storm water management systems
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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