1. What is Pump Flow Rate?

The pump flow rate is the volume of water that a pump can move per unit of time. It's a critical parameter for selecting the right pump size for ponds, pools, and water circulation systems.

2. How Does the Calculator Work?

The calculator uses the pump flow rate formula:

Where:

• \( \text{Pump Flow Rate} \) — Flow rate in gallons per hour (GPH)
• \( \text{Pond Volume} \) — Total volume of the pond in gallons
• \( \text{Turnover Time} \) — Desired time to circulate entire pond volume in hours

Explanation: This calculation ensures your pump can circulate the entire pond volume within your desired timeframe, maintaining proper water quality and filtration.

3. Importance of Proper Pump Sizing

Details: Correct pump sizing is essential for efficient water circulation, proper filtration, adequate oxygenation, and preventing stagnation. An undersized pump won't provide sufficient turnover, while an oversized pump wastes energy and may cause excessive turbulence.

4. Using the Calculator

Tips: Enter pond volume in gallons and desired turnover time in hours. Typical turnover rates range from 1-4 hours for koi ponds and 4-6 hours for garden ponds. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a good turnover time for a pond?
A: For koi ponds: 1-2 hours turnover; for garden ponds: 2-4 hours; for heavily stocked ponds: 1 hour or less.

Q2: How do I calculate pond volume?
A: For rectangular ponds: Length × Width × Depth × 7.48; for circular ponds: π × Radius² × Depth × 7.48 (all measurements in feet).

Q3: Should I consider head height when selecting a pump?
A: Yes, pump performance decreases with elevation. Always check the pump's flow rate at your specific head height requirements.

Q4: What's the difference between GPH and GPM?
A: GPH = gallons per hour, GPM = gallons per minute. 1 GPM = 60 GPH. Most pond pumps are rated in GPH.

Q5: Do I need to account for pipe friction loss?
A: Yes, longer pipe runs, elbows, and fittings create friction that reduces flow rate. Add 10-20% to your calculated flow rate to compensate.