Estimating hydraulic properties of volcanic aquifers using constant-rate and variable-rate aquifer tests
Journal of the American Water Resources Association
By: K. Rotzoll, A. I. El-Kadi, and S. B. Gingerich
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Abstract
In recent years the ground-water demand of the population of the island of Maui, Hawaii, has significantly increased. To ensure prudent management of the ground-water resources, an improved understanding of ground-water flow systems is needed. At present, large-scale estimations of aquifer properties are lacking for Maui. Seven analytical methods using constant-rate and variable-rate withdrawals for single wells provide an estimate of hydraulic conductivity and transmissivity for 103 wells in central Maui. Methods based on constant-rate tests, although not widely used on Maui, offer reasonable estimates. Step-drawdown tests, which are more abundantly used than other tests, provide similar estimates as constant-rate tests. A numerical model validates the suitability of analytical solutions for step-drawdown tests and additionally provides an estimate of storage parameters. The results show that hydraulic conductivity is log-normally distributed and that for dike-free volcanic rocks it ranges over several orders of magnitude from 1 to 2,500 m/d. The arithmetic mean, geometric mean, and median values of hydraulic conductivity are respectively 520, 280, and 370 m/d for basalt and 80, 50, and 30 m/d for sediment. A geostatistical approach using ordinary kriging yields a prediction of hydraulic conductivity on a larger scale. Overall, the results are in agreement with values published for other Hawaiian islands. ?? 2007 American Water Resources Association.
Suggested Citation
Rotzoll, K., El-Kadi, A., Gingerich, S.B., 2007, Estimating hydraulic properties of volcanic aquifers using constant-rate and variable-rate aquifer tests: Journal of the American Water Resources Association, v. 43, no. 2, p. 334-345, https://doi.org/10.1111/j.1752-1688.2007.00026.x.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Estimating hydraulic properties of volcanic aquifers using constant-rate and variable-rate aquifer tests |
| Series title | Journal of the American Water Resources Association |
| DOI | 10.1111/j.1752-1688.2007.00026.x |
| Volume | 43 |
| Issue | 2 |
| Publication Date | March 15, 2007 |
| Year Published | 2007 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of the American Water Resources Association |
| First page | 334 |
| Last page | 345 |