Practice Quiz

FE Civil Engineering Exam Prep

Category - Civil Engineering

Start a Study Session Sign up for Question of the Day
What is the composite C value for the following drainage area for a 10-year storm recurrence interval?Drainage area: 0.25 acres of residential lots with 40% imperviousness (C = 0.49) 0.25 acres of lawn with 0.95% slope with 0% imperviousness (C = 0.22) 0.10 acres of impervious pavement (C = 0.95)
  1. 0.20
  2. 0.45
  3. 0.55
  4. Not enough information provided
Explanation
Answer: B - The composite C value for the given drainage area for a 10-year storm recurrence interval is 0.45.

Solution: Calculate composite C by using the following equation:

C = (C1A1 + C2A2 + C3A3) / (A1 + A2 + A3)

C = [(0.25 acres x 0.49) + (0.25 acres x 0.22) + (0.10 acres x 0.95)]/ (0.25+0.25+0.10)

C = 0.45
Previous Next
Was this helpful? Upvote!
Login to contribute your own answer or details
Start a Study Session Sign up for Question of the Day

Top questions

Related questions

Most popular on PracticeQuiz