News 70% more drains cleared this year before monsoon showers, says DDA 70% more drains cleared this year before monsoon showers, says DDANew Delhi: DDA has claimed to have removed more than 57,000 metric tonnes of silt from stormwater drains under its pre-monsoon desilting drive, marking an over 70% increase compared to last year. Enhancing the carrying capacity of drains will reduce instances of waterlogging.“Desilting exercise has been completed in the east, south and north zones.