The Port of Seattle is soliciting proposals from qualified consulting firms to provide hydraulic and hydrologic support services under an indefinite-delivery, indefinite-quantity contract. The selected consultant will support development and redevelopment projects, primarily at Seattle-Tacoma International Airport, by conducting hydrologic and hydraulic analyses, investigations, and design services. The scope includes modeling water flow systems, evaluating environmental impacts, supporting stormwater and wastewater infrastructure, and ensuring compliance with environmental regulations. Additional services involve design review, facility assessments, cost analysis, and coordination with regulatory agencies. The contract is intended to support capital improvement projects and ongoing operational needs, with work issued on an as-needed basis through service directives. The agreement is expected to span five years with optional extensions and to emphasize technical expertise, environmental compliance, and adaptability across multiple project types.