The estimated amount of fine sediment prevented from entering Tahoe Basin urban stormwater, based on the guidelines laid out in the Lake Clarity Crediting Program Handbook. Fine sediment load is quantified in terms of the number of sediment particles with diameter of less than 16 micrometers. Reduction of fine sediment load benefits Lake Tahoe's clarity.
California Department of Transportation, City of South Lake Tahoe, Douglas County, NV, El Dorado County, CA, Nevada Department of Transportation[2 More Options]
Placer County, CA, Washoe County, NV
|Pollutant Control Type||
Road Operations, Treatment/Parcel BMPs
Program Regional Stormwater Monitoring
Monitoring is guided by the RSWMP Framework and Implementation Guidance document. During water year 2014 five catchments were monitored for continuous flow and turbidity and sampled for water quality at eleven monitoring stations: the outfalls of the five selected catchments, and the inflows to and outflows from selected BMPs located in three of those catchments. Three additional catchment outfalls were monitored in water year 2015. The catchments were chosen because of their direct hydrologic connectivity to Lake Tahoe, diversity of urban land uses, range of sizes, and a reasonably equitable distribution among the participating jurisdictions. BMP effectiveness sites were selected because of their potential efficacy in treating storm water runoff characteristic of the Lake Tahoe Basin, and the broad interest in, and lack of conclusive data regarding the efficiency of the selected BMPs in reducing runoff volumes and pollutant loads.
This indicator is related to the following Threshold Reporting Categories. Click the help icon to learn more about a Reporting Category.
Fine Sediment Load Reduction Achieved is reported as a Performance Measure in the EIP Project Tracker. Indicators used for EIP reporting are summarized in an annual report and highlighted each year during the Lake Tahoe Summit.
Catchment-scale tracking – Pollutant load reductions are tracked at the scale of a water quality catchment rather than on a project-by-project basis. This approach is in contrast to most other EIP PMs, which are tracked in relationship to specific projects. This difference in approach is necessary because the currently available Tahoe-customized load estimating tools are scaled to the catchment so that they can provide the most accurate load estimates for urban jurisdictions. Catchment-scale tracking allows reporting of accomplishments under the EIP Stormwater Management subprogram but will not allow specific action priorities (e.g. Reducing Stormwater Pollution from Local Roads) to be resolved, because of limitations in the current reporting methods. Additionally, load reductions are only tracked for the urban portion of catchments; non-urban load reductions are not currently addressed.
Fine sediment particles – Inorganic sediment particles with diameter of less than 16 micrometers
Load reduction – The difference between the estimated average annual amount of pollutants entering Lake Tahoe under standard baseline conditions (as defined in the Lake Clarity Crediting Program Handbook) and the estimated average annual amount of pollutants entering the lake under current conditions resulting from water quality improvement projects.
Urban jurisdiction – These include counties, state highway departments and cities within the Tahoe Basin
Fine sediment load reductions are tracked annually by each jurisdiction, based on information from the Annual Credit Summary generated by the Credit Accounting Platform (CAP). Load reductions are calculated at the catchment scale.
This PM tracks load reduction achieved based on actual conditions and credits awarded each year, and not on estimated load reductions anticipated in the Catchment Credit Schedule. A project is reportable to the EIP when the catchment in which it is located is registered in the Accounting and Tracking Tool according to the guidelines described in the Lake Clarity Crediting Program Handbook.
EIP Context data not provided.
Fine Sediment Load Reduction Achieved is reported in Lake Clarity Tracker. Indicators in the Lake Clarity Tracker are used to demonstrate compliance with TMDL requirements.