Civil, Hydraulic & Environmental Engineering

PWA offers a wide range of civil, hydraulic, and environmental engineering services. Our staff of licensed professionals brings a level of experience required for successful completion of our client’s projects, from planning through implementation and monitoring.

PWA’s expertise and experience includes:

Assessment, design, construction, and monitoring of aquatic habitat restoration and enhancement projects
Fish passage analysis and designs, including culverts, bridges, roughened channels, and stream simulations
Stream, wetland, and riparian restoration, including in-channel and off-channel salmonid habitat improvement projects
Dam removal design and construction management
Hydrology and hydraulic modeling
Engineering soils reports (R1 & R2)
Engineered grading and drainage plans
Domestic & agricultural water storage (ponds, tanks, and reservoirs)
Municipal water supply systems
Wastewater systems planning and engineering
Stormwater management and design
Water quality and water resources management planning
Low Impact Development (LID) solutions for stormwater and wastewater
Percolation testing and leachfield design for septic systems (click for more information...)
Groundwater & soil remediation
Well site development
Water quantity and quality testing
Erosion control planning & stormwater management
Construction site planning and implementation, including technical oversight of BMP installation
Geologic hazard evaluations
Ranch and rural road planning, inventory, and analysis
Road and driveway construction, upgrading and storm-proofing
Topographic surveying, employing both standard ground surveying techniques and drone-based topographic mapping
Hillslope, embankment, and stream channel stability assessments, designs, and repairs, including biotechnical erosion control and stream bank stabilization
Bridge and stream crossing designs for rural roads