1 / 11

A Saltwater Upconing Model to Evaluate Wellfield Feasibility

A Saltwater Upconing Model to Evaluate Wellfield Feasibility. Gregory W. Council Christopher J. Richards June 2008 Salt Water Intrusion Meeting (SWIM) Naples, Florida, USA. Location & Purpose. Franklin Co., FL Tate’s Hell Proposed Wellfield Drawdown? Upconing?. Hydro- geology.

dyani
Download Presentation

A Saltwater Upconing Model to Evaluate Wellfield Feasibility

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. A Saltwater Upconing Model to Evaluate Wellfield Feasibility Gregory W. Council Christopher J. Richards June 2008 Salt Water Intrusion Meeting (SWIM) Naples, Florida, USA

  2. Location &Purpose • Franklin Co., FL • Tate’s Hell • Proposed Wellfield • Drawdown? • Upconing?

  3. Hydro-geology

  4. Field Data • Slug Tests • Surficial Aquifer • Aquifer Performance Tests • Floridan Aquifer • Intermediate Confining Unit • Borehole Geophysical Logs

  5. APT Calibration

  6. Lateral Boundary Conditions Fresh: c = 0 Saline: c = 35 g/L

  7. Simulation Method • Top Boundary • Recharge: 500 mm/yr (20 in/yr) • ET: 330 mm/yr (13 in/yr) max • Pre-pumping equilibrium • Reasonable initial head, concentration • 1000 yr simulation (10 d – 10 yr step) • Solute mass stable; head & conc. stable • Simulate Pumping • 7,600 m3/d (2 mgd)

  8. Drawdown • Floridan Aquifer

  9. Upconing • Surficial Aquifer

  10. Model Sensitivity: Upconing • Initial Depth of the Brackish Zone • Lateral Boundary Conditions • Dispersivity • Vertical Hydraulic Conductivity • Effective Porosity • Well Location

  11. Conclusions • Upconing of 250 mg/L chloride: ~35 m in 50 yr ~85 m equilibrium • Need to identify current position of brackish zone • Top boundary important for Surficial Aquifer drawdown • Well placement • Simple, general method for impact assessment

More Related