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Exh. 7-23G-2 Revision Date: 4/28/22 <br /> Revision No.: TR-154 <br />Finally, a conservative 300 foot wide by 1,000 foot long disturbed area of 6.89 acres was modeled <br />with a curve number of 85. This produced a flow in the 10 year 24 hour storm of 5.02 cfs <br />distributed along the 1,000 foot boundary with the down-gradient grass filter. This model was run <br />with the grass filter sloping at 50%, and thus should be considered the most severe application of <br />this approach. The first 20 feet of flow through the grass filter reduced the 24 hour weighted <br />settleable solids to 0.35 ml/l, which satisfies the 0.5 ml/l standard. This grass filter has a trap <br />efficiency of 80.4 %. <br /> <br />References <br />1) Applied Hydrology and Sedimentology for Disturbed Areas, Barfield, Warner and Haan, <br />1981 <br />