Differences

This shows you the differences between two versions of the page.

--- stone_outlet_protection [2022/05/06 11:49] – admin
+++ stone_outlet_protection [2025/09/30 15:18] (current) – admin
@@ Line 1: / Line 1: @@
-====== Stone Outlet Protection ======
+====== Stone Outlet Protection (Riprap) ======
-Stone outlet protection is designed to release water from management practices at non-erosive velocities.  An apron of angular stone is placed at the outlet to prevent erosion by dissipating the energy of water as it flows over.
+Stone outlet protection, or riprap, is designed to release water from management practices at non-erosive velocities.  An apron of angular stone is placed at the outlet to prevent erosion by dissipating the energy of water as it flows over.
 **Advantages**
@@ Line 41: / Line 41: @@
 ===Maximum Velocities for Various D<sub>50</sub> Sizes and Shapes===
-^Maximum Velocity (ft/sec)^D<sub>50</sub> Cubical (in)^D<sub>50</sub> Spherical (in)^
+^  Maximum Velocity (ft/sec)  ^  D<sub>50</sub> Cubical (in)  ^  D<sub>50</sub> Spherical (in)  ^
 |  10.8  |  12  |  14  |
 |  9.9  |  10  |  12  |
@@ Line 53: / Line 53: @@
 ===Recommended Stone Gradation===
-^Percent Passing by Weight^Diameter (in)^
+^  Percent Passing by Weight  ^  Diameter (in)  ^
 |  100  |  2 x D<sub>50</sub>  |
 |  60-85  |  1.5 x D<sub>50</sub>  |
@@ Line 59: / Line 59: @@
 |  5-20  |  0.5 x D<sub>50</sub>  |
 |  0-5  |  0.2 x D<sub>50</sub>  |
+[{{ :wiki:images:correct_riprap.jpeg?direct&600 |Correctly installed riprap at pipe outlet}}]
+[{{ :wiki:images:poorly_installed_riprap.jpeg?direct&600 |Erosion around riprap from improper shaping}}]
 =====Construction=====
@@ Line 68: / Line 72: @@
   *The apron must be at least 1.5 feet below the invert elevation of the outlet structure
-====Stone Outlet Protection to a Flat Area (Left) and Well-Defined Channel (Right)
+**Stone Outlet Protection to a Flat Area (Left) and Well-Defined Channel (Right)**
-[[File:/Images/Stone_Outlet_Protection.PNG|Source: Adapted from the Georgia Stormwater Manual]]
+{{ :wiki:images:stone_outlet_protection.png?600 |}}
 =====Maintenance=====
@@ Line 79: / Line 83: @@
 ===References===
-  *[[https://www.nrcs.usda.gov/wps/portal/nrcs/detail/wy/technical/engineering/?cid=nrcs142p2_027269|NRCS Rock Outlet Protection Fact Sheet]]
+  *[[https://efotg.sc.egov.usda.gov/api/CPSFile/31113/468_WI_CPS_Lined_Waterway_or_Outlet_2021|NRCS Conservation Practice Standard 468 - Lined Waterway or Outlet]]