Water Resources Projects

Construction Management

Reservoir Outlet Rehabilitation Oversight

Left Hand Ditch Company, Boulder County, Colorado

Reservoir Outlet Rehabilitation OversightEngineering Analytics provided the outlet works rehabilitation design and construction oversight for Lake Isabelle. Access to the control valve was unsafe and required climbing down a poorly ventilated 50 foot deep shaft at a remote mountain site.

The new design involved closing/remediating the access shaft and adding new pressure piping with a control gate that can be easily accessed. EA oversaw the entire construction process ensuring that an engineer was always present to make and approve any necessary design changes.

Irrigation System Rehabilitation

Larimer & Weld County Irrigation Company, Weld County, Colorado

Irrigation System RehabilitationEngineering Analytics was retained to provide all services required to rehabilitate thirteen major conveyance and check/drop structures along 26 miles of a main supply canal. The irrigation system was constructed in the late 1800s and early 1900s and many of the structures can no longer effectively convey and check the ditch. The canal has a capacity of approximately 1,000 cfs in the upper reaches and carries approximately 275 cfs at its termination. EA provided all geotechnical services, the design of the rehabilitation of the ditch and structures, specifications, contract documents, and all construction services including contract administration, inspection, and quality control testing. EA also prepared a feasibility study and assisted with obtaining funding for the project through the Colorado Water Conservation Board.

Canal Repair and Slope Stabilization

Windsor Reservoir & Canal Company, Weld County, Colorado

Canal Repair and Slope StabilizationA 2,000 foot mountainside section of the Poudre Valley Canal, with a peak capacity of 400 cfs, was failing and sliding downhill endangering the adjacent highway. Engineering Analytics staff conducted a feasibility study to obtain funding through the Colorado Water Conservation Board to repair the canal. The existing canal section was removed and replaced with a reinforced concrete section. Seepage from the existing section was one of the major components creating the stability problems. The slope from the canal to the highway was also flattened and portions recompacted to increase the stability of the slope. Also, a drain was installed on the downhill side of the canal to intercept seepage and the canal section was reduced in width to allow moving the canal from the rock cliff to reduce rock fall problems. The cliff was scaled and portions blasted prior to construction to reduce the hazard potential during construction. In addition to the project design, drawings, specification, and contract documents, EA provided construction services including contract administration, inspection, and testing for the project.

Inlet Structure Design

Larimer & Weld Irrigation Company, Weld County Colorado

Inlet Structure DesignEngineering Analytics designed a new inlet/drop structure for Windsor Reservoir. The original structure was over 100 years old and in complete disrepair. The new structure can safely handle a maximum flow rate of 800 cfs and drops 34 feet from the Eaton Ditch to the reservoir. The structure includes a diversion structure in the canal with a 25 foot wide Obermeyer gate to check the Eaton ditch, a 25 foot wide Obermeyer gate to control the discharge into the reservoir, and a cast-in-place 15 foot Parshall flume to measure flows into the reservoir.

EA provided the geotechnical investigations, hydraulic, structural, and geotechnical design, materials testing, and a feasibility study with funding through the Colorado Water Conservation Board. EA also provided construction QC services and resident inspection during construction.

Dam and Check Structure Design

Larimer & Weld Irrigation Company, Weld County Colorado

Dam and Check Structure DesignLake Lee Dam is a dam and check structure on the Eaton Ditch that controls the ditch and creates an equalizer reservoir. Engineering Analytics designed a replacement structure that can discharge 1,000 cfs and bypass flood flows. This was accomplished using three 10 foot Rubicon overshot gates with automatic water level and discharge control.

EA provided all geotechnical investigations, all hydraulic, structural and geotechnical design, materials testing, a feasibility study with funding through the Colorado Water Conservation Board. EA also provided construction QC services and resident inspection during construction.