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Sump Pit Flow Rates Table
To Estimate Your Required Backup Sump Pump Size

To determine the optimum backup sump pump size for Your basement, we need to estimate the maximum water flow into Your sump pit:

How Can I Measure My Sump Pit Flow Rate Accurately?

To accurately determine Your sump pit flow rate you will need a tape measure and a watch that indicates seconds:

  • Measure the diameter of Your sump pit and note it down.
  • At a time of high water flow (when Your primary sump pump is cycling regularly), allow Your sump pump to drain Your sump pit to a level just above the top of the pump, and then turn off the pump.
  • Extend Your tape measure in your sump pit and lock it off with the "0 inch" end of the tape touching the water surface.
  • Observe the water level and note the amount of tape measure scale covered by water after exactly 60 seconds.
  • Make Sure You Turn Your Primary Sump Pump Back On!
  • Repeat 3 times at different times of high flow, and use the longest distance covered (highest water flow rate) to find Your maximum sump pit flow rate in gallons per hour (gph) by using the table below.
  • Use this information to click the most appropriate button in the yellow box above.

    • Sump Pit Water Flow Rates (gph)

    Inches Of Water Rise In 60 Seconds

    Sump Pit Diameter

    4 in

    8 in

    12 in

    16 in

    20 in

    24 in

    28 in

    32 in

    36 in

    16 in

    209

    418

    627

    836

    1,044

    1,253

    1,462

    1,671

    1,880

    18 in

    264

    529

    793

    1,058

    1,322

    1,586

    1,851

    2,115

    2,379

    20 in

    326

    653

    979

    1,306

    1,632

    1,958

    2,285

    2,611

    2,938

    22 in

    395

    790

    1,185

    1,580

    1,975

    2,370

    2,765

    3,160

    3,554

    24 in

    470

    940

    1,410

    1,880

    2,350

    2,820

    3,290

    3,760

    4,230

    Sump Flow Range:

    Residential

    Commercial

    Industrial

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