Source characterization and biogeochemical consequences of wastewater and agricultural C, N, and P inputs to the Sacramento-San Joaquin Delta region

R/SF-84
Start/End: March, 2017 to March, 2019

The Delta receives large inputs of biologically important C, N, P, and S compounds from wastewater disposal and agricultural drain discharge. These inputs can affect water quality, primary productivity, and the function of organisms higher on the food web.

In order to better understand the impacts of the delivery of C, N, P, and S compounds to the Delta environment from wastewater and agricultural drain discharge sources, it is necessary to first characterize these inputs both spatially and temporally in a manner that facilitates tracing them through subsequent biogeochemical processes in the Delta environment.

This project will:

  1. Characterize spatial and temporal variation in C, N, P, and S compound concentrations and stable isotope composition of wastewater and agricultural drain discharge sources to the Delta.
  2. Synthesize collected data with existing hydrologic and water chemistry data to better understand transport, biogeochemical transformation, uptake, and fate of C, N, P, and S compounds in the Delta environment.

This research will be used by the U.S. Geological Survey to supplement an investigation of Delta biogeochemical processes, and by regulators and policymakers looking for guidance and actionable data related to managing wastewater and agricultural drain discharge in the Delta.