9.9. As shown in the sketch below, an unconfined aquifer on a hillside drains into a stream. The aquifer has an average saturated thickness of 3.0 m (9.8 ft), has a hydraulic con- ductivity of 0.30 m/day (1.0 ft/day), an effective porosity of 0.20, and a slope of 0.03. Compute the maximum seepage into the stream per km (mi.) considering seepage is from both sides of the channel. Compute the travel time for water to flow from the ridge to the channel 300 m (984 ft).

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Unit Conversion

Standard units are also called SI units. SI units are used for measuring a physical quantity satisfying certain conditions. There are two types of units: fundamental units and derived units. Fundamental units are physical quantities that are independent, that is, they do not depend on other quantities like mass, length, or time. There are plenty of quantities in our lives which need to be measured and compared. Measuring is the comparison of a particular physical quantity with its reference value. A unit is a measure of a fixed physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.