CWR4306_Packet_03_master

CWR4306_Packet_03_master - CWR 4306 Urban Stormwater System...

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Lecture Packet 3: Rainfall Intensity-Duration- Frequency (IDF) Curves Course website: http://www.ce.ufl.edu/~markn/CWR4306 CWR 4306 – Urban Stormwater System Design
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A sample rainfall event Figure 1. Temporal distribution of rainfall The average intensity for a given time slice can be computed using the incremental depth for that time slice 1.0 inches 0.2 hr Average intensity = 1.0/0.2 = 5 in/hr
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Rainfall data analysis For the sample storm shown on the previous page the observed average rainfall intensity for the entire storm duration is There are periods of higher intensity and periods of lower intensity, but we assume that the average is a representative “ constant intensity ”. in/hr 1.25 hr 4 in 5 intensity average = =
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Rainfall data analysis Predicting or simulating rainfall patterns § Rainfall occurs in a random pattern—very difficult to predict. § Statistical analysis of historical data provides estimates of average or typical rainfall § Represent expected rainfall as a series of synthetic or theoretical storms
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10-Year 24-hour rainfall Figure 2. 10-Year 24-Hour Maximum Rainfall for Northeast Florida, Inches. Technical Publication SJ88- 3 Rainfall Analysis for Northeast Florida
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25-year 24-hour rainfall Figure 3. 25-Year 24-Hour Maximum Rainfall for Northeast Florida, Inches.
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100-year 24-hour rainfall Figure 4. 100-Year 24-Hour Maximum Rainfall for Northeast Florida, Inches.
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Historical Rainfall Depth and Frequency Figure 5. Bar graph of highest 24-hour rainfall amounts in 100 years of record for a given location. (Note: this is a simplified conceptual representation for a 24-hr, 100-year storm)
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Historical Rainfall Depth and Frequency From the chart of historical data we can see that only one storm produced 6.5 in 24 hours
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CWR4306_Packet_03_master - CWR 4306 Urban Stormwater System...

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