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