seminar ppt_storm water & sewerage design-1_2915

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

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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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seminar ppt_storm water & sewerage design-1_2915

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