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https://www.youtube.com/watch?v=zol3bZZGRFQ
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https://www.ndspro.com/static/version1537272418/frontend/Nds/default/en_US/images/stories/pdfs/drainage/definitive-drainage-guide.pdf
The Rational Method equation is: Q = C x I x A where: Q = Storm Water Runoff (in cubic feet per second) C = Coefficient of Runoff I = Rainfall Intensity (in inches per hour) A = Area of Drainage Zone (in acres) The equation above can be modified to give you runoff in gallons per minute.
https://www.josam.com/images/josammkt/zzother/C07_pgrd7.pdf
For example, a 3 inch per hour rainfall will build up to a 3 inch depth on a flat roof in one hour, at the rate of 1.87 gallons per hour/sq. ft. or .0312 gallons per minute/sq. ft. (See Figure 7). Using a 10,000 sq. ft. roof area, the 3 inch rainfall will produce 18,700 gallons in one hour at the rate of 312 gallons per minute. See the following.
https://www.mifab.com/Catalog/Library/US/Rainfall-Rates_U.S._Cities-2019.pdf
design purposes. National rainfall rate information is provided in the chart below, listing rainfall rates in millimeters per hour for selected cities. When the rainfall rate for the locale of the project has been resolved, sizing of the roof drains, leaders …
https://www.bestmaterials.com/PDF_Files/DRAIN-SIZING.pdf
Example: The location of Kansas City, MO shows 6" of rainfall per hour. 4.) Select a reference of a roof drain size with hourly rainfall together with the roof area square footage you have estimated and then determine from the chart below how many roof drains you require. Example: Each 4" drain size in a 6" hourly rainfall area will accommodate drainage of 3,070 sq. ft. of roof area. …
https://www.youtube.com/watch?v=ekXFslHOvZ8
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https://www.zurn.com/media-library/web_documents/pages/technicalinformation/roofdrains/rd5-pdf.aspx
STORM DRAINAGE SIZING PRECIPITATION RATE INCHES/HOUR – BASED ON 15-MINUTE PRECIPITATION Zurn makes it easy to size roof drains. The four things you will need to know are: 1) rate of precipitation; 2) total area of roof; 3) size of leader required; and 4) area handled by each drain. When sizing roof drains, the limiting factor for the amount of water
https://www.neavegroup.com/blog/storm-water/5-poor-drainage-solutions-to-divert-water-away-from-your-house/
Drainage Solutions To Drain Water Away From Your Home Your property needs to be able to handle the amount of stormwater and rainfall it receives, so extra water doesn’t cause costly damage. There are a variety of solutions, depending on the exact problem and the characteristics of your property.
http://www.roofdepotusa.com/drainage.pdf
the drain. Include ½ the area of any wall that will divert rainwater to the roof. (P1106.4)(1617.3) Use Table 1106.2 to cross reference rainfall rate and projected roof area, then read necessary drain size from the Table.
https://www.zurn.com/media-library/web_documents/pages/technicalinformation/roofdrains/rd-cvr-21-pdf.aspx
leader. Example: For a 4" hourly rainfall and 4" leader, each drain can handle 4,600 sq. ft. of roof area. Step 4: Divide total roof area by area found in Step 3 to obtain the number of drains required.Example: 150,000 sq. ft. divided by the 4,600 sq. ft. equals 32.6, or 33 drains required. The drains should be equally spaced and located symmetrically
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