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Standard for riprap and conduit outlet protection

Standard for riprap and conduit outlet protection. Lets look at an example: Q 25 = 20.00 cfs, W O = 24 Inch or 2.00 ft. T W = 0.2 x D O =0.2 x 2.0 ft.= 0.40 ft., q =20.00 cfs / 2.00 ft. = 10.00 sfs

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Standard for riprap and conduit outlet protection

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  1. Standard for riprap and conduit outlet protection

  2. Lets look at an example: Q25 = 20.00 cfs, WO = 24 Inch or 2.00 ft. TW = 0.2 x DO =0.2 x 2.0 ft.= 0.40 ft., q =20.00 cfs / 2.00 ft. = 10.00 sfs Old Equation: D50 = 0.016 x q1.33 =0.016 x 10.001.33 = 0.855 ft. TW 0.40 ft. New Equation: D50 = 0.020x q1.33 =0.020x 10.001.33 = 1.069 ft. TW 0.40 ft. 1.069 ft. = 1.25 = 25% Increase in D50 0.855 ft. How much of a difference does this change make ?

  3. Preformed scour hole section has been rearranged to “flow” more logically

  4. Horizontal apron section has been rearranged to “flow” more logically DO 0.5

  5. Ishbash curve – channel riprap

  6. Ishbash equation Vc is not the velocity correlated with Minimum Specific Energy !

  7. Figure TS14C–6 Graphical solution for Isbash technique for different stone density

  8. Different stone density

  9. Available for very high velocity circumstances

  10. Lane method – channel riprap

  11. Riprap questions ?

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