Introduction
Study area
Data sources and methods of analysis
Data sources
Methods of analysis
Evaluating geographic information
Comparing regional and well-specific fluxes
Parameter category | Parameter | Value |
---|---|---|
Half-space domain dimensions | Width | 628 m |
Length | 1,638 m | |
Depth | 75 m | |
Upper and lower aquifer parameters | Thickness | 30 m |
Horizontal hydraulic conductivity | 10−2 cm/s | |
Vertical hydraulic conductivity | 10−3 cm/s | |
Storage coefficient | 10−4 | |
Porosity | 0.3 | |
Recharge (upper) | 9 × 10−4 m/d | |
Initial concentration (upper) | 100 mg/l | |
Initial concentration (lower) | 10 mg/l | |
Aquitard parameters | Thickness | 15 m |
Horizontal hydraulic conductivity | 10−5 cm/s | |
Vertical hydraulic conductivity | 10−6 cm/s | |
Storage coefficient | 10−4 | |
Porosity | 0.3 | |
Initial concentration | 100 mg/l | |
Idle well parameters | Gravel pack hydraulic conductivity | 1 cm/s |
Casing hydraulic conductivity | 100 cm/s | |
Hydraulic gradients | Horizontal in aquifers | 0.001 |
Vertical across aquitard | −0.15 |
Limitations
Results and discussion
Conditions creating potential for conduit migration
Areas of concern
Constituent | Total | Agricultural | Industrial | Municipal | Domestic |
---|---|---|---|---|---|
Nitrate | 875 | 711 | 9 | 10 | 145 |
TDS | 1,505 | 1,280 | 27 | 17 | 181 |
Both | 418 | 353 | 7 | 6 | 52 |
Location | Water (m3/180 d) | NO3-N (kg/180 d) | TDS (kg/180 d) | |||
---|---|---|---|---|---|---|
Low | High | Low | High | Low | High | |
Study area | 5.6 × 107 | 2.8 × 108 | 4.2 × 105 | 2.1 × 106 | 5.1 × 107 | 2.5 × 108 |
Min section | 5.0 × 100 | 2.5 × 101 | 2.3 × 10−2 | 1.2 × 10−1 | 9.2 × 10−1 | 4.6 × 100 |
0% | 0% | 0% | 0% | 0% | 0% | |
Max section | 9.7 × 105 | 4.8 × 106 | 6.1 × 103 | 3.0 × 104 | 1.4 × 106 | 6.7 × 106 |
1.7% | 1.7% | 1.5% | 1.5% | 2.6% | 2.6% |