What Is the Open Channel Hydraulic Critical Depth & Specific Energy Calculator?
The Open Channel Hydraulic Critical Depth & Specific Energy Calculator evaluates flow regimes, specific energy curves, and critical transitions in open canals.
How Does the Open Channel Hydraulic Critical Depth & Specific Energy Calculator Work?
It computes unit discharge, critical depth, critical velocity, operating specific energy, and Froude number to classify the flow regime.
Open Channel Hydraulic Critical Depth & Specific Energy Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
Bakhmeteff specific energy formulation where critical flow minimizes total head for a given discharge.
How to Use the Open Channel Hydraulic Critical Depth & Specific Energy Calculator
- Enter total discharge in m³/s.
- Specify channel base width in meters.
- Input operating depth to evaluate current state.
Step-by-Step Example Calculation
15 m³/s Rectangular Irrigation Canal
Input Values:
Understanding Your Result
Critical Depth (y_c): Threshold water depth separating subcritical and supercritical states.
Minimum Specific Energy: Least energy needed to convey the discharge.
Froude Number: Dimensionless ratio classifying flow state (Fr < 1: subcritical; Fr > 1: supercritical).
Factors That Affect the Result
- Increasing discharge raises critical depth with power of 2/3.
- Constricting channel width increases unit discharge and elevates critical depth.
When Should You Use This Calculator?
- Spillway chutes, weir crest design, canal drops, culvert transitions, and hydraulic jump stilling basin sizing.
Assumptions & Limitations
- Assumes rectangular prismatic channel section and hydrostatic pressure distribution.
Frequently Asked Questions
Calculation Accuracy & Reference Note
Conforms to Chow Open-Channel Hydraulics and standard fluid dynamics principles.