Test Rules Answer all questions. Please answer on separate sheets of paper. Reference material. You may refer to one 8.5 x 11 inch page of notes, hand written or printed on both sides that you bring with you. The exam will also include a common formulas and facts document for you to refer to. You may not refer to anything other than your 1 page notes sheet or material provided as part of the exam. Calculator use. You may use a programmable calculator or equivalent calculating device (e.g. calculator functionality on a phone). You should limit the use of the calculating device to the performance of calculations. You may use programs that you have written to evaluate quantities commonly used in this class (e.g. well equations). If you are using your phone as a calculator you may not send s or messages or communicate in any way with anyone other than the instructor or moderator regarding solutions to these questions. You may not use the internet capabilities of the phone during the test.

Flow to a Well in a Confined Aquifer From Mays, 2011, Ground and Surface Water Hydrology Drawdown s Radius of influence, R Note that for steady state flow in a confined aquifer that the radius of influence is an approximate concept as h goes to infinity as r goes to infinity

Example From Mays, 2011, Ground and Surface Water Hydrology A well fully penetrates a 25 m thick confined aquifer. After a long period of pumping at a constant rate of 0.05 m 3 /s, the drawdowns at distances of 50 and 150 m from the well were observed to be 3 and 1.2 m respectively. Determine the hydraulic conductivity and the transmissivity. What type of unconsolidated deposit would you expect this to be? If a contaminant enters the well 50 m away, how long will it take to get to the pumping well.

Range of values of Hydraulic Conductivity From Mays, 2011, Ground and Surface Water Hydrology

Example From Mays, 2011, Ground and Surface Water Hydrology A 1 m diameter well penetrates vertically through a confined aquifer 30 m thick. When the well is pumped at 113 m 3 /hr, the drawdown in a well 15 m away is 1.8 m; in another well 50 m away, it is 0.5 m. What is the approximate head in the pumped well for steady state conditions and what is the approximate drawdown in the well? Also compute the transmissivity of the aquifer and the radius of influence of the pumping well. Take the initial piezometric level as 40 m above the datum

Radial Flow to an Unconfined Aquifer From Mays, 2011, Ground and Surface Water Hydrology

Example From Mays, 2011, Ground and Surface Water Hydrology A well penetrates an unconfined aquifer. Prior to pumping, the water level (head) is h o = 25 m. After a long period of pumping at a constant rate of 0.05 m 3 /s, the drawdowns at distances of 50 and 150 m from the well were observed to be 3 and 1.2 m, respectively. Compute the hydraulic conductivity of the aquifer and the radius of influence of the pumping well. What type of deposit is the aquifer material.

From Mays, 2011, Ground and Surface Water Hydrology Unconfined Aquifer with Uniform Recharge

Example 4.2.5