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ORANGE COUNTY PLANNING & INSPECTIONS DEPARTMENT <br />POST OFFICE BOX 81$1 306-F REVERE ROAD <br />HILLSBOROUGH, NORTH CAROLINA 2727$ <br />~,,.~. „ e <br />c` *, <br />u ~, <br />,. <br />•~ ~.~•~~ <br />EROSION CONTROL DMSION <br />Carrboro/Chapel Hill %8501 Durham b88-7331 Hillsborough 732-8181 Mebane 227-2031 <br />Telephone Exunsion 2586 FAX 919fi44-3002 <br />Memorandum <br />TO: Craig Benedict, Planning Director <br />FROM: Warren Faircloth, Erosion Control Supervisor <br />SIISJECT: Woodlands Subdivision <br />Hydrologic & Hydraulic Engineering Report <br />DATE: August 1, 2000 <br />The report answers questions about the culvert under: Nine Gates <br />Road but does not address other questions about increased flow <br />through the Cox property. The illustration in the report <br />demonstrates the benefits of using a 54" culvert instead of the 24" <br />pipe to handle the existing flow without overtopping the road. This <br />is a NC DOT requirement. <br />The report just states the increase in the rate of runoff from the <br />S lots through the Cox property. It does not address the effects, <br />if any, this increase will have on the existing wet soil or on the <br />diversion that conveys runoff in a path different than that shown <br />on the topographic map. (The engineer would not have been aware of <br />this man made diversion unless he went onto the Cox property.) It <br />appears that the increased runoff through the Cox woods and pasture <br />will not will not have significant impact since the flow follows <br />the existing, natural flow path. The path is not developable <br />because of the poor soil and any structures would have to be built <br />outside of, the.drainageway. <br />The suggestion has been made to retain the temporary sediment basin <br />as a permanent stormwater detention basin above the Cox property. <br />A basin would have to be properly sized, particularly the outlet, <br />to provide an~r--benefits. Given the large lots, retention of <br />vegetation, limits on impervious surface, and use of grass swales <br />the need for a basin is questionable. If provided, the homeowners <br />association should maintain the basin. <br /> <br />X57 6.14-00 <br />