Practice

Leachate from an unlined landfill cell has reached the water table in a fine sand aquifer. Slug tests and core samples give the aquifer a hydraulic conductivity of $900\,\text{gpd/ft}^2$, a total porosity of 0.32 and an effective porosity of 0.26. The water-table elevations in two monitoring wells $1{,}250\,\text{ft}$ apart along the direction of flow are $732.6\,\text{ft}$ and $729.4\,\text{ft}$. The seepage velocity of the groundwater carrying the leachate is most nearly:

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