Chapter 7 Drainage of Low-Volume Roads

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Figur igure 7.11 Culvert Installed with Protection using an Armored Overflow Dip to Prevent Washout and Fill Failure A B C D (A) Roadway Cross Drain (Dip) (B) Culvert (C) Overflow Protection Dip (D) High point in the road profile A Road Profile Across the Drainage and Dip Fill B D C Armored dip Pipe a. Overflow dip protection at a fill stream crossing. (Adapted from Weaver and Hagans, 1994) LOW-VOLUME ROADS BMPS:68
Figur igure 7.11 (continued) Good Installation b. Armored dip over a low fill to prevent stream diversion. Poor Installation c. Sketch of a stream diverted down the road, forming a new channel. Plugged Culvert Abandoned Channel Slumping New Channel in a Gully d. Consequence of stream diversion out of its natural channel. (Adapted from M. Furniss, 1997) LOW-VOLUME ROADS BMPS : 69
Page 1 and 2: Chapter 7 Draina ainage of Low-Volu
Page 3 and 4: Table 7.1 Recommended Maximum Dista
Page 5 and 6: • Long sustained road grades that
Page 7 and 8: ○ ○ ○ ○ ○ ○ ○ ○ ○
Page 9 and 10: slow down the velocity of water, as
Page 11 and 12: Figur igure 7.7 Culvert outlet prot
Page 13 and 14: NATURAL STREAM CROSSINGS Road cross
Page 15: Figur igure 7.10 Natural drainage c
Page 19 and 20: WET AREAS AND MEADOW CROSSINGS, USE
Page 21 and 22: Figur igure 7.15 Pole or plastic pi

Chapter 7 Drainage of Low-Volume Roads

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