Question
1.For a given watershed, you have an annual precipitation estimate of 22 inches and an average discharge rate of 735 cubic feet per second. If
1.For a given watershed, you have an annual precipitation estimate of 22 inches and an average discharge rate of 735 cubic feet per second. If the watershed is 1,000 mi2, what is the annual rate of discharge and ET in inches per year (assume that the system is in a steady state)?
2.A soil has an initial volumetric water content of 0.25 and volumetric water content at saturation of 0.45. How deep will 10 mm of rainfall saturate the soil? What is the porosity of the soil?
3.
Field and oven dry weights for a soil sample are presented in the table below. This sample was taken with a 10-cm long by 5-cm diameter cylindrical tube. Calculate the bulk density, porosity, volumetric water content, gravimetric water content and wetness (i.e., saturation) for this soil (assume that it is a mineral soil with a particle density m.65 g cm-3 and water density of 1 g cm-3).
Soil Sample | Field Weight (g) | Oven-Dry Weight (g) |
1 | 390 | 330 |
4. Create a grain-size distribution curve for the following two soils and determine the type for each soil (use the USDA size fraction distribution to categorize the textures and USDA soil texture triangle to determine texture).
Diameter (mm) | 2.00 | 0.42 | 0.05 | 0.02 | 0.005 | 0.002 |
Sample 1 (% finer) | 100 | 100 | 22 | 20 | 18 | 3 |
Sample 2 (% finer) | 100 | 100 | 58 | 55 | 50 | 47 |
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