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Homework04 - CE 3101 Fall 2011 Homework 04 Construction...

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CE 3101 Fall 2011 Homework 04 – Construction Dewatering Due Tuesday, 4 October 2011, 11:55 P.M. (This is a 25 point group assignment.) Abstract In self-selected groups of up to three members, you will write an Excel spreadsheet program to assist you in the optimal design of a construction dewatering system comprising four wells around a circular excavation. You must select the location and pumping rates of the four wells so that the water table is below the floor of the excavation. A full written report is required in addition to the working code. In this assignment you are solving a specific engineering problem, you are not creating a general tool for future use. Group Evaluation and the Time Card After completing this assignment you are each required to INDIVIDUALLY complete the Homework 04 Group Evaluation , found on the course Moodle web site. As with the previous assignments, time tracking should be recorded to the nearest 15 minutes (1/4 hour). Your time tracking is to be reported via the online questionnaire. Background In this problem you are going to design (i.e. locate and size) a construction dewatering system 1 . This is based upon a real problem from engineering practice, therefore, this is NOT an easy 2 problem. The underlying math is a bit messy, but it is not particularly difficult 3 . The difficulty in this problem comes from the need for creative thinking and engineering problem solving skills 4 . Before you run to the computer lab and start programming, you must read the problem statement carefully, sit and think about the problem, discuss it in your group, and design your problem solving strategy. There are also a number of computational “gotcha’s” throughout this problem. I have attempted to identify these potential sticking-points, and proposed solutions and work-arounds. I am not intentionally setting you up to fail. I have not intentionally hidden artificial difficulties in the problem. Nonetheless, you MUST implement your solution strategy with care: keep your eyes open and your minds alert. Setting A dewatering system, consisting of four (4) extraction wells 5 , will be used to obtain dry working conditions in a construction excavation in an unconfined aquifer. So as not to interfere with construction, the wells may not be placed in the excavation. The wells may, however, be placed just on the edge of the excavation, or almost anywhere around the exterior of the excavation. The aquifer is unconfined on top and lies on a horizontal impermeable base. The aquifer is bounded on the west by a long straight river. The elevation of the river, h R , is constant and equal to 35 [ m ] above the base of the aquifer. Prior to this construction project, the groundwater table was equal to the elevation of the river throughout the area. The hydraulic conductivity , k , of the homogeneous, isotropic aquifer is 3 [ m/day ] .
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