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Step 5. Allt <br />The <br />forr <br />Step 6. Design Sto. m <br />In most cases, detention facilities must be designed for a 10-year or 2-5- <br />year storm. For developments in the area served by the combined sewer <br />system (Area A on Figure 3) a 10-year rsign storm will normally be required. <br />In all o%her areas of the City, a 25-year design storm will be required. <br />In extremely sensitive areas, a 50 or 100 year design storm may be required. <br />Step 7. Storage Volume, VT <br />The amount of storage required is the difference between the volume <br />of water released from the detention facility and the volume of runoff <br />discharged into the facility from the time runoff begins until the inflow <br />rate equal Qallow. <br />This volume is represented qualitatively by the cross -hatched area shown <br />on the sketch below and deter mined by the following equation: VT = %,5 A Cdev <br />Where VS is determined by us.-! of Table 2 and C <br />dev by Table 1. <br />rou, Rafe <br />(it <br />r,me (^n) <br />ouf%w <br />