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CEE 3274 Land Development Final 2024 questions with 100- correct answers
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CEE 3274 Land Development Final 2024 questions with 100- correct answers
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CEE 3274 LandDevelopment
Final 2024
questions with
100% correct
answers
Hydrograph vs Hyetograph - answer Hydrograph
- Plot of discharge, Q, versus time
Hyetograph
- Plot of rainfall intensity versus time
,Rainfall Characteristics - answer Duration
- How long does the storm event last (min or hr)
Volume
- How much rain falls (cf)
Intensity
- What is the rate of rainfall (in/hr)
Frequency
- Important thing to know: is a statistical probability
- What is the statistical probability that a storm of a
specified magnitude will occur (year)
Return Frequency - answer The average time
between events of the same volume and duration
Exceedance Probability, P - answer The probability
that a storm of a specified volume and duration will
be observed or exceeded in a given year.
,Return Frequency (T) and Exceedence Probability
(P) Relationship - answer P = 1/T
- there is a 50% chance that a 2 yr return
frequency storm will be observed in a year
Intensity Duration and Frequency (IDF)
Relationships - answer - The relationship between
rainfall intensity, duration, and frequency (IDF) is
location dependent
- Storm with a higher rainfall intensity have less
probability of occurring
- The longer the durations of storm, the less
intense it is
- The national Oceanic and Atmospheric
Administration (NOAA) publishes rainfall depths for
various return frequencies and duration
Estimating Runoff
(methods) - answer Rational Method
, - Drainage basins <200 acres
- Computes peak discharge, not a full hydrograph
NRCS TR-55
- Can be used to compute a full hydrograph
- Used for detention basin size estimation
Area-Weighting the C Coefficient - answer - Rarely
will a watershed be homogenous in land use
- Varying land covers are depicted by their
respective C coefficient and area-weighting is
performed to determine a coefficient
representative of the entire watershed
- Weight the C coefficient from the table by the
slope
≤ 2% use low range
2% < S ≤ 5% use average
< 5% use high range
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