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Evaluation of Effectivenns of Three Types of Highway Alignment Best Management Practices for Sediment and Nutrient Control.
| 题名： | Evaluation of Effectivenns of Three Types of Highway Alignment Best Management Practices for Sediment and Nutrient Control. |
| 作者： | GUNTER, M.; JONES, T.; MIHEVC, T.; THOMAS, J. |
| 关键词： | *Best-management-practices; *Sediment-control; *Nutrient-control.;Highway-runoff; Efficiency-; Sediments-; Nutrients-; Inflow-; Outflow-; Erosion-control; Stormwater-management; Effectiveness-. |
| 摘要： | Lake Tahoe is renowned for its natural beauty. Regrettably, water clarity is declining at a rate of approximately 1 foot per year. This degradation has been attributed in part to nonpoint pollution sources including highway runoff. In response to regulatory requirements of the Tahoe Regional Planning Agency, the Nevada Department of Transportation (NDOT) developed the NDOT Lake Tahoe Master Plan for Erosion Control and Stormwater Mangement. Retrofitting of 39 miles of NODT roadways with various types of best management practices is a major portion of $100 million of improvements. This research evaluates the efficiency of three types of highway alignment BMPs installed during the first phase of the NDOT Master Plan. A sediment trap, sediment basin and Stormceptor (trademark) were evaluated for nutrient and suspended sediment removal efficiency. Problems with flow sensors prevented efficiency calculations for the sediment basin. Concentration values did indicate some level of treatment however. The sediment trap removed 51 percent, 42 percent, and 32 percent of TSS, TP and TN respectively, although statistical analysis showed no difference between inflow and outflow. The Stormceptor (trademark) provided 31 percent, 25 percent, and 21 percent nutrient removal rates respectively for TSS, TP and TN with statically significant differences between inflow and outflow. |
| 报告类型： | 科技报告 |
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