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TERRRMRTRIX INC. ID~1-9'0-8'9-9048 MRR 29'96 1130 No .004 P.O:, <br />larger opening then the 3 inch by 3.5 inch oblong opening (approximately a 3.2 inch circular opening) <br />• wnstructed. The orifices at 6,841.4 were input as 2.5 inches. The retention time using these input <br />decant specifications was calculated at 1.4 days. The maximum retention time was determined using <br />two orifices per elevation, with the diameter ofthe orifices at 6,840.G feet specified es 3.2 inches and <br />the orifices at 6,841.4 feet specified es 2.5 inches. The maximum retention time using the <br />conservative decant specifications was calculated et 2.9 days. The calculated retention lime utilised <br />four orifices per elevation, with the orifices at t5,840.ti feet specified at 2.3 inches (which cgtratcs to <br />en equivelem opening by area to the as-built orifices) and the orifices at ti,841.4 feet specified as 2. S <br />inches. This set of decant orifice inputs resulted in a calculated retention time of ] .5 days. <br />The SEIX'AD outputs are included as an attachment to this evaluation. The results indicate that the <br />retention time for runoff from the 10-year, 24-hour design storm will be between l.4 and 2.9 days. <br />with a calculated time of 1.5 days. Thie retention time is greater than 24 hours and indicates that the <br />principal spillway as constructed, with the referenced specifications which CYCC provided to <br />TerraMatrix, will provide the necessary retention time. <br /> <br />• FJerWmk~pab_e~ga~aglcM1l Y20.96 <br />