1996
DOI: 10.1111/j.1752-1688.1996.tb03459.x
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PREDICTING DOWNSLOPE TRAVEL OF GRANITIC SEDIMENTS FROM FOREST ROADS IN IDAHO1

Abstract: The length and volume of granitic sediment deposits were measured annually over a 4.5-year period below 6.6 km of forest roads constructed on headwater watersheds in the mountains of Idaho. Sediment deposits were identified by source of runoff, location of the deposit terminus, and various site factors including descriptors of hillside sediment storage capacity. Prediction equations were developed using linear regression for travel distance of sediment originating from fill slopes, rock drains, and culverts, w… Show more

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Cited by 49 publications
(48 citation statements)
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“…Within 1 or 2 years after the fires, some of the study streams experienced a massive scouring, erosion, and redeposition of bed materials (Benda et al 2003), removing much of the belowground vegetative structures. Consequently, streams like these may be prone to substrate-scouring events at moderate levels of precipitation (Megahan 1983, Megahan andKetcheson 1996). In turn, this continued scouring could further delay riparian recovery.…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…Within 1 or 2 years after the fires, some of the study streams experienced a massive scouring, erosion, and redeposition of bed materials (Benda et al 2003), removing much of the belowground vegetative structures. Consequently, streams like these may be prone to substrate-scouring events at moderate levels of precipitation (Megahan 1983, Megahan andKetcheson 1996). In turn, this continued scouring could further delay riparian recovery.…”
Section: Discussionmentioning
confidence: 99%
“…The bedrock substrate in the basin is dominated by moderate to well-weathered coarse-grained quartz monzonite typical of much of the Idaho batholith. Soils are lithosols with weakly developed A horizons ranging from 5 to 25 cm thick (Megahan and Ketcheson 1996). These granitic, droughty soils have limited fertility and are highly erodible when vegetation is removed (McGarth et al 2001).…”
Section: Study Areamentioning
confidence: 99%
“…From this data, there is no clear threshold of length and slope beyond which erosion will become unacceptable, so the decision must be based on other information. Megahan and Ketcheson [1996] show that runoff leaving the road prism at concentrated points, such as cross-drains, is more likely to deliver sediment to streams than diffuse drainage. Montgomery [1994] argues that concentration of drainage by roads is the primary reason for gully development and landsliding below roads.…”
Section: How the Relationship Between Length Slope And Sediment Promentioning
confidence: 99%
“…Montgomery [1994] recommends limiting road segment length based on slope of the hillside to which the segment drains. Megahan and Ketcheson [1996] suggest spacing to limit delivery distance across hillslopes above streams.…”
Section: How the Relationship Between Length Slope And Sediment Promentioning
confidence: 99%
“…These BMPs reduce flow velocity and thus promote settling of sediment, and include methods such as hay bales, sediment traps, check dams, and settling ponds (Anderson, 1994). Road drainage improvements (Type II) may also be viewed as attempts to reduce the downstream transport of eroded sediment as adequate placement of road drainage structures also promotes reduced connectivity with downslope water bodies (Megahan and Ketcheson, 1996;Croke et al, 2005).…”
Section: Best Management Practicesmentioning
confidence: 99%