Stormwater and Floodwater

Columbia River Winter Operations Study

Columbia River Winter Operations Study

The Columbia River system, lifeblood of the Pacific Northwest, contains over 60 dams. HAL assisted the U.S. Army Corps of Engineers with a winter operations study using HEC-ResSim and custom scripts.

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Humboldt River Floodplain Analysis

Humboldt River Floodplain Analysis

HAL assisted Elko City, Nevada, with flood delineation and flood mitigation projects. The effort included detailed hydraulic analysis of a reach of the Humboldt River, plus analysis and design of flood mitigation measures on Metzler Wash, Culleys Gully, and Eight Mile Creek. HEC-RAS water surface profiles were used to analyze existing flooding potential and evaluate alternative mitigation measures. Letters of Map Revision (LOMRs) were successfully submitted to FEMA for the projects resulting in improved floodplain conditions.

Litigation Support

Litigation Support

HAL provides engineering litigation support to many local and regional attorneys and legal firms. Services include historic or projected flood conditions, flood damage investigation, post-fire runoff evaluation, flood debris retention, mine tunnel flows, canal use rights, irrigation demand, well failures, surface and groundwater interference, wetland creation, nuisance water, engineer’s duty and professional conduct, property boundary disputes, and development potential and land condemnation.

Jordan River Diversion Structure

Jordan River Diversion Structure

HAL prepared designs and specifications for the Jordan River Diversion Structure Replacement. The structure, located on Utah’s Jordan River just north of 2100 South in Salt Lake City, diverts a portion of the Surplus Canal flow into the Jordan River to meet downstream irrigation requirements and control flood flows. The project features two motor-driven 10′ × 14′ radial gates, energy dissipation blocks within the gate, precast 10′ × 5′ box culverts, and downstream erosion protection.

Barton Creek Flood Control Project

Barton Creek Flood Control Project

Davis County, Utah, selected HAL to design and assist during the construction of improvements to the Barton Creek flood conveyance system. The project included the design and construction of 3,200 feet of 9′ × 4′ box culvert placed in interstate highway and commuter rail rights-of-way. The project utilized open cutting in the 500 West underpass crossing of I-15 northbound lanes, open-cut crossing of I-15 southbound lanes, and open-cut crossing of Pages Lane.