Water Management (DWM) is the process of managing the timing and amount of water
discharged from agricultural drainage systems. DWM is based on the premise that
the same drainage intensity is not required at all times during the year. With
DWM, both water quality improvement and production benefits are possible. Water
quality improves when less tile drainage reduces the amount of nitrate that
leaves farm fields. DWM systems can also retain soil moisture for crop use later
in the season.