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from the site without interruption. In SWB -2 through -6, water will pond against the berms <br />before evaporating and infiltrating. Table G -1 shows the stormwater basin runoff quantity versus <br />the ponding capacity against the berm in that area. <br />Table G -1 Stormwater Basin Runoff <br />Stormwater <br />Basin <br />Area <br />(acres) <br />Runoff Volume <br />(ac -ft) <br />Minimum Berm <br />Height (ft) <br />Ponding Capacity (ac -ft) <br />1 <br />2.34 <br />0.031 <br />1 <br />No ponding, runoff redirected away <br />from site. <br />2 <br />25.48 <br />0.336 <br />1 <br />0.304 <br />3 <br />8.58 <br />0.113 <br />5 <br />0.923 <br />4 <br />6.52 <br />0.086 <br />5 <br />0.432 <br />5 <br />1.04 <br />0.014 <br />5 <br />0.393 <br />6 <br />10.67 <br />0.141 <br />5 <br />0.298 <br />7 <br />6.37 <br />0.084 <br />3 <br />No ponding, runoff redirected away <br />from site. <br />SWMP Area 1 <br />9.21 <br />1.07 <br />1.792 <br />SWMP Area 2 <br />23.67 <br />1.484 <br />1.551 <br />SWMP Area 3 <br />27.01 <br />3.14 <br />3 <br />81.83 <br />Note: Individual stormwater basin calculation outputs can be seen in Appendix 2. A curve number of 58 was selected based on the X soil having <br />a high water capacity and the areas uphill of the Hayden Gravel Pit being hay meadows. A curve number of 87 was used for all disturbed areas. <br />'Excess capacity is available in the ponding area of SWB -3 to the east. Runoff overflow to the west will be diverted by the one foot berm. <br />2The runoff volume for SWMP Area 2 is the 10 -YR event as opposed to the 100 -YR event everywhere else. This is because SWMP Area 2 drains <br />to a pond that has a controlled discharge. <br />Hayden Gravel Pit, May 2013 G -2 <br />