Location of Bangalore City

• Topography : Situated on undulating land intermittently dotted with low hills and valleys
• Latitude       : 13° North
• Longitude    : 77° East.
• Elevation     : About 1000 meters above MSL

Climate of Bangalore City

• Temperature       : Mean annual 24°C ;
  Extremes:15°C in winter, 37°C in summer
• Average rainfall : 972mm (30 years average) mainly distributed over 8months – April to November
  with around 60 rainy days in a year
• Natural Drainage Valleys :

• Hebbal Valley
• Vrishabhavathi Valley
• Koramangala-Challaghatta Valley

• Number of Lakes    : 82

Water Potential & Availability

1. Total quantum of water potential from all the four sources – 994 million lts. per day (MLD)
2. Actual availability of water per day

Water received             –  910 MLD
Water requirement                    – 1300 MLD
Water deficit                             –  390 MLD
As per WHO standards           –  Requirement is 135 LPCD
Availability of water is 119 LPCD                    

Population and Water demand in BBMP Area

Water – The life

• Water is very much essential for life
• In the modern society water fulfills several needs
• Water for drinking, bathing and cooking food are among the important daily needs for human kind

Water – The source

• Fresh water is made available for consumption in  many ways
  • Natural springs
  • Step wells, Ponds & lakes
  • Canals, Rivers
  • Open wells & tube wells

Rainwater – to rely on

1. Rain water would be the immediate resource to augment existing water supply system
2. By Simply “Catching wherever it falls”

Bangalore has around 60 rainy days and like a clock work 85% of the rain arrives between 4p.m. and 7p.m.

Rainwater – at all places

1. Three methods
1. Roof top RWH
2. Runoff RWH (landscapes, parks, storm water drains, roads, etc.)
3. Natural storage and collection through lakes and tanks

Various stages of rainwater Harvesting