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How many inches is an acre foot of water? This means no more than 2.5 gallons of water should flow out each minute. Since 1992, a maximum of 2.5 GPM is the federally mandated flow rate for new shower heads. Also known as "flow rate", GPM is a measure of how many gallons of water flow out of your shower head each minute. The mass flow rate is simply the fluid density multiplied by the volumetric flow rate, or: m = ρQ = ρVA, where ρ = the density of the fluid. V = Q/A, or Q = VA, where V is the average velocity and A is the cross-sectional area of the fluid perpendicular to flow. Thus, the velocity v in feet per second is equal to 0.408 times the flow rate Q in gallons per minute divided by the pipe diameter D in inches squared. * 1 cfs will produce 724 acre-feet of water per year.Īlternatively, if the flow rate is measured in gallons per minute, the following formula can be used to calculate water velocity. * 1 cfs is equivalent to 448.8 gallons of water flowing per minute. For water that is stored or impounded, the acre-foot (af) is how water is measured. Multiply the gallon per minute rate by 60 to find the gph rate: 4 times 60 equals 240 gph.įor water that is in motion, cubic feet per second (cfs) is the unit of measure. Divide the timed rate by 60 to find the gallon per minute rate: 60 divided by 15 equals 4. How do you calculate GPH water flow rate?įor example, consider your pump is able to fill the gallon container within 15 seconds. gallons US per minute to cubic feet per second = 0.0067 cu ft/sec. gallons US per minute to cubic feet per second = 0.0045 cu ft/sec. How do you convert GPM to cubic feet per second?Ĭonversion chart - gallons US per minute to cubic feet per second gallon US per minute to cubic feet per second = 0.0022 cu ft/sec. To find the velocity of the fluid flow, multiply the differential pressure by two and divide this number by the density of the flowing material. How do you convert differential pressure to flow?
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Another way of getting two-thirds of a number, is to start with the whole fps number, and subtract one-third from it: FPS - (FPS / 3), 6 - (6 / 3), 6 - 2 = 4 mph. Putting in all together into a formula: MPH = FPS / 3 x 2.
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It is the EQUAL flow rate value of 1 acre foot per day but in the gallons US per minute flow rate unit alternative. The gallons US per minute unit number 226.29 gal/min converts to 1 ac-ft/d, one acre foot per day. How many gallons per minute are in a acre foot? The conversion appears in "teal" in the opposite box.Ĭonversion formulas Cubic feet per second, US gallon per minute (cfs, ft3/s, gpm): cfs= 448.8325660485*gpm. To operate, enter the number you wish to convert in either manually entry box. For example:water depth = 1.5 inchesweir width = 3 feetflow estimate = 3 x 66 or 198 gallons per minuteįrom: King’s “Handbook of Hydraulics”, Fourth Edition, Table 36.CFS to AF CONVERSION INSTRUCTIONS This program easily and conveniently converts cubic-feet-second to acre-feet per year and vice versa. Once the average depth and the width of the water over the weir is measured with a ruler (Figure 1), use the table to estimate the flow. In a stream without such a device, a wooden board (1 inch x 6 inches or 1 inch x 8 inches) can be placed on edge in the stream from bank to bank so that the water flows over the board. *cfs = cubic feet per second*gpm = gallons per minuteUse the above table to estimate the water flow over damboards or similar devices. Please note that some applications and/or services may not function as expected when translated. NC State Extension does not guarantee the accuracy of the translated text. As with any Internet translation, the conversion is not context-sensitive and may not translate the text to its original meaning.
#CFS TO GPM FREE#
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