Dallas Lake Nutrients Study

Science Center Objects

The USGS Texas Water Science Center Nutrients Study for Dallas Water Utilities (DWU) provides discrete-depth data for nutrients, major ions, and other water-quality parameters in multiple source-water reservoirs used by DWU. The program is designed to assess nutrient and major ion occurrence, distribution, and concentration in waters by using established field and laboratory methods.

Texas Water Science Center scientists collect water-quality samples from multiple Dallas reservoirs along with basic water-quality parameters (temperature, dissolved oxygen, pH, specific conductance, Secchi depth, etc.).

The reservoirs sampled are:

  • Ray Hubbard Lake
  • Grapevine Lake
  • Ray Roberts Lake
  • Lake Lewisville

Each reservoir has eight study sites. Samples are collected at a minimum of five equidistant depths in the water column, including top and bottom depths, at each site.

Samples are analyzed for nutrients (nitrogen, phosphorus, and multiple species of each nutrient) and major ions by the USGS National Water Quality Laboratory (NWQL).