Dewatering Solutions using MODFLOW

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Presentation transcript:

Dewatering Solutions using MODFLOW Jeremy Fowler, Braden Error, Hani Abu-Hmeidan Group 1

Location

Problem Description & Desired Product High water table Desired Outcome !!

Potential Solutions French Drains Pumping

MODFLOW Finite Difference numerical model developed by United States Geological Survey. Model both steady state and transient flow in an aquifer. MODFLOW operated by ModelMuse GUI.

Building the Model Inputs Required: * Boundary Conditions Two constant head boundaries * Hydraulic Conductivity Two ranges: 1 X 10^-9 cm/s (Clays) - 1 X 10^-3 cm/s (Sands) High and Low Ranges were Modeled * Specific Yield * Cell Size 2 - 20 % (USGS 1963) 4’ X 4’ Cells

Building the Model

Running The Model Transient (30 days, 60 days, 1 year, 3 years) and Steady State

Results for a Single French Drain System

Results for a Triple French Drain System

Results for Five Drains

Accuracy of the Model? “...all models are wrong, but some are useful...” -George Box Time and money constraints limit the “accuracy” of the model. Model improvements could have been made by: Performing Hydraulic Conductivity Tests / Pump Tests Refining Model with more layers Calibrating Model using observed Heads Converting from Regional Model to Local (Boundary Condition refinement)

Questions?