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Management Measures for Agricultural Sources - Facility Wastewater and Rur,�f- Large Confined Ani... Page 6 of 8 The lined section extends up the side slopes to a designed depth. The earth above the permanent lining may be vegetated or otherwise protected. This practice may reduce the erosion in concentrated flow areas resulting in the reduction of sediment and substances delivered to the receiving waters. When used as a stable outlet for another practice, lined waterways may increase the likelihood of dissolved and suspended substances being transported to surface waters due to high flow velocities. • f. Roof runoff management(558):A facility for controlling and disposing of runoff water from roofs. This practice may reduce erosion and the delivery of sediment and related substances to surface waters. It will reduce the volume of water polluted by animal wastes. Loadings of organic waste, nutrients, bacteria, and salts to surface water are prevented from flowing across concentrated waste areas, barnyards, roads and alleys will be reduced. Pollution and erosion will be reduced. Flooding may be prevented and drainage may improve. . g. Terrace (600):An earthen embankment a channel, or combination ridge and channel constructed across the slope. This practice reduces the slope length and the amount of surface runoff which passes over the area downslope from an individual terrace. This may reduce the erosion rate and production of sediment within the terrace interval. Terraces trap sediment and reduce the sediment and associated pollutant content in the runoff water which enhances surface water quality. Terraces may intercept and conduct surface runoff at a nonerosive velocity to stable outlets, thus reducing the occurrence of ephemeral and classic gullies and the resulting sediment. Increases in infiltration can cause a greater amount of soluble nutrients and pesticides to be leached into the soil. Underground outlets may collect highly soluble nutrient and pesticide leachates and convey runoff and conveying it directly to an outlet, terraces may increase the delivery of pollutants to surface waters. Terraces increase the opportunity to leach salts below the root zone in the soil. Terraces may have a detrimental effect on water quality if they concentrate and accelerate delivery of dissolved or suspended nutrient, salt, and pesticide pollutants to surface or ground waters. • h. Waste storage pond(425):An impoundment made by excavation or earth fill for temporary storage of animal or other agricultural wastes. This practice reduces the direct delivery of polluted water, which is the runoff from manure stacking areas and feedlots and barnyards, to the surface waters. This practice may reduce the organic, pathogen, and nutrient loading to surface waters. This practice may increase the dissolved pollutant loading to ground water by leakage through the sidewalls and bottom. • i. Waste storage structure (313):A fabricated structure for temporary storage of animal wastes or other organic agricultural wastes. This practice may reduce the nutrient, pathogen, and organic loading to the surface waters. This is accomplished by intercepting and storing the polluted runoff from manure stacking areas, barnyards and feedlots. This practice will not eliminate the possibility of contaminating surface and ground water, however, it greatly reduces this possibility. • j. Waste treatment lagoon (359):An impoundment made by excavation or earth fill for biological treatment of animal or other agricultural wastes. http://www.epa.gov/owow/nps/MMGI/Chapter2/ch2-2bl.html 2/6/2009