Hantush Type Curve
Hantush Leaky Aquifer Type Curve
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The Hantush type curve method is suitable for leaky or semi-confined aquifers. Matching to the type curves allows for an estimate for the relation between aquifer parameters and aquitard parameters.
Estimating Beta for the Hantush Type Curve
For the Hantush curve fitting method, Beta is a value dependent on the thickness, hydraulic conductivity, and storativity of the aquifer and aquitard, and the radial distance to the observation well.
Beta is determined by the following equation:
where:
r = radial distance to the observation well
k = hydraulic conductivity of the aquifer
k' = hydraulic conductivity of the aquitard
D = thickness of the aquifer
D' = thickness of the aquitard
S = storativity of the aquifer
S' = storativity of the aquitard
One disadvantage of using the Hantush type curve method alone is that an estimate of the storativity of the aquitard is required to calculate the hydraulic conductivity of the aquitard. By using the Hantush method in conjunction with other leaky aquifer methods, a value of storativity of the aquitard can be estimated.
After data has been matched to a type curve, an estimate of Beta is required to determine the leakage factor. Estimate Beta from the type curve that best fits the data curve. As Beta approaches zero, the Hantush method approximates the Theis solution.