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<br />v-4 <br /> <br />d. The hydraulic grade line sha"1 be maintained below the ground <br />surface. <br /> <br />7. Irrigation Ditches. All existin<1 irr-igation ditches and laterals <br />wi II be provided for. Use on-grade flumes where feasible to reduce <br />silt and maintenance problems. Capacity of crossings will be limited <br />to cause storm runoff in ditche~, to enter waterways. Irrigation <br />ditch crossings wi 11 be designed to obviate picking up of overflow <br />from waterways. <br /> <br />8. Drops and Checks. Channel drops wi 11 be used as needed to control <br />the hydraulic grade line and velocity to within reasonable slopes <br />and limits. Drops wi 11 be of concrete, riprap, or riprap in gabions; <br />be of pleasing appearance; have gravel filter blankets under the rock <br />to control undercutting; and be properly notched for the trickle chan- <br />nel. Design must account for potential vandalism" Checks will be <br />end-protected to eliminate side cutting. <br /> <br />9. Energy Dissipators. These will usually consist of natural rock impact <br />blocks with suitable riprap or gabion pmtected bottom and siele slopes. <br />Design wi II account for potential vandalism. <br /> <br />10. Flood Plain Definition. Natura"j waterways havin<J adequate capacity <br />for the design runoff wi II be flood-plain zoned to protect their <br />capacity from encroachment based on future flows. <br /> <br />11. Detention Storage. Storage will be utilized wherever practical to <br />reduce peak flow rates. <br /> <br />12. Sedimentation. The design criteria anticipate the regular removal of <br />sediment and debris from the basins for use as construction materials <br />and for solid waste disposal cover material" <br /> <br />Care shall be taken to design ponds with flood routing procedures <br />and adequate emergency spillways. <br /> <br />13. Multiple Use. The master planning of the wate~'aY5 wi 11 be done in <br />a manner compatible with the fol'jowing multiple useS and auxi II iary <br />benefits. See Section VI I. <br /> <br />a. Greenbelt and urban open space <br /> <br />b. Lowered ground water table <br /> <br />c. Controlled rising ground water table after urbanization <br /> <br />d. Reduced street maintenance costs <br /> <br />e. Reduced street construction costs <br />