Laserfiche WebLink
3) In places where low water crossings must outlet on a potentially <br /> unstable fill slope, large durable rock will be placed at the <br /> outlet to the fill slope, if possible . <br /> 4) The decisions for placement of low water crossings must be based <br /> on maximum hydrologic stability . If long stretches occur without a <br /> crossing , large flows will build up in the inside ditch and will be <br /> increasingly difficult to pass to the fill slope without problems . <br /> on the other hand, some areas will not accept a concentrated flow <br /> on the fill slope without erosion. These choices must be made in <br /> the field based on the hydrologic basins upstream and downstream, <br /> the nature of the natural drainages and the fill slopes , the road <br /> slopes and other factors . <br /> 6) In places where a low water crossing is desired and there is no <br /> need to backfill the cut material against an unstable cut slope, <br /> the material can still be placed against the cut slope, which will <br /> allow reclamation which more closely approaches the original <br /> contour . <br /> 7) Wherever gullies exist at culvert outlets , a reasonable attempt <br /> will be made at remediation. If an existing culvert outlet will be <br /> replaced by sheet flow across the road surface, the gully will be <br /> regraded by equipment if the slope allows . If it is too steep, <br /> slashed timber pieces will be lodged in the gully to help heal it <br /> naturally . In gullies at culvert outlets that will not be converted <br /> to sheet flow, slashed timber will also be placed in these to the <br /> extent reasonably possible. <br />