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in each ditch. Culverts and ditches will typically be • <br />designed using SIDCAD+ to predict the peak runoff arri <br />Mannirrg's equation to determine the peak velocity aryl flow <br />depth. <br />If the ditch is not stable, then a larger ditch section will <br />be used and/or adequately line the ditch in order to o~mq~ly <br />with applicable regulations. <br />Drainage from access roads within the areas disturbed by <br />minim arxi reclamation activities (see ESd7ibit 12-1) will be <br />constructed to meet the requirements of 4.05.2 and such access <br />roads will at a miniTmim be constructed and maintained to <br />minimize erosion of the disturbed area. ES.rosion control <br />measures to be used singly or in combination include but are <br />not limited to: <br />a. Stabilizing all exposed surface areas to pt~nnote a <br />reduction in the rate and volume of runoff; • <br />b. Using straw dikes, riprap, check dams, berms, geotextile <br />materials, mulches, v~etation sediment filters, contour <br />furtvws or other measures that reduce overland flow <br />velocity, reduce runoff volume, or trap sediment; or <br />c. Such other measures to minimize erosion resultant <br />siltation and disturbance to the prevailing hydrological <br />balance. <br />4.03.2 (4)(e)CUlverts. Each acrnss road will be designed, constructed, <br />and maintained to have adequate drainage using ditches and <br />culverts to safely convey the peak runoff from a 10-year, <br />24-hour precipitation event to sediment ponds before being <br />released from the permitted area (see bdribit 7-14 for typical <br />details of drainage structures) . <br />0.rlverts will be instal led to avoid plugging or collapse arri <br />to avid erosion at the inlets and outlets. Riprap will be • <br />12-37f Revised 12/10/92 <br />