A model is presented for optimizing the number and locations of wells for various hydrologie and reservoir conditions. It can handle confined or unconfined aquifers, leaky or non-leaky aquifers, isotropic or anisotropic permeabilities, existing wells at fixed or model-determined optimal flow rates, complex boundaries, and specified regions to be excluded from possible well location sites for environmental or other reasons.

Examples demonstrate that optimum wellfield design differs significantly from the patterns widely used in the gas industry. Optimum patterns depend heavily on the reservoir and hydrologie characteristics of the target, the shape of the project site, existing wells, the total number of wells, and water pressure drop in the coal seam required to commence gas flow.

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