Indicator
Phosphorus Concentration (Surface Runoff)
Basics
Phosphorus Concentration (Surface Runoff)
Phosphorus Concentration in Runoff
Outcome
Program
Each Unit (number)
WQ20: Achieve a 90 percentile concentration value for dissolved phosphorus of 0.1 milligrams/liter in surface runoff directly discharged to a surface water body in the Basin.
Milligrams of phosphorus in each liter of stormwater. The proportion of individual measurements that exceed 0.1 milligrams/liter is measured.
This Indicator is reported in the following LT Info areas:
Status

Phosphorus load reduction with the target shown in 2019 in light blue.

Name Options
Phosphorus Concentration -Stormwater
General

Program Regional Stormwater Monitoring

Approach

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.

Partners

Associated Programs data not provided.