seminar ppt_storm water & sewerage design-1_2915
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7/27/2019 Seminar PPT_Storm Water & Sewerage Design-1_2915
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Title:Storm Water & Sewerage Design using Computer Aided Design
Prepare by : Abhijit A. Haval
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Storm water Drainage Design using SSA Validation of Results
Sewerage System Design Conclusion
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NetworkMaster Plan
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Lets take the network between the nodes 3 & 2. Drain width (B) = 0.6m Water depth (h) = 0.29m Slope of drain (S) = 0.006 m/m Mannings constant (n) = 0.015 Hydraulic radius (R) = A/P = (0.6x0.29)/(0.6+2x0.29) = 0.147m
Mannings formula for velocityV = (1/n) x R2/3 x S1/2
= (1/0.015) x 0.1472/3 x 0.0061/2= 1.4 m/s
As per Storm & Sanitary AnalysisV = 1.38 m/s which is nearly equal to 1.4 m/s
Hence OK.As per calculationQ = CiA
Where,C = Coefficient of runoff = 1.0i = Intensity of rainfall = 50 mm/hrA = Catchment area = 15605.8 m2Q = 1 x 15605.8 x 50 /(1000 x 3600)
=0.21 m3/sAs per Storm & Sanitary AnalysisQ = 0.203 m3/s which is nearly equal to 0.21 m3/s
Hence OK..
600
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SewerageNetworkManhole Sizes & shapes
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Population for one apartment = 3 x 8 x 5 = 120 personsWater Supplied =180 LPCDSewage Generated/ Apartment =0.8x180x120/(24x60x60x1000)
=0.0002 CMSNo. of Apartments =12Total sewage generated =12 x 0.0002
=0.0032 CMS
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For node between 13 to 12Required Discharge input = 0.0035 CMSAssumed pipe size = 150mmAssumed slope = 1:150Mannings constant = 0.011Velocity of Flow = (1/n) x R2/3 x S1/2
= (1/0.011) x 0.03752/3 x (1/1500)/2= 0.832 m/s = permissible Hence OK
Actual Discharge Output = A x V= 0.0088 x 0.832= 0.0073 CMS > 0.0035 CMS Hence OK
FRL of starting manhole = 99.6mIL of starting manhole = 99.6 1 = 98.6mIL of ending manhole = 98.6 (Length/slope)=98.6 (29/150)
=98.567mDepth of Starting manhole = 1mDepth of ending manhole = FRL IL
= 99.6 98.567=1.003m
Hence provide BBM manhole of size 1200 x 900 mm & pipe 150 mm diameter @ 1:150 slope.
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Sr.
NoDescription QTY UNIT RATE in Rs AMOUNT in Rs
1 Excavation for Sewer 1125 Cum 500 562500
2 uPVC pipe 150mm dia 750 m 352 264000
3 Manhole 1200 x 900 36 Nos 5996 215856
4 SFRC Covers 36 Nos 6388 229968
5 Sand bedding below pipeline 112.5 Cum 240 27000
Total 1299324
Cost/ Rmt 1732
Sr.
NoDescription QTY UNIT RATE in Rs AMOUNT in Rs
1 PCC for Drain 159 Cum 3600 572400
2 RCC for Drain 855.4 m 5915 5059809.3
3 RCC for drain Cover 140.7 Cum 5443 765911.745
4 Reinforcement 55 MT 46200 2541000
Total 8939121
Cost/ Rmt 5622
ForSewerage
For Storm water Drain
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Storm and Sanitary Analysis is an advanced, powerful, and comprehensive
package for analyzing and designing urban drainage systems, storm water
sewers, and sanitary sewers. The software is easy to learn & use. The
software allows you, at any time, to interactively add, insert, delete or
move any network element, automatically updating the model. Its
advanced output enables the user to make his deliverable in short time.Storm & sanitary Analysis have wide range of capabilities; hence we can
rely on single software instead of using different softwares for different
designs.The Results of software are reliable & can be cross checked by
mathematical calculations.
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