Turnover-based flow
Converts pond capacity and turnover interval into base GPH.
Enter pond capacity, desired turnover time, vertical lift, estimated pipe and fitting head loss, and a flow reserve to identify the required pump-curve operating point.
Base flow = pond gallons / turnover hours. Required flow = base flow x (1 + reserve). Total dynamic head = vertical head + estimated pipe and fitting head loss.
Converts pond capacity and turnover interval into base GPH.
Combines vertical lift with estimated pipe and component loss.
States the flow that must be delivered at the calculated head.
Turnover flow divides pond volume by the number of hours allowed for one nominal circulation. The calculator adds a flow reserve, but the displayed requirement must be met at total dynamic head, not at zero head. Add the vertical elevation from operating water level to discharge and the estimated equivalent head from pipe, fittings, valves, filters, and other components.
Pump labels often advertise maximum flow at little or no head and maximum head at nearly zero flow. Neither value alone identifies the operating point. Use the manufacturer performance curve and select a pump that delivers the calculated GPH where the curve crosses the estimated total dynamic head.
Waterfalls and streams may need additional flow based on spillway width and desired appearance. Filtration, fish load, suction safety, solids handling, pipe velocity, electrical protection, dry-run protection, noise, energy use, and winter operation also affect selection. Confirm requirements with equipment manufacturers and qualified installers.
| Input | What it means | Planning note |
|---|---|---|
| Pond volume | Operating water capacity in gallons | Use measured fill volume where possible. |
| Turnover time | Hours per nominal pond circulation | Requirements vary by feature and filtration system. |
| Vertical head | Elevation from source water level to discharge | Measure the vertical difference, not pipe length. |
| Pipe head loss | Equivalent feet from pipe, fittings, and equipment | Calculate from actual flow and system components. |
Estimate a turnover-based pump operating target.
Establish baseline flow before adding spillway appearance demand.
Compare manufacturer curves at the same total dynamic head.
Maximum GPH is usually rated near zero head; actual flow declines as total dynamic head increases.
No. Vertical head is elevation difference, while pipe length contributes friction loss calculated separately.
No. Waterfall appearance also depends on spillway width, depth, shape, and additional flow demand.
Yes. Include filters, UV units, valves, fittings, and other components in the head-loss estimate.
Last reviewed: September 4, 2026. Verify actual dimensions, operating flow, pump curves, total dynamic head, electrical requirements, local codes, and water quality needs before installation.
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