They may also be designed to accept and store floodwaters during highwater events, increasing the overall flood storage of a system and reducing flood damages as waters can be held long enough to reduce the peak flow downstream.ĭepending on the specific type of flooding being addressed, the primary consideration when siting a flood detention basin is identifying where current and potential future flood issues exist – whether stormwater or riverine flooding – and securing the necessary land in that area to allow for a meaningful intervention in the flood impacts.įor floodwater detention basins intended to address riverine flooding, the basin should be sited or located near the middle of the watershed to provide the most efficient means of peak flow and volume reductions and control.Įxisting topography should be used as an advantage. Additional storage capacity is provided above the permanent pool for temporary run-off storage.įlood water detention and retention basins are designed to capture and slow stormwater runoff to prevent downstream flooding. The depth of the permanent pool of water is generally designed taking into consideration water quality volumes and hence wet retention basins also act as water treatment devices. Wet basins, on the other hand, retain a permanent pool of water, similar to a pond, irrespective of storm events and hence are wet year-round. Hence the basin remains dry between rain events. Dry basins retain water only during storm events, later releasing the water at a controlled rate until the basin empties. Detention basins are generally designed in two forms- dry or wet basins. Floodwater Detention and Retention BasinsĪ detention basin is an area that has been designed and designated for the temporary or permanent retention of floodwaters during rain or flood events.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |