Laserfiche WebLink
DIVERSION DITCH DESIGN SPECIFICATIONS <br /> MINIMUM DIMENSIONS 2, 3, 4 <br /> PEAK PEAK INVERT TOP X-SECT. RIPRAP 5 <br /> POND DITCHI DISCHARGE SLOPE VELOCITY DEPTH WIDTH WIDTH AREA DIAMETER <br /> NO. SECTION cfs ft./ft. . (fps) feet feet feet s .ft. inches <br /> 1 1-A 175 .01 6.3 3. 5 5 15. 5 36 ------- <br /> 2 2-A 29 .034 6.2 2. 5 3 10. 5 17 1 .5-12 <br /> 2 2-B 29 .18 10 2. 5 3 10. 5 17 1 .5-12 <br /> 3 3-A 160 .15 14 3. 5 7 17. 5 43 1 . 5-18 <br /> 3 3-B 160 . 05 9.6 4 7 19 52 1 . 5-18 <br /> 3 3-C 110 . 01 5. 6 3. 5 5 15. 5 36 ------- <br /> 3 3-D 150 . 01 6 4 5 17 44 ------- <br /> 4 4-A 580 . 30 24 5 13 28 103 1 . 5-18 <br /> 4 4-B 430 .18 14 5 8 23 78 1 .5-18 <br /> 4 4-C 430 . 01 8 5. 5 8 24.5 88 ------- <br /> 4 4-D 870 . 01 9.8 7 12 33 158 ------- <br /> 4 4-E 870 . 17 23 6 13 31 132 1 .5-18 <br /> NOTES: 1 . Refer to sheet S-3 for ditch section locations. <br /> 2. Trapezoidal ditch with side slopes of 1 .5 horizontal to 1 vertical . <br /> co 3. Dimensions include the design flow depth, design freeboard, and the average thickness of riprap <br /> m liner where required. <br /> 4. n = 0.04, assumed coefficient of roughness for riprap lined ditch; n = 0.035 assumed for ditches <br /> without riprap. <br /> 5. Up to 40% of the riprap pieces should be smaller than the maximum size listed. <br />