Water Supply Evaluations


Cherry Creek Alluvial Modeling Project:

There are a number of water supply entities in the Upper Cherry Creek Basin in the Denver metropolitan area (upstream of Cherry Creek Reservoir) that compete for relatively small renewable water supplies on Cherry Creek. These entities decided to evaluate regional cooperation possibilities through the use of a numerical surface water/ground water hydraulic interaction flow model, as well as a water rights assessment tool. LWS developed the numerical surface water/ground water model using MODFLOW. The model simulates the alluvial pumping points for each water supply entity, as well as the surface diversion for Rueter-Hess Reservoir, and discharge points associated with water reclamation facilities. The model has been used to evaluate multiple water use, and water sharing, scenarios to evaluate optimizing the beneficial use of limited Cherry Creek water supplies.

Timnath Landing Dewatering:

LWS developed a numerical ground water flow model using MODFLOW to evaluate the most efficient means to dewater the alluvial aquifer underlying the proposed residential and commercial development. The proposed dewatering methodology was the construction of three ponds that would drain adjacent alluvial aquifer water by gravity, with the ponds being maintained at constant elevations that would facilitate permanent dewatering. The results of the LWS MODFLOW model have been used by the civil engineering firm that is preparing the development plan, as it demonstrates the means to dewater the site to allow foundation and basement construction.

Sustainable Water Resources Water Supply Development Project:  

LWS has use the existing Rio Grande Decision Support Systems (RGDSS) numerical ground water flow model, developed in MODFLOW, to evaluate both the ability to develop a 35,000 ac-ft/yr water supply project as well as assess potential injury to other water rights within the basin. Given the need for an augmentation plan to offset depletions associated with the proposed water supply project, multiple analyses were completed to assess the most efficient means to develop an augmentation water supply.

Spear T Ranch:

The Ranch is located in Morrill County, Nebraska and it has two surface water permits for diversions from Pumpkin Creek. However, over the years ground water use has increased upgradient from the Ranch such that surface flows have continued to diminish due to the hydraulic interaction between the local ground water table and the surface flows and Pumpkin Creek. LWS was requested to develop a numerical surface water/ground water model of Pumpkin Creek and the associated alluvial ground water system, using MODFLOW, to assess the magnitude of injury to the Spear T Ranch water rights. This case was pursued in Nebraska District Court (CI03-16).

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