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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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