EESC07H3 Lecture Notes - Lecture 5: Fluid Dynamics, Hydraulic Head, Aquifer
13 Feb 2018
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Storage is a term that becomes important only when the time variant flow or transient flow is considered. Since q = -kia, q = -tiw: where w is the lateral extent of the aquifer. Typical values of t: fissured limestones: 500 10000 m2/d, sandstones: 50 1000 m2/d, sands and gravels: 50 5000 m2/d. If you pump up 100% of water in a system, you disturb the downstream effects, i. e. it could have been feeding a river, pumping water into a marsh, providing groundwater flow into a river for fish. Safe yield is no more than 50%. For ken howard, safe yield to pump water is 10%, 90% will still do its own job. Up until now, we only have considered steady-state flow. i. e. the magnitude and direction of the flow velocity at all points in a flow field remains constant with time.
