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Field Analysis

Flow Measurement

Data required for calculation of flow rate includes length, width, and depth of the river channel; measures of the actual physical characteristics of the water body. For a river “reach” (a defined segment of river), these measurements, along with velocity, are required to calculate volume and flow rate of the river. The USGS is the agency most actively involved with flow measurement in the watershed, with the intent of obtaining reproducible and comparable measurements from the many locations for which measurements are made.

Measurements of the river stage (depth in feet) and flow rate (cubic feet per second) have been continuously collected by the USGS and other interested parties at strategic locations along the entire length of the Truckee River for many years. There are currently 13 stations collecting real-time data on the main stem of the Truckee River between Tahoe City (Lake Tahoe) and Pyramid Lake. The stations, river mile, and geographic locations, are listed in Table 4-4. A hyperlink is enabled from the sites listed in the table for immediate access to the data, including period of record and current conditions. For scientific studies, these measurements are integrally paired with other physical and chemical parameters measured for water quality modeling or other purposes. UNR also collects this type of data during their investigations to supplement their collected information. TMWC collects flow data when taking quarterly water quality samples, either using a hand flow meter, or with an in-stream gauge. To capture storm hydrograph conditions, the TMWC collects flow data using transducers and gauging stations where available during storm event monitoring.

CMP Station number USGS No. Station Name

TR_96

10337500

Truckee River at Tahoe City, CA

TR_97

10338000

Truckee River near Truckee, CA

TR_110

10344505

Truckee River at Boca Bridge near Truckee, CA

TR_111

10346000

Truckee River at Farad, CA

TR_113

10347460

TTruckee River near Mogul, NV

TR_115

10348000

Truckee River at Reno, NV

TR_116

10348200

Truckee River near Sparks, NV

TR_123

10350000

Truckee River at Vista, NV

TR_124

10350340

Truckee River near Tracy, NV

TR_126

10351600

Truckee River below Derby Dam near Wadsworth, NV

TR_127

10351650

Truckee River at Wadsworth, NV

TR_128

10351700

Truckee River near Nixon, NV