Hydrology

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.

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.