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Title:	Water quality analysis of Alamo Lake : feasibility of in-lake management for water quality enhancement
Authors:	Ashby, Steven L. Myers, John L. Stuart, Robert J.
Keywords:	Alamo Lake (Ariz.) Reservoirs Water quality Thermal stability Oxygen depletion Anoxia Aeration Hydrogen sulfide
Publisher:	Environmental Laboratory (U.S.)
Series/Report no.:	Miscellaneous Paper;EL-96-7
Abstract:	Abstract: Excessive concentrations of hydrogen sulfide in the discharge from Alamo Lake have resulted in corrosion of electrical connections and degradation of concrete in the outlet works of the dam and periodic obnoxious odors in the general area of the release. Damage to the outlet works has increased maintenance costs, and the presence of odors is undesirable. Routine water quality sampling procedures and data were evaluated, and supplemental data collection and analyses were conducted to describe water quality processes associated with hydrogen sulfide generation. Intense thermal stratification results in the isolation of hypolimnetic water and subsequent oxygen depletion and associated material cycling. Thermal stability was relatively high for the summer season due to surface warming and limited discharge. Oxygen depletion rates of 0.03-0.07 mg L⁻¹ day⁻¹ and 0.1-0.5 mg L⁻¹ day⁻¹ were calculated using PROFILE and estimated from measurements of oxygen depletion in discrete samples, respectively. Chemical gradients of selected variables were minimal, and production of hydrogen sulfide coincided with low concentrations of iron, manganese, and other redox reactive elements. Sulfate concentrations were greater than 50 mg L⁻¹, and measurable concentrations of sulfide were more common during the latter period of stratification. Recommendations for water quality enhancement included hypolimnetic aeration and change in withdrawal.
URI:	http://hdl.handle.net/11681/20646
Appears in Collections:	Miscellaneous Paper