drainage design report for perbadanan putrajaya
TRANSCRIPT
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8/10/2019 Drainage Design Report for Perbadanan Putrajaya
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PURPOSE OF
SUBMISSION
PERMOHONAN KELULUSAN PELAN KERJA JALAN DANPERPARITAN
AUTHORITY PERBADANAN PUTRAJAYA
JABATAN PEMBANGUNAN BANDAR
KOMPLEKS PERBADANAN PUTRAJAYA
PRESINT 3
62675 PUTRAJAYA
DEVELOPER /
CLIENT
PUTRAJAYA HOLDINGS SDN BHD
BLOCK 1, MENARA PjH, PRECINCT 2
PUSAT PENTADBIRAN KERAJAAN PERSEKUTUAN
62675 PUTRAJAYA
PROJECT
TITLETHE PROPOSED CONSTRUCTION AND COMPLETION OFROADWORKS PACKAGE R11D PUSAT PENTADBIRANKERAJAAN PERSEKUTUAN PUTRAJAYA
DOCUMENT
TITLEPERKIRAAN REKABENTUK PERPARITAN
CONSULTING
ENGINEER
NAME :
DESIGNATION :
DATE NOVEMBER 2010
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8.0 Design Flow of Drain (Peak Surface Runoff)
The design flows of the drains determination basically derived from the Modified RationalMethod formula as follows:-
Q = C x i x A360
Where, Q = peak surface runoff (m/s)C = surface runoff coefficienti = rainfall intensity (mm/hr)A = catchments area (ha)
The runoff coefficient is as follows:-
Land Use Runoff Coefficient
Pavement 0.95
Verges 0.30
9.0 Drain Sizes Computation
The drain size computation is calculated based on the Mannings Formula. The procedures areas outlined in Volume 10 of Urban Stormwater Management Manual for Malaysia by theDepartment of Irrigation and Drainage, Malaysia (2000).Based on the procedures, the design flow computation and sizes determination are based onthe following formula and the design chart 26.4
.Q x N .
S1/2
x B8/3
Where, Q = design flow (m/s)C = Manning roughness coefficientS = drain longitudinal average slope (%)
B = desirable drains base width (m)
The Manning roughness Coefficient is as follows:-
Surface Finishes n
Pavement 0.011
Concrete 0.013
Turf 0.15
10.0 Design Calculation
The drain flow computation and drain sizes determination are shown in the attached tabulationsheets for each sub-catchment of pavement areas.
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