Disconnecting and redirecting portions of stormwater flows from the canals and pumps in New Orleans would reduce the amount of water entering the pump system and may reduce the rate of subsidence in New Orleans. Based on the soil conditions encountered and the stormwater flows that are present within each sub-watershed, there would be a variety of stormwater Best Management Practices (BMPs) for managing stormwater.
Managing stormwater requires a decentralized approach. While there may be consistent site conditions within a neighborhood and one type of BMP may be appropriate, in general the site conditions determine the BMP type. Depending on the site conditions, a stormwater BMP may provide recharge (e.g. infiltration bed), attenuation and storage (e.g. traditional detention basin), or filtration (created wetland). Each BMP would require a specific type of operation and maintenance to ensure the long-term performance of the particular facility.