CE En 547 - Final Exam KEY

Fall Semester 2018

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1. (1 pt each) True or False:

a. T F  (gw-concepts) A post-audit is when you adjust your model inputs until the model outputs match your field observed values (heads and flows).

b. T F  (modpath) When performing a particle tracking analysis with MODPATH, the porosity values assigned to cells should correspond to effective porosity.

c. T F  (modflow) The active/inactive region in MODFLOW is controlled through the IBOUND array.

d. T F  (calibration) The mean absolute error is typically smaller than the mean error.

e. T F  (transient) Specific yield is generally smaller than specific storage

f. T F  (transient) MODFLOW stress periods are subdivided into time steps, but it is possible to have only one time step per stress period.

g. T F  (calibration) When establishing an observed flow based on field measurements for a section of a river, the observed flowrate should be entered as positive value if it is a gaining river.

h. T F  (head-darcy) Seepage velocity is greater than Darcian velocity.

i. T F  (head-darcy) When flowing perpendicular to the layering, the overall flow rate will be controlled by the layer with the lowest value of hydraulic conductivity.

j. T F  (gms) The Grid Frame tool in GMS should only be used when you are using refine points to control the distribution of row and column widths in your model grid.

k. T F  (transient) The storage coefficient used in transient models increases as the stiffness of the soil increases.

l. T F  (stochastic) Hydraulic conductivity is typically log-normally distributed.

m. T F  (modpath) When particle tracking with MODPATH, the velocity of the particle is proportional to the effective porosity.

n. T F  (modflow) A losing river results in an elevated water table (mounding) underneath the river when simulated with the MODFLOW River package.

o. T F  (sustain) The closer a new set of wells is located to an aquifer's discharge zones, the longer it will take for the system to reach a new state of equilibrium.