EESA01H3 Lecture 6: Lecture 6

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12 Jan 2012
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Lecture 6 y main input is precipitation and main output is evapotranspiration. y another input is runoff (surface runoff, groundwater). y 2 ways of thinking of surface runoff. 1) as a process: it is water running off the surface. Only if under pressure so almost never it goes up. 2) input or output. y generally movement of water outside boundary is via stream/river flow. Streams convey runoff from place to place. y urban systems flashy with runoff (meaning a lot of p (? y water beneath the ground. y upper limit of where it is filled with water is the water table. This is saturated. y top layer is unconfined aquifer and bottom is confined. y aquifer conveys significant amounts of water. Water draining through ground or recharged in that aquifer. Confined aquifer is further beneath. y main difference between confined and unconfined is size of recharge area. y groundwater is main fresh water input to billions of people.

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