Pond Sizing Calculator

Enter your waterfall flow and pond surface area to size your filtration and skimming system.

Waterfall Flow Calculator

Enter waterfall width and water depth to calculate GPM

Enter the waterfall width (L) and the water depth flowing over the falls (H) to calculate the waterfall GPM. Formula: Q = 3.33 × (L − 0.2H) × H^3/2

Waterfall Width (L)

Width of the waterfall opening

Water Depth Over Falls (H) Depth of water flowing over the weir, in inches

⚠️ Please enter valid values for L and H.

Calculated Waterfall Flow (A) — GPM

✓ Waterfall GPM (A) — GPM

Please calculate waterfall GPM first.

Customer enters total pond surface area in square feet

B Pond Surface (sq ft)

Rate: 0.15 GPM per sq ft of pond surface
Circulation GPM = 0.15 × Pond sq ft

Please enter a valid pond surface area.

Circulation, total waterflow, and recommended filter tank

Based on filter tank selection and total waterflow (D)

Complete Step 3 to see skimmer recommendations.

Complete Step 3 above to see the recommended products for your pond configuration.