1. What is a Well Flow Rate Calculator?

Definition: This calculator estimates the flow rate of a well pump in gallons per minute (GPM) based on pump horsepower, efficiency, and total dynamic head.

Purpose: It helps well professionals and property owners determine the expected water output of their well pump system.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Flow rate (gallons per minute)
• \( HP \) — Pump horsepower
• \( \eta \) — Pump efficiency (0-1)
• \( H \) — Total dynamic head (feet)

Explanation: The formula converts mechanical power to hydraulic power, accounting for pump efficiency and the work needed to lift water.

3. Importance of Flow Rate Calculation

Details: Proper flow rate estimation ensures adequate water supply, proper pump sizing, and efficient system operation.

4. Using the Calculator

Tips: Enter the pump horsepower, efficiency (default 0.85 for 85%), and total dynamic head in feet. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is total dynamic head?
A: It's the total equivalent height the pump must lift water, including vertical lift and friction losses in pipes.

Q2: What's a typical pump efficiency?
A: Most submersible pumps have 70-85% efficiency (0.7-0.85), while jet pumps are typically 50-70% efficient.

Q3: Why is 3960 in the formula?
A: This is a conversion constant that relates horsepower to foot-pounds per minute (1 HP = 3960 ft-lb/min).

Q4: What's the 8.34 factor?
A: This represents the weight of one gallon of water in pounds (at 60°F).

Q5: How accurate is this calculation?
A: It provides a theoretical maximum. Actual flow may be less due to system restrictions or pump wear.