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Groundwater Modeling Assignment #2

Groundwater Modeling Assignment #2. Description. Well pumping an unconfined aquifer at 18,000 m 3 /day. Will pumping “ significantly reduce ” the discharge to the wetland at south? Grid = 40 Rows, 18 Columns Grid cells = 250 m x 250 m All cells are 40 m thick. N-S Cross-Section View.

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Groundwater Modeling Assignment #2

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  1. Groundwater Modeling Assignment #2

  2. Description • Well pumping an unconfined aquifer at 18,000 m3/day. • Will pumping “significantly reduce” the discharge to the wetland at south? • Grid = 40 Rows, 18 Columns • Grid cells = 250 m x 250 m • All cells are 40 m thick N-S Cross-Section View Plan View

  3. Create a New Model • Start the GV program • Select File --> New • Enter basic information about the model • # rows = 40 # cols = 18 • Row spacing = 250 m • Column spacing = 250 m • Top of Layer 1 = 1020 m • Bottom of Layer 1 = 980 m

  4. Model Grid 1020 m • Layer 1 • Kh= 50 m/day • Kv= 50 m/day • Pumping • 18,000 m3/day • Recharge • 0.001 m/day 980 m

  5. River Boundary Conditions • Select  Layer 1 • Select BCs  River • Select BCs  Insert  Window • Select  Row 1, Column 1 - 18 River Boundary Cells Note

  6. Add Constant Head Boundary Conditions • Select: BCs  Constant Head Boundary • Select: BCs  Insert  Window • Select: Row 40, Column 1 - 18 • Set value to • Boundary Head = 1000 m Constant Head Boundary Cell

  7. Edit Database – Recharge • Select: Properties  Recharge • Select: Property Values  Database • Set up 1 zone: Recharge = 0.001 m/day • Click OK

  8. Assign Recharge Values to Layers • Select: Props  Recharge • Select: Props  Set Value or Zone  Window • Start in upper right-hand corner and drag to select all cells in grid • Click OK • Select: Zone Number 1 • Click OK

  9. Create MODFLOW Dataset • Select: Model  MODFLOW  Packages • Change: Root File • Select: OK

  10. Create MODFLOW Dataset • Select: Model  MODFLOW  Package Options • Select: Length Units = meters • OK

  11. Create MODFLOW Dataset • Select: Model  MODFLOW  Package Options • Select: Tab  Initial Heads • Enter: 1000 ft • Select: OK

  12. Create MODFLOW Dataset • Select: Model  MODFLOW  Package Options • Select: Tab  BCF-LPF • Select: Layer 1 as “UnConfined” • Select: OK

  13. Create MODFLOW Dataset • Select: Model  MODFLOW  Package Options • Select: Tab  Recharge - ET • Select: Top Layer • Select: OK

  14. Create Working Directory • Select: Model  Paths to Models • Select: C:\your_directory\work

  15. Run Simulation • Select: Calculator button • Would you like to process the results? Select: Yes • Select: Cell-by-cell flows • Select: Contour Water Table in Layer 1

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