Laserfiche WebLink
• <br />TEN-YEA.°„ 24-HOUn DESIi,'J STO^1i <br />The require.~~ent for co^puting the 10-year, 24-hour storm originates <br />with PL 95-E7 regulations pertaining to settling pond storage capacity. <br />Funnff from this design store was computed for Orchard Valley t•:ine. The <br />theoretical basis has been discussed in considerable detail in Appendix II <br />and Appendir. V-A of letters submitted to h1r. Jerry NcPhee, C'.;I, on <br />February 19 and February 27, 197E (Leaf, 1973a and Leaf, 197Eb, respectively). <br />Plate II shows the proposed system of se*.tling ponds developed from <br />the 10-year, 24-hour storm analysis, and from the evaluation of on-site <br />erosion control effectiveness and sediment yield--also discussed in some <br />detail by Leaf (197Ea). <br />As noted by Leaf (197°a}, efficient use of buffer strips v+ill minimize <br />• <br />the direct introduction of sediment from disturbed areas into natural <br />channels. Storm runoff from nodes 1, 7, and 10 will be released on <br />in-sloped heavi',y riprapped contour benches. Depression storage will be <br />sufficient to contain runoff from minor storm events. Higher flov+s v+ill be <br />spilled across the full length of each bench, thus avoiding concentration <br />of flo~:~s on Lhe slope. All storm runoff released frc^ disturbed areas <br />will be routed through the settling ponds. <br />• <br />