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Estimated Sediment Reduction with Forestry Best Management Practices Implementation on a Legacy Forest Road Network in the Northern Rocky Mountains
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Estimated Sediment Reduction with Forestry Best Management Practices Implementation on a Legacy Forest Road Network in the Northern Rocky Mountains
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Journal Article
Estimated Sediment Reduction with Forestry Best Management Practices Implementation on a Legacy Forest Road Network in the Northern Rocky Mountains
2018
Overview
Abstract
This study modeled changes in sediment delivery to streams in response to systematic Best Management Practice (BMP) upgrades to a 28,000 km forest road network in western Montana and northern Idaho. Key BMPs applied included installing more frequent road drainage features to disperse runoff entering streams, managing public road access to reduce the need for ongoing maintenance, increasing road surface vegetative cover, and installing supplemental filtration near streams. The Washington Road Surface Erosion Model (WARSEM), with locally validated model assumptions, was used to estimate fine sediment delivery before and after BMP upgrades. Results from 10 repeated watersheds (inventoried and modeled before and after BMPs) estimated that sediment delivery (weighted by watershed road length) was reduced by 46% (watershed range: –84% to +57%) over a 10–15-year period. Delivery rates from these watersheds were similar to an additional 22 watersheds that were inventoried after BMP upgrades had been completed. Road sediment delivery from surface erosion estimated by WARSEM in BMP-upgraded watersheds represented less than a 5% increase above background erosion rates in this region.
