# Hazen-Williams Equation Calculator

## Results:

### Introduction to Hazen-Williams Equation

The Hazen-Williams equation is a widely acknowledged formula used in the field of hydraulic engineering, especially for calculating flow velocity and discharge in water supply systems. Developed by Allen Hazen and Gardner Stewart Williams in the early 20th century, this empirical formula has become a standard tool in the analysis of water flow in pipes.

### Core Purpose of the Equation

The primary purpose of the Hazen-Williams equation is to estimate the velocity of water in a full-flowing pipeline. This calculation is crucial for designing water distribution systems, ensuring the pipes are adequately sized to meet the required flow rates without causing excessive pressure loss.

### Formula and Parameters

Q = 0.278 C A D2.63 J0.54
• Q = Flow rate (cubic meters per second, m³/s)
• C = Hazen-Williams roughness coefficient
• A = Cross-sectional area of the pipe (square meters, m²)
• D = Diameter of the pipe (meters, m)
• J = Hydraulic gradient (dimensionless)