Study of Groundwater Availability in Case of Drought

by Tiao J. Chang, Ohio Univ, Athens, United States,
Choo B. Teoh, Ohio Univ, Athens, United States,

Abstract: Groundwater drought events were derived by taking truncation levels through the time series of daily drawdown records from observation wells. Droughts of various truncation levels, namely, 70%, 80%, 90%, and 95%, were obtained, where a 70% truncation level means that 70% of the daily value are less than or equal to the truncated value. The conditional probability that a drought of certain truncation level will advance to the next higher level is estimated. Assuming that the conditional probabilities from the selected wells are regionalized variables, the regionalization analyses were conducted. Contour lines for each truncated level were constructed to express the characteristics of groundwater droughts in the region. It was found that estimation errors associated with the contour lines were reasonably small.

Subject Headings: Droughts | Time series analysis | Probability | Case studies | Drawdown (hydrology)

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