Full Report 12Oct

8/3/2019 Full Report 12Oct

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~ CASE STUDY ~Projek Menaiktaraf Sistem Saliran Bagi Mengatasi Masalah Banjir di Kawasan Selayang, Mukim Batu, Daerah

Gombak,Selangor Darul Ehsan.

CHAPTER 1 : INTRODUCTION

1.1 Background of Study

Due to the requirements and frequent flood reported at surrounding area of Jalan 40,

Jalan 30, Jalan 29, Jalan 28, Jalan 26, Jalan Indah 15, 16, 17 & 20, part of the area around

Kg. Selayang Baru, Kg. Selayang Indah, Kg. Selayang Pandang and along Anak SungaiJinjang from confluence to Sungai Jinjang, a study on the flood mitigation was carried

out. Subsequently, to determine and recommend to Jabatan Pengairan Dan Saliran

Selangor various structural flood mitigation measures such as drains / streams capacityimprovement up to detailed design.

1.2 Objectives

The objectives of this project are: -

a) To upgrade the existing drainage system wherever possible in order to reduce or

minimize flood problem. b) To alleviate current flood condition in surrounding kampung areas and

downstream.

1.3 Scope of Works

The main scope of works of the project includes the following:-

a) To identify affected stretches of river bank or drain/stream along Anak Sungai

Jinjang along Jalan 30, Jalan 29, Jalan 28, Jalan 27 & Jalan 26 which are subjected toerosion, collapse of existing rubble wall drain and upgrading the natural earth drain

system.

b) To collect additional data and information required for the detailed designs of the

works, which are to be carried out in next stage. The required data and information

are as follows: -

Hydrological analysis to estimate major and minor storm runoff for the drainagesystem is carried out.

Hydraulic analysis is undertaken to establish flow profiles.

Prepare a program for all necessary engineering surveys and geotechnical

investigation.

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c) To propose feasible flood mitigation and drainage improvement works for immediateimplementation to improve or to minimize the study area from flooding. The

improvement and minimizing works include the following: -

Carry out detailed design of the flood mitigation works, upgrading of the existingdrains / streams and any other drain required as well as the relevant drainage

structures for the efficient functioning of the system.

Detailed planning and design of flood mitigations works and structures shall be

compatible with JPS standard practices, best suited to site conditions, economical

to construct and easy to operate and maintain.

The study area covers a length of approximately 1,500.00m of Anak Sungai Jinjang along

Jalan 30, Jalan 28, Jalan 27 and Jalan 26 from confluence to the existing twin box

culvert, (Plate 30 & 31) and the surrounding area. The study area is illustrated in Figure

1 and Figure 2.

1.4 Area of Concerned

(i) To identify affected stretches of river bank/drain/stream along Anak Sungai

Jinjang Jalan 26 and to come up with appropriate new U-shape drain system.

(ii) To identify the bottle neck area at the existing round pipe culvert crossing Jalan29. The location is between Jalan 26 and Jalan 27 (Figure 4, 5 & 6).

(iii) To identify affected stretches of existing rubble wall (Figure 10, 11, 19, 28, 29

& 30) along Anak Sungai Jinjang Jalan 26 and the existing natural earth drain(Plate 21, 24 & 25).

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Figure1.1:KeyPlanofTheS

tudyArea

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Figure 1.2 : Location Plan of The Study A


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CHAPTER 2 : EXISTING CONDITIONS AND FLOOD PRONE AREAS

2.1 The Study Area

The Study Area is about 1,500.00m long Anak Sungai Jinjang from confluence of

existing twin box culvert (Plate 30 & 31) located at Kampung Selayang Indah in the

municipal of Majlis Perbandaran Selayang.

Based on the observation during the site reconnaissance on 11 March 2009, 12 April

2008 and 22 March 2008, it was found that most the Study Area is within the vicinity ofthe existing housing and commercial buildings area.

The existing two round pipe culvert crossing Jalan 29, near Jalan 26 and Jalan 27 hasbeen identified as a critical area contributing to the flooding during heavy rains. The

section of existing two pipe culverts is inadequate to discharge water from drain/streamalong Jalan 30 during or after heavy rain (Figure 1 & 2).

Part of the existing rubble wall has been collapsed need to be reconstructed or replaced

with U-shape drain along Jalan 26. Some stretches are originally earth drain. (Figure 3 &

4).

2.2 Problems Encountered at Study Area

From the site reconnaissance conducted on 22 March 2008, 12 April 2008, 10 & 11

March 2009 and discussion with JPS Gombak on 11 March 2009, following are some of

the problems encountered and flood prone area along the Study Area.

(i) Flooding at Jalan 29, caused by existing two pipe culverts (Figure 1 & 2).

(ii) Collapse of existing rubble wall along Jalan 26 (Figure 3 & 4)

(iii) Access problem for some stretches along Jalan 28 (Plate 23, 24 & 25)(iv) The existing brickwall fence constructed on drain reserved land (Plate 25, 27 & 30).

2.3 Existing Site Condition

2.3.1 Flooding caused by Two Pipe Culvert Road Crossing at Jalan 29

The Study Area are surrounding with an existing housing scheme and commercialbuildings. The existing old monsoon drain along Jalan 30 & Jalan 40 located in

between commercial building and housings are seen not having any problem to

flow the water(Figure 1 & 2).

Under normal conditions, these two round pipe culverts are seen not having any

problem to discharge water from the upstream old monsoon drain and not causedany flooding problems.

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We were informed that the flood occurs during or after heavy rain where the pipe

section is inadequate to discharge water (Figure 1 & 2). The flow capacity

increasingly and caused water overflowing to surrounding area of Jalan 29, Jalan

27 and Jalan 26.

2.3.2 Collapse of existing rubble wall drain and erosion along Jalan 26

A part of the existing drain/stream at this area is still natural earth section with

grass cover and at several locations along the drain/stream especially at turning

area where the drain/stream is subject to frequent scouring effect, the earth sectionis seen undergoing river bank erosion and slope failures is indicated in Figure 3& 4. The failed slope is still not protected and may experience further erosion and

slope failure in future.

The slope protection has been partly displaced and seen scattered around thedrain/stream bed with plenty of rubbish seen trapped in between the collapsed anddisplaced panel which will cause constriction to the flow.

2.3.3 Access problem for some stretches along Jalan 28

There is no access to the some fetches area (Plate 24 & 25). The drain/stream

flows exactly in between of the existing two brickwall fence. The existing

drain/stream at this area is still natural earth section with grass cover (Plate 23, 24& 25) and at several locations along the drain/stream especially at turning area

where the drain/stream is subject to frequent scouring effect (Plate 24), the earth

section is seen undergoing river bank erosion (Plate 19 & 21).

2.3.4 Existing brickwall fence built on drain / stream reserved land

Brickwall fence was constructed along some fetches (Plate 23,24,25,27 & 31)adjacent to the existing twin box culvert (Plate 30) and plantation nursery is

located within drain reserved area (Plate 30).

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CHAPTER 3 : DATA COLLECTION AND ADDITIONAL INFORMATION REQUIRED

3.1 Data and Reports Collected

The main source of data and reports for this study area are obtained and furnished by JPSGombak, Majlis Perbandaran Selayang (MPS), and bought from Jabatan Ukur dan

Pemetaan Negeri Selangor, Shah Alam. The data and reports collected for the Study Area

include the following:

(i) Pelan Susunatur dan Tanda Nama Jalan, by Jabatan Perancang Bandar, nMajlis

Perbandaran Selayang(MPS).(ii) Syit Piawai 69D, Daerah Gombak, Mukim Batu, Mukim Bandar Selayang.

(iii) Syit Piawai 77B, Daerah Gombak, Bandar Selayang.(iv)Preliminary Survey Plan provided by the previous contractor.

3.2 Additional Information Required

Additional data and information required for the stage of design, such as:

(i) Survey plan

Detailed topographical survey and cross section along Anak Sungai Udang, Anak

Sungai Jinjang is required to determine the extent of channelisation being

constructed and how the channelisation section affects Anak Sungai Jinjang alongJalan 26 towards the existing twin box culvert. This information shall be provided

by JPS Gombak or a licensed surveyor, who will be appointed by JPS Selangor.

(ii) Detailed Cross-Section for existing pipe culvert at Jalan 29

Details of cross-section shall show level, size and construction materials of two

nos. of the existing pipe culvert. This information shall be provided by JPS

Gombak or a licensed surveyor, who will be appointed by JPS Selangor.

(iii) Detail Cross-Section of existing Twin Box Culvert

Details of cross-section shall show level, size and construction materials of the

existing twin box culvert. This information shall be provided by JPS Gombak or alicensed surveyor, who will be appointed by JPS Selangor.

(iv) Soil Investigation Report

Soil Investigation is required to be carried out to determine the soil properties for

detailed design of new road crossing box culvert, channelization area and slope

protection works. The works shall be carried out by the soil investigationcontractor to be appointed by JPS Selangor. If available, the previous Soil

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Investigation Report within the study area shall be helpful or sufficient to obtainthe data.

(v) Previous Topographical Survey of Sungai Udang and Sungai Jinjang

To determine the existing drainage system and the siltation condition due to theurbanisation of the surrounding catchments area, by comparing with the current

survey information.

(vi) Majlis Perbandaran Selayang, MPS.Master plan development for areas along Anak Sungai Udang and Anak Sungai

Jinjang is required to check the extent of development taking place within thecatchment area. Storm management report for development area is essential

information for detailed design.

(vii) Concurrence of Design Parameter

JPSs concurrent is required on the following design parameters or assumptions tobe adopted for the detailed design:

(i) Catchments area to be adopted either pre-development or post-

development or certain percentage to be considered for the post

development due to possible error or flood detention ponds not properlyfunction within relevant development area.

(ii) Design ARI to be adopted for the proposed channelization section andproposed river improvement to the existing Anak Sungai Jinjang.

(iii) Free board to be adopted for the existing bridge crossing (Plate 27).

(iv) Catchments area is obtained from available topographical map assuming

the surface runoff remains unchanged by the urbanization.

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CHAPTER 4 : PRE-CONSTRUCTION STAGE

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Figure 1 : Existing 2 nos. of pipe culvert

crossing the road (Jalan 29) identified as abottle neck area during/after heavy rain.

Proposed new box culvert to replace pipe

culvert to alleviate the flow of water.

Figure 2 : Existing drainage system under the

normal weather condition. View from Jalan29.


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Figure 3 : Part of existing concrete structure

and drain wall collapsed. View from Gerai

MPSarea.

Figure 4 : Part of existing concrete structure

collapsed. View from back side of Gerai MPS.

Figure 5 : View from top of existing twin box

culvert (2.30m x 2.30m). Plantation nursery

(left) and brickwall constructed adjacent to

rubble wall drain (right).

Figure 6 : Existing rubble wall drain.


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Figure 8 : View of the existing twin box

culvert (2.30m x 2.30m).



CHAPTER 5 : DURING CONSTRUCTION STAGE

Figure 9 : Materials on site.

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Figure 7 : Existing steel structure bridge.


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Figure 10 : Machineries at site.

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Figure 11 : Constraints at the site. No access and the adjacent building/structures is to close to the drain.

Figure 12 : Protection works at the site.

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Figure 13 : Installation of precast U-shape Monsoon drain.

Figure 14 : Installation of Rip Rap and Gabions.

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Figure 15 : Waste control and management.

CHAPTER 6 : AFTER CONSTRUCTION STAGE

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Figure16 : Overall View of the new U-shape Monsoon Drain size 3000 x 2700

Figure 17 : View at CH762.50 Pasar Borong area.

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Figure 18 : View of the new U-shape Monsoon Drain size 3000 x 1500

Figure 19 : View at CH1150.00 CH1450.00. Need maintenance works.

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CHAPTER 7 : CONCLUSION

The proposed feasible flood mitigation and drainage improvement works for immediate

implementation to improve the study area from flooding is mainly to control flood at sourcepoint before discharging through the existing twin box culvert at CH762.50 to Sungai Jinjang.

Replacement of the existing two pipe culvert crossing Jalan 29 with bigger and suitable section,

proposed 3000W x 2000H box culvert however cannot be carried out due to additional costapproximately RM1.2 million to relocate the existing TM fibre optic cables crossing the road.

Additional scope of works by providing gabion, riprap and hand railing along CH1150.00 toCH1450.00 may also improve the area.

Options to channelize part of the river section along CH00.00 to CH500.00 have been carried outat site. By providing free flow from the upstream may minimize or reduce the flood problems.

Part of the existing rubble wall drain which still in good conditions have been maintained (Plate26, 27, 28, 29 & 30). Make good and repair works have been carried out to the affected stretches.

On top of that, a safety measures have been carried out by installing galvanized hand railing

along the drain. Two reinforced concrete pedestrian bridges located at CH50.00 and CH150.00

have been constructed in order to give access for the public to cross the drain.

Increasing the frequency of desilting work to the existing drain/stream especially along

CH700.00 to CH762.50 should be also adopted by JPS Selangor due to rapid development withinthe Study Area catchments area.

Another big task for JPS Selangor is to educate the public not to use the drain as a dumping area,not to throw any wastages, rubbish or debris direct to the drain. Changes in attitude and mentality

may contribute to better conditions of the drain. It also preserves the fish habitat and may

minimize maintenance cost for clearing and cleaning the drain.

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APPENDIXES

PLATE 1

Junction between Jalan 30 (left) and Jalan 29 (main road)

PLATE 2

Existing Guardrail and old monsoon drain in between shoplots. Existing 2 nos. of pipe culvert

crossing the road (Jalan 29) were laid underneath and discharge to Anak Sungai Jinjang(along Jalan 26)

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(i) Old Monsoon drain. No drain reserved. (ii) Old monsoon drain (View from Jalan 29)

(iii) Existing U-shaped drain with partial slab cover (iv) Existing U-shaped drain

(v) Toward upstream of Existing U-shaped drain (vi) Water f low toward pipe culvert crossing Jalan 29

PLATE 3

Existing Old Monsoon Drain (i & ii) and U-shaped Drain (iii vi) along Jalan 30.

Water flow from this drain will go to r.c pipe culvert crossing Jalan 29.

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PLATE 4

Existing 2 nos. of pipe culvert crossing the road (Jalan 29) identified as a bottle neck area

during/after heavy rain. Proposed new box culvert to replace the pipe culvert to alleviate the

flow of water.

(i)Road side drain along

Jalan 29 joining to

Anak Sungai Jinjang

(ii) Anak Sungai Jinjang (CH+00.00)

PLATE 5

Existing drainage system under normal weather conditions. View from Jalan 29.

(Proposed new precast U-shape drain, CH+00.00)

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PLATE 6

View from Jalan 29 during raining time.

PLATE 7

View frow Jalan 29. Jalan 27 is located on the left and Jalan 26 is on the right of the

existing drain. Pipe culvert was laid crossing underneath of the Jalan 29.

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PLATE 8

View frow Jalan 26. Existing drain are located on the left side of Jalan 26.

(CH+75.00 CH+125.00).

PLATE 9

Jalan 27 (left). Temporary fence and plantation (right) by Majlis Perbandaran Selayang

(CH+0.00-CH+75.00).

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PLATE 10

View from Jalan 27 toward existing drain (middle) and Jalan 26.

Proposed recreational area by Majlis Perbandaran Selayang.

PLATE 11

Part of existing concrete structure collapsed adjacent to Gerai MPS.

Jalan 26 is in front of Gerai.

(CH+25.00-CH+75.00)

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PLATE 12

Part of existing concrete structure and drain wall collapsed. View from Gerai MPSarea.

PLATE 13

Existing drain (left) covered with plantations. Gerai MPS (right) was constructed adjacent

to existing drain

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PLATE 14

Part of existing concrete structure collapsed. View from back side of Gerai MPS.

PLATE 15

Soil erosion and collapsed of existing rubble wall. Jalan 27 is located in front of shoplot.

(CH+50.00-CH+100.00)

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PLATE 16

Site condition along Jalan 26. Existing drain was covered by vegetation.

(CH+125.00)

PLATE 17

Part of existing rubble wall collapsed. Drain was covered by vegetation.

(CH+75.00 CH+100.00)

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PLATE 18

Existing drain covered with grass and vegetation along Jalan 26.

(CH+100.00 CH+125.00)

PLATE 19

Existing drain covered with grass, vegetation and fruit trees along Jalan 26.

(CH+150.00 CH+175.00)

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PLATE 20

Existing earth drain along Jalan 26. (CH +175.00 CH+200.00)

PLATE 21

Existing earth drain and house along Jalan 26 and 28B.

(CH+200.00 CH+225.00

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PLATE 22

Jalan 28 B (CH+175.00 CH+200.00)

PLATE 23

Existing earth drain. House and brickwall located adjacent to the drain.

(CH+300.00 CH+325.00)

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PLATE 24

Existing earth drain. House and brickwall located adjacent to the drain. No drain reserved.(CH+300.00 CH+325.00)

PLATE 25

View from End of Jalan 28B. Existing earthdrain and brickwall. No drain reserved.

(CH+325.00 CH+400.00)

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PLATE 26

Existing rubble wall. (CH+550.00 CH+600.00)

PLATE 27

Existing rubble wall and r.c bridge at the junction of Jalan Indah 15, 17 & 1.

Brickwall (left) constructed adjacent to rubble wall. (CH+575.00 CH+600.00)

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(i) Existing Rubble Wall drain CH+625.00 (ii) Existing Rubble Wall drain CH+675.00

PLATE 28Existing rubble wall drain.

(CH+625.00 CH+675.00)

(i) Existing Steel Structure Bridge CH+700.00 (ii) Existing rubble wall drain CH+725.00

PLATE 29(i) Existing rubble wall drain. (ii) Existing twin box culvert (far end).

(CH+725.00 CH+762.

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PLATE 30

View from top of existing twin box culvert (2.30m x 2.30m). Plantation nursery (left)

and brickwall constructed adjacent to rubble wall drain (right).

(CH+762.50)

(i)(ii)

PLATE 31

View of the existing twin box culvert (2.30m x 2.30m).

End of Chainage.

(CH+762.50)

Documents

Full Report 12Oct