T75F Elevated Pond and Stream Sizing

Follow steps 1 → 4

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) × 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 (both must be greater than 0).

Calculated Waterfall Flow — GPM

✔ Waterfall Flow (Window A) — GPM

Stream Channel Dimensions

Windows B · C · D · E · F

B — Waterfall Weir Rock Thickness

Enter the thickness of the weir rock (inches)

inches

C — Total Water Depth in Stream Channel

Auto-calculated: Water depth over falls (A) + Rock thickness ÷ 1.714 (B ÷ 1.714)

Combined Depth (A + B ÷ 1.714) — inches

D — Stream Channel Width

Width of excavated channel before liner (feet)

E — Stream Length

Total length of the stream (feet)

F — Total Gallons in Stream

Auto-calculated: C × D × E (converted to gallons)

Stream Volume — gallons

Pond Surface Skimming Calculator

Windows G · H — Pond surface area, circulation & total skimming flow

💧 Pond Surface Skimming Details

Because the filter tank rim is lower than the pond rim, the pond skimming depth volume must be contained in the Filtrific reservoir when the system is turned off. Enter the pond surface area to calculate the skimming depth and the gallons that must be contained.

G — Pond Surface Area

Total surface area of the pond (square feet)

sq ft

H — Circulation (Auto-Calculated)

Circulation = 0.15 × Pond Surface Area

Total Skimming Flow including Waterfall and Circulation (Auto-Calculated)

Waterfall GPM + Circulation GPM · S64 for flows up to 80 GPM · S66 for flows 81 – 200 GPM

Containment Results

Windows I · J — Net containment and recommended product configuration

I — Total Containment Required — gallons

Breakdown

Stream volume (F) —

Pond skimming depth gallons —

Total containment required —

J — Product Configuration

Including pond skimming depth gallons

—

Stream volume only (excluding pond skimming gallons)

—

Additional Recommended Products

Based on Waterfall Flow (Window A) GPM

Also Recommended

WS1 — Waterfall Starter

PS1 — Pump Shut-Off

K5 — Auto-Fill Assembly