Frequency Analysis of Shallow Water Tables for Drainage Applications

by David A. Chin, (F.ASCE), Professor; Dept. of Civil, Architectural, and Environmental Engineering, Univ. of Miami, Coral Gables, FL 33124.,,

Serial Information: Issue 6, Pg. 491-497

Document Type: Journal Paper

Abstract: In coastal areas with shallow aquifers, the minimum elevation of newly developed land is typically required to exceed the water-table elevation corresponding to a given return period. Determination of this regulatory water-table elevation usually requires a nonstationary frequency analysis of measured water-table elevations. In this paper, a simple and effective power-transform frequency-analysis procedure for extracting the requisite regulatory water-table elevation is presented and demonstrated. This procedure identifies the critical period yielding the maximum water-table elevation for a given return period, which is a robust regulatory elevation that might not need frequent updates. The assumptions underlying the proposed power-transform frequency-analysis procedure are shown to be valid at 23 of the 24 wells investigated in this study.

Subject Headings: Water table | Drainage | Frequency analysis | Shallow water | Flood frequency | Aquifers | Land use | Sea water | Wells (water) |

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