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Hydrology Design Problem 1 - Determine stormwater runoff from a watershed:
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Given a 600'x600' rural parcel of pasture land located in Region 1, determine the 10 year stormwater discharge to size a culvert that will be located
on the SE corner of the property. Use the Steel formula and rational method to determine Q. |
1. From the hydrology submenu open the overland flow time of concentration calculation, TcOverland.aspx. Input the "Title" of the calculation, the "Designer/Checker" information and the variables.
Next open the reference tables and determine the intercept coefficient, k for pasture land. Next enter the remaining variables and click on the "Calculate" button. Read the results. The time of concentration,
Tc is 28.63 minutes.
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2.
From the hydrology submenu open up the Steel Formula rainfall calculation, Rainfall.aspx. Input the "Title" of the calculation, the "Designer/Checker" information and the variables.
The table on the calculation has the variables for Region 1 and a 10 year storm. Click on the "Calculate" button and read the results. The rainfall intensity is 4.642 in/hr.
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3. From the hydrology submenu, open up the rational method discharge calculation, Rat.aspx. Input the "Title" of the calculation, the "Designer/Checker" information.
Open up the reference table and determine the runoff coefficient, C. Input the variables, click on the "Calculate" button and read the results. The stormwater discharge is 0.575 cfs.
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4. Summary
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The discharge for a 10 year storm from this 600' x 600' parcel of pasture land located in region 1 is 0.575 cfs.
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