Hydrology & Hydraulics – Modeling & Analysis

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BEI performs comprehensive hydrologic and hydraulic (H&H) analyses for drainage studies, floodplain determinations, stormwater management, and infrastructure design. As a Certified Floodplain Manager (CFM), BEI’s principal brings regulatory fluency and technical rigor across all modeling platforms and study scales.

Scope of Services

Hydrologic Analysis

Watershed delineation and land use/cover analysis
Rainfall-runoff modeling: NRCS CN method, Green-Ampt infiltration, unit hydrograph methods
Design storm development: NOAA Atlas 14 rainfall depths, frequency analysis
HEC-HMS rainfall-runoff and routing simulations
Regional regression equations (USGS StreamStats) for ungauged watersheds

Hydraulic Modeling

1D steady and unsteady flow modeling – HEC-RAS open channel and pipe network
1D/2D coupled modeling – HEC-RAS 2D mesh integration with channel cross-sections
2D floodplain modeling – full two-dimensional inundation mapping and velocity analysis
SWMM (EPA Stormwater Management Model) – urban drainage networks, detention routing, water quality
Detention and retention pond sizing: Modified Puls routing, stage-storage-discharge curves
Inlet hydraulics design per HEC-22 criteria
Manning’s equation and normal depth computations for open channels and culverts
FEMA LOMA/LOMR support and effective floodplain model revisions

Typical Projects

Study Types

Drainage Studies	Watershed-scale H&H analysis for private development and public infrastructure
Floodplain Analysis	Effective model updates, conditional LOMRs, and no-rise certifications
Detention Sizing	Detention basin design with routing and regulatory volume compliance
Stormwater Management	Low-impact development, green infrastructure, and water quality analysis
On-Call H&H Support	Municipal retainer services for drainage project review and permitting support