HHA1 - Homework #1 Due Feb 2, 2011 Porosity and Hydraulic...

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Homework #1 Due Feb 2, 2011 Porosity and Hydraulic Conductivity30 points -------------------------------------------------------------------------------------------------- Objectives: Use experiments to help visualize groundwater flow, become more familiar with groundwater concepts, including effective porosity, specific yield, Darcy’s l;aw, hydraulic head, and hydraulic conductivity. Background on Darcy’s Law: In the 1850’s, Henry Darcy, an engineer, investigated how water flowed through various types of sand. He put sand in a cylinder, added “wells” to measure the hydraulic head, and then measured the discharge (the volume per time), Q, through the cylinder. He found that the discharge increased linearly as the hydraulic gradient, i= (h 1 - h 2 29 / l increased. And has the cross-sectional area, A, increased:: Q=KiA In groundwater studies, a commonly used term is specific discharge, q , which is the discharge per unit area.(q =Q/A). So Darcy’s law can also be written as: q = Ki In this experiment you won’t measure discharge. Instead you will use velocity to calculate hydraulic conductivity of two types of sediment. How does discharge (Q) relate to velocity (v)? In a river or a pipe, discharge (Q)= vA. In an aquifer, the sediment grains block most of the cross-sectional area, so: Q=vAn e or q=vn e
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You will work in groups (up to 4 people/group). Answer on a separate sheet of paper. For calculations, always circle or underline your final answer, and show units (even if the question asks for specific units!). Use a reasonable number of significant digits. I will take 2 points off the assignment if you repeatedly give answers with more 2 or more “excess” digits. Part I: Porosity and Specific Yield You have samples of two types of material. One is the same as the sediments in the confined aquifer and the other is the same as the sediments that make up the unconfined aquifer. 1.
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HHA1 - Homework #1 Due Feb 2, 2011 Porosity and Hydraulic...

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