Agenda - 08-18-1987 - Laserfiche WebLink

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29 Mr. Grey Szymik August 11 , 1987 Page 2 3. Primary drainage is in a westerly direction to a natural channel flowing to the north and eventually crossing under the railroad downstream of the subdivision . The channel section is poorly defined and has a number of trees growing within the expected wetted perimeter . This channel would also receive the drainage from the proposed expansion of the subdivision . Given the present condition and limited carrying capacity of the channel , we anticipate that some channel improvements will be necessary to relieve the existing problems as well as providing capacity for expansion of the development. Subject to your concurrence , we propose the following scope of service : 1 . Investigate and develop recommendations for correction of the existing drainage problems cited in the June 12 , 1987 memorandum from Marvin E . Collins to the Orange County Board of Commissioners . A copy of this memorandum is attached and is made part of our proposal . We have indicated specific items in the memorandum that we propose to address . 2 . Determine the expected impacts of the proposed development on the existing natural drainage channel . We will determine the peak runoff rates from the existing developed area and the estimated runoff rates from the proposed areas based on the recommended zoning densities . A backwater curve will be prepared based on the hydraulic capacity of the existing culvert( s ) beneath the railroad. The recommended cross section will be determined for the drainage channel at appropriate points within the subdivision. 3 . Preparation of a written report detailing our method of investigation and summarizing any recommended improvements . We envision that this report will be presented orally to the County Commissioners . We will be available to respond to staff questions concerning the recommendations in our report.