Catalog Record
Data and Report from S&T 7100 Project: Evaluation of Approaches to Determine Mixing and Assimilation of Reuse Effluent
As reuse water becomes an ever-larger component of water resource planning, issues associated with measuring and modeling the mixing and dispersion of reuse water will become more prominent. Hydrodynamic modeling and tracer studies are required to evaluate and assess risks for indirect potable reuse (IPR) by surface water augmentation (SWA) projects, but technical approaches vary based on locality, reservoir configuration and available information, models used, and local and state regulations. This project included a tracer case study and hydrodynamic modeling of Lake Arrowhead, which was used to develop a guidance manual. The guidance manual provides recommendations to help utilities plan and conduct hydrodynamic modeling and tracer studies for their reservoirs as part of the SWA-IPR evaluation process.
Generation Effort
S&T Project 7100: Evaluation of Approaches to Determine Mixing and Assimilation of Reuse Effluent
Location
Lake Arrowhead and Dam
Themes
Water
Reclamation Project
Reclamation Program
Science and Technology Program
Location Information
Location Name
Lake Arrowhead and Dam
Location Description
Lake Arrowhead and its dam, located in the San Bernardino National Forest in San Bernardino County, are on Little Bear Creek about 30 miles northeast of Fontana and about 65 miles northeast of Los Angeles in southern California. Lake Arrowhead was formally known as Lake Little Bear with initial development in the 1890’s to provide a diverted water supply for the San Bernardino area. These diversions never materialized and the completed reservoir was renamed Lake Arrowhead, becoming a resort community. The recreational use of the reservoir is controlled by the Arrowhead Lake Association (ALA). The Lake Arrowhead Community Services District (LACSD) withdraws water from the reservoir for treatment and distribution to local residents for potable use.
Location Parent
State(s)
California
Unified Region(s)
Lower Colorado Basin
Timezone
PT
Elevation
5,136 ft
Vertical Datum
EGM96
Coordinates (lat, long)
(34.258, -117.1841)
Horizontal Datum
WGS84
