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← All toolsTOOL-009 · Gate 5 Draft / Closed

Hydraulic Grade / Energy Grade Helper

Compare hydraulic grade and energy grade between two supplied sections with a Bernoulli energy balance.

Closed draft. This helper compares supplied section values; it does not solve a network HGL profile or surcharge.
01

Section inputs

Supply elevations, pressure heads, velocities and total loss.

Scenario
Upstream section
Downstream section
Energy loss
02

Grade-line result

Enter two sections and calculate.

H

Ready for an energy check

HGL is elevation plus pressure head. EGL adds velocity head.

Methodology

Hydraulic grade and energy grade comparison

TOOL-009 computes HGL = z + p/γ and EGL = HGL + V²/(2g) at two supplied sections in canonical SI units.

Energy balance

The upstream energy grade is reduced by the supplied total head loss and compared with the downstream energy grade. The residual is reported as balanced within 1e-6 m, energy surplus or energy deficit.

Worked example

For upstream z = 100 m, pressure head = 8 m and velocity = 2 m/s, downstream z = 98 m, pressure head = 8.1 m and velocity = 2.2 m/s, with 0.3 m supplied loss, the helper reports the two HGL/EGL values and the energy balance residual.

Limitations

This closed draft compares user supplied sections. It does not solve a network HGL profile, surcharge, pipe sizing, pump or turbine work, minor-loss schedule, unsteady flow or code compliance.

Source

SRC-BERNOULLI-GRADE-LINES-TOOL009-001