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Photo 7.6 Armor ditches with vegetation, rock, masonry, or concrete to<br />
resist ditch erosion and carry the water to a stable exit point.<br />
Figur<br />
igure e 7.6 Typical drop inlet structure types (with culvert cross-drains).<br />
Use drop inlet structure to control the level <strong>of</strong> water,<br />
turn water into the pipe, and prevent downcutting and erosion <strong>of</strong> the ditch.<br />
Roadbed surface<br />
Grass for<br />
Erosion<br />
Control<br />
Energy<br />
Dissipation<br />
with Riprap,<br />
Concrete<br />
Apron or<br />
Splash pool<br />
with water<br />
General Information<br />
Bottom <strong>of</strong> ditch<br />
Roadbed Surface<br />
Slope<br />
45 cm<br />
Slope<br />
30 cm<br />
Window<br />
45 cm<br />
"1 m<br />
Drop inlet<br />
structure<br />
Culvert Pipe (30-60 cm diameter)<br />
Sand trap<br />
30 cm<br />
0.6-1.2 m<br />
Masonry<br />
LOW-VOLUME ROADS BMPS:62<br />
Design and Installation Detail<br />
90 cm<br />
Metal
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