SmartDraw is the easiest way to make any type of flowchart or diagram representing a process. You start by picking one of the flow chart templates included and add steps in just a few clicks. MODFLOW is a popular open-source groundwater flow model distributed by the U.S. Geological Survey. For over 30 years, the MODFLOW program has been widely used by academics, private consultants, and government scientists to accurately, reliably, and efficiently simulate groundwater flow.
We regularly get asked about the water flow capacity of different pipe sizes, and which is the best roof drain for a specific pipe size. Unfortunately, recommendations aren't that straightforward because you also need to account for water pressure, material friction and more.
That said, we put together the following tables to serve as general guides for estimating a pipe's water flow capacity. If you have questions, please call our Drain Wizard at 800-635-0384.
Water Flow (GPM/GPH) based on Pipe Size and Inside/Outside Diameters
| Assume Gravity to Low Pressure. About 6 f/s flow velocity, also suction side of pump | Assume Average Pressure (20-100PSI). About 12 f/s flow velocity | Assume 'High Pressure' PEAK flow. About 18 f/s flow velocity |
| Pipe Size (Sch. 40) | I.D. (range) | O.D. | GPM
(w/ min. PSI loss & noise) | GPH
(w/ min. PSI loss & noise) | GPM
(w/ min. PSI loss & noise) | GPH
(w/ min. PSI loss & noise) | GPM
(w/ min. PSI loss & noise) | GPH
(w/ min. PSI loss & noise) |
| 1/2' | 0.5 - 0.6' | 0.85' | 7 | 420 | 14 | 840 | 21 | 1,260 |
| 3/4' | 0.75 - 0.85' | 1.06' | 11 | 660 | 23 | 1,410 | 36 | 2,160 |
| 1' | 1 - 1.03' | 1.33' | 16 | 960 | 37 | 2,200 | 58 | 3,480 |
| 1-1/4' | 1.25 - 1.36' | 1.67' | 25 | 1,500 | 62 | 3,750 | 100 | 6,000 |
| 1-1/2' | 1.5 - 1.6' | 1.9' | 35 | 2,100 | 81 | 4,830 | 126 | 7,560 |
| 2' | 1.95 - 2.05' | 2.38' | 55 | 3,300 | 127 | 7,650 | 200 | 12,000 |
| 2-1/2' | 2.35 - 2.45' | 2.89' | 80 | 4,800 | 190 | 11,400 | 300 | 18,000 |
| 3' | 2.9 - 3.05' | 3.5' | 140 | 8,400 | 273 | 16,350 | 425 | 25,500 |
| 4' | 3.85 - 3.95' | 4.5' | 240 | 14,400 | 480 | 28,800 | 700 | 42,000 |
| 5' | 4.95' - 5.05' | 5.563' | 380 | 22,800 | 750 | 45,000 | 1,100 | 66,000 |
| 6' | 5.85 - 5.95' | 6.61' | 550 | 33,000 | 1100 | 66,000 | 1700 | 102,000 |
| 8' | 7.96' | 8.625' | 950 | 57,000 | 1900 | 114,000 | 2800 | 168,000 |
Water Flow (GPM) Capacity Based on ID Size and Pressure
| PRESSURE | FLOW IN GPM THROUGH PIPE ID IN INCHES |
| PSI | 1' | 1.25' | 1.5' | 2' | 2.5' | 3' | 4' |
| 20 | 26 | 47 | 76 | 161 | 290 | 468 | 997 |
| 30 | 32 | 58 | 94 | 200 | 360 | 582 | 1240 |
| 40 | 38 | 68 | 110 | 234 | 421 | 680 | 1449 |
| 50 | 43 | 77 | 124 | 264 | 475 | 767 | 1635 |
| 60 | 47 | 85 | 137 | 291 | 524 | 846 | 1804 |
| 75 | 53 | 95 | 153 | 329 | 591 | 955 | 2035 |
| 100 | 62 | 112 | 180 | 384 | 690 | 1115 | 2377 |
| 125 | 70 | 126 | 203 | 433 | 779 | 1258 | 2681 |
| 150 | 77 | 139 | 224 | 478 | 859 | 1388 | 2958 |
| 200 | 90 | 162 | 262 | 558 | 1004 | 1621 | 3455 |
Free Download Water Flow Conversion Table For Macbook Pro
Water Flow Capacity in Steel Pipes (sch 40)
| Pipe Size | Maximum Flow (gal/min) | Velocity (ft/s) | Head Loss (ft/100 ft) |
| 2' | 45 | 4.3 | 3.9 |
| 2-1/2' | 75 | 5.0 | 4.1 |
| 3' | 130 | 5.6 | 3.9 |
| 4' | 260 | 6.6 | 4.0 |
| 6' | 800 | 8.9 | 4.0 |
| 8' | 1,600 | 10.3 | 3.8 |
| 10' | 3,000 | 12.2 | 4.0 |
| 12' | 4,700 | 13.4 | 4.0 |
| 14' | 6,000 | 14.2 | 4.0 |
| 16' | 8,000 | 14.5 | 3.5 |
| 18' | 10,000 | 14.3 | 3.0 |
| 20' | 12,000 | 13.8 | 2.4 |
| 24' | 18,000 | 14.4 | 2.1 |
| Quantity | Reference Unit | is equal to | Conversion Factor | Unit | | 1 | gallon/day | = | 1 | gallon/day | | 1 | = | 0.041666666666667 | gallon/hour | | 1 | = | 0.00069444444444444 | gallon/minute | | 1 | = | 1.1574074074074E-5 | gallon/second | | 1 | = | 0.832674133 | gallon (UK)/day | | 1 | = | 0.034694755541667 | gallon (UK)/hour | | 1 | = | 0.00057824592569444 | gallon (UK)/minute | | 1 | = | 9.6374320949074E-6 | gallon (UK)/second | | 1 | = | 0.023809523809524 | barrel (oil)/day | | 1 | = | 0.00099206349206349 | barrel (oil)/hour | | 1 | = | 1.6534391534392E-5 | barrel (oil)/minute | | 1 | = | 2.7557319223986E-7 | barrel (oil)/second | | 1 | = | 0.0011201379156144 | acre-foot/year | | 1 | = | 3.0688710016833E-6 | acre-foot/day | | 1 | = | 1.2786962507014E-7 | acre-foot/hour | | 1 | gallon/day | = | 0.00133680555555 | hundred-cubic foot/day | | 1 | = | 5.570023148125E-5 | hundred-cubic foot/hour | | 1 | = | 9.2833719135417E-7 | hundred-cubic foot/minute | | 1 | = | 5.3333333333333 | ounce/hour | | 1 | = | 0.088888888888889 | ounce/minute | | 1 | = | 0.0014814814814815 | ounce/second | | 1 | = | 5.5511608866667 | ounce (UK)/hour | | 1 | = | 0.092519348111111 | ounce (UK)/minute | | 1 | = | 0.0015419891351852 | ounce (UK)/second | | 1 | = | 3.785411784 | liter/day | | 1 | = | 0.157725491 | liter/hour | | 1 | = | 0.0026287581833333 | liter/minute | | 1 | = | 4.3812636388889E-5 | liter/second | | 1 | = | 3785.411784 | milliliter/day | | 1 | = | 157.725491 | milliliter/hour | | 1 | gallon/day | = | 2.6287581833333 | milliliter/minute | | 1 | = | 0.043812636388889 | milliliter/second | | 1 | = | 0.003785411784 | cubic meter/day | | 1 | = | 0.000157725491 | cubic meter/hour | | 1 | = | 2.6287581833333E-6 | cubic meter/minute | | 1 | = | 4.3812636388889E-8 | cubic meter/second | | 1 | = | 3785.411784 | cubic centimeter/day | | 1 | = | 157.725491 | cubic centimeter/hour | | 1 | = | 2.6287581833333 | cubic centimeter/minute | | 1 | = | 0.043812636388889 | cubic centimeter/second | | 1 | = | 0.000206297153625 | cubic yard/hour | | 1 | = | 3.43828589375E-6 | cubic yard/minute | | 1 | = | 5.7304764895833E-8 | cubic yard/second | | 1 | = | 0.005570023147875 | cubic foot/hour | | 1 | = | 9.283371913125E-5 | cubic foot/minute | | 1 | gallon/day | = | 1.5472286521875E-6 | cubic foot/second | | 1 | = | 9.624999999528 | cubic inch/hour | | 1 | = | 0.1604166666588 | cubic inch/minute | | 1 | = | 0.00267361111098 | cubic inch/second | | 1 | = | 7.1412037043173E-5 | pound/second (Gasoline at 15.5°C) | | 1 | = | 0.004284722222267 | pound/minute (Gasoline at 15.5°C) | | 1 | = | 0.25708333324872 | pound/hour (Gasoline at 15.5°C) | | 1 | = | 6.1700000001483 | pound/day (Gasoline at 15.5°C) | | 1 | = | 3.2391955121282E-5 | kilogram/second (Gasoline at 15.5°C) | | 1 | = | 0.0019435173076095 | kilogram/minute (Gasoline at 15.5°C) | | 1 | = | 0.1166110384446 | kilogram/hour (Gasoline at 15.5°C) | | 1 | = | 2.7986649228428 | kilogram/day (Gasoline at 15.5°C) |
|
| Quantity | Unit | is equal to | Conversion Factor | Reference Unit | | 1 | gallon/day | = | 1 | gallon/day | | 1 | gallon/hour | = | 24 | | 1 | gallon/minute | = | 1440 | | 1 | gallon/second | = | 86400 | | 1 | gallon (UK)/day | = | 1.2009499999684 | | 1 | gallon (UK)/hour | = | 28.82279999924 | | 1 | gallon (UK)/minute | = | 1729.3679999544 | | 1 | gallon (UK)/second | = | 103762.07999727 | | 1 | barrel (oil)/day | = | 42 | | 1 | barrel (oil)/hour | = | 1008 | | 1 | barrel (oil)/minute | = | 60480 | | 1 | barrel (oil)/second | = | 3628800 | | 1 | acre-foot/year | = | 892.74721091061 | | 1 | acre-foot/day | = | 325852.73198237 | | 1 | acre-foot/hour | = | 7820465.567577 | | 1 | hundred-cubic foot/day | = | 748.05194805506 | gallon/day | | 1 | hundred-cubic foot/hour | = | 17953.246753321 | | 1 | hundred-cubic foot/minute | = | 1077194.8051993 | | 1 | ounce/hour | = | 0.1875 | | 1 | ounce/minute | = | 11.25 | | 1 | ounce/second | = | 675 | | 1 | ounce (UK)/hour | = | 0.18014249999525 | | 1 | ounce (UK)/minute | = | 10.808549999715 | | 1 | ounce (UK)/second | = | 648.51299998291 | | 1 | liter/day | = | 0.26417205235815 | | 1 | liter/hour | = | 6.3401292565956 | | 1 | liter/minute | = | 380.40775539573 | | 1 | liter/second | = | 22824.465323744 | | 1 | milliliter/day | = | 0.00026417205235815 | | 1 | milliliter/hour | = | 0.0063401292565956 | | 1 | milliliter/minute | = | 0.38040775539573 | gallon/day | | 1 | milliliter/second | = | 22.824465323744 | | 1 | cubic meter/day | = | 264.17205235815 | | 1 | cubic meter/hour | = | 6340.1292565956 | | 1 | cubic meter/minute | = | 380407.75539573 | | 1 | cubic meter/second | = | 22824465.323744 | | 1 | cubic centimeter/day | = | 0.00026417205235815 | | 1 | cubic centimeter/hour | = | 0.0063401292565956 | | 1 | cubic centimeter/minute | = | 0.38040775539573 | | 1 | cubic centimeter/second | = | 22.824465323744 | | 1 | cubic yard/hour | = | 4847.3766236143 | | 1 | cubic yard/minute | = | 290842.59741686 | | 1 | cubic yard/second | = | 17450555.845012 | | 1 | cubic foot/hour | = | 179.53246754127 | | 1 | cubic foot/minute | = | 10771.948052476 | | 1 | cubic foot/second | = | 646316.88314858 | gallon/day | | 1 | cubic inch/hour | = | 0.1038961039012 | | 1 | cubic inch/minute | = | 6.2337662340719 | | 1 | cubic inch/second | = | 374.02597404432 | | 1 | pound/second (Gasoline at 15.5°C) | = | 14003.241489883 | | 1 | pound/minute (Gasoline at 15.5°C) | = | 233.38735818232 | | 1 | pound/hour (Gasoline at 15.5°C) | = | 3.8897893043596 | | 1 | pound/day (Gasoline at 15.5°C) | = | 0.16207455429108 | | 1 | kilogram/second (Gasoline at 15.5°C) | = | 30871.862975106 | | 1 | kilogram/minute (Gasoline at 15.5°C) | = | 514.53104949704 | | 1 | kilogram/hour (Gasoline at 15.5°C) | = | 8.575517492498 | | 1 | kilogram/day (Gasoline at 15.5°C) | = | 0.35731322883207 |
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Water Flow Conversion Table
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