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1997. Sediment deposition resulting from heavy storm runoff <br />had filled in the ditch and the ditch had overtopped. During <br />the special focus inspection, a segment of this ditch some <br />distance above the measured section (between Terrace Drain #2 <br />and Terrace Drain #3) had been identified as needing cleanout, <br />and the cleanout had in fact been completed prior to DMG <br />inspection of August e. Riprap replacement had been completed <br />prior to DMG inspection of September 29, 1997. <br />Roadside Refuse Disposal Area Diversion and Collection Ditches <br />Permit Exhibit 20 approved designs for RSRDA Ditches: <br />Catch Ditch 1 (SS)--"V" Ditch 1.3' d, 2.5' tw. <br />Catch Ditch 2 (W)--"V" Ditch 2.05' d, 4' tw. <br />South Diversion Ditch (TT)--"V" Ditch 2.5' deep, 8.8' tw. <br />Field measurements indicated ditch capacities did not meet <br />approved design within various locations near lower end and <br />upper end of South Diversion, and along Lower Catch Ditch No. <br />2. SEDCAD evaluation indicated that two of the South <br />Diversion Segments would not pass the design flow with <br />required freeboard. These ditch segments will need to be <br />regraded as necessary to comply with approved design by <br />December 1, 1997. Ditch segments which will pass the design <br />flow but do not comply with approved permit designs need to be <br />regraded to comply with the permit or permit designs will need <br />to be appropriately modified by the same date. <br />DM#15. Just above terminus at lower end of South Diversion <br />Ditch. "V" Ditch 8' tw, 1.25' d, 2-3% slope, 60% grass cover. <br />Ditch capacity is less than specified in approved design, and <br />SEDCAD evaluation indicates ditch capacity would not pass <br />design flow with required freeboard. <br />DM#16. Approximately 100' east of DM#15;--South Diversion <br />Ditch. "V" Ditch 17' tw, 1.2' d, 2-3% slope, 60% grass cover. <br />Ditch capacity is somewhat less than approved design, however <br />SEDCAD evaluation indicates ditch would pass design flow with <br />required freeboard. <br />DM#17. South Diversion Ditch immediately below lower 18" <br />culvert. "V" Ditch 13' tw, 1.8' d, 2-3% slope, 60% grass <br />cover. Ditch capacity exceeds approved design and SEDCAD <br />evaluation indicates ditch would pass design flow with <br />required freeboard. <br />DM#18. Upper end South Diversion Ditch approximately 60 feet <br />below origin. "V" ditch 10.5' tw, 1.3' d. 2-3% slope, 60% <br />grass cover. Ditch capacity is less than approved design, and <br />SEDCAD evaluation indicates that ditch would not pass design <br />flow with required freeboard. <br />7 <br />