Many types of stormwater collection facilities exist (stormwater ponds, rain gardens, infiltration swales, etc.) that collect and infiltrate water back into the ground. Studies show that many of these facilities function differently in their capacity to function efficiently while filtering pollutants.
Monitoring these facilities allows local government units to determine if their facilities are functioning as planned and if they are deteriorating in function over time. The results of this monitoring allows planning for regular maintenance of these facilities as well as determining what facilities function best for planned future facilities.