1. | A, Schematic diagram of a pumping well and observation piezometer in an idealized, anisotropic uncon.ned aquifer with a hypothetical moisture distribution indicated for the unsaturated zone. B, A typical double-logarithmic plot of drawdown in an observation piezometer versus time that de.nes the approximate ranges of early-, intermediate-, and late-time. | |
2. | Schematic diagram of a .nite-diameter pumped well, observation well, and observation piezometer in a homogeneous, anisotropic water-table aquifer of in.nite lateral extent. | |
3. | Regional location and local plan view showing the positions of the pumped well (F507-080) and observation wells and piezometers in the study area. The reference piezometer (F343-036) is not used to measure drawdown. | |
4. | Vertical cross section of the aquifer at the study site showing the lengths and positions of the piezometers and observation wells. | |
5. | Measured and simulated drawdowns for the pumped well (F507-080), for the model parameters shown in table 5. | |
6. | Measured drawdowns compared with drawdowns simulated under the assumption of instantaneous release of water from the unsaturated zone, piezometers F505-080 and F504-080. | |
7. | Measured drawdowns compared with drawdowns simulated under the assumption of instantaneous release of water from the unsaturated zone, wells F505-059 and F504-060. | |
8. | Measured drawdowns compared with drawdowns simulated under the assumption of instantaneous release of water from the unsaturated zone, piezometers F505-032 and F504-032. | |
9. | Measured drawdowns compared with drawdowns simulated under the assumption of instantaneous release of water from the unsaturated zone, piezometers F377-037 and F347-031. | |
10. | Measured drawdowns compared with drawdowns simulated under the assumption of instantaneous release of water from the unsaturated zone, (A) piezometers F383-061 and F383-032, and (B) piezometers F383-082 and F383-129. | |
11. | Measured drawdowns compared with drawdowns simulated under the assumption of instantaneous release of water from the unsaturated zone, (A) piezometers F384-033 and F385-032, and (B) piezometers F381-056 and F376-037. | |
12. | Measured drawdowns compared with drawdowns simulated under the assumption of instantaneous release of water from the unsaturated zone, (A) wells F434-060 and F450-061, and (B) wells F476-061 and F478-061. | |
13. | Measured drawdowns and drawdowns simulated for piezometer F377-037 using (A) the assumption of instantaneous drainage, (B) gradual drainage using a single empirical parameter, (C) gradual drainage using two empirical parameters, and (D) gradual drainage using three empirical parameters. | |
14. | Measured drawdowns compared with drawdowns simulated under the assumption of gradual release of water from the unsaturated zone, piezometers F505-080 and F504-080. | |
15. | Measured drawdowns compared with drawdowns simulated under the assumption of gradual release of water from the unsaturated zone, wells F505-059 and F504-060. | |
16. | Measured drawdowns compared with drawdowns simulated under the assumption of gradual release of water from the unsaturated zone, piezometers F505-032 and F504-032. | |
17. | Measured drawdowns compared with drawdowns simulated under the assumption of gradual release of water from the unsaturated zone, piezometers F377-037 and F347-031. | |
18. | Measured drawdowns compared with drawdowns simulated under the assumption of gradual release of water from the unsaturated zone, (A) piezometers F383-061 and F383-032, and (B) piezometers F383-082 and F383-129. | |
19. | Measured drawdowns compared with drawdowns simulated under the assumption of gradual release of water from the unsaturated zone, (A) piezometers F384-033 and F385-032, and (B) piezometers F381-056 and F376-037. | |
20. | Measured drawdowns compared with drawdowns simulated under the assumption of gradual release of water from the unsaturated zone, (A) wells F434-060 and F450-061, and (B) wells F476-061 and F478-061. | |
21. | Measured and simulated drawdowns for the pumped well (F507-080) for the model parameters shown in table 6. | |
22. | Measured drawdowns compared with drawdowns simulated under the assumption of instantaneous release of water from the unsaturated zone for selected deep-seated piezometers. | |
23. | Measured drawdowns compared with drawdowns simulated under the assumption of gradual drainage of water from the unsaturated zone for selected deep-seated piezometers. |
1. | Dimensionless expressions. | |
2. | Locations of observation piezometers, number of PEST values and measurement numbers. | |
3. | Parameters obtained from preliminary analysis of hand-measured drawdown data, where S_{y} equals specific yield, b equals saturated thickness, K_{r} equals hydraulic conductivity in the horizontal direction, and K_{z} equals hydraulic conductivity in the vertical direction. | |
4. | Parameters obtained from late-time data exclusively using PEST with b equals 160 feet, where S_{y} equals specific yield, K_{r} equals hydraulic conductivity in the horizontal direction, and K_{z} equals hydraulic conductivity in the vertical direction. | |
5. | Parameters obtained from late-time data exclusively using PEST with b as an estimated parameter, where S_{y} equals specific yield, b equals saturated thickness, K_{r} equals hydraulic conductivity in the horizontal direction, and K_{z} equals hydraulic conductivity in the vertical direction. | |
6. | Parameters estimated from early and late-time data exclusively, using PEST, where S_{s} equals specific storage, S_{y} equals specific yield, b equals saturated thickness, K_{r} equals hydraulic conductivity in the horizontal direction, and K_{z} equals hydraulic conductivity in the vertical direction. | |
7. | Parameters estimated from the complete data set using PEST, where S_{s} equals specific storage, S_{y} equals specific yield, b equals saturated thickness, K_{r} equals hydraulic conductivity in the horizontal direction, K_{z} equals hydraulic conductivity in the vertical direction, and a_{1}, a_{2}, and a_{3} are empirical constants for gradual drainage from the unsaturated zone. | |
8. | Correlation coeficient matrix for table 7, where S_{s} equals specific storage, S_{y} equals specific yield, b equals saturated thickness, K_{r} equals hydraulic conductivity in the horizontal direction, K_{z} equals hydraulic conductivity in the vertical direction, and a_{1}, a_{2}, and a_{3} are empirical constants for gradual drainage from the unsaturated zone. | |
9. | Parameters estimated from the complete data set using PEST with alternative initial values, where S_{s} equals specific storage, S_{y} equals specific yield, b equals saturated thickness, K_{r} equals hydraulic conductivity in the horizontal direction, K_{z} equals hydraulic conductivity in the vertical direction, and a_{1}, a_{2}, and a_{3} are empirical constants for gradual drainage from the unsaturated zone. | |
10A. | Estimates of the variance and standard deviation of head in the aquifer for three-dimensional and one-dimensional flow using equations 27 and 28, where a_{f} ^{2} equals variance of ln K_{r}, J equals horizontal hydraulic gradient, .1 equals horizontal log hydraulic conductivity correlation scale, and .2 equals vertical log hydraulic conductivity correlation scale. | |
10>B. | Estimates of the variance and standard deviation of head in the aquifer for three-dimensional and one-dimensional flow using equations 27 and 28, where a_{f} ^{2} equals variance of ln K_{r} , J equals horizontal hydraulic gradient, .1 equals horizontal log hydraulic conductivity correlation scale, and .2 equals vertical log hydraulic conductivity correlation scale. | |
11. | Column headings for tables 12-15. | |
12. | Analysis of selected piezometer groups assuming gradual drainage and adjustable saturated thickness, where S_{s} equals specific storage, S_{y} equals specific yield, b equals saturated thickness, K_{r} equals hydraulic conductivity in the horizontal direction, K_{z} equals hydraulic conductivity in the vertical direction, and a_{1}, a_{2}, and a_{3} are empirical constants for gradual drainage from the unsaturated zone. | |
13. | Analysis of selected piezometer groups assuming delayed drainage and fixed saturated thickness, where S_{s} equals specific storage, S_{y} equals specific yield, b equals saturated thickness, K_{r} equals hydraulic conductivity in the horizontal direction, K_{z} equals hydraulic conductivity in the vertical direction, and a_{1}, a_{2}, and a_{3} are empirical constants for gradual drainage from the unsaturated zone. | |
14. | Analysis of selected piezometer groups assuming instantaneous drainage for times greater than 430 minutes and adjustable saturated thickness, where S_{s} equals specific storage, S_{y} equals specific yield, b equals saturated thickness, K_{r} equals hydraulic conductivity in the horizontal direction, and K_{z} equals hydraulic conductivity in the vertical direction. | |
15. | Analysis of selected piezometer groups assuming instantaneous drainage for times greater than 430 minutes with fixed saturated thickness, where S_{s} equals specific storage, S_{y} equals specific yield, b equals saturated thickness, K_{r} equals hydraulic conductivity in the horizontal direction, K_{z} equals hydraulic conductivity in the vertical direction. | |
16A. | Analysis of time-limited tests for all piezometers and deep-seated piezometers, where S_{s} equals specific storage, S_{y} equals specific yield, b equals saturated thickness, K_{r} equals hydraulic conductivity in the horizontal direction, Kz equals hydraulic conductivity in the vertical direction, and a_{1}, a_{2}, and a_{3} are empirical constants for gradual drainage from the unsaturated zone. | |
16B. | Analysis of time-limited tests for long-screened piezometers and piezometer clusters, where S_{s} equals specific storage, S_{y} equals specific yield, b equals saturated thickness, K_{r} equals hydraulic conductivity in the horizontal direction, K_{z} equals hydraulic conductivity in the vertical direction, and a_{1}, a_{2}, and a_{3} are empirical constants for gradual drainage from the unsaturated zone. | |
17. | Various data analyses for piezometers F505-059, F505-080, F504-080, and F383-129, where S_{s} equals specific storage, S_{y} equals specific yield, b equals saturated thickness, K_{r} equals hydraulic conductivity in the horizontal direction, K_{z} equals hydraulic conductivity in the vertical direction, and a_{1}, a_{2}, and a_{3} are empirical constants for gradual drainage from the unsaturated zone. |
AccessibilityFOIAPrivacyPolicies and Notices | |