DeLand receives about 31 inches of precipitation annually. This water either soaks into the ground (infiltration) or flows overland to ditches, streams or ponds (storm water runoff). Most of the run off in DeLand flows to Little Haw Creek, although some flows to Lake Winnemissett or to the streams that lead to the St Johns River.
Impact of Development
Development changes the natural flows. Constructing new buildings and parking lots in areas that used to be fields or woods typically reduces infiltration and increases storm water runoff, which leads to higher flows in area streams.
To reduce this effect, the City of DeLand requires that detention/retention facilities be constructed with all new development projects. These facilities temporarily store storm water runoff and release it through a designed outlet structure.
In municipal areas such as DeLand, a separate storm sewer system is typically constructed when new streets, subdivisions and commercial sites are developed.
The storm sewer system routes storm runoff quickly off streets and away from buildings or other structures. Storm sewer pipes eventually discharge to a swale, stream, river or other surface water body.
Because the volume of water passing through a storm sewer system is so great, it is generally not feasible to route the water to a treatment plant — as is done with wastewater in the sanitary sewer system. Therefore, storm runoff enters our streams and rivers without any treatment. If the runoff contacts any pollution as it flows overland or through the storm sewer system, those pollutants eventually end up in streams and rivers.