# Hydraulic Gradient Equation

**Formula:**`i = (h1 - h2) / L`

## Introduction to Hydraulic Gradient Equation

The hydraulic gradient equation is used to calculate the slope of a hydraulic head over a defined distance. In this formula, ** i** represents the hydraulic gradient,

**and**

*h1***are the respective elevation heads at each end of the distance, and**

*h2***represents the distance along the flow path. The result is generally expressed in meters per meter (m/m) or other length by length units.**

*L*## Parameter Usage:

`h1`

= elevation head at one end`h2`

= elevation head at the other end`L`

= distance along the flow path

## Output:

`i`

= hydraulic gradient

## Data Validation

The elevation heads and distance should be non-negative numbers. Additionally, the distance should not be zero.

## Summary

This calculator takes into account the elevation heads at both ends of a flow path and the distance between them to calculate the hydraulic gradient, which is a measure of the slope of the hydraulic head.

Tags: Hydraulics, Gradient, Elevation, Head