When should rainwater be harvested?

The average number of rainy days in Bangalore is 67. Over the last 5 years it has rained as follows:

Year Total Rainfall
(mm)
No. of Rainy Days Volume of water collected
(in litres) - 100 sq. mtr. roof
1994 587.10 107 46968.00
1995 1072.20 116 85776.00
1996 1173.30 118 93864.00
1997 717.40 88 57392.00
1998 1431.80 115 114544.00

It is possible to collect rainwater in Bangalore throughout the year and use the same for:

  • only gardening purpose
  • gardening, car washing and domestic non-potable purpose like washing clothes, dishes, bathing, toilet, swabbing the floor, etc
  • For all purposes including potable purpose i.e. drinking and cooking but only after boiling and filtering the water.
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