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ORANGE COUNTY PLANNING 8~ INSPECTIONS DEPARTMENT <br />Craig N. Benedict, AICP, Director <br />L"an'P or e' <br />Erosion Control Division ~~` ~°p 306E Revere Road <br />(919) 245-258$ u ~ P O Box 8181 <br />(919) 644-3002 (FAx) Hillsborough, <br />www.co.orange.nc.us '"~<<e ~.~~~~'~ North Carolina, 27278 <br />'~~~ ~~ <br />To: Craig Benedict, AICP, Planning Director <br />From: Ren Ivins, Erasion Control Supervisor <br />Date: February 22, 2001 <br />Subject: Sunrise Springs Starmwater Requirements <br />I met with Mr. Dodson in the field in January of this year and suggested the following <br />measures to what I believe is his satisfaction. The Proposed Sunrise Springs site was <br />inves#igated and is still in compliance. <br />This memorandum is intended to clarify the duties and responsibilities of the Developer in <br />providing both peak flow reduction and velocity reduction in and to an existing wet weather <br />drainage. <br />The Developer will install a "level spreader' on the proposed Sunrise Springs side of <br />Sunrise Road. This is a low profile, unobtrusive minimum disturbance designed to redirect <br />storm water out into the woods as sheet flow rather than concentrate and channelize in the <br />drainage way. After the stormwater leaves the site, it will eventually reach an existing 30- <br />inch pipe under Sunrise road that naturally discharges to a property owned by Mr. AI <br />Dodson. <br />The developer will pay for and install an energy dissipater consisting of Rip Rap stone on <br />Mr. Dodsons side of Sunrise road. This is designed to reduce the velocity of stormwater <br />being discharged via the pipe to a flow rate that a vegetated (grassed) swale/trapezoid <br />channel can convey across Mr. Dodsons properly. A Rip Rap apron design by Phil Post <br />and Associates is attached. <br />The swale/trapezoid channel is Mr. Dodsons responsibility and he intends to conduct this <br />work to correct existing drainage, problems on his lots. This office has prepared five <br />channel designs of various widths and depths capable of handling the full flow of the pipe <br />once the energy dissipater is installed. Calculations for trapezoidal channels are attached. <br />75 <br />G:\Ivins\carrespondence\memotocraig <br />