Slope Restoration for Microflood Management


The mine pit at the base of the Aravali Hills in Nepali Camp, Delhi, overflows frequently, flooding homes in the settlement. Wastewater with solid waste flows into the pit from two informal drains. This has silted the base and made it non-permeable. Silting has also reduced the pit's carrying capacity. CURE's slope restoration project had three components; clear the slope of solid waste to make it more permeable; treat the wastewater in the informal drains using bioremedial treatment system; and stabilize the slope by planting trees. The ideas were discussed with the community, the government officials and biodiversity experts. Community led on the slope cleaning together with the city authorities. A playground was developed at the top of the slope, to ensure no new waste is deposited. A door-to-door waste collection system was initiated to reduce waste dumping. Wastewater drains were deepened. Barriers were created using stones on the drain sides. The drains were filled with gravel and sand to create cascades to retain, consume and treat wastewater. Deep-rooted, native plants and earthworms that naturally purify wastewater were planted in the drains. Floating reed beds of bamboo, coir and coconut logs; and wetland plants were added into the pool water. The slope restoration project was able to prevent flooding and revive the biodiversity of the pond, with ducks making a comeback. The project's major challenge was from the large population of pigs in the area, that broke through the fencing and ate up the plants, lowering the treatment capacity.

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