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May 04 06 09:48a Community Development 2099417270 p.19 Sheett i In some situations,it may be necessary to also redirect Treating and Discharging Contaminated the flow of.clean runoff water from roofed areas or up- Runoff Water slope ground surfaces.There are two options for the Runoff water that does come in contact with nutrients, runoff from a roof.The first is to use gutters to direct sediments, and microorganisms must be stored for later the runoff water to downspouts. At each downspout, treatment by Iand application.This storage is usually the water can be either released to flow away from the accomplished with tanks,holding ponds, and lagoons. heavy use area or enter a pipe or drainage channel to flow to an acceptable release point. Normally, gutters lnforrnation and assistance with the design and are designed for the heaviest 54ninute rain event that is management of liquid storage systems are available expected to occur about every 10 years.But, when through your local county Cooperative Extension used to prevent roof water from entering manure Service, SWCD or NRCS employee, or state- storage units, a 25-year, 5-minutc rain event is often registered agricultural engineer. used. In either case, gutters,downspouts, and any drainage channels or pipes should be properly sized. Inspections Storage sites need to be maintained and monitored. Rain gutters need to be protected against snow and ice Large CAFO operators are required to perform week- damage. Hanging them lower than tate projected roof- ly inspections of all storm water diversion devices, fine prevents snow and ice from sliding off barn roofs runoff collection structures,waste storage structures, and knocking the gutters down. 'Extra hangers for the and manure or runoff transporting systems.To pre- gutter, as closely spaced as 16 inches, or ice-breaking vent inadvertent overflows onto production areas or obstacles on the ro-of to stop sliding snow are often into storage areas,water lines need to be inspected d keep them working daily. If the production area includes a liquid manure required to protect the gutters an properly. storage, depth markers or staff gauges need to be installed in the storage areas to determine the avail- An alternative to gutters is to use drip trenches under able storage capacity, ensuring that a 25-year, 24-hour the roof eaves to catch runoff water and direct it to an storm (or in the case of new poultry CAFO operations, 4-hour storm) will not overtop the � acceptable release point. Dt7p trenches may be open a 140-year, .. surface channels or gravel-filled trenches with per- structure.Any deficiencies or discharges need to be forated pipe in the bottom,All surfaces beneath roof recorded and then addressed as soon as possible. eaves. including drainage channels, should be design- ed to move the water away from the building and pre- Record Keeping vent standing water. In general, this area should be Fare,owners must keep a complete copy of design, sloped at a 1qo to 5% grade away from the building. inspection, problem correction, and mortality dis- posal records for the past five years (see CAFO Fact Surface diversions or land grading are generally used Sheet#6.' What CAFO Reports Must I Submit?) to catch the runoff water and divert the flow to an acceptable release point..The diversions or grading is Cost Sharing Available? should be well vegetated to prevent soil erosion.In USDA-NRCS has allocated money that may be high water table areas,subsurface drainage should be used to cost share the BMPs needed to correctly. used to redirect the flow of water that occurs beneath handle animal manure. Check with your local the ground surface. NRCS or SWCD to see what funds are available and to determine if you qualify. CAFO Fact Sheet A competent conservation contractor, SWCD or NRCS #4: Financial and Technical Assistance Available will help you ors employee, or state-registered agricultural engineer to cosstsh re programAO s forawh ch you may be identify should design these structures.