1. ALTERNATIVE APPROACHES FOR WATER EXTRACTION IN AREAS SUBJECT TO SALTWATER UPCONING
David L. Tarbox, P.G., P.H.G. William C. Hutchings, P.G. HSA Engineers & Scientists, Tampa, FL

2. Simulate LATERAL INTRUSION by reducing the quantity of recharge
Withdrawal (Q)
Simulate LATERAL INTRUSION by reducing the quantity of recharge
by the same volume being withdrawn
Recharge
T-3
T-2
T-1

3. Horizontal and vertical hydraulic conductivities,
Withdrawal (Q)
T-3
T-2
T-1
UPCONING
is influenced by:
Horizontal and vertical hydraulic conductivities,
Rate and method of groundwater extraction,
Proximity of the intake to the interface

4. STRATIGRAPHY Kh=100 m/d Kv=1.0 m/d Kh=0.10 m/d Kv=0.1 m/d
Fully Penetrating
Shallow
3.5 meters
Kh=25 m/d Kv=2.5 m/d
-15 meters
Kh=100 m/d Kv=1.0 m/d
-27.5 meters
Kh=0.10 m/d Kv=0.1 m/d
- 40 meters
Kh=100,000 m/d Kv=10 m/d
-55 meters
Trench
ELEVATION
-0.5 m
-5.0 m
STRATIGRAPHY

5. STEADY STATE CONDITIONS
Salinity
250 MG/L
500 MG/L
1,000 MG/L
5,000 MG/L
10,000 MG/L
20,000 MG/L
STEADY STATE CONDITIONS
Uniform Recharge: meter/day

6. FULLY PENETRATING WELL
Salinity
250 MG/L
500 MG/L
1,000 MG/L
5,000 MG/L
10,000 MG/L
20,000 MG/L
FULLY PENETRATING WELL
Discharge Rate: 384 m3/day

7. SHALLOW WELL Salinity Discharge Rate: 384 m3/day 250 MG/L 500 MG/L

8. HORIZONTAL TRENCH Salinity Discharge Rate: 384 m3/day 250 MG/L

9. APPLICATION

10. CONCLUSIONS With Suitable Conditions
Encourage similar approaches by large users of irrigation water
Golf Courses, Nurseries, & Subdivisions
Protect groundwater from saltwater intrusion