Groundwater Modeling

Groundwater Modeling System

Griffin utilizes a GMS (Groundwater Modeling System) to analyze the project and design the groundwater control system. This is especially true in cases where the analytical method applications are limited due to different reason such as underground condition and site topography.

Examples of Numerical Analysis using GMS:

Total head contour for a dam structure with relief well

Total head contour from SEEP2D for a dam structure with relief well. Case study in Fort Worth, TX.

3D view of dam structure using GMS

Case study in Fort Worth, TX: 3D view of a Dam structure and downstream terrain, using GMS.

SEEP 2D

Griffin uses two dimensional seepage analysis in order to calculate the flow lines, constant head lines and water table for specific projects like dam seepage and cutoff wall dewatering.

 

Cross section of dewatering system inside shoring walls

Cross section of Dewatering system design inside shoring walls, using SEEP2D. Case study in Palm Desert, CA.

MODFLOW

Using MODFLOW helps analyze the 3D models for the dewatering system. The cone of depression resulting from dewatering can be simulated and shown in 3D view. The flowrate required for drawdown at each jobsite can be estimated for each well location.

Equipotential lines illustration for a dewatering system inside shoring walls

Equipotential lines illustration for a Dewatering system inside shoring walls, using MODFLOW.

Dewatering depression cone (3D view) and radius of influence around the jobsite from MODFLOW.

3D depression cone
Radius of influence diagram
Deep well system design with cutoff walls

Deep well system design in combination with Cutoff walls to control the groundwater . Case study: Polk county, Iowa.

MODFLOW Transient Model

The drawdown at any time of dewatering can be estimated using MODFLOW transient model. This also provides the initial to steady state flow rate of dewatering which is helpful to predict the Pump’s horse power, discharge pipe size and treatment system capacity requirement at the discharge point.

Water table contour on day 7 of dewatering

Water table contour on Day 7th of dewatering, using a MODFLOW transient model. Case study in Independence, MO.

Dewatering system radius of influence

Radius of influence from a dewatering system, using MODFLOW Steady state. Case study in NY.

Site Investigation

Site Investigation for Construction Below the Water Table is important in dewatering design. Griffin engineers review the geotechnical reports and available boreholes in order to find out more about the site aquifer and soil stratigraphy. This helps us gain a better understanding of the soil profile at the jobsite. Then, using that information in the model analysis, we use soil and borehole modules from GMS.

Soil stratigraphy using borehole module
GMS borehole map

Soil stratigraphy, using GMS Borehole Module, based on the available borehole data. Case study: Ammonia Plant in Louisiana.

Soil stratigraphy using GMS borehole module

Soil stratigraphy, using GMS Borehole Module, based on the available borehole data. Case study: Treatment Facility in Norfolk, VA.

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