Example sizing information for riprap energy dissipators at culvert outlets Revision as of 19:25, 18 October 2016 by PLeegar (talk | contribs) (Created page with "<center><font size=3>'''Example sizing information for riprap energy dissipators at culvert outlets'''</font size><br> Link to this Example sizing information for riprap en...")(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff) Example sizing information for riprap energy dissipators at culvert outlets

Example sizing information for riprap energy dissipators at culvert outlets
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Culvert size	Avg. rock diameter	Apron width1	Apron length2	Apron length3
8"	3"	2–3 ft.	3–5 ft.	5–7 ft.
12"	5"	3–4 ft	4–6 ft.	8–12 ft.
18"	8"	4–6 ft.	6–8 ft.	12–18 ft.
24"	10"	6–8 ft.	8–12 ft.	18–22 ft.
30"	12"	8–10 ft.	12–14 ft.	22–28 ft.
36"	14"	10–12 ft.	14–16 ft.	28–32 ft.
42"	16"	12–14 ft.	16–18 ft.	32–38 ft.
48"	20"	14–16 ft.	18–25 ft.	38–44 ft.

• ¹Apron width at the narrow end (pipe or channel outlet)
• ²Apron length for slow-flow (no pressure head) culverts
• ³Apron length for high flow (pressure head) culverts

Source: Kentucky Division of Water