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CCP 02-10-1992
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CCP 02-10-1992
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<br />I <br />Ie pond level of 946.5 under current conditions will not require any grading of the <br /> pond. <br />I <br />I Under future developed conditions. pond A-7a must have a storage volume that <br /> will hold the runoff from the entire drainage area (A-7) while allowing a peak <br />I discharge out of the pond of 4.8 cfs. With these criteria. pond A-7a requires <br /> 1.95 acre-feet of storage for the 100 year 24 hour storm and will have a <br />I maximum pond height of elevation 947.3. The upper channel in the northwest <br />I corner of pond A-7a must be filled in and replaced with a 15" RCP pipe with <br /> an invert elevation of 945.3. An orifice plate with a 13" diameter opening is <br />I required to reduce the flow out of the pond to 4.8 cfs. The pond must also be <br /> graded to contain water up to an elevation of 947.3. However. construction of <br />I the 15" RCP storm sewer and orifice plate could be completed when the entire <br />.. drainage area of 16.67 acres is developed. <br />I The Rice Creek Watershed District is requiring that the baffled weir for <br /> pond A-7A be constructed when the 24" RC pipe is installed into the pond. <br />I The weir in pond A-7a is designed with the same requirements as the weir serving <br /> the wetland preservation area. This weir will treat the 1 year 24 hour storm <br />I water runoff for the entire drainage area of 16.67 acres. The top of the weir <br />I will be at elevation 946.10 and requires a minimum length of weir of 24 linear <br /> feet. Page 4 of the plans illustrates the details of the weir at pond A-7a and <br />I its location. The installation of the weir will require grading the channel <br /> side and bottom. The bottom of the channel under the weir should be at <br />I elevation 944.7. <br />~. <br />I <br />I <br />
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