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Inspections of the terrace ditches, and open flumes should be conducted on a quarterly <br />basis and after a major storm event (four inches or more). Maintenance consists of the <br />repair of erosion near the riser inlet structure and removal of sediment accumulation <br />near the entrance area from the sideslope ditches to the flume and closed conduit <br />letdowns. <br />Inspections should also be conducted at the terminal end of the Segment 1 letdown <br />pipes at the lined energy dissipation area in the bottom ditch. The bottom ditch lining <br />should be checked for undermining, settlement, and structural integrity. Inspection <br />should be done quarterly and after a four -inch rain event. Appropriate repairs should <br />be implemented as needed. The energy dissipation area of the ditch should also be <br />checked for sediment, especially if there is evidence of slope erosion, washout, or soil <br />sloughing on the upper slopes or terraces. Maintenance of the infill segment interim <br />and permanent stormwater management systems is discussed earlier under "Infill <br />Segment Modifications to Existing Stormwater Systems." <br />