EESC07H3 Lecture Notes - Lecture 8: Specific Storage, Hydraulic Head, Aquifer Test
13 Feb 2018
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Document Summary
Bentonite swells so contaminants don"t get into the ground water. Static water level [swl] (h0), initial water level before pumping commences. Pumping water level [pwl] (h), water level during pumping. Drawdown (s = h0 h), is the different between [swl] and [pwl], change in potentiometric head, degree to which water level drops. We will focus on this with a function of time: r represents the distance from the centre of the well to where you measure the drawdown (dependant on slope/radial). Swell, we want to make sure our pump is below the maximum. Specific capacity (q/swell), the yield per unit drawdown, where swell is the drawdown in the pumping well. We need a steeper gradient to develop the same type of q in a setting with a high k (that has a low gradient). Pumping a zone of low hydraulic head, water goes from high pressure to low pressure, like you drinking from a straw.
