Connoquenessing Creek Watershed Conservation Plan - Western ...

Connoquenessing Creek Watershed Conservation PlanChapter 3. Water Resourcesgroundwater, or periodically saturated for varying periods during the growing season. Thesecharacteristics of wetlands are due to the fact that wetlands occur where the water table is at or very nearto the surface. Seasonal fluctuations of the water table result in the wetland being wet or dry.Wetlands retain water, which is slowly released to surface water streams. Depending on the level ofthe water table in relation to the wetland, water may be absorbed into the ground from wetlands if thewater table is lower than the wetland. The absorption quality of a wetland or network of wetlands helps toreduce the severity of flooding by retaining excess water flow and slowly discharging the water as thewater table or water levels recede.Wetlands filter water by a variety of mechanisms. Wetland vegetation slows the velocity of waterrunning through them, allowing more time for suspended sediment to settle out. Pollutants, such aschemicals and metals, which are bound to the sediment particles also settle and separate from the flowingwater. Nutrients from fertilizers, manure, and sewage are utilized by the plants growing in the wetland,and are removed from the water.Wetland systems often support a variety of living organisms, termed biodiversity. The nutrient richsediment that collects in a wetland provides abundant nutrients and food resources for plants and wildlife.The emergent vegetation and dead, standing timber provide excellent breeding and nesting habitat forinsects and wildlife, especially waterfowl. Many migratory species depend on wetlands for rest andrecharge during their long migratory treks.Vernal pools are one type of wetland, where isolated ponds are created during the spring fromrainwater and snow melt that has collected in depressions in the ground. These critical habitats providebreeding grounds for woodland frogs and salamanders. Vernal pools also support a variety of otherfloodplain, meadow, shrub lands, and woodland species.Wetland LossMore than half of all wetland habitats that once occurred in Pennsylvania have been lost. The majorcauses of wetland loss have been impoundment, drainage for agriculture and development, andconversion to other uses. The reduction of wetlands in any given area can drastically impact health andhuman safety by leading to increased occurrence and severity of flooding, decreased natural water qualityrevitalization, and exacerbated drought conditions. Loss of wetland habitats also negatively impactswildlife by increasing the distance between remaining wetlands, which reduces the ability of animals tomove from one wetland to another and to recolonize.The stricter environmental regulations existing today prevent major wetland drainage andimpoundment. However, recent federal court decisions have reduced the protections given to smaller,isolated wetlands under the Clean Water Act. Although smaller wetlands still receive some protectionunder Chapter 105 of the Pennsylvania Code, permits can often be acquired for their alteration ordestruction (Pennsylvania Game Commission, 2005b).In Pennsylvania, the U.S. Army Corps of Engineers has issued permitting regulation authority toDEP, where one acre or less of wetlands is impacted. A general permit form must be obtained from thecounty conservation district or regional DEP office to change, expand or diminish the course, current orcross section of a watercourse, floodway or waterbody, including wetlands. In addition, the localmunicipality and county must be notified of the applicant’s intent to obtain a general permit (DEP,2006b).DEP, in conjunction with the National Fish and Wildlife Foundation, has established a fund, calledthe “Pennsylvania Wetland Replacement Project,” to help permit applicants meet the wetland replacement3-11