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Prof. S. D. Chawathe, Senior ConsultantMWH India (P) Ltd. Mumbai

19/1/2012

Institution Of Engineers (India)

RAINFALL ANALYSISFORSTORM WATER MANAGEMENTSYSTEMS

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RATIONAL METHOD

OFDESIGN

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ANNUAL MAXIMA METHODUSES ANNUAL MAXIMUM RAINFALL FOR

VARIOUS DURATIONSOVER PAST YEARS

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S. D. CHAWATHE

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BANGALORE ( P. KHAGESHAN)

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AMRAVATI (DR. TATEWAR ET AL)

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NEW DELHI (TOSHNIWAL C. T.)

T= 1 YR 2.291 X 10 ** 6

i = ----------------------------------

( t + 188.85 ) ** 6.848

ALSOT = 1 YR i = 0.0004174(t -99.28) ** 2

T = 2 YR i = 0.0001177( t -181.9) ** 2

T = 3 YR i = 0.0003165(t 129.18) ** 2

T = 4 YR i = 0.0004692( t 119.94)** 2

T = 5 YR i = 0.0002755 ( t 149 ) ** 2

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KOLKATA (PROF. V. RAMAN ET AL)T = 1 TO 3 MONTHS 6200 T ** 0.358

i = ------------------------------( t +45 ) ** 1.75

T = 1 TO 2 YRS 953 T ** 0.157

i = --------------------------( t + 45 ) ** 1.34

T = 5 TO 20 YRS 290 T ** 0.119i = -----------------------------

( t + 45 ) ** 1.05

T = 1 MONTH TO 20 YRS 810 T ** 0.126i = -------------------------------

( t + 45 ) ** 1.31

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PUNE (S.D.CHAWATHE)

1 TO 1.75 YRS 5425 FREQ ** 0.4837i = --------------------------------- i IN M M/HR

( DUR + 33.44)** 1.40192 TO 2.75 YRS

107840 FREQ ** 0.564

i = ------------------------------------ DUR IN MIN.( DUR + 69.08) ** 2.00293 TO 3.75 YRS

135140 FREQ ** 0.6036i = ------------------------------------- FREQ IN MONTHS

( DUR + 79.96 ) ** 2.06954 TO 5 YRS

1761900 FREQ ** 0.6709i = ----------------------------------------

( DUR + 115.58) ** 2.55

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CHENNAI MOTT MAcDONALD

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RAMBABU

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AKOLA

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NOMOGRAM FOR AKOLA

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DESIGN METHOD

BASED ONCHICAGO CURVES

NEEDS SOFTWARE SUCH AS

INFOWORKS

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RETURN PERIOD FOR MUMBAI AT PRESENT BRIMSTOWAD MASTER PLAN IS BEING

UPDATED AND THE RETURN PERIOD OF TWICE INONE YEAR ADOPTED EARLIER IS BEING

RECONSIDERED IN THE LIGHT OF THE FLOODINGOBSERVED ON 26TH JULY 2005 IN MUMBAI.

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SPATIAL VARIATION

OFRAINFALL

OVERMUMBAI

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puzzleland.in

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THANK YOU