OEI is committed to finding practical, scientifically rigorous, and innovative solutions to help address a wide variety of water and natual resource management issues facing our clients and our communities
Hydrology - Geomorphology - Engineering Geology 
Hydrology & Hydraulics
Watershed Modeling & Planning
Stream Restoration
Fish Passage Improvement
Flood Hazard Mitigation
Groundwater Availability
State Water Rights
Engineering Support Services
CEQA Analysis and Permitting
Expert Witness Services