Sedimentation is progressively reducing the storage capacity of Cheney Reservoir. TP annual mean concentrations during runoff conditions only exceeded the CRTF runoff goal during 2002. TSS and nitrate plus nitrite annual mean concentrations during runoff conditions never exceeded the CRTF runoff goal. Nitrate plus nitrite and TP annual mean concentrations exceeded the base-flow goals every year.

Except for 2012, annual mean TSS concentrations exceeded the base-flow goal every year. CRTF goals for base-flow concentrations were exceeded more frequently (70 to 99.9 percent of the time) than runoff goals (0 to 11 percent of the time). The models updated in this report include total suspended solids (TSS), suspended-sediment concentration (SSC), nitrate plus nitrite, nitrate, orthophosphate (OP), total phosphorus (TP), and total organic carbon (TOC).ĭaily computed concentrations for TSS, TP, and nitrate plus nitrite during 1999–2019 were compared with Cheney Reservoir Task Force (CRTF) goals for base-flow and runoff conditions. Regression models were developed to describe relations between discretely measured constituent concentrations and continuously measured physical properties. Continued data collection would be beneficial to update and describe changing water-quality conditions in the drainage basin and in the reservoir over time. Geological Survey site 07144780) since November 1998. Geological Survey, in cooperation with the City of Wichita, has been continuously monitoring water quality (including water temperature, specific conductance, pH, dissolved oxygen, and turbidity) on the North Fork Ninnescah River upstream from Cheney Reservoir (U.S. The North Fork Ninnescah River is the largest tributary to Cheney Reservoir and contributes about 70 percent of the inflow.

Cheney Reservoir, in south-central Kansas, is the primary water supply for the city of Wichita, Kansas.

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