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- W2247296068 abstract "We have ongoing sediment-budget studies in two parts of the Kootenays: at Redfish-Laird creeks in the West Arm Demonstration Forest, and at Gold Creek, one of the community watersheds of the City of Cranbrook. In addition, a number of watersheds have had monitoring programs that provide some sediment-budget information for 1 or more years. The Redfish-Laird study began in 1993. Results show that April–September sediment yields for each year in Redfish Creek, which is developed with roads and logging, ranged from 25% greater than to double the yields for Laird Creek, the control. Most of the difference is probably attributable to erosion from roads, and to a lesser extent, to road-related landslides that occurred before the study began. Road-maintenance activities can contribute significantly to sediment production. Contributions of sediment from cutblocks were insignificant. The study in Gold Creek, which began in 1998, has so far shown much lower development-related sediment inputs to the creeks than in Redfish Creek. This is apparently due to a fundamental difference between the two areas in runoff generation mechanism. At Gold Creek, most of the snowmelt runoff from upland areas appears to enter fractured bedrock, and reach the creek through groundwater flow. This results in a low connectivity between sources of eroded sediment and the creek. In contrast, the hydrograph of Redfish Creek is dominated by surface runoff, and the sediment deliverability from roads to the creek is higher. In 1997, we monitored suspended sediment production on 11 creeks used for community and domestic water supply. Watersheds underlain by granitic rocks tended to have the lowest average sediment yield; otherwise, there was little apparent relation between sediment yield and bedrock geology or extent of development. In general, sediment yield from most creeks used for water supply was quite low compared to typical yields elsewhere in British Columbia. A sampling strategy of daily manual sampling during the spring freshet, and less frequent sampling for the rest of the year, has been found effective both for measuring total sediment yield and for monitoring water quality. Recording turbidity meters provide additional useful information." @default.
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- W2247296068 date "2000-01-01" @default.
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- W2247296068 title "Sediment budgets in the Nelson Forest Region." @default.
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