Multiple choice (circle the best answer) and short answer (2pts each, if not sur
ID: 1845535 • Letter: M
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Multiple choice (circle the best answer) and short answer (2pts each, if not sure, write what you know for partial credit) The total rainfall once evaporation has been accounted for. The intensity of rainfall associated with a unit hydrograph. Excess rainfall that is converted to runoff. The term "net rainfall" is best defined as follows: The portion of gross rainfall that is lost to infiltration. Reduced mobility of a contaminant due to interaction with aquifer media. Adsorption (sorption) of dissolved contaminants in groundwater can be characterized by: Permanent removal from water after being attached to the solid phase. Irreversible movement to solid phase of organic matter or iron hydroxides on mineral particle Contaminant attraction to charged surface sites, irrespective of pH. Choose the correct statement about storage in an aquifer: Storage coefficient is the volume of water that an aquifer releases or takes into storage per unit surface area per unit change in piezometric head and is measured in feet You can determine the storage coefficient in a constant rate pumping test in a confined aquifer by plotting the drawdown in the pumping well against time using the Cooper-Jacob method. Specific yield is the storage coefficient equivalent for unconfined aquifers and typically would be a little less than the effective porosity of a sandy aquifer. Storage coefficients range from 0.10 to 0,25 and specific yields range from 0.005 to 0.00005. Chose all the correct statements concerning the Dupuit Equations: They describe flow for either confined or unconfined aquifers. They can be used to calculate one-dimensional flow per unit width. They can be used to calculate the maximum head under recharge conditions. The Dupuit parabola is an exact match to the water table surface shown in one dimension. Draw arrows to show the flow directions on this portion of a Digital Elevation Model. Be careful to show flow towards the lowest elevation in an adjacent cell. Show stream network on the second grid by giving number of cells contributing flow to each cell (don't include the receiving cell in the count). You may refer to Ses. 13 notes or Figure 10-7 in the text for an example. Which best describes why boundary and initial conditions are needed in a finite-difference computer groundwater model: To demonstrate how the computer model matches the conceptual model developed from actual field data. To give starting and some fixed values for unknowns in simplified algebraic equations calculating head and flow over multiple iterations at adjoining cells. To make sure that the groundwater stays within the confines of the model (i.e. constant head boundaries). To provide the coefficients that are needed in groundwater flow equations.Explanation / Answer
1. answer is c)
2. a)
3. a)
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