Hydrology and Hydraulic Engineering
Mr. Devin has performed numerous hydrologic and hydraulic studies in Plumas County since 1999. He has extensive local knowledge of the Middle Fork of the Feather River and Spanish Creek / East Branch of the North Fork Feather River hydrologic units as well as others. He has also performed such studies in southern California as a component of stream simulation (i.e. restoration) / Aquatic Organism Passage (AOP) projects.
He has performed numerous flood-frequency analyses and a two station comparison on Indian Creek. He has also developed numerous rainfall-runoff models for small watersheds and performed pond routing using PondPack and HEC-HMS. Mr. Devin has also developed local streamflow regression equations for portions of the Upper Feather River Watershed.
He often performs water surface profile analyses using HEC-RAS including both steady and unsteady flow analyses. These studies have included both 1D and 2D models which frequently include bridge and culvert hydraulics and their corresponding backwater effects. Mr. Devin has also performed scour analyses at the location of proposed bridge structures. HEC-RAS analyses have also been performed as part of stream or meadow restoration projects locally and in the Cleveland National Forest in Orange County, California.
The end product of these studies is often Base Flood Elevations (BFE) and Special Flood Hazard Area (SFHA) delineation which are submitted to FEMA in support of a Letter of Map Amendment (LOMA) or Letter of Map Revision (LOMR) of the NFIP. Mr. Devin has also performed Bridge Hydraulic Design Studies and Location Hydraulic Studies (LHS) for bridge and highway improvement projects.
Flooding at the confluence of Spanish and Greenhorn Creeks, Quincy, California (January 08, 2017)