CEDAR FALLS COMPREHENSIVE PLAN


Stormwater retrofit opportunities can be found where existing facilities are in place with no plans for redevelopment. For example, disconnecting rooftops from park- ing lots, or parking lots from streets, reduces CIS. In these cases, infiltration tech- niques and subsurface storage can be achieved with limited disturbance of existing infrastructure but achieve a significant reduction in runoff volumes and rates with improved water quality. As a point of reference, the Black Hawk County Soil and Water Conservation District recommends that 10% of residential areas be used for infiltration in order to reduce runoff and improve water quality.


REGIONAL STORMWATER TREATMENT TRAIN


As with stormwater treatment trains designed for individual sites, a series of natu- ralized stormwater management elements can be designed for much larger areas, such as subwatersheds and even watersheds. Three regional stormwater detention facilities have been built along Dry Run Creek, and an additional facility is proposed for the last undammed branch of Dry Run Creek, the West Branch. However, region- al stormwater treatment trains that incorporate protection of existing floodplains, wetlands, flowpaths, and depressions will provide greater opportunities for volume reduction and nutrient removal via infiltration and evapotranspiration. In addition, regional stormwater treatment trains facilitate recreational greenways for trails, as well as wildlife habitat and corridors.


OTHER STORMWATER BMPS


Other practices that can help the City of Cedar Falls achieve its stormwater manage- ment goals include:


• Implement restrictions on residential fertilizers (e.g., no phosphorus allowed). • Provide cost-share, technical support, stormwater fee reductions, or other incentives to homeowners and businesses that implement runoff reduction strategies, such as rain gardens and disconnection of impervious surfaces.


• Continue and expand the street-sweeping program, with special attention paid to the timing and frequency of sweeping.


• Encourage and provide incentives for conservation-based agricultural practices. These include conservation tillage, grassed waterways, filter strips, and permaculture.


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