Draft St. Regis Watershed Total Maximum Daily Loads And Framework Water Quality Restoration Assessment [electronic Resource] : Sediment And Temperature Tmdls : Public Comment Draft 2007
Draft St. Regis Watershed Total Maximum Daily Loads And Framework Water Quality Restoration Assessment [electronic Resource] : Sediment And Temperature Tmdls : Public Comment Draft 2007
Montana.Dept. of Environmental Quality
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All of the sediment from eroding streambanks was determined to be the result of human impacts. It is assumed that a 90%) reduction in loading can be accomplished through a combination of BMP implementation and active restoration/stabilization. Sediment loading from potential culvert failure can be reduced by an estimated 88.5%) by upgrading all culverts to safely pass the 100 year flood. Inevitably, some risk of failure will always remain, and this risk is reflected in the remaining 40 tons/yea...r. There is no allocation to future human caused mass wasting although negligible loads from past events may persist. The sediment contribution from upland timber harvest disturbance is currently negligible, but will be provided an allocation of approximately 5% of the overall TMDL. There are no point sources of sediment in the Little Joe Creek Watershed; therefore, no waste load allocation is necessary. Table 6-lL Sediment AUocal ions and TMDL for Little Joe Creek Sources Current Estimated Load (TonsA'r) Performance Based Allocation - Change From Current Condition Estimated Sediment Load Allocations (TonsA^r) Anthropogenic Nonpoint Sources Forest Roads 43.7 -48% (-21.0 tons/year) 22.7 Eroding Banks 36.4 - 90% (- 32.8 tons/year) 3.6 Culvert Failure 344 - 88.5% (- 304.tons/year) 40 Upland Timber Harvest Negligible Up to 5% of TMDL allowed 20 Natural Background 319 Not applicable 319 Total Load 743.1 - 45.5% (-337.8 tons/year) 405.3 9/27/2007 DRAFT 89 St.
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