Water From Rainfall in Bengaluru!

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Bengaluru city spread over 600 Sq Kilometers (266 Sq. Miles) receives an average rainfall of about 900 mm (35 Inches), Annually. Since rainfall is an important source of replenishing city's water sources, here is an attempt to tabulate the monthly and annual rainfall over a period and compute the same into total water received in terms of Cubic Kilometers (KM3).

This data is from year 1972 and majority of it is obtained from GKVK, UAS, Bangalore.

 

Year 

Annual
Rainfall
(in mm)

Water Recd.
(in KM3)
2010 1027.2 0.698
2009 811.86 0.552
2008 1072.41 0.729
2007 1013.3 0.689
2006 639.1 0.435
2005 1350.3 0.918
2004 1159 0.788
2003 649.7 0.442
2002 628.3 0.427
2001 1000.5 0.680
2000 1939.6 1.319
1999 1732 1.178
1998 1184.6 0.806
1997 1196.7 0.814
1996 886.6 0.603
1995 1379 0.938
1994 409 0.278
1993 1176.6 0.800
1992 790.7 0.538
1991 2698.2 1.835
1990 528 0.359
1989 1245.6 0.847
1988 1285.7 0.874
1987 826 0.562
1986 917.5 0.624
1985 1208.9 0.822
1984 1394.8 0.948
1983 792.6 0.539
1982 901.9 0.613
1981 808.7 0.550
1980 1788.7 1.216
1979 1305.2 0.888
1978 1086.4 0.739
1977 1693 1.151
1976 693.7 0.472
1975 1193.2 0.811
1974 753.8 0.513
1973 930.4 0.633
1972 811.7 0.552

 

Note -For converting rainfall in mm into KM3, pls refer the calculations given in http://praja.in/en/projects/3230/announcement/water-facts-we-should-know#comment-26648

AttachmentSize
Rainfall In Bengaluru.xls46.5 KB

Comments

TMCs

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With 1 Cubic Kilometer = 35,314,666,721.49 cubic Feets (35 TMCs)

So on average bangalore gets around 20 TMCs of water from rain. Some water flows from Nandi hills side are caught in TG Halli dam and Hoskote lake..