CE 383 Exam 2 Pt 3 Question and
answers verified to pass 2025/2026
Runoff - correct answer ✔Excess rainfall
time of concentration - correct answer ✔time for entire watershed to contribute to flow at the outlet
or
longest travel time for a drop of runoff to reach outlet
Decreases w/ more impermeable
Lower tc = higher peak runoff
P24 is 2yr 24hr storm regardless of problem
Shallow concentrate occurs when - correct answer ✔Sheet flows converges from multiple directions
Sheet flow is intercepted by shallow swales, rills, and gullies
After 300 ft of sheet flow
NRCS rainfall types - correct answer ✔Type I and Ia: on west coast
Type II: Most of US (most likely to flood, highest peak)
Type III: coastal areas
When calculating tc w/ multiple areas - correct answer ✔Calculate the tsf, tsc, and toc for each change
in geometry or material
Rational method assumptions - correct answer ✔1. Q proportional to i
answers verified to pass 2025/2026
Runoff - correct answer ✔Excess rainfall
time of concentration - correct answer ✔time for entire watershed to contribute to flow at the outlet
or
longest travel time for a drop of runoff to reach outlet
Decreases w/ more impermeable
Lower tc = higher peak runoff
P24 is 2yr 24hr storm regardless of problem
Shallow concentrate occurs when - correct answer ✔Sheet flows converges from multiple directions
Sheet flow is intercepted by shallow swales, rills, and gullies
After 300 ft of sheet flow
NRCS rainfall types - correct answer ✔Type I and Ia: on west coast
Type II: Most of US (most likely to flood, highest peak)
Type III: coastal areas
When calculating tc w/ multiple areas - correct answer ✔Calculate the tsf, tsc, and toc for each change
in geometry or material
Rational method assumptions - correct answer ✔1. Q proportional to i
