Chapter 7 Drainage of Low-Volume Roads

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Figur igure 7.3 Rolling (broad-based) dip cross-drains. Mound Inslope or Outslope Spacing 30 - 150 m 0-25 o Riprap at Dip Exit Armored Dip a. Perspective View Dip Dip Average Road Grade 2-5% Outslope 2-5% Outslope b. Profile Armor Dip and Mound Surface as Needed with 5-15 cm Aggregate For Insloped Road – Slope to Depth of Inside Ditch For Outsloped Road – 3-5 cm Deep or Match Depth of Inside Ditch at Entrance – 15-30 cm Deep at Exit Road Grade 2-12% Reverse Slope 3-6% Average Road Grade 8-30m 7-12m 8-30m c. Rolling Dip Profile Detail LOW-VOLUME ROADS BMPS:58
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ Figur igure 7.4 Culvert cross-drains. Inlet Structure as Needed Spacing 30–150 m Berm 0 o -30 o Place Outlet Pipe at Natural Ground Level or Riprap Armor the Fill Material. Figur igure e 7.5 Water bar construction. (Adapted from Wisonsin’s Forestry Best Management Practices for Water Quality. 1995, Publication FR093, Wisconsin Department of Natural Resources) Berm Tied into Embankment Spacing 10–75 m 0-25 o Exit onto Stable or Armored Ground a. Perspective View 30-60 cm 30-60 cm Road Grade 1 - 2 m 1 - 2 m 1 - 2 m b. Cross-Section LOW-VOLUME ROADS BMPS : 59
Page 1 and 2: Chapter 7 Draina ainage of Low-Volu
Page 3 and 4: Table 7.1 Recommended Maximum Dista
Page 5: • Long sustained road grades that
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 and 16: Figur igure 7.10 Natural drainage c
Page 17 and 18: Figur igure 7.11 (continued) Good I
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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