What is a key characteristic of a dry detention basin?

A dry detention basin is designed primarily to manage stormwater runoff by temporarily storing it and then releasing it slowly over time, typically after a rain event. One of its key characteristics is its ability to function at a predevelopment drainage rate, which means that it helps to mimic the natural drainage conditions that existed before the area was developed. This is crucial for controlling flooding and erosion downstream and maintaining the natural hydrology of the watershed.

Throughout the dry periods, these basins remain empty, which distinguishes them from wet detention basins that are always filled with water. By handling stormwater efficiently and ensuring that the rate at which water is discharged is consistent with predevelopment levels, dry detention basins effectively contribute to environmental protection and sustainability in urban planning.