Representative Projects
Hydrologic Studies ~ Water Rights Engineering ~ Water Supply Planning ~ Design, Ops & Maintenance
Water Supply Planning
Client: City of Lafayette, Colorado
TZA developed a raw water supply operational model to assist the City in planning for its acquisition of water rights and storage facilities. The model can simulate the operations of various direct flow and storage rights which divert from South Boulder and Boulder Creeks, as well as alternative operating scenarios for raw water storage facilities. The raw water supply model has been used to determine the firm (dry year) yield which can be derived from the City's existing water rights portfolio, to evaluate the increased yield which may be obtained from purchase of various additional water rights, to evaluate the benefits of alternative modes of reservoir operation, and to quantify the amount of raw water storage needed to optimize the firm yield of various water right portfolios.
Client: Eastman Kodak Company, Windsor, Colorado
Eastman Kodak Company operates a plant located near Windsor, Colorado. The Kodak plant obtains its treated water supply from the City of Greeley pursuant to the terms of a water supply contract. The contract requires that Kodak provide Greeley with raw water in amounts equal to the quantity of treated water supplied to Kodak. TZA was retained by Kodak to evaluate the firm yield of its sources of industrial raw water supplies under various drought conditions.
The water attributable to Kodak's ownership of Colorado‑Big Thompson (C‑BT) Project units is its primary source of raw water supply. The firm yield of Kodak's C‑BT units was determined for hydrologic conditions corresponding to droughts that can be expected to occur once in twenty years and once in fifty years, as well as for the historic drought that occurred during the 1950s. The raw water yielded by Kodak's source of supply in each of these drought conditions was contrasted to the projected water supply requirements at the plant. The results of the study were presented in a report for use by Kodak's management in making water supply planning decisions.
Client: Summit County, Colorado
Summit County retained TZA to perform a reconnaissance level study to investigate the feasibility of enlarging Old Dillon Reservoir, a small storage facility located about two miles southwest of the Town of Dillon. Hydrologic analyses were performed to estimate the volume of water that would be available from an ungauged watershed for storage in the reservoir in wet, average, and dry conditions. Alternative conceptual designs to enlarge the reservoir by 40 acre-feet and by 190 acre-feet were prepared. Cost estimates for both alternatives were also developed, and the study results compiled in a report that was submitted to the county.
TZA has also analyzed the water resources issues associated with the proposed enlargement of Old Dillon Reservoir as part of a preliminary National Environmental Policy Act (NEPA) and U.S. Forest Service Special-Use Permit scoping effort. Potential issues examined included operational impacts of use of Old Dillon Reservoir as a water supply facility, impacts to instream flows as a result of increased diversions to storage, and impacts to instream flows as a result of exchange operations.
