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SBA-certified EDWOSB · GSA MAS 47QRAA22D009K · Mon–Fri 9am–6pm ET

Solutions  /  H&H Modeling

Hydrologic & Hydraulic Modeling Services

Surface water, groundwater, and water quality modeling for engineering firms and public agencies, from full watershed studies to the modeling piece of your project.

What we model

For each part of the water cycle.

100-yr floodWater tableSurficial aquiferConfining unitFloridan aquiferSaltwaterStorm pipeSupply wellPond123456
  1. 1

    Watershed hydrology

    Rainfall-runoff, design storms, peak flows. HEC-HMS, HSPF

  2. 2

    Riverine & floodplain hydraulics

    1D/2D flow, floodplains, bridges and culverts. HEC-RAS, RiverFlow2D, MIKE 11

  3. 3

    Stormwater & urban drainage

    Inlets, pipes, ponds, level of service. ICPR, EPA SWMM

  4. 4

    Integrated surface water & groundwater

    Wetlands and high water tables, modeled together. MIKE SHE, MODHMS

  5. 5

    Groundwater flow

    Aquifers, wellfields, dewatering, saltwater intrusion. MODFLOW, GW Vistas

  6. 6

    Water quality & transport

    Nutrients, sediment, and contaminants downstream. WASP, MIKE ECO Lab

Two ways to work with us

Hand us the whole study, or just the modeling.

For agencies & project owners

Full modeling studies

We take the study from data collection to final report: building the model, calibrating it, running scenarios, and presenting the results to your board or staff.

  • Watershed & floodplain studies
  • Stormwater master plans & level-of-service analysis
  • Integrated surface water & groundwater studies
  • Water quality & nutrient transport assessments

Best for: counties, water management districts, municipalities, and landowners who need the full study, start to finish.

Discuss a study →

For engineering firms

Modeling support for your project

You stay the prime. We handle the time-consuming modeling tasks to your standards and schedule.

  • Model setup, calibration & production runs
  • Design storm & scenario simulations
  • Delivered in your formats and report templates
  • Overflow capacity when deadlines stack up

Best for: civil and environmental firms without in-house modelers, or with more modeling than their team can take on.

Add modeling capacity →

Modeling tasks we take on

We take on any step on its own, or the whole workflow.

Get help with one task →
  1. STEP 01

    Data & model setup

    • Data mining & pre-processing
    • Model conceptualization & setup
    • GIS data management & tools
    • Telescoping from regional models
  2. STEP 02

    Calibration & testing

    • Model calibration & validation
    • Sensitivity analysis
    • Mass balance checks
    • Model QA/QC
  3. STEP 03

    Simulation & analysis

    • Design storm simulations
    • Scenario & alternatives analysis
    • Reservoir & storage modeling
    • Post-processing & mapping
  4. STEP 04

    Review & custom tools

    • Independent model peer review
    • Fixing numerical instabilities
    • Custom models & calculators
    • Automation scripts (Python, C#)
MODEL REVIEW & QA/QC

Model unstable, uncalibrated, or stuck in review?

We review and repair models built by others: independent peer review, stability fixes, recalibration, and responses to agency comments.

Send us your model →

Tell us the software, the project, and what's going wrong.

IF YOUR MODEL…
WE…
Crashes or won't converge
Trace the numerical instability (time step, cross-section spacing, boundary conditions) and fix it.
Doesn't match observed data
Recalibrate against gauges and high-water marks, and document every parameter change.
Gains or loses water it shouldn't
Run mass balance checks by component to find where volume is leaking.
Is stuck in agency review
Work through reviewer comments, revise the model, and draft the responses.
Was built by someone else
Deliver an independent peer review memo before you rely on the results.