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Culvert Hydraulics (Inlet vs Outlet Control FHWA HDS-5) Calculator

Easily calculate and compute culvert hydraulics (inlet vs outlet control fhwa hds-5) calculator with accurate equations, live formulas, and expert guidance.

Circular culvert interior diameter.

Water level above culvert inlet invert.

Total pipe length.

Invert slope.

Calculated Result
3.4 m³/s

Governing Capacity

Governing Capacity

3.4 m³/s

Governing Discharge Capacity Q

3.4

Inlet Control Discharge Q

3.4

Outlet Control Discharge Q

5.32

Headwater To Diameter Ratio Hw Over D

1.5

3.4 — m³/s

Calculation Breakdown

  1. Applied FormulaSizes storm culvert hydraulic discharge capacity comparing inlet control against barrel friction outlet control per FHWA HDS-5 methodology.Q_{inlet} = C_d A \sqrt{2g(HW - 0.5D)}, \quad H_{outlet} = \left(1 + K_e + \frac{29.16 n^2 L}{D^{4/3}}\right)\frac{V^2}{2g}

Culvert Inlet & Outlet Control Metric Output

Interactive visualization based on your current inputs

Calculated Value
0.00.81.72.53.4Governing Capacity

What Is the Culvert Hydraulics (Inlet vs Outlet Control FHWA HDS-5) Calculator?

This tool computes culvert hydraulics (inlet vs outlet control fhwa hds-5) calculator with high precision arithmetic.

How Does the Culvert Hydraulics (Inlet vs Outlet Control FHWA HDS-5) Calculator Work?

Sizes storm culvert hydraulic discharge capacity comparing inlet control against barrel friction outlet control per FHWA HDS-5 methodology.

Culvert Hydraulics (Inlet vs Outlet Control FHWA HDS-5) Calculator Formula & Variables

The core mathematical equation utilized by this calculator is expressed as:

Qinlet=CdA2g(HW−0.5D),Houtlet=(1+Ke+29.16n2LD4/3)V22gQ_{inlet} = C_d A \sqrt{2g(HW - 0.5D)}, \quad H_{outlet} = \left(1 + K_e + \frac{29.16 n^2 L}{D^{4/3}}\right)\frac{V^2}{2g}

Sizes storm culvert hydraulic discharge capacity comparing inlet control against barrel friction outlet control per FHWA HDS-5 methodology.

How to Use the Culvert Hydraulics (Inlet vs Outlet Control FHWA HDS-5) Calculator

  1. Enter your parameters into the designated input fields to calculate the result immediately.

Step-by-Step Example Calculation

Culvert Hydraulics (Inlet vs Outlet Control FHWA HDS-5) Calculator Example

Input Values:

culletDiameterMetersD:1.2
headwaterDepthAboveInvertHw:1.8
culvertLengthMeters:25.0
culvertSlopeS0:0.01
Worked Steps: Sample evaluation based on standard reference conditions.

Understanding Your Result

The calculated primary figure indicates the optimal or required m³/s.

Factors That Affect the Result

  • Measurement tolerances, operational variance, and real-world conditions.

When Should You Use This Calculator?

  • Everyday budgeting, technical homework, professional estimation, and household projects.

Assumptions & Limitations

  • Assumes standard atmospheric or environmental parameters unless specified.

Frequently Asked Questions

Calculation Accuracy & Reference Note

Double-precision IEEE 754 arithmetic with validated empirical constants.

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