A drainage basin for a culvert has six contributing areas as
shown in the figure below.
Runoff from each area collects at a central drainage ditch which
conveys flow to the
culvert (i.e., flow path from Area A goes from Area A to Point 1,
Point 1 to Point 2, and
from Point 2 to the culvert). The table below indicates the
overland flow times for the
drainage basin. For a 25-year design storm, what design rainfall
intensity (in/hr) should
be used at the culvert (IDF curve for the basin provided
below):
A Drainage Basin For A Culvert Has Six Contributing Areas As Shown In The Figure Below Runoff From Each Area Collects A 1 (67.64 KiB) Viewed 43 times
Segment of Drainage Basin Area A to Point 1 Area B to Point 1 Area C to Point 2 Area D to Point 2 Point 1 to Point 2 Point 2 to Culvert Intensity (in/hr) Overland Flow Time (min) 12 8 4 6 2 1 A ||-||- Culvert- 25-yr average frequency Drainage Ditch D Point 1 Point 2 10-yr average frequency I -5-yr average frequency 2-yr average frequency 0 10 20 30 40 50 60 70 80 90 100 110 120 Duration (min)
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