Post on 15-Feb-2016
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Design of a Wastewater Collection Network for the New Nablus Area (B)
Design of Wastewater and Stormwater Collection Networks for Bait Wazan VillageByDawlat NajjarBeesan Jamal Rawand ShaarSupervisor Dr. Mohammad N. Almasri
December 2013
INTRODUCTION3
METHODOLOGY
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Selection of the study areaFor sewerDesign the network using the SewerCADDesign the network using the StormCADDetermination of design constraintsDistribution of catch basin and estimate the area Distribution of manholes and estimate the loadConclusion and recommendationNetwork delineationData collectionFor stormEstimate the cost of networkLOCATION8
Bait Wazan VillageAn- Najah National University
19Velocity Constraints
6Effective WASTEWATER & STORMWATER COLLECTION NETWORKSEFFICIENT SOFTWAREENGINEERING CONCEPTSGOOD DESIGN
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C=.2C=.1C=.3locationConduit IDParameterWastewaterstormwaterWastewaterstormwaterWastewaterstormwaterAt the beginningCO-1Velocity (m/s)0.51.240.51.020.51.4Flow (m3/d)10.373473.2810.372855.347210.373919.104Slope (%)7.582.567.582.567.582.56Diameter ( in)888888At the middleCO-130Velocity (m/s)0.51.710.51.930.51.93Flow (m3/d)6.154790.886.155402.76486.155402.7648Slope (%)11.98.6211.98.6211.98.62Diameter ( in)888888At the endCO-247Velocity (m/s)2.35.262.34.422.35.91Flow (m3/d)974.8132641.28974.862664.0019974.8149030.72Slope (%)121012101210Diameter ( in)82481882415PROCEDURES
effective wastewater network designWastewater network cost
Conclusions
8 inch diameter sewer lines from UPVC were used in design of the wastewater collection network. And (24,18,15,12,10,8) inch diameters are used in design of the stormwater collection network .
Cost of the WASTEWATER NETWORK is $92/M .
SewerCAD and StormCAD are efficient software for the design of wastewater and stormwater collection networks .
Though the designs we made cannot be used for implementation as they are yet they provide a good approximation to the real networks along with realistic cost .
This project helped us to broaden our way of thinking and that design constraints can be compromised to arrive at realistic conditions .12Plan for network
SOFTWARE USED FOR DATA PROCESSING11
The cost of wastewater Network16
Covers Manhole
ManholesRings ManholeBases Manhole
Cones Manhole
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SandUPVC
ExcavationBackfill
92$/m18
$700$400$280$170$80$17020Slope Constraints
21Cover Constraints
Profile of Street adverseslope22
Longest profile in the network23
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Shortest profile in the network25
An example of profile
Top view of profile27
Conduit ID: CO-195before:-cover: 3mvelocity: .5 m/sslope: 4.57%after2-cover: 1.1mvelocity: .69 m/sslope: 12%
Conduit ID: CO-198before:-cover: 4.3mvelocity: .5 m/sslope: 4.97%after:-cover: 1.1mvelocity: .67 m/sslope: 12%
Conduit ID: CO-34before:-cover: 4mvelocity: .5 m/sslope: 7.91%after2-cover: 1mvelocity: .27 m/sslope: 1.34%
Conduit ID: CO-35before:-cover: 2mvelocity: .5 m/sslope: 10.77%after:-cover: 1mvelocity: .33 m/sslope: 3.24%
Conduit ID: CO-36before:-cover: 1mvelocity: .25 m/sslope: 2.27%after:-cover: 1mvelocity: .25 m/sslope: 2.27%
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408 manholes with 1 meter diameter
408 conduit in sewer network with 8 inch diameter
12 km the length of networkThe wastewater Network
Factors affecting the Stormwater31From Rational method Runoff coefficient
Soil type
Shape of drainage area
Previous moisture conditions
Slope of watershed
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Amount of impervious soil
Land use
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The Key parameter that have effective impact is Runoff coefficient(C)
In order to assess the value of C that are closer to reality we studied the previous case that simulate to our case (north-eastern part of the City of Nablus) . Since they make calibration between the real case and the model output.
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When finding that the value of C must be low . we revisited the study area and found that there are few depressions that impact the generation of stormwater
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In addition, the rocks of the study area are oriented in away that obstructs the stormwater
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IntensityRainfall intensity is defined as the rate of rain that falls during a storm event
Design value of intensity depend on :-TcReturn period
38Tc depend on:-
tf = L/VIn residential areas (2-5) years design period is considered and we use 2 years
Return period
t39For our study areaIDF for Nablus (PWA)
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Catchment Area
422-yearlocationConduit IDParameterWastewaterstormwaterAt the beginningCO-1Velocity (m/s)0.51.24Flow (m3/d)10.373473.28Slope (%)7.582.56Diameter ( in)88At the middleCO-130Velocity (m/s)0.51.71Flow (m3/d)6.154790.88Slope (%)11.98.62Diameter ( in)88At the endCO-247Velocity (m/s)2.35.26Flow (m3/d)974.8132641.28Slope (%)1210Diameter ( in)824
2-year return period435-year return periodConduit 130 :-
4410-year return periodConduit 130 :-
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we have 390 catch basinwe have 390 conduit in Storm network12 km the length of networkRang of the diameterThe Stormwater NetworkDiameter (in)Length (m)24128018994151447124371020258594047