LAR 512 – Fall 2002
PROBLEM #5 – BASICS IN RUNOFF ESTIMATION
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Download the above graphs and answer the following questions:
1. Using the infiltration graph on page 250:
What is
the final constant infiltration rate with moist antecedent moisture conditions?
__________
2. Using the infiltration graph on page 251:
What is
the final constant infiltration rate with wet antecedent moisture conditions at
the same location as above? __________
3. Please explain why there is this difference?
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4. Using the infiltration graph at top of page 257:
What is
the final constant infiltration rate with moist antecedent moisture conditions?
__________
5. Using the infiltration graph at top of page 257:
What is
the final constant infiltration rate with wet antecedent moisture conditions at
the same location as above? __________
6. Please explain why there is this difference?
____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
7. Please explain
the difference in the soil profile between the site represented by page 250/251
and 257?
____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
8. Please consider a storm event that has a rainfall of the
following:
Time 0 to 10 minutes: intensity of 100-cm/hr
Time 10
to 30 minutes: intensity of 60-cm/hr
Time 30
to 60 minutes: intensity of 50-cm/hr
What is
the total amount of rainfall? __________cm/hr __________in/hr
What is
the total amount of infiltration for this rainfall?
Using graph on page 251: ___________cm
__________in
Using graph bottom page 257: __________cm
__________in
What is
the total amount of runoff for this rainfall?
Using graph on page 251: ___________cm
__________in
Using graph bottom page 257: __________cm
__________in
9. Why is there such a pronounced effect between the two
graphs in terms of amount of infiltration and amount of runoff?
____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________