Hydraulics Calculators
Calculate pipe flow, analyze open channels, and design drainage conveyance systems using Manning's equation and hydraulic principles.
About Hydraulic Analysis
Hydraulic calculators help you understand how water flows through pipes, channels, and drainage systems. These tools are essential for sizing conveyance infrastructure, ensuring adequate capacity, and preventing flooding.
Use these calculators to:
- Calculate pipe flow capacity and velocity using Manning's equation
- Determine normal depth and critical depth for open channels
- Analyze flow regimes and classify flow as subcritical or supercritical
- Design channel sections for maximum hydraulic efficiency
- Calculate head losses at channel transitions and inlet structures
- Size gutters, downspouts, and roadway drainage systems
Pipe Flow
Calculate flow capacity and velocity in closed conduits
Open Channel Flow
Analyze flow in natural and constructed channels
Manning's Channel Flow
Calculate open channel flow capacity for trapezoidal, rectangular, and triangular sections
Critical Depth
Calculate critical depth for rectangular, trapezoidal, and circular channels
Normal Depth
Calculate normal depth for uniform flow using Manning's equation
Froude Number
Classify flow regime as subcritical, critical, or supercritical
Gradually Varied Flow
Calculate water surface profiles using Standard Step Method
Weir Calculator
Calculate discharge or head for regular, V-notch, and irregular weirs
Channel Design
Design and optimize channel cross-sections
Best Hydraulic Section
Optimize channel dimensions for maximum hydraulic efficiency
Compound Channel
Analyze channels with overbank flow and floodplains
Channel Transitions
Calculate head losses and water surface changes at transitions
Channel Protection
Design erosion protection and channel linings
Channel Lining Design
Design flexible and rigid channel linings for erosion protection
Riprap Sizing
Calculate D50 stone size for channel and outlet protection
Rock/Sediment Gradation Calculator
Analyze pebble counts, particle-size percentiles, and riprap gradation limits
Roadway Drainage
Calculate gutter flow and roadway hydraulics
Gutter Flow
Calculate gutter capacity, spread width, and flow velocity
Roadway Gutter Calculator
Analyze uniform and composite roadway gutter sections and spread
Median/Ditch Drop-Inlet Calculator
Analyze median and roadside ditch drop inlets on grade or in sag
Horizontal Grade Inlet Calculator
Size inlet perimeter and spacing for zero- and near-zero-grade pavements
Learning Resources
Understand the theory behind the calculations
Understanding Manning's Equation
How to apply V = (1.49/n) R^(2/3) S^(1/2)
Learn more: Understanding Manning's EquationOpen Channel Flow Basics
Uniform flow, critical depth, and flow classification
Learn more: Open Channel Flow BasicsManning's n Values Reference
Comprehensive table of roughness coefficients
Learn more: Manning's n Values ReferenceLooking for a different type of calculator?
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