Hydrology / HEC-HMS / HEC-RAS SME for Utility Scale Solar Plant

Description: We are looking for an experienced hydrology and hydraulics engineer to support model development, review, and validation for an approximately 400 MW utility-scale solar plant. This is a technical consulting and model review role. We need someone who can work with our internal engineering team, advise on appropriate modeling methodology, review assumptions, validate HEC-HMS / HEC-RAS setup, and help confirm that the resulting outputs are suitable for owner, AHJ, and engineering review. Scope may include: Advise on HEC-HMS and HEC-RAS model setup for large solar/energy sites. Review hydrology inputs, watershed assumptions, flow paths, rainfall/storm events, runoff methodology, boundary conditions, and model outputs. Review hydraulic design assumptions for culverts, channels, drainage crossings, low-water crossings, and site drainage interfaces. Support culvert and low-water-crossing sizing/validation. Advise what modeling outputs, reports, exhibits, and documentation are typically expected by owners, AHJs, or engineering reviewers. Review existing reports/outputs where available and advise what needs to be recreated, updated, or reused. Consider available geotechnical and soil information where relevant to runoff assumptions, infiltration, erosion, scour, and hydraulic design constraints. Join working sessions with our internal engineer to walk through model setup, assumptions, execution, and results. Ideal background: Strong HEC-HMS and HEC-RAS experience. Hydrology/hydraulics experience on solar, BESS, substations, roads, industrial sites, or similar large civil infrastructure. Experience with drainage crossings, culverts, low-water crossings, flood modeling, stormwater design, and watershed analysis. PE preferred; Arizona and/or Texas experience is a plus. Comfortable reviewing another engineer’s model setup and explaining recommended changes. Able to provide clear written comments, model review notes, and practical engineering guidance. Initial engagement: Hourly consulting, likely starting around 20 hours, with potential for follow-on modeling/review work.