Forest Road Engineering Guidebook - Ministry of Forests
Forest Road Engineering Guidebook - Ministry of Forests
Forest Road Engineering Guidebook - Ministry of Forests
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<strong>Forest</strong> <strong>Road</strong> <strong>Engineering</strong> <strong>Guidebook</strong><br />
<strong>Road</strong> pr<strong>of</strong>ile (stream cross-section)<br />
Note: <strong>Road</strong> pr<strong>of</strong>ile must have sufficient depth to ensure<br />
stream flows cannot breach the ford and run<br />
down the road or ditch.<br />
Figure 21. Plan and pr<strong>of</strong>ile <strong>of</strong> a ford crossing.<br />
118<br />
Erosionresistant<br />
apron<br />
<strong>Road</strong> cross-section (stream pr<strong>of</strong>ile)<br />
Stream<br />
Upslope catchment<br />
basin (optional)<br />
Wetted perimeter at Q 100 peak flow<br />
Clean shot rock,<br />
cobbles or other nonerodible<br />
material<br />
Water level for<br />
Q 100 flows<br />
Water level for<br />
Q 100 flows<br />
Erosionresistant<br />
apron<br />
Low-flow culvert (optional)<br />
<strong>Road</strong> subgrade width<br />
Outslope 2–3%<br />
<strong>Road</strong> surface<br />
Shot rock, cobbles, or boulders purposely positioned to<br />
permit water to percolate through voids<br />
Low-flow culvert<br />
(optional)<br />
Stream
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