Some of these techniques (called best management practices (BMPs) in the US), focus on water quantity control, while others focus on improving water quality, and some perform both functions.
在美国，一些所谓的最佳管理做法（英语：Best management practice for water pollution）（BMPs）注重于对水量的控制，一些注重于改善水质，另一些措施則具备两种功能。