How to Calculate Gravity Fed Water Pressure

Water Pressure Formula:

\[ P = \rho \times g \times h \]

Water Pressure (Pascals):

1. What is Gravity Fed Water Pressure?

Definition: This calculator estimates the water pressure at the bottom of a column of water due to gravity.

Purpose: It helps engineers, plumbers, and DIYers determine water pressure in systems like water towers, tanks, and plumbing systems.

2. How Does the Calculator Work?

The calculator uses the hydrostatic pressure formula:

\[ P = \rho \times g \times h \]

Where:

\( P \) — Water pressure (Pascals, Pa)
\( \rho \) — Density of water (kg/m³, typically 1000 for pure water)
\( g \) — Acceleration due to gravity (m/s², typically 9.81 on Earth)
\( h \) — Height of water column (meters)

Explanation: The pressure increases with depth due to the weight of the water above.

3. Importance of Water Pressure Calculation

Details: Proper pressure estimation ensures correct pipe sizing, pump selection, and system design for water supply systems.

4. Using the Calculator

Tips: Enter water density (default 1000 kg/m³), water height in meters, and gravity (default 9.81 m/s²). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the typical water density?
A: Pure water at 4°C has a density of 1000 kg/m³. Saltwater is about 1025 kg/m³.

Q2: How does temperature affect the calculation?
A: Warmer water is less dense. For precise calculations, adjust density for temperature.

Q3: Can I use this for other liquids?
A: Yes, but you must use the correct density for the specific liquid.

Q4: How do I convert Pascals to other units?
A: 1 psi ≈ 6895 Pa, 1 bar = 100,000 Pa, 1 atm ≈ 101,325 Pa.

Q5: Does this include atmospheric pressure?
A: No, this calculates only the pressure from the water column. Total pressure would add atmospheric pressure (101,325 Pa at sea level).