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Cover Water Volume & Pump Runtime Calculator

Estimate water sitting on the cover and how long your pump will need to remove it.

For a rectangle, multiply length by width. A 16 × 32 cover is approximately 512 square feet.
Estimate the average depth across the area where water has collected.
Use the rating on the pump label or packaging. Actual flow may be lower.
Estimated pump time:
Safety: Do not allow the pump to run dry. Use a GFCI-protected outlet and keep cords and electrical connections out of standing water.

How the Cover Pump Planner Works

This calculator estimates the amount of water sitting on a solid pool cover from the cover’s surface area and average water depth. It then divides that volume by the pump’s adjusted flow rate to estimate how long removal may take.

The efficiency setting lowers the advertised pump flow to account for hose length, lift height, debris, voltage conditions, and other real-world restrictions.

Why Water on a Pool Cover Matters

Standing water adds significant weight to a cover. It can stretch the material, pull on anchors, create deep low spots, and make the cover harder to remove. Leaves and debris can also clog the pump or trap more water.

Keeping water under control helps protect the cover and makes spring opening safer and easier.

What Changes Pump Runtime

  • Pump flow rating and actual operating flow.
  • Vertical lift from the cover to the discharge point.
  • Hose diameter, length, kinks, and restrictions.
  • Debris around the pump intake.
  • Whether the pump sits at the true low point.

Common Cover-Pumping Mistakes

  • Using peak pump flow as the real flow rate.
  • Letting the pump run dry after the water level falls.
  • Placing the pump away from the lowest area.
  • Discharging water where it can flow back toward the pool.
  • Using damaged cords or unprotected electrical connections.

Frequently Asked Questions

How do I estimate average water depth?

Measure several areas and use a reasonable average. A deep center pocket with dry edges should not be treated as if the entire cover has the maximum depth.

Why is actual runtime longer than the estimate?

Advertised flow is usually measured under favorable conditions. Lift height, long hoses, debris, and voltage drop can reduce real output.

Can I leave an automatic cover pump unattended?

Only when the pump is designed for automatic use, installed correctly, and connected safely. Check the cover and discharge path regularly.

Where should the discharge hose go?

Route it to a legal drainage area away from the pool, foundation, and places where water could freeze or create erosion.

Pool Gal Pro Tip 💦

Move the pump to the lowest pocket before assuming it is too small. A great pump sitting on a high spot still leaves a small pond behind.