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oTo facilitate the process of providing consumers with clean water.
oProvide quantity that suit their needs and control the quality of this water because the presence of this network ensure unpolluted water and access to consumers with best quality.
•Design new WDN•Design a WDN to satisfy the future population growth.•Design a conveyance pipeline from the water supply to the village tank.
Asira is located to north of the city Nablus, at a distance of 6
kilometers. It surrounds by Yassid, Bit-Mreen and Nesf-Jbeil for the
north, from the west the Sabastya and Ajnsnya villages, from east
Taluza and Wadi al-Bathan. Asira village overlook the southern
city of Nablus and the village of Iraq-Taieh. The village elevated
at about 650m about sea mean level. The Geographic coordinate
of the village is (x=175 Km, y =184 Km) according to the local
Palestinian grid.
o The climate of Asira Village is hot in summer and cool and rainy in winter, thus it does not have a big difference than that of Nablus City. The temperature of the air in the village is moderate; it has an average of 20.3 C.
Population from Palestinian Central Bureau of Statistics
Year Population numbers
1967 3217
1975 3620
1987 4568
1992 5090
1997 5724
2000 6421
2007 8200
2010 9675
Determination of DemandDetermination of DemandAssume The Demand =85 L/C-DAssume the number of person in
each House =10 persons• Determine the expected number
of houses that each junction will serve , picture below will describe the procedure
Design CriteriaDesign Criteria1- Velocities range (0.3 – 3) m/s.
2- Pressure head between (20-100)m.
Determination of Determination of DiametersDiametersStart with initial diameter =6
inchesRun the Network by WaterCADSee the result of pressure and
velocityCompare it with design criteria Change the diameter until satisfy
the criteria
Design of TankDesign of TankThis method depends on the
following assumptions :The expected number of persons
in 2040 = 24177The expected number of houses
in 2040 = 24177/10 = 2418Each house has an average roof
tank volume = 1.5m3
The tank will provide the village two days
The demand of village = 2*.085*24177 = 4110 m3
The required volume of tank = 4110- (2418*1.5)= 500 m3
Design of PumpDesign of PumpBy applying Bernoulli equation between
the source and the tank:H1 + hp = H2 + hl , we will use The
Darcy-Weisbach equation is: = (.02*8467/0.152)* ((2.132)2/2*9.81) = 257.61 m To determine Hp ,use Bernoulli equationP1/ɣ+Z1+V1
2/2g + Hp= P2/ɣ+Z2+V22/2g
+ hl
Hp = 732.6 ; we take Hp =780m as factor of safety for minor loses
Required pump power = Where power in KW, Q: flow in
pipe (m3/s), hp: head added by pump, specific weight(N/m3)
Q in pipeline =0.38 m3 / s, Hp = 780m, water = 9810 N/m3
The required power = 396KW
Design of conveyance Design of conveyance PipelinePipelineIn determine the pipe diameter
we assume the followingAssume diameter=6 inApplied continuity equation
Q=V*AQ=140 m3/hour =.0388 m3/sV=0.0388/(π/4*(0.152))=2.13
m/s within the accepted limit (0.3 -3 ) m/s
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