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💧Filtrific®
T390F Pond and Stream Sizing
Follow steps 1 → 41
Waterfall Flow Calculator
Calculate GPM and capture water depth over the falls
📐 Rectangular Contracted Weir Calculator
Enter the waterfall width (L) and the depth of water flowing over the falls (H). Formula: Q = 3.33 × (L − 0.2H) × H3/2
Depth of water flowing over the weir, in inches
⚠️ Please enter valid values for L and H (both must be greater than 0).
Calculated Waterfall Flow
—
GPM
✔ Waterfall Flow (Window A)
—
GPM
2
Stream Channel Dimensions
Windows B · C · D · E · F
Enter the thickness of the weir rock (inches)
inches
Auto-calculated: Water depth over falls (A) + Rock thickness ÷ 1.714 (B ÷ 1.714)
Combined Depth (A + B ÷ 1.714)
—
inches
Width of excavated channel before liner (feet)
ft
Total length of the stream (feet)
ft
Auto-calculated: C × D × E (converted to gallons)
Stream Volume
—
gallons
3
Pond Reservoir Calculator
Windows G · H — Pond surface area, circulation & total skimming flow
💧 Pond Reservoir Details
The pond can serve as a reservoir during startup. Based on a maximum of 3" available water height above the skimmer, the pond contributes gallons that offset the total containment required.
Total surface area of the pond (square feet)
sq ft
Circulation = 0.15 × Pond Surface Area
Waterfall GPM + Circulation GPM · S64 for flows up to 80 GPM · S66 for flows 81 – 200 GPM
4
Containment Results
Windows I · J — Net containment and recommended product configuration
I — Net Containment Required
—
gallons
Breakdown
Stream volume (F)
—
Pond reservoir credit
—
Net containment required
—
J — Product Configuration
With the pond reservoir credit
—
Without the pond reservoir credit
—
+
Additional Recommended Products
Based on Waterfall Flow (Window A) GPM
Also Recommended
WS1 — Waterfall Starter
PS1 — Pump Shut-Off
K5 — Auto-Fill Assembly