingas and Rahman, 2000). This is equivalent of 28-50 million
people in Bangladesh and most of them live in rural areas.
Soumitra Paul, Mahir Asef
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Rainwater Harvesting and storage do not constitute a new technology. It has been
used for domestic, agricultural, runoff control, air-conditioning etc. for a long time in
different parts of the world. However, rainwater harvesting is not a common practice
in Bangladesh. Only 35.5 percent households have been found to use the rainwater as
drinking water source during the raining seasons in coastal areas having high salinity
problems (Hussain & Ziauddin, 1989). In the backdrop of arsenic contamination in
groundwater of Bangladesh, rainwater has been considered as a potential source of
arsenic free water.
Soumitra Paul, Mahir Asef
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1.2 Background of the Study (RWH):
Rainwater has been harvested in Bangladesh from time immemorial. Traditional
rainwater collection was very simple and was usually done by tying an old saree or a
sheet to four posts in the yard and collecting the water in a traditional earthenware
pot, a Motka. The introduction of handpumps in the 1970s and the widespread
installation of shallow well handpumps through the private sector in the 80s and 90s,
brought water close to the home in many areas of Bangladesh. In the coastal belt of
Bangladesh groundwater is often saline and so, where deep tube wells that would
yield sweet water were not possible, rainwater harvesting was practiced. Several
NGOs were active during the Decade and community-wide rainwater harvesting in
Dacope upazilla, completed with the assistance of the Bangladesh Agricultural
University in 1988, was reported in Waterlines in 1992.
In 1994 UNICEF developed an interest in rainwater harvesting and in support of the
Department of Public Health Engineering; a pilot activity was undertaken in
Chittagong. It was thought that rainwater harvesting would be useful in the
Chittagong Hill Tracts and to expand water supply in areas with saline water in the
coastal belt. Very few systems were built, mainly due to costs and rainwater
harvesting never took off.
Rainwater harvesting regain its emphasis in the last years of twentieth century, mainly
because of the increasing awareness about the adverse effect of arsenic. In 1998,
while looking for alternative solutions for people who were losing their safe water
supply due to the contamination of their well with arsenic, WHO argued for
Soumitra Paul, Mahir Asef
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consideration of rainwater as a potential replacement. Initially there was little
response, as rainwater was considered not to be adequate all year round, systems
would be too expensive, and doubts existed about the water quality. Several meetings
were convened with various parties that had once supported rainwater harvesting and
slowly interest was developing among the professionals. A Swiss technology transfer
agent, SKAT, came to support NGO Forum for Drinking Water Supply and Sanitation
and indicated the feasibility.
WHO and SKAT collected up-to-date information from the Lanka Rainwater
Harvesting Forum and an action-research proposal was prepared. By June 2000, NGO
Forum received support from SDC to undertake a 3½ year project. At the same time,
International Development Enterprises, Bangladesh, a NGO focusing on developing
affordable technologies, locally, for the poor, at a fair market price, through a private
sector supply chain also started a pilot scheme in a community-based water supply
project area where it was collaborating with CARE and Development Association for
Self-reliance Communication and Health (DASCOH) in what is called the Water
Partnership Project. UNICEF and DPHE, through the pilot projects on arsenic
mitigation, have also started again to try out rainwater harvesting again and offer it as
an option in their projects. WHO supported the pilot activities of the various agencies
through regular consultation and technical advice. As it was at least the second time
that rain water harvesting was initiated in Bangladesh, it was imperative to do it right
this time (Han A. Heijnen, Environmental Health Advisor; [email protected]).
Soumitra Paul, Mahir Asef
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1.3 Rationale of the study:
In Bangladesh rainwater has traditionally been a security in areas where water has
been scarce. Islands or coastal areas may have plenty of water, but most of it will be
saline and not tasty to drink. In hard water areas or where water contains a lot of iron,
people may be more inclined to use rainwater for drinking and cooking purposes.
Hilly wet zone areas, as population pressures increase, people are forced to move
uphill into areas that remained uninhabited before. Water points will be available only
below the level where people live and daily drudgery in collecting water is the
consequence. This does not have to be the case as areas with 2 monsoons can very
well have an excellent water collection regime, even with small roof surface or
storage.
Our study mainly highlights the urban areas of Bangladesh especially Dhaka city.
Rainwater harvesting can ease water crisis in Dhaka. Rainwater could potentially
supply about 15% of city’s water requirement. The city’s Water & Sewerage
Authority (WASA) has the capacity to produce up to 1800 million liters a day, while
the demand is in excess of 2000 liters. A study carried out by IWM suggested that
around 150000 million liters’ rainwater could be harvested during the annual
monsoon. So the intensity of this research work is to reduce the problem of safe
drinking water.
Soumitra Paul, Mahir Asef
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1.4 Purpose of the study:
The purpose of the study is to develop a rainwater harvesting system on the rooftop of
urban residential and industrial buildings.
1.5 Objective of the Study:
The objectives which are highlighted in the study are-
To study and determine the rainwater harvesting methods of Dhaka city to
establish RWHS as an alternate solution of water supply
To determine the suitability of harvesting rainwater for drinking and other
purpose in the residential and industrial buildings
To develop a project to assess the feasibility of incorporating rainwater harvesting
from selected roof area of Ahsanullah University of Science and Technology
(AUST) and estimate it’s contribution on the total consumption of the university
To meet the ever increasing demand for water, harvest rainwater to recharge the
groundwater and enhance the availability of groundwater at specific places and
time and thus assure a continuous and reliable access to groundwater
To reduce the rate of power consumption for pumping of groundwater and
determine the cost-benefit ratio
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1.6 Hypothesis:
Hypothesis is important for a research. It is a tentative generalization, the validity
of which has to be tested. It is made in order to find out the correct and valid
explanation of certain phenomena through investigation. Rainwater harvesting in the
urban area is becoming popular day by day. In the research it has been conducted to
give comprehensive insights about harvesting rainwater procedures on the rooftop of
urban area buildings. Based on the research topic a hypothesis has been drawn that
will be tested by statistical data got from the study.
“It is more economical to harvest rainwater than ground water pumping”
1.7 Limitations of the Study:
There are also some limitations in RWHS and the limitations are-
Maximum output can be gained in the monsoon only
Applicable only for buildings
Only urban areas would be taken in consideration
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CHAPTER 2 LITERATURE REVIEW
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2.1 Rainwater Harvesting
Water is essential for all life and used in many different ways, it is also a part of the
larger ecosystem in which the reproduction of the bio diversity depends. Fresh water
scarcity is not limited to the arid climate regions only, but in areas with good supply
the access of safe water is becoming critical problem. Lack of water is caused by low
water storage capacity, low infiltration, larger inter annual and annual fluctuations of
precipitation (due to monsoonic rains) and high evaporation demand.
The capture and utilization of rainwater is an ancient tradition which dates back to
similar techniques used in today’s Iraq around 5000 years ago. Modern methods
usually represent improvements with respect to technical variations (Mbilinyi, 2005).
The term rainfall harvesting' is broadly defined as the collection of any form of
precipitation from a catchment (Babu and Simon, 2006). Rainwater harvesting
(RWH) is the process of collecting and storing rainwater from rooftops, land surfaces
(steep slopes, road surfaces and rock catchments) using simple components (pots,
tanks, cisterns) or more complex methods (underground dams) ( Zhu et al, 2004).
RWH can be categorized according the catchment method used as: in-field RWH
(IRWH), ex-field (XRWH) and domestic RWH (DRWH). In IRWH, part or all of the
target area is used as the catchment area. In XRWH the catchment area is separate
from the target area and harvested water is transported through channels to the target
area (Kahinda et al, 2007). In DRWH, rainwater is collected on rooftops or other
compact surfaces and stored in underground (UGTs) or aboveground tanks (AGTs)
for domestic uses and other small-scale activities (Kahinda et al, 2007).
Soumitra Paul, Mahir Asef
11
RWH can also be divided into two major systems: runoff rainwater harvesting and
rooftop rainwater harvesting. In the former system, water collected is of a low quality
as it follows a similar route as surface water in that area (Kahinda et al, 2007) and
thus requires an added effort on treatment of harvested water before domestic use.
Studies show that of the two systems, rooftop rainwater harvesting, RRWH, yields
harvested waters with contaminants in levels acceptable by international drinking
water standards (Kahinda et al, 2007; Zhu et al, 2004) and is thus thought to be a
superior option when considering domestic water supply, in particular potable water.
Components of a typical RRWH system are the catchment (roof area), down pipe and
gutters and storage tank.
RWH has become a popular option for obtaining a relatively clean, accessible water
supply in many areas with limited water supply. Other than as a direct source of water
for human consumption, RWH often serves as an artificial recharge (AR) to
groundwater that has been over exploited (Sundaravadivel, 2007). Lowering of the
water table due to depletion of groundwater can cause environmental problems like
land collapse, loss of vegetation, desertification and soil erosion.
In the case of groundwater pollution, such as episodes of arsenic contamination in
India (Pandey et al, 2003), rainwater can be used to dilute contaminants within the
aquifer (Sundaravadivel, 2007). Using RWH to replenish groundwater is considered
the most cost efficient way of storing rainwater (Sundaravadivel, 2007).
Soumitra Paul, Mahir Asef
12
Albeit RWH is an old tradition, scientific interest in the design and improvement of
these systems recently expanded after open predictions of global water crisis arose.
For this reason, most literature on the topic lightly focuses on past uses and more on
the need to implement RWH within government policy. Some studies discuss the use
of RWH to supplement water supply for agricultural use during dry seasons in parts of
Southeast Asia and Sub-Saharan Africa. Domestic use systems are put in operation in
many countries in Africa, Asia (Sundaravadivel, 2007) and even a few areas in
Eastern Europe and western United States.
Soumitra Paul, Mahir Asef
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2.2 RRWH Potential and Reliability
Research shows that there is still a considerable amount of untapped rainwater
potential in Africa that can be used to supply adequate water to an immense portion of
the population (UNEP, 2008). However, before adopting RRWH systems, it is
important to verify the RWH potential of the area of interest and conclude whether the
conditional parameters produce a satisfactory reliability for water supply.
The RRWH potential of any region depends on the amount of rainfall, the surface
(rooftop) area used to capture the rainwater and surface runoff coefficient (that is, the
proportion of total rainfall that can be captured). The runoff coefficient used depends
on the type of material of the roof surface (Table 2.1). The potential rainwater supply
of the system is usually deduced by the following equation (Tripathy and Pandey,
2005):
S= R x A x Cr (1) where S is the potential rainwater supply in m3, R is the mean
annual rainfall in m, A is the catchment area in m2 and Cr is the runoff coefficient.
RRWH reliability of a system defines its quality of performance and can be
determined through two equations (Liaw and Tsai, 2004):
(1) the volumetric reliability, that is, the total actual amount of rainwater supply over
demand or
(2) the fraction of time that demand can be met:
Re = 1- n/N
Where n is the number of time units (days) when demand exceeds storage while N is
the total number of time units in the time sequence.
Soumitra Paul, Mahir Asef
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Table 2.1: Coefficient of runoff for common roof types (Kumar, 2004).
Roof Type Runoff Coefficient
Galvanized Iron Sheet 0.90
Asbestos Sheet 0.80
Tiled Roof 0.75
Concrete Roof 0.70
In their study, Tripathi and Pandey in the year of 2005 used the equation 1 to calculate
the rooftop rainwater potential for Zura village in Kutch district in Gujarat, India. The
number of households with different roof areas was used to determine the total
rooftop area which was then multiplied by the annual rainfall and runoff coefficient to
obtain the amount of water stored collectively from the pucca houses in the village.
The researchers then divided the stored water supply by the demand (total population
x daily per capita water demand) to determine the amount of time the collected water
could be used (without replenishing) by the village. Tripathi and Pandey concluded
that the RRWH can be used as a source of domestic water supply for similar water
stressed (500 mm of annual rainfall) villages in arid parts of India.
In another study done by M. Dinesh Kumar in the year of 2004 in the city of
Ahmadabad in a semi-arid part of India, the RWH equation was used to determine the
per capita water harvested for 3 different household stocks; independent bungalow, 3-
story apartment and 10-story apartment. Rooftop areas were dependent on the
household stock and the highest, average and lowest precipitation values with once in
6 years probability of occurrence were used to access the feasibility of RWH in low-
Soumitra Paul, Mahir Asef
15
rainfall areas (Kumar, 2004). The study concluded that the physical feasibility of
RWH in urban areas with low rainfall is less than desirable. In addition government
Subsidies for RWH systems were not recommended for areas characterized with
annual rainfall of less than 400 mm.
These two studies considered both the regional variation of RWH and its dependence
on the social demography of the study area. Several other studies (Kumar, 2007;
Pudyastuti, 2006; Thomas, 1998) show that RWH is suitable in areas that receive
above 1200 mm of rainfall to solely sustain domestic demand. However, the study on
Zura village in India shows that even under low rainfall conditions, the number of
households used in harvesting and the population allowed for a satisfactory water
supply through rooftop harvesting, perhaps due to large roof areas and storage volume
(Kumar, 2007). In addition to storage and demand characteristics, poor roofing
structures, high household density and sparsely distributed houses, typical in many
Asian and African countries, are factors that can greatly reduce the practicality of
RWH in low rainfall areas.
Soumitra Paul, Mahir Asef
16
2.3 Adoption of RWH
As a traditional practice, RWH has gained popularity in the formal settings within the
last decade. The practice, that is still used in many tropical islands and semiarid rural
areas (Tripathi and Pandey, 2005), has been introduced more efficiently into urban
areas and in temperate regions as a way to satisfy higher demand or as a water
conservation method. Although literature on this technique is not extensive, current
literature does highlight the main geographical regions that play key roles in the
development and research of RWH.
2.3.1 Asia
RWH has wide spread adoption throughout Asia. India is leading in rainwater capture
for domestic use in Asia where some variants of RWH have been used for over 8000
years (Pandey et al, 2003). In 2001, India was approaching the level of water stress
with 1,820 cubic meters of annual renewable freshwater per capita which is estimated
to decrease to 1,341 cubic meters by 2025 (Tripathi and Pandey, 2005). The Indian
government has created subsidies to encourage the adoption of DRWH to harness the
rainfall and balance out the declining water table in many parts of the country
(Tripathi and Pandey, 2005). RWH is also commonly implemented as a climate
change adaptation strategy (Pandey et al, 2003). Sir Lanka has practiced RWH since
the 5th Century and even with the introduction of piped systems and boreholes, the
RWH option has once again gained popularity this last decade (Ariyananda, 1999).
With about 1,250 mm of annual rainfall (Sri Lanka‟s main source of freshwater),
harvesting rainwater has been an ideal solution. Over the years, growing population,
Soumitra Paul, Mahir Asef
17
urbanization and deforestation have increased the competition for domestic water
supply hence the country has invested in research to improve the RWH technology.
The government of Sri Lanka in collaboration with the World Bank established the
Community Water Supply and Sanitation Project (CWSSP) that provides water
supply and sanitation infrastructure that can be managed by communities
(Ariyananda, 1999). Initially the CWSSP provided these communities with water
supply through shallow wells, house connections and either hand or motorized pump
wells. Rainwater collected was introduced as a solution to the challenge of providing
water supply to the uphill settlements (Ariyananda, 1999).
2.3.2 Other Regions of the World
Outside of Asia some more developed regions are utilizing RWH to provide partial
supply and reduce the high cost of piped water for a variety of activities such as
gardening, aquaculture, nurseries, domestic supply, and livestock farming for example
(Gould, 1999).
Germany is one of the countries investigating the RWH models in urban areas (Gould,
1999). RWH is an economic way of substituting potable piped water with collected
rainwater for low quality uses such as flushing toilets and laundry (Herrmann, 1999).
Although the utilization of rainwater is a relatively recent focus (within the last 20
years), there has been accelerated use of the technology for private and commercial
sectors. The decentralization of water supply has been accepted and in many cases
subsidized by city councils as it reduces storm overflow (Herrmann, 1999). There
have been efforts by local governments to encourage households to capture rainwater
Soumitra Paul, Mahir Asef
18
for domestic use and divert exceeding amounts to recharge groundwater, however
another objective is to control urban flooding and storm water drainage. Several
places in the country have received grants and subsidies to facilitate this movement
(Gould, 1999).
According to Herrmann in 1999, about 100,000 rainwater storage tanks have been
provided for rainwater storage purposes allowing for the storage of over 600,000m3 of
rainwater. The widespread use of RWH in developed countries such as Australia,
USA and New Zealand, is mainly for the purpose of water supply in the rural and
drier regions. In semi- arid and arid Australia, rainwater is collected for use in farming
and domestic activities and more than one million people rely on rainwater as their
solely domestic water supply (Gould, 1999). Large rainwater catchments are utilized
in Western Australia to provide water for livestock farms and small settlements
(Gould, 1999).
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2.3.3 Bangladesh
The recent detection of high level of arsenic concentration in numerous shallow
tubewell water mostly across Bangladesh has caused serious problem for supplying
safe water for drinking and other domestic uses. It is reported that more than 4000
people are suffering from arsenic-related diseases ranging from melanosis to skin
cancer. It has been also reported that about 70 million people are likely to be affected
through probable arsenic contamination of shallow tubewells currently serving as
water points mainly for drinking and cooking purpose. Efforts to develop remedial
solution are still far from making a comprehensive breakthrough. Known arsenic
removal methods work fairly well only under strictly controlled conditions, making
such use impractical at household level. The fate of affected patients in terms of
developing drugs remains even more uncertain. Researchers are, however,
unanimously agreed that the known treatment so far is the immediate cessation from
the use of arsenic-contaminated water and resumption of the use of arsenic-free water.
As arsenic contamination of groundwater becoming widespread, the increasing
awareness of people is enticing them to find a remedial measure. They are looking
forward to an alternative source that is safe, cost-effective, available and acceptable. It
is also evident that though some people recognized rainwater is safe to drink; their
mental preparedness is not adequate to adopt it in their life. However, it is necessary
to popularize the use of rainwater as an alternative source of drinking and cooking
water. Mass awareness building and training programme on the storage procedures
are required. When people will know that a scientific and cheap method is within their
Soumitra Paul, Mahir Asef
20
reach and it is for betterment of their health, it will positively change their attitude and
practice towards multi-uses of rainwater.
Dhaka has a critical water supply problem, one of the worst for a South Asian city.
According to a study by the Institute of Water Modeling based in Bangladesh’s
capital city, its groundwater level is falling by three meters per year. Groundwater has
already receded by fifty meters in the past 40 years, bringing the current level to sixty
meters below ground. The supply-demand gap is approximately 500m liters per day.
The situation is so problematic that in the summer of 2010, the Government of
Bangladesh deployed troops to manage water distribution in Dhaka. Since 1963, the
population of Dhaka has grown by thirteen times. When Bangladesh gained its
independence in 1971, Dhaka faced a growing influx of rural-to-urban migration. The
city expanded into the low-lying marshlands at its borders. Historically, most of
Dhaka’s water supply comes from its two rivers, the Buriganga and the Shitalakkhya.
But as population has increased and industry has expanded, river water has become
contaminated with industrial waste. Today, groundwater is expected to satisfy over
80% of the city’s water supply. Infrastructure in Dhaka is not robust enough to
sufficiently recharge groundwater. In a recent seminar, international NGO Water Aid
and Bangladesh’s Institute of Engineers concluded that rainwater harvesting needs to
be included in establishing the country’s bylaws. In 2008, it was recommended that
40-50% of building premises should remain unpaved and that half of that area should
be under “green” cover to allow for natural recharge of aquifers. The caveat though is
that 65% of Dhaka is already paved and the remaining 35% does not ensure natural
recharge of aquifers because top soil in most of these locales consists of clay.
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Rainwater harvesting, low-cost systems that collect and store rainwater for year-round
use, offers a cost-effective and practical solution to ease Dhaka’s water crisis. It is
estimated that rainwater harvesting (RWH) systems could supply more than 15% of
Dhaka’s requirements. Since 1997, one thousand RWS have been installed in
Bangladesh, mostly in rural areas. The systems’ capacities vary from 500L to 3,200L,
at costs in the range of US$50-150. If RWH is undertaken as a serious investment, it
could help conserve groundwater and recharge the water table. About 150 billion
liters of rainwater could be harvested during the monsoon season alone. Water can be
stored for four to five months without bacterial contamination an important fact given
that 110,000 children in Bangladesh die of waterborne illnesses every year.
There has been precedence of public-private partnerships working to establish RWH
in Bangladesh. In early 2008, Coca-Cola Far East Ltd teamed up with Plan
Bangladesh to install RWS in five primary schools in the Mirpur and Borguna Sadar
areas of the country to ensure potable drinking water for school students. In 2009,
Coca-Cola became involved in a new partnership with UN-Habitat called The Safe
Drinking Water and Sanitation Project. It is a two-year project valued at US$300,000.
The goal is to impact six thousand families by demonstrating RWH and other water
conservation and storage systems. RWH will be set up at twenty schools while
drinking water and sanitation systems will be set up at thirty schools. The
commissioned RWH recharge capacity is projected to be 3.25m liters per year. So
rainwater harvesting is one of the most efficient, available and cheap method for
Bangladesh to adopt for solving the acute problem of safe water.
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CHAPTER 3
METHODOLOGY
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3.1 METHODOLOGY:
The research project is about introducing a “Rainwater Harvesting System” for both
residential and industrial area to develop an “Alternative source of water for
consumptive purpose”. To achieve the research objectives, the methodology of this
research is divided into following parts-
Data Collection Procedure
Data Analysis
Result
The whole “Methodology” of the project can be represented through the
Flow chart below -
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3.1.1 DATA COLLECTION PROCEDURE:
The data collection procedure is the collection of work done to collect and store the
water sample. Data collection includes survey. Small scale RWHS setup,
experimentation, trials and collection and storage of water sample. The steps are
briefly described here.
3.1.1.1 Survey:
In civil engineering surveying or land surveying is the technique, profession, and
science of accurately determining the terrestrial or three-dimensional position of
points and the distances and angles between them. These points are usually on the
surface of the Earth, and they are often used to establish land maps and boundaries for
ownership or governmental purposes. In general language it is the initial visit where
the project or experiment will be taken place. The steps followed in the research
project are categorized and explained below.
3.1.1.1.1 Study Approach:
Bangladesh is categorized as a developing country whose economy is rapidly
growing. Dhaka is the capital of Bangladesh. All the activities regarding any
development is Dhaka centered. As a result for a better and safer living people from
all districts are moving towards Dhaka. This makes Dhaka the most densely populated
mega city of this world. With the growing population and development of Dhaka city,
the demand for water is also increasing. Dhaka WASA is finding it difficult to meet
this exponential demand.
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The statistical data showing the relation between population growth, water demand
and shortfall of water supply is given below the Table-3.1 and Figure-3.1:
Table 3.1: Prediction of population and water demand in Dhaka urban area
Figure 3.1: Showing water demand and supply with growing population
(Source: Dhaka WASA)
Year
Population
(million)
Water
Demand(mld)
Shortfall(mld) with
present water
supply(2200 mld)
2010 12.27 2400 200
2015 14.93 3050 850
2020 18.04 3686 1486
2025 21.63 4419 2219
2030 25.87 5286 3085
Water Demand and Supply
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Currently, with the help of some 546 water-supply pumps, DWASA supplies about 2.2
million cubic meters (MCM) of water a day against city's daily demand of 2.4 MCM.
Only 15% of the water is supplied from the two surface water treatment plants at
Chadnighat and Syedabad. DWASA is dependent on groundwater for the rest 85%
water demand. This is resulting the groundwater to drop by 3 meter every year.
According to the Dhaka Water and Sewerage Authority (WASA), the Ground water
table was at 11.3m below the surface in the 1970s and at 20m in the 1980s. Dhaka's
groundwater table has gone down by 35m in the past 11 years. However, water level
has drastically fallen since 1996.
The continuous dropping of groundwater table over the past 14 years is graphically
shown in Figure-3.2:
Figure 3.2: Groundwater depletion with time (years)
(Source: Dhaka WASA)
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This is mainly because the estimated mean annual recharge for Dhaka city is 300 –
350 MCM, which is much less than the annual abstraction of 700 MCM. After every
few years the pumps has to be relocated or new deeper installation has to be installed.
If this process continues then within few years groundwater depth will not be any
more within pumping depth.
From the past history with the growing demand for water supply was increased which
caused the Deep Tube Well to go from deep to deeper as shown below Table-3.2:
Table 3.2: Historical data of water supply
Year Supply ( MLD ) DTW
1963 130 30
1970 180 47
1980 300 87
1990 510 140
1996 810 216
1997 870 225
1998 930 237
1999 1070 277
2000 1130 308
2001 1220 336
2002 1550 394
2004 1437 382
2005 1460 423
(Source: Dhaka WASA)
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The demand will surely not decrease but due to the shortage of groundwater, supply
will surely decrease. One of the major threats to the city due to declining groundwater
levels is land subsidence, which can be triggered by earthquakes of greater
magnitudes. So, an alternative source of water or a method to recharge groundwater is
of utmost importance in Dhaka city for preserving environmental balance along with
meeting human demand.
3.1.1.1.2 Condition of Rainfall in Dhaka City
Dhaka has a climate. It has a distinct monsoonal season with an average 2075 mm
(1953-2009) of rain every year. Nearly 88% of the annual average rainfall of
1,826 millimeters occurs between May and October. Water logging occurs after 2-
3hrs of continuous raining.
Figure 3.3: Monthly average rainfall of Dhaka
Monthly average rainfall of Dhaka
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3.1.1.1.3 Study Area:
Our study covers the urban areas of Bangladesh, but to carry out the research work
and for setting up RWHS, Tejgaon industrial area of Dhaka city was selected. The
RWHS was setup on the rooftop of Block – C of Ahsanullah University of Science &
Technology. An area about 100 sq ft of the rooftop was used for this purpose.
Figure 3.4: Study Area (AUST, block-c)
(Source: AUST)
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3.1.1.2 Small Scale RWHS:
A small scale RWHS was setup on the roof top of AUST. The setup of the RWHS,
experimentation, trials and sample collection & storage are vital part of the Data
Collection Procedure
3.1.1.2.1 Experimentation:
The experimentation process includes setting up of RWHS, installation process and
cost measurements.
3.1.1.2.1.1 Equipment:
Equipment’s needed to complete the research work are enlisted below-
Gutter: GI sheet made gutter. Dimension of 8ft * 3ft
Bricks: For inclination and support to the gutter
The First Flush Device: To drain the first fault water. It consists of 6in pvc pipe
along with GI elbow and screw cap at the end
Filtration Drum: Plastic made,15 inch in diameter,15 inch in height
Filtration Bed: Consists of four layer,5 cm well graded gravel,5 cm well graded
brick chips,12.5 cm sand, 12.5 cm well graded gravel
Water Storage Drum: Plastic made, Capacity of 30 gallon, dia of 18in,height of 24
inch
Steel Frame: Steel made, 24 in square, height of 49 in
Outlet Key: 1in
Distribution Pipe: 1in
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Aggregate: Sand and Gravels
Cement: white cement; to keep the whole structure stable
This equipment’s may vary with the type of RWHS setup.
3.1.1.2.1.2 Installation Process
The whole project work was done in the month of May and June. Because the
monsoon starts in Bangladesh in the month of May, and generally lasts till September.
The installation process are described below-
Rooftop Water Tank of the university was used to install the GI sheet made gutter
The GI sheet made gutter was used as the catchment area
At first the gutter was placed on the top of the water tank. In order to drain the
rain water through the gutter, two brick made walls were used. A slope of 1/6 was
maintained between the walls. The gutter was tied with the brick walls to give
stability
Rainwater drains through the first flush device to the collection Pipe
The collection pipe opened to the filtration drum
Filtration drum was placed on top of the main storage tank with the help of the
extended frame. In order to prevent the filtered water becoming polluted a plastic
paper was used as a shade from the bottom of the filtration bed to the top of the
storage tank. The filtered water can directly enter the storage tank.
A outlet key was placed, 3 in up from the bottom of the storage tank to collect
water
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The layout of the RWHS is given below
Figure 3.5(a): Layout of the project
Top view
Front view
Steel sheet
Brick wall
Pipe
Filter bed
Storage
Drum
Supportive
Steel Frame
Isometric view
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Figure 3.5(b): RWHS on AUST
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3.1.1.2.1.3 Cost Measurements
The total cost estimation of the RWHS is given below. The costs may vary with the
market price.
The project cost nearly 7000 BDT.
Table 3.3: Cost of equipment’s
Item Price in BDT
Gutter 600
Storage drum 650
Filtration drum 450
Steel Frame 3000
6in dia pipe 70tk/ft
1in ball bulb 350
Outlet key 100
Fast flush device 400
Cement 150
Other cost 1000
TOTAL COST 7000
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3.1.1.2.2 Trials:
Based on the quality, water is termed into two types
Portable water : Physically, chemically, and bacteriologically acceptable
Palatable water: Free from turbidity, color, taste, odor, and moderate temperature.
In a sense it has to be physically acceptable.
Now to ensure these quality in the harvested water, the filter bed which was installed
initially was given trial as if it can provide physically accepted water or not
Trials on Filtration Bed
To ensure that the harvested water from rain is safe for drinking, filtration bed was
installed. Two trials were given too.
1st trial:
In the initial or 1st trial (Figure-c) of filtration bed some problems were detected.
Turbidity was found because of the presence of sand in the water sample. Again the
color of the sample was not clear. To solve those problems, 2nd
trial was given.
2nd
trial:
In the 2nd
trial (Figure-d), course sand was used in the place of fine sand to solve the
turbidity (sand) problem. A pair of thin net was also introduced in the lowest layer
upon the opening of the filter bed. Also well graded layers of stone chips & brick
chips were used instead of gap graded & uniform graded layers in 1st trial.
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In Figure 3.6 different elements of the filter bed and the layout are given-
Gravel
Brick chips
Fine sand
Gravel
Filter Bed (1st Trial) Filter Bed (2nd trial)
Well Grade Gravel
Well Grade Brick chips
Course sand
Well Grade Gravel
Figure 3.6: Components (a,b) &
layout of Filter bed (c,d)
(a) (b)
(c) (d)
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3.1.1.2.3 Sample Collection & Storage:
There are procedure which must be followed while collecting and storing water
sample. In this research the procedures proposed by Minnesota Pollution Control
Agency are followed.
3.1.1.2.3.1 Sampling Procedure
Sample Holding/Travel Time
Samples must be collected as soon as possible. For water samples, the time from
sample collection to initiation of analysis should be no longer than 24 hours. If time
exceeds 30 hours, results for total and faecal coliform analyses are invalid due to
bacterial stress and die-off.
Sample Containers
Water samples for microbiological examination should be collected in sterilizable,
non- reactive, glass (borosilicate) or plastic bottles. Pre-sterilized plastic bags with
or without DE chlorinating agent, available commercially, may be used. (*Plastic
bottles reduce the possibility of breakage during sample transit.)Bottles should be
carefully washed and rinsed, with a final distilled or deionized water rinse.
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Potable Water Samples taken from tap
Taps used for sampling must be free of aerators, strainers, hose attachments,
mixing type faucets and purification devices. Avoid leaky taps.
Always take sample from cold water tap.
Flush tap by running water (to waste) for 2-3 minutes; this will allow for
adequate flushing of the pipe between water main and tap.
If tap appears to be dirty, clean with a sodium hypochlorite solution , then
allow water to run for an additional 2 to 3 minutes to rinse
Aseptic Sampling Procedure
Wash hands prior to sampling.
Remove lid of sample container with one hand. While holding lid with one
hand, fill bottle with other hand.
Some important points on which emphasis should be given are-
Do not adjust water line or water flow rate before taking sample.
Do not rinse bottle prior to sampling.
Be careful not to touch sides or inside lid of bottle to anything. These measures
will prevent sample from becoming contaminated.
Do not overfill sample container. Make sure there is approximately 1 inch of air
space at top of container to allow for adequate shaking prior to analysis.
Soumitra Paul, Mahir Asef
39
Immediately replace lid tightly.
If there is any question as to whether or not a sample has become
contaminated, discard and resample.
Samples should be placed on ice/ice packs during transit to laboratory to
maintain temperature below 10°C.
3.1.1.2.3.2 Collection and Storage of Research Project Sample
The RWHS was completed at the month of July. The rainfall occurred at 23rd
of
July and the sample was collected at the morning of 24th
July maintaining all above
mentioned procedures. The sample was stored in the freezer at 5°C for two days.
An amount of one liter sample water was collected for testing.
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3.1.2 DATA ANALYSIS:
Analysis of data is a process of inspecting, cleaning, transforming, and
modeling data with the goal of highlighting useful information, suggesting
conclusions, and supporting decision making. Data analysis has multiple facets and
approaches, encompassing diverse techniques under a variety of names, in different
business, science, and social science domains. Data analysis is a body of methods that
help to describe facts, detect patterns, develop explanations, and test hypotheses.
In this thesis Data analysis is done in three steps-
Test the quality of sample
Compare sample with standards
Analysis of surveyed data
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41
3.1.2.1 Test the quality of sample:
To ensure the quality of the harvested water, some tests were run on the collected
sample water. The experiments were done in the university’s “Environmental Lab”.
The results are enlisted in the table below
Table 3.4: Harvested Sample Quality
Name
of the test pH Turbidity Co2 TDS Iron
Free
Chloride Conductivity
D-
ionizer
Redox
potential
Experimente
d Value 7.2
0.055
JTU
5
mg/
l
300
mg/l
0.11
mg/
l
1.77
mg/l
24.3
mg/l
0.26
mg/l
288
mg/l
In addition to our research work, the water of the university (AUST), was also tested.
The university uses ground water for all purposes. The test results are -
Table 3.5: University (AUST) Water Sample Quality
Name of the
tests pH Turbidity CO2 Iron Conductivity
D-
ionizer
Redox
potential
Experimented
value 6.77
0.044 JTU
(.85 JTU) 37 mg/l
0.13
mg/l 88.5 mg/l
0.18
mg/l 217 mg/l
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3.1.2.2 Compare Sample Data With Standards:
The primary purpose of the Guidelines for Drinking-water Quality is the protection of
public health. The Guidelines are intended to support the development and
implementation of risk management strategies that will ensure the safety of
drinking-water supplies through the control of hazardous constituents of water.
These strategies may include national or regional standards developed from the
scientific basis provided in the Guidelines. World Health Organization (WHO)
generally sets a limit of standard values of different elements of drinking water.
In developing national drinking-water standards based on these Guidelines, it will be
necessary to take account of a variety of environmental, social, cultural, economic,
dietary and other conditions affecting potential exposure. This may lead to national
standards that differ appreciably from these Guidelines. A programme based on
modest but realistic goals – including fewer water quality parameters of priority health
concern at attainable levels consistent with providing a reasonable degree of public
health protection in terms of reduction of disease or reduced risk of disease within
the population may achieve more than an overambitious one, especially if targets
are upgraded periodically. Like many other countries Bangladesh also has standards
for drinking water too.
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43
The comparison between the BS (Bangladesh Standard) and harvested water sample
and university water sample are enlisted below:
Table 3.6: Comparison with standard values
Name of the Test Bangladesh
Standard
Experimented value
(Harvested Rainwater)
Experimented Value
(University water)
pH 6.5-8.5 7.2 6.77
Turbidity 10 JTU .055 JTU (1.04 FTU) 0.044 JTU (0.85
FTU)
CO2 5 mg/l 37 mg/l
TDS 1000 mg/l 300 mg/l 278 mg
Iron 0.3-1 mg/l 0.11 mg/l 0.13 mg/l
Free Chlorine 1.77 mg/l 1.68 mg/l
Conductivity 24.3 mg/l 88.5 mg/l
D-ionizer 0.26 mg/l 0.18 mg/l
Redox potential 288 mg/l 217 mg/l
3.1.2.3 Analysis of Survey Data & Storage Calculation
For gathering further information on the thesis topics, a survey work was also
performed. The survey was carried out in two companies –
1) ACI Limited
2) Runner Group of Companies
The data collected from the survey were used to calculate the storage capacity of
those companies and also to Cost-Benefit analysis. The university was also considered
for this calculation.
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44
3.1.2.3.1 Storage capacity Calculation
To know the amount of water that can be saved through RWHS is impotent. The
efficiency of the RWHS is also calculated through the storage capacity. The total
storage capacity of AUST, ACI Limited and Runner Group of Companies are given
below -
AUST
Total boundary area = 400,000 sq ft
Total rooftop area = 32,530.5 sq ft
Total free rooftop area = 12,500 sq ft
The volume of the underground reservoir = 15000 cu ft
Considering 1/3 of the reservoir water is used daily in AUST for all consumptive
purpose,
Total daily water consumption of AUST = 37,402gallon (US)
Consumption of AUST during the five month of monsoon
= (37402*30*5)
= 5,610,300 gallon
Total precipitation in Dhaka city,
During the monsoon (May- September) = 5016 mm
(Source: http://www.bmd.gov.bd)
So, the volume of rainfall = 1748 cu meter
Now, Considering 30% of the rooftop can be used for rainwater harvesting,
The amount of water that can be harvested = 461773 US gallon
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Using Runoff coefficient table,
Amount of harvested water = 461773 * 0.8
= 369418.4 gallon
So the percent of water that can be saved = (369418.4 /5,610,300)*100
= 6.5 %
So, using only 30% of the free rooftop area of AUST, an amount of 6.5%
ground water can be saved.
ACI Limited
Total Area = 10,200 sq ft
Total rooftop area = 6000 sq ft
Free rooftop area = 6000 sq ft
Considering 30% of the rooftop can be used for RWHS,
Harvested area = 1800 sq ft
Total precipitation in Dhaka city,
During the monsoon (May- September) = 5016 mm
So, the volume of rainfall using 1800 sq ft of rooftop
= 839 cu meter
= 221640 gallon
Using Runoff coefficient table,
Amount of harvested water = 221640 * 0.8
=177312 gallon
From the survey, daily consumption for all purpose
= 2324 gal
Total consumption in the monsoon = 2324*5*30
= 348,600 gallon
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The percent of water saved = (177312/348600)*100
= 50 %
So, using only 30% of the free rooftop area of ACI Limited, an amount of 50%
ground water can be saved.
Runner Group of Companies
Total Area = 9000 sq ft
Total rooftop area = 9000 sq ft
Free rooftop area = 7000 sq ft
Considering 30% of the rooftop can be used for RWHS,
Harvested area = 2100 sq ft
Total precipitation in Dhaka city,
During the monsoon (May- September) = 5016 mm
So, the volume of rainfall using 2100 sq ft of rooftop
= 979 cu meter
= 258625 gallon
Using Runoff coefficient table,
Amount of harvested water = 109103 * 0.8
= 206900 gallon
From the survey, daily consumption for all purpose
= 1500 gal
Total consumption in the monsoon = 1500*5*30
= 225000 gallon
The percent of water saved = 206900/225000
= 92%
So, using only 30% of the free rooftop area of Runner Group of Companies, an
amount of 92% ground water can be saved.
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47
3.1.2.3.2 Contribution to Groundwater Recharge
If the system can be used for ground water recharge then a significant amount of
water can be recharged.
Total area of Dhaka City = 1528 km2
(Source: www.rrcap.unep.org/reports/soe/dhaka.../2-1dhaka-Introduction.pdf)
Total population of Dhaka City = 20 million
Total Annual Rainwater = Annual rainfall x Area
= 2.1 m x 1528 x 106
= 3208.8 x 106 m
3/yr
Assuming 25% of the total rainwater is used in recharging groundwater.
Total water recharge naturally = 0.25 x 3208.8 x 106
= 802.2 x 106 m
3/yr
Considering 65% of the area of the Dhaka City is covered by concrete as a continuous
roof.
Actual water recharge in Dhaka = .35 x 802.2 x 106
= 280.77 x 106 m
3/yr
= 769,232 liter/day
If half of the covered area can be used for the rain water harvesting and 50% of the
rain water can be recharged,
Additional ground water recharge = 769.23 x 106 x 0.65 x 0.5 x .5 x 0.85
= 106.25 x 106 m
3/yr
= 291,100 liter/day
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3.1.2.3.3 Cost Benefit Analysis
A cost benefit analysis is done to determine how well, or how poorly, a planned action
will turn out. Although a cost benefit analysis can be used for almost anything, it is
most commonly done on financial questions. The cost for water in the monsoon for
AUST, ACI Limited and Runners Group of Companies are analyzed in this part
Price of water = 6.34 taka per 1000 liter
(Source: www.theindependentbd.com/paper-edition/front-page)
ACI Limited
Demand of water during the monsoon = 348,600 gallon
= 1319594 liter
So, the total cost = (1319594/1000)* 6.34
= 8366 tk
As rainwater can serve 50% of the demand
The savings will be = (8366*50)/100
= 4183 taka
Again, one 10 horse power water pump runs 8 hour per day for lifting water from the
ground and to load the overhead water tanks.
Per unit cost in the industrial area = 8 tk
(Source: BPDB)
So cost for raising water in the monsoon = (10*8)*0.746*8*5*30
= 71616 tk
As rainwater can serve 50% of the demand
So, the savings will be = {(71616*50)/100}
= 35818 tk
Now the total savings = 35818+4183
= 40000 tk
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Runners Group of Companies
Demand of water during the monsoon = 198150 gallon
= 750079 liter
So, the total cost = (750079/1000)* 6.34
= 4755 tk
As rainwater can serve 55% of the demand,
The savings will be = (4755*92)/100
= 4375 taka
Again, from the survey it is found that monthly cost for water
= 30000 tk
As rainwater can serve 55% of the demand water
So, the savings will be = {(30000*92)/100}*5
= 138000 tk
Now the total saving = 138000+4375
= 142375 tk
AUST
AUST only uses ground water for all types of consumptive purposes.
Three 9 horse power water pumps run 2 hours per day. 2 of them are used to lift water
from the ground to the main reservoir. And the rest is used to load the overhead water
tank from main reservoir.
So cost for raising water in the monsoon = ((9*3)*2)*0.746*8*5*30
= 48340 tk
(Source: AUST)
As rainwater can serve 3% of the demand water
So, the savings will be = {(48340*6.5)/100}*5
= 15710 tk
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Expances during the monsoon (tk) Savings during the monsoon (tk)
48340
15710
75800
40000
154755 142375
Costs-Benefits Analysis
AUST ACI Limited Runners Group of Companies
Figure 3.7: Comparison of Costs-Benefits Analysis
In the research project the adoption of RWHS largely depends on the cost-benefit of
the total system. Analysis shows that RWHS is more economical during the monsoon
than of ground water pumping.
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7.2 6.77
7.5
pH Experimented value (Harvested Rainwater)
Experimented Value (University water)
Bangladesh Standard
3.1.3 RESULT
The results section is organized to show how the dates’ are tested; comment on the
research question or hypothesis should also be presented. If the harvested rainwater is
safe for drinking purpose or not, does it meets the Bangladesh Standard water quality,
if it is cost beneficial or not these topics are discussed here.
3.1.3.1 Water Sample Quality
The water quality of the harvested rainwater was tested in the Environmental
Laboratory of AUST. The report collected from the laboratory is arranged in table 3.6.
The comparison of the parameters with BS guideline, whether harvested water is
acceptable as drinking purpose or not are discussed below.
pH
In general, water with a pH < 7 is considered acidic and with a pH > 7 is considered
basic. The normal range for pH in surface water systems is 6.5 to 8.5 and for
groundwater systems 6 to 8.5. Alkalinity is a measure, of the capacity of the water to
resist a change in pH that would tend to make the water more acidic. From the
laboratory test, pH value of the harvested water was found 7.2, which is well inside
the BS. On the other hand the university water pH was found to be 6.77, which is very
slightly acidic. So in the case of pH, the harvested water quality is ok.
Figure 3.8: Comparison of pH
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10
0.055 0.044
Turbidity (JTU)
Bangladesh Standard
Experimented value (Harvested Rainwater)
Experimented Value (University water)
Turbidity
Turbidity is the suspended matter which can be removed from water through
filtration. On the other hand, is a measure of the amount of light scattered and
absorbed by water because of the suspended matter in the water. Turbidity is the lack
of clarity or brilliance in water. Water may have a great deal of color, and still be clear
and without suspended matter. BS for turbidity is 10 JTU. The harvested water was
found 0.055 JTU from the test. The value is found to be 0.044 JTU from the
university water. So the harvested water is acceptable in the turbidity standards.
Figure 3.9 Comparison of Turbidity (JTU)
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0.65
0.11 0.13
Iron (mg/l)
Experimented value (Harvested Rainwater)
Experimented Value (University water)
Bangladesh Standard
TDS
TDS is defined as the combined content of all inorganic and organic substances
contained in a liquid that are present in a molecular, ionized or micro-granular
suspended form. According to the Bangladesh standard guide line total dissolved solid
in water must be <1000. From the experiment harvested water TDS value was found
300 mg/l. So the TDS of the sample water is acceptable.
Figure 3.10: Comparison of TDS (mg/l)
Iron
According to the Bangladesh standard iron in the water sample ranges between 0.3-1
mg/l. The amount of Iron found in the sample water was 0.11 mg/l, which is slight
low than the BS. So it can be said alright because in the university water it has been
found 0.13 mg/l.
Figure 3.11: Comparison of Iron (mg/l)
1000
300 278
TDS (mg/l)
Experimented value (Harvested Rainwater)Experimented Value (University water)Bangladesh Standard
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Other Properties
Some other properties of water were also examined. The properties are- CO2, Free
Chlorine, Conductivity, D-ionizer and Redox potential. As Bangladesh Standard does
not provide too much importance in these properties for drinking water, so there is no
such strict limit for these properties. But these properties were found to be in the close
range to the university water.
Comment
The harvested rainwater properties were found acceptable for drinking and other
purpose from the view of pH, Turbidity, TDS and Iron. The color of the sample water
was also found acceptable. But only these properties are not enough to say that it is
safe for drinking purpose. For other purpose it can be accepted. Some important
properties such as Fecal Coliform, Hardness, Sulphate, Carbonate, Nitrate were failed
to be tested because of the limitation of facilities in the laboratory. So without running
these tests the harvested water cannot be used for drinking purpose.
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3.1.3.2 Storage Capacity Comparison
In rainwater harvesting, calculation of supply and demand of water is very important.
Storage is the difference between actual supply of fresh water and the demand. The
amount of water that can be saved through harvesting are enlisted in Table 3.7
Table 3.7: Storage Comparison between AUST, ACI limited and Runners Group of
Companies
AUST ACI
Limited
Runner Group
of Companies
Total boundary area 400,000 sq ft 10,200 sq ft 9000 sqft
Total rooftop area 32,530.5 sq ft 6000 sq ft 9000 sq ft
Total free rooftop area 12,500 sq ft 6000 sq ft 7000 sq ft
Total daily water consumption 37,402gallon (US) 2324 gal 1321 gal
Consumption during the five
month of monsoon 5,610,300 gallon
348,600
gallon 198150 gallon
Considering 30% of the rooftop
the amount of water that can be
harvested
369418.4 gallon 177312
gallon 206900 gallon
Total Savings 6.5% 50% 92%
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Total
boundary
area
(sq. ft)
Total rooftop
area
(sq. ft)
Total free
rooftop area
( sq ft)
Total daily
water
consumption
(gallon (US))
Consumption
during the
five month of
monsoon
( gallon)
Considering
30% of the
rooftop the
amount of
water that can
be harvested
( gallon)
Total Savings
(percentage)
400,000
32,530.50
12,500
37,402 5,610,300
369418.4
6.5
10,200
6000
6000
2324 348,600
177312
50
9000
9000 7000
1321 198150
206900
92
Comparison of between AUST, ACI limited and Runners
Group of Companies
AUST ACI Limited Runner Group of Companies
Figure 3.12: Comparison of between AUST, ACI limited and Runners Group of
Companies
Comment
In the research, for calculating storage capacity only 30% of the free rooftop of the
buildings was considered. From table 3.7 it can be said that in the months of monsoon
AUST, ACI Limited and Runners group of Companies can save up to 6.5%, 50% and
92% respectively. In this case it should be mentioned that the data used for calculation
were collected from a survey carried out to those places.
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3.1.3.3 Statistical Analysis:
Statistical analysis means collection, examination, summarization, manipulation, and
interpretation of quantitative data to discover its underlying cause’s patterns,
relationships, and trends. Statistical analysis refers to a collection of methods used to
process large amounts of data and report overall trends. Statistical analysis is
particularly useful when dealing with noisy data. In the research work the samples of
harvested rainwater and the water used in AUST are compared with the Bangladesh
Standard. Statistical analysis is performed to correlate between the sample properties.
The samples were analyzed through one sample t test and pair sample t test. The
results gained through the analysis may not be too much significant because only two
samples were used to run these tests.
Table 3.8: One-Sample Test
Sample
Test Value = 0
t df Sig. (2-tailed) Mean Difference
Bangladesh Standard 1.026 3 .380 254.8750
University (AUST) Water Sample Quality 1.642 6 .152 49.9462857
Harvested Sample Quality 1.639 8 .140 69.6327778
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Table 3.9: Paired Samples Correlations
Sample N Correlatio
n Sig.
Pair
1
Bangladesh Standard & University (AUST) Water Sample
Quality 3 .349 .773
Pair
2 Bangladesh Standard & Harvested Sample Quality 4 1.000 .000
Pair
3
University (AUST) Water Sample Quality & Harvested
Sample Quality 7 .943 .001
Table 3.10: Paired Samples Test
Sample Sig. (2-tailed)
Pair
1 Bangladesh Standard - University (AUST) Water Sample Quality .285
Pair
2 Bangladesh Standard - Harvested Sample Quality .382
Pair
3 University (AUST) Water Sample Quality - Harvested Sample Quality .828
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Bangladesh
Standard &
University (AUST)
Water
Sample …
Bangladesh
Standard &
Harvested Sample
Quality,
1.000
University
(AUST)
Water Sample
Quality &
Harvested …
Paired Samples Correlations
Correlation
Bangladesh
Standard,
0.38
University
(AUST)
Water Sample
Quality,
0.152
Harvested
Sample
Quality, 0.14
One Sample t Test
Significance
Comment:
From the statistical analysis some decisions can be made, which are-
In Table 3.8 where significances are found from one sample t test, it can be seen that
the significances have decreased. It means singular data cannot represent much
significance all alone.
Figure 3.13: One sample t test
From table 3.9 in which pair sample test have been performed, the correlations
between the samples have much improved. The correlation is found to be 1 in case of
BS and harvested rainwater, which means the sample qualities are the same or does
not differ by much. It is also close to one in case of AUST and Harvested rainwater,
but decreased between BS and AUST samples.
Figure 3.14: Paired Sample Correlation
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Bangladesh
Standard
University
(AUST)Water
Sample
Quality
Harvested
SampleQuality
Bangladesh
Standard -University
(AUST)
WaterSample
Quality
Bangladesh
Standard -Harvested
Sample
Quality
University
(AUST)Water
Sample
Quality -Harvested
Sample
Quality
0.38
0.152 0.14
0.285 0.382
0.828 Comparison of Significance
Significance (one)
When Table 3.8 and 3.10 are considered it is seen that, the result of significances
between pair sample and one sample t test the significances have varied. The
significances have improved in case of pair sample test than of one sample test. It
means the samples have much similar qualities when they are tested in a group than of
singular.
Figure 3.15: Comparison of Significance (One & Paired Sample)
From Table 3.8 and 3.9 it is seen that, in the case of pair sample test the correlations
between the samples are more improved than that of one sample t test. The values
have deviated a bit when the samples were compared with the BS. It’s because BS
does not provide all standards for water samples which were tested in the laboratory.
So, from the above it can be said that, the results gained from the statistical analysis
are seen to be scattered. It is because of the limitation of collected samples. To get a
stable result or decision more samples are required.
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CHAPTER 4 GIS PRESENTATION
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Divisional Rainfall Intensity of Bangladesh
(Source: http://www.bmd.gov.bd)
DHAKA
5016mm
SYLHET 4136
CHITTAGONG
22976
BARISAL
4920
KHULNA
4227
RAJSHAHI +
RANGPUR
8414
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0
10000
20000
30000
40000
50000
60000
70000
80000
198
01
98
11
98
21
98
31
98
41
98
51
98
61
98
71
98
81
98
91
99
01
99
11
99
21
99
31
99
41
99
51
99
61
99
71
99
81
99
92
00
02
00
12
00
22
00
32
00
42
00
52
00
62
00
72
00
82
00
92
01
02
01
1
RA
INF
AL
L I
NT
EN
SIT
Y (
mm
)
Rainfall Intensity in Monsoon For Division
DHAKA RAJSHAHI RANGPUR
KHULNA BARISAL SYLHET
(Source: http://www.bmd.gov.bd)
(Source: http://www.bmd.gov.bd)
Figure 4.1: Rainfall Intensity
0
10000
20000
30000
40000
50000
60000
70000
80000
1975 1980 1985 1990 1995 2000 2005 2010 2015
MO
NS
OO
N (
mm
)
YEAR
Rainfall Intensity in Monsoon For Bangladesh
Monsoon
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Total
boundary area(sq. ft)
Total rooftop
area(sq. ft)
Total free
rooftop area( sq ft)
Total daily
waterconsumption
(gallon (US))
Consumption
during the fivemonth of
monsoon
( gallon)
Considering
30% of therooftop the
amount of
water that canbe harvested
( gallon)
Total Savings
(percentage)
400,000
32,530.50
12,500
37,402 5,610,300
369418.4
6.5
10,200
6000
6000
2324 348,600
177312
50
9000
9000 7000
1321 198150
206900
92
Summarised Information
AUST ACI Limited Runner Group of Companies
Figure 4.2: Summarized Information Comparing the Study Areas
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CHAPTER 5 CONCLUSION
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5.1 CONCLUSION
The current water availability and supply condition of Dhaka city is very vulnerable
which will deteriorate in future. This is alarming for both government and private
sector, and this crisis will question the survival of mankind at some point of time in
future. So dependency on groundwater has to be decreased and the possibility of
surface water treatment plant for Dhaka City is also not that bright. So right now the
only and most potential alternative is Rainwater Harvesting. This will meet the water
demand of the community during severe crisis. The installation of Rainwater
Harvesting will increase only 0.5% of the cost of the building which is very much
affordable as water is one of few important elements for human survival whose
availability is of more importance than its cost. Rainwater Harvesting will recharge
108 MCM per year which is equal to 31% of the deficit Dhaka faces every year. This
also increases the sustainability of groundwater by recharging it. So, for the sake of
our survival in Dhaka, a revolution of rainwater harvesting has to be adapted which
will involve all the roofs of the city catching water in every possible way.
In this research the detailed study was done on AUST. The small scale RWHS was
setup on the rooftop of AUST. Again for determining the present water supply-
demand situation a survey was also carried out on ACI Limited and Runners group of
companies. The storage capacity, cost-benefit analysis was also performed to justify
the importance of Rainwater Harvesting in Dhaka City. The statistical analysis shows
the correlations between the water collection sources and water qualities. Here Dhaka
City represents all the urban areas of Bangladesh. And for all areas of Bangladesh
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both urban and rural, it can be said that, Rainwater Harvesting is the most efficient,
economical and environmental friendly source of alternative water.
5.2 MAJOR FINDING of THE STUDY
The research highlights on establishing Rainwater Harvesting as an alternate source of
water. Through this research work some major aspects were revealed. The decisions
that came through this research work are-
Rainwater Harvesting can be an alternative source of drinking water.
Industries can adopt Rooftop RWHS.
Rainwater harvesting is more economical than of ground water pumping
Proper treatments are to be applied before using rainwater for consumptive
purpose.
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5.3 FUTURE SCOPE of STUDY
Due to lack of time and facilities some assessment was not done, which is kept for
future study
Although data from primary sources were used for this study to assess the
portability of rainwater, but no research was done on the volume of First Flush
with respect to intensity of rainfall, location and time. Determination of an
effective First Flush volume will definitely increase the credibility of rainwater to
be chosen as an alternative technology.
The sample used for tests was collected only once from the small scale RWHS.
More samples collected on different dates will be more helpful to judge the water
quality.
Only two companies were selected for this research, if more consumers can be
taken into consideration then there is a better chance of collecting satisfactory
number of data to run statistical analysis and to get a significant result.
There is good possibility of generating electricity by using RWHS, which will be
the combination of rainwater harvesting and green energy.
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References:
1. World Bank,(2001), URL
http://web.worldbank.org/external/projects/main?pagePK=104231&piPK=732
30&theSitePK=40941&menuPK=228424&Projectid=P050745, access on:
March, 2012
2. Hussain & Ziauddin, (1989), Rainwater harvesting for application in
rural Bangladesh, URL
www.bfjbrochez.be/.../Lee%20and%20Visscher%20Rainwater.pdf
3. Al-Muyeed and M. Habibur Rahman, Arsenic crisis of Bangladesh and
mitigation measures, URL
http://www.iwaponline.com/jws/058/jws0580228.htm
4. Smith, Lingas and Rahman, (2000), Arsenic: An Abundant Natural Poison,
URL
www.csa.com/discoveryguides/arsenic/review.pdf
5. Hussain & Ziauddin, (1989), Rainwater harvesting for application in rural
Bangladesh, URL
www.bfjbrochez.be/.../Lee%20and%20Visscher%20Rainwater.pdf
6. Han A. Heijnen, Environmental Health Advisor, Towards Water Quality
Guidance for Collected Rainwater, URL
www.eng.warwick.ac.uk/ircsa/abs/10th/3_02.html
7. Mbilinyi, (2005), Water Harvesting, An Overview, URL
www.awiru.co.za/pdf/_WaterHarvestingWorkingPaper3.pdf
Soumitra Paul, Mahir Asef
71
8. Babu and Simon, (2006), Assessing the reliability of roof top rainwater
harvesting, URL
www.geography.siu.edu/pdfFiles/Graduate/GradPapers/Mundia.pdf
9. Zhu et al, (2004), Rainwater harvesting, quality assessment and utilization in
Kefalonia Island, Greece, URL
http://www.sciencedirect.com/science/article/pii/S0043135407000759
10. Kahinda et al, (2007), A GIS-based decision support system for rainwater
harvesting, URL
http://www.sciencedirect.com/science/article/pii/S1474706509000606
11. Sundaravadivel, (2007), Rainwater harvesting for recharging shallow
groundwater, URL
http://www.wateraid.org/documents/plugin_documents/wa_nep_report_rwh_2
6_september_2011.pdf
12. Tripathy and Pandey, (2005), Study of rainwater harvesting potential of Zura
village of Kutch District of Gujarat, URL
http://www.krepublishers.com/02-Journals/JHE/JHE-18-0-000-000-2005-
Web/JHE-18-1-000-000-2005-Abst-PDF/JHE-18-1-063-067-2005-1280-
Tripathi-A-K/JHE-18-1-063-067-2005-1280-Tripathi-A-K-Full-Text.pdf
13. Kumar, (2004), Roof Water Harvesting for Domestic Water Security, URL
http://www.tandfonline.com/doi/abs/10.1080/02508060408691747
14. Pandey et al, (2003), Harvesting Rainwater for Environment, Conservation &
Education, URL
iwahq.org/Content Suite/upload/iwa/.../session%20a%2004.pdf
Soumitra Paul, Mahir Asef
72
15. Ariyananda, (1999), Quality of Collected Rainwater from Sri Lanka, URL
www.lankarainwater.org/pubs/papers/qocrwfsl2001.pdf
16. Gould, (1999), Rainwater Harvesting in Southern Africa, URL
http://www.lboro.ac.uk/well/resources/fact-sheets/fact-sheets-
htm/RSA%20Rainwater%20in%20SA.htm
17. Herrmann, (1999), Harvesting Rainwater for Environment, Conservation &
Education, URL
iwahq.org/Content Suite/upload/iwa/.../session%20a%2004.pdf
18. Dhaka WASA, URL
www.dwasa.org.bd, access on: March, 2012
19. AUST, Engineering Section
Access on: May, 2011
20. Bangladesh Meteorological Department, (2011), URL
http://www.bmd.gov.bd/Monsoon_rain/Monsoon_rain.html, access on: March
2012
21. The independent, Rising cost of water for Dhaka City, URL
http://theindependentbd.com/paper-edition/editorial/editorial/43717-rising-
cost-of-water-for-dhaka-city.html, access on: March, 2012
Soumitra Paul, Mahir Asef
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APPENDIX
Soumitra Paul, Mahir Asef
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Questionnaire
Ahsanullah University of Science and Technology
Data Collection Sheet on
INVESTIGATION OF UTILIZING RAINWATER AS ALTERNATE SOURCE
OF WATER IN TEJGAON INDUSTRIAL AREA
Name of the Company
Address
GIS Co-ordinates
Informers Name
Designation
Total No of Users
Amount of Water Used (Drinking Purpose)
Maxm : Min
m :
Amount of Water Used (Industrial purpose)
Maxm : Min
m :
Total No of Wash Rooms
Daily/Monthly Expense of Water (Drinking Purpose)
Maxm : Min
m :
Daily/Monthly Expense of Water (Industrial Purpose)
Maxm :
Minm :
Electricity Used For Water Purpose
Maxm : Min
m :
Roof Top Areas of the Company
Total : Useable :
APPENDIX-1
Soumitra Paul, Mahir Asef
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Soumitra Paul, Mahir Asef