CE En 547 - Midterm Exam #2 KEY

Fall Semester 2019

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1. (1.5 pt each) True or False:

a. T F  (modflow) One way to deal with a layer corresponding to a pinchout in MODFLOW is to simply set the thickness of the cells to zero in the regions of the model where the pinchout does not exist.

b. T F  (calibration) A model is calibrated when the mean error (ME) is equal (or close to) zero.

c. T F  (calibration) It is possible to fix the value of a pilot point to a measured K value at a test well.

d. T F  (calibration) Pilot points should not be placed between observation wells and fixed head boundaries.

e. T F  (gms) A polygon in the GMS map module must be enclosed by two or more arcs.

f. T F  (gms) When building a conceptual model using the GMS Map Module, you are free to organize the different types of feature objects into coverages in any manner you wish, as long as polygonal data are put into separate coverages.

g. T F  (gms) When building a GMS conceptual model, vertices are simply used to define the geometry of an arc and do not have any properties related to MODFLOW input.

h. T F  (calibration) The weight associated with an observation (either head or flow) is directly proportional to the size of the calibration target assigned to the observation in GMS.

i. T F  (calibration) The error norm that is minimized by the PEST utility is the Root Mean Square Error.

j. T F  (calibration) For a losing river, the sign associated with observed flow assigned to a river arc in a GMS conceptual model should be negative.