Laserfiche WebLink
elevation shall be a minimum of 12-inches above the associated elevations <br /> shown on the FIRM ( Flood Insurance Rate Map) or 12 inches above the 25-year <br /> — .24-hour storm event elevation , whichever is greater. <br /> I . In IRCDUS maintained lift station , pumps shall be per the Approved <br /> Manufacturer' s Product List. If a grinder pump is proposed , see Approved <br /> . Manufacturers Product List . Only grinder pumps under 10 . 0 hp are permitted <br /> unless approved by IRCDUS . <br /> J . Lift Station Calculation Checklist (all assumptions shall be listed in calculations <br /> and in an orderly fashion ) : <br /> 1 . Design flow <br /> 2. Downstream force main size & down stream head pressure (in psi or feet <br /> of water) <br /> 3 . TDH of pumps shall exceed system head curve <br /> 4 . Pump selection make , model , HP , impeller <br /> 5 . a . Wet well dimensions <br /> b . Operating cycle and draw down time <br /> 6 . Buoyant computations Documentation : <br /> a . Buoyant force <br /> b . Downward force <br /> c. Safety factor <br /> d . Depth to water table <br /> 7 . Designer name , date , design firm , Indian River County project number, <br /> project name , designer name of revisions <br /> 11 . 03 WATER DISTRIBUTION <br /> A. All water mains shall be constructed in accordance with the Indian River County <br /> Water Master Plan , latest edition , or current AWWA Standard Specifications and <br /> current regulatory agencies requirements . <br /> B . All distribution systems shall be properly looped , where feasible , and valved to <br /> provide maximum flexibility in providing service . <br /> C . Design shall be based on an average daily consumption of 100-gallons per <br /> capita per day, a maximum day ( MD ) factor of 2 . 25 times average day and a <br /> peak hour factor of 4 . 5 times average day, per Indian River County Ordinance . <br /> D . Distribution systems shall be sized to provide for 100 percent of the combined <br /> required fire flow and maximum day demand rate , while maintaining a 20-psi <br /> residual pressure in the distribution system . <br /> E . All water mains shall be designed to provide a minimum pressure of 25-psi at <br /> ground level at all points in the distribution system under all conditions of flow <br /> (except as noted in D above ) . <br /> F . Dead-end 4-inch water distribution system mains may be used to serve up to 10 <br /> ERU 's , but shall not exceed 300 linear feet and down stream of last Fire Hydrant <br /> Assembly. <br /> 11 - 3 <br />