Search Ctrl K
Home / Tools
THE FEUTEX TOOLKIT

Tank Orifice Drain Time

Estimate time to drain between two liquid levels and initial discharge.

Hydraulics workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
FormulaIntegrate A dh/dt=−Cd a√(2gh).
Sources and model references

Worked example

Inputs

Constant tank plan area
1 m²
Orifice area
0.001 m²
Discharge coefficient
0.62
Initial head above opening
2 m
Final head above opening
0.5 m

Expected results

Drain duration
515.0483174 s
Initial discharge
0.00388313083 m³/s

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter every input in the labeled units; use measured or independently specified properties.
  2. Check the stated model assumptions before calculating.
  3. Interpret the output as a model estimate and verify it independently for the intended application.

Try this example

{
  "tank": 1,
  "hole": 0.001,
  "cd": 0.62,
  "initial": 2,
  "final": 0.5
}

Accuracy and scope

Vented constant-area reservoir, small opening, constant coefficient and no inflow. Educational engineering estimate only; not structural or safety certification, equipment selection, or operating recommendations.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.