Environ. and Conserv. Hydrology Name___________________

Environ. and Conserv. Hydrology Name____________________

GGE 303 Test II, Spring 1998

1. (15) a. Draw or sketch Theissen polygons around the array of points shown below.

b. Explain the procedure you used to draw the polygons.

c. Briefly explain how Theissen polygons can be applied to regional studies of precipitation.

3. (10) List four main sources of nitrogen oxides found in the atmosphere. Rank them according to the size of their contribution.

largest__________________________________________________________

________________________________________________________________

_________________________________________________________________

smallest_________________________________________________________

4. (10) Large, widely-spaced, plate-like crystals of ice may form within a snowpack under very cold atmospheric conditions (depth hoar). Briefly describe the physical process(es) that lead to this type of constructive metamorphism.

5. (15) Describe the characteristics of the following snowfall/snowmelt phases or periods:

accumulation

warming

ripening

output

6. (25) The following page shows some precipitation and hypsometric data from the region near Delta Junction, Alaska.

a. Explain how a hypsometric curve can be constructed.

b. Carefully list the steps used in estimating average precipitation for the region.

_______________________________________________________________________

c. Estimate the average precipitation from the data provided. (Show your work).

Hydrology GGE 342 Name__________________

Test II, 100 pts. Spring 2001

1. (30) What is evapotranspiration and how is it measured?

2. (15) Determine the elevation head, pressure head, total hydraulic head, and the pore water pressure for the three points shown below

3. (15) The Pierre shale (hydraulic conductivity, K = 5 x 10^-2feet day^-1; porosity = 0.15) confines the underlying Dakota sandstone. A piezometer nest and associated hydraulic heads are shown below. Is groundwater moving upward or downward through the shale? How many cubic feet of water move through one square foot of the geological contact (interface between the shale and sandstone)?

4. (20) Sketch a flow net beneath the dam shown below. If the dam is 100 feet long and the sediments below the dam have a K = 0.1 m day^-1, approximately how much water seeps beneath the dam per day? As best you can, draw in the water level you would expect for well B.

5. (5) Write down a hydrology-related question that you were ready to answer, but did not find on this test.

6. (15) Answer the question in part 5.