Bengaluru lets its sewage into valleys, rivers and lakes. Little sewage is processed, while much of it is unprocessed in nature.
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Rampura Valley is one of the valley systems of Bengaluru in the north east of the city. This valley gets a mix of treated and untreated water from the raja kaluve (storm water drain) sewage treatment plant, which has 40 MLD capacity and uses Extended Aeration Process. The wastewater from north-eastern parts of Bangalore flows into this plant.
The water from the sewage treatment plant passes through the canal, fills Maragondanahalli lake, overflows into Yella Mallappa Shetty Lake before the water is pumped to Dodda Kere of Hoskote.
This semi-treated water is the life line of Rampura and the other villages around. People use this raw water mainly for agriculture. They pump this water from the lake bund even to places which are couple of kilometers away, using a diesel engine or a motor.
There are many open wells here in the lakes vicinity, that are not potable. The well water is used in the construction purposes. The well owners sell the water from these wells and make their living. Cattle and other domestic animals drink water from the same lake to a larger extent.
The water in the lake and the underground water table is the lifeline of the valley, which supports more than 20 villages in the vicinity. Raju, a villager from Rampura says: Over 5 million people are benefitted by this water, as this water further goes into Kelavarapalli Dam and Krishnagiri Dam of TamilNadu in the downstream.
A variety of vegetables and greens cultivated in these fields are the only crops for these farmers to earn their living. The vegetables are sold to the markets in Bengaluru.