| Conveyance System
The stormwater must be conveyed through a system of pipes to the retention pond. Catch basins are placed throughout the parking area and a network of pipes convey the stormwater to the retention pond. Inside the retention pond an overflow outlet is used in extreme flood events to release water from the basin.
Problem Areas
Land Use
Retention ponds require additional land. This land could be used for other purposes besides stormwater storage. Often this area consumed by a retention pond is considered wasted land in the minds of developers. They are standard practice, but the land could be used more efficiently.
Maintenance
The major maintenance problem in retention ponds is vegetation. If noxious weeds or woody vegetation takes over the natural vegetation the infiltration rate and treatment ability of the retention pond will be reduced (USEPA, 1996). These areas tend to accumulate trash and other debris as well. Overtime sediments might accumulate in the basin and will have to be removed. This could be a potential hazardous waste if the stormwater has high pollutant loads.
Dostları ilə paylaş: | 
