Standard for riprap and conduit outlet protection
description
Transcript of Standard for riprap and conduit outlet protection
![Page 1: Standard for riprap and conduit outlet protection](https://reader035.fdocuments.net/reader035/viewer/2022062323/56816727550346895ddbbf27/html5/thumbnails/1.jpg)
STANDARD FOR RIPRAP AND CONDUIT OUTLET PROTECTION
![Page 2: Standard for riprap and conduit outlet protection](https://reader035.fdocuments.net/reader035/viewer/2022062323/56816727550346895ddbbf27/html5/thumbnails/2.jpg)
HOW MUCH OF A DIFFERENCE DOES THIS CHANGE MAKE ?
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 = 0.020 x q1.33 =0.020 x 10.001.33 = 1.069 ft.
TW 0.40 ft.
1.069 ft. = 1.25 = 25% Increase in D50
0.855 ft.
![Page 3: Standard for riprap and conduit outlet protection](https://reader035.fdocuments.net/reader035/viewer/2022062323/56816727550346895ddbbf27/html5/thumbnails/3.jpg)
PREFORMED SCOUR HOLE SECTION HAS BEEN REARRANGED TO “FLOW” MORE LOGICALLY
![Page 4: Standard for riprap and conduit outlet protection](https://reader035.fdocuments.net/reader035/viewer/2022062323/56816727550346895ddbbf27/html5/thumbnails/4.jpg)
HORIZONTAL APRON SECTION HAS BEEN REARRANGED TO “FLOW” MORE LOGICALLY
DO0.5
![Page 5: Standard for riprap and conduit outlet protection](https://reader035.fdocuments.net/reader035/viewer/2022062323/56816727550346895ddbbf27/html5/thumbnails/5.jpg)
ISHBASH CURVE – CHANNEL RIPRAP
![Page 6: Standard for riprap and conduit outlet protection](https://reader035.fdocuments.net/reader035/viewer/2022062323/56816727550346895ddbbf27/html5/thumbnails/6.jpg)
ISHBASH EQUATION
Vc is not the velocity correlated with Minimum Specific Energy !
![Page 7: Standard for riprap and conduit outlet protection](https://reader035.fdocuments.net/reader035/viewer/2022062323/56816727550346895ddbbf27/html5/thumbnails/7.jpg)
FIGURE TS14C–6 GRAPHICAL SOLUTION FOR ISBASH TECHNIQUE FOR DIFFERENT STONE
DENSITY
![Page 8: Standard for riprap and conduit outlet protection](https://reader035.fdocuments.net/reader035/viewer/2022062323/56816727550346895ddbbf27/html5/thumbnails/8.jpg)
DIFFERENT STONE DENSITY
![Page 9: Standard for riprap and conduit outlet protection](https://reader035.fdocuments.net/reader035/viewer/2022062323/56816727550346895ddbbf27/html5/thumbnails/9.jpg)
AVAILABLE FOR VERY HIGH VELOCITY CIRCUMSTANCES
![Page 10: Standard for riprap and conduit outlet protection](https://reader035.fdocuments.net/reader035/viewer/2022062323/56816727550346895ddbbf27/html5/thumbnails/10.jpg)
LANE METHOD – CHANNEL RIPRAP
![Page 11: Standard for riprap and conduit outlet protection](https://reader035.fdocuments.net/reader035/viewer/2022062323/56816727550346895ddbbf27/html5/thumbnails/11.jpg)
RIPRAP QUESTIONS ?