Sewage calculation: slope and flow rate (Excel)

Sewage calculation: slope and flow rate (Excel)

The correct sewage slope is the key to avoiding clogs. Calculate it in a minute.

You are a professional or a DIY enthusiast. You know: if the slope is too small, the pipe silt deposits. If it’s too steep — water flows away quickly, leaving waste behind, which leads to noise. Accurate calculation is essential.

This calculator solves the problem. Input the length, diameter, and drop — get an assessment: whether the slope is sufficient and if the flow rate is optimal.

What it calculates:

- Standard slope — based on pipe diameter (3 cm/m for 50 mm pipes, 2 cm/m for 110 mm pipes, 0.8 cm/m for 160 mm pipes).

- Required drop — how many centimeters you’ll need for your chosen length.

- Actual slope — what you’ve achieved.

- Flow velocity — with a rating of "optimal," "too slow," or "too fast."

- Overall verdict — "All in order" or "Issues found."

Why it’s convenient:

- Checks slope — no need to memorize standards.

- Checks velocity — to prevent clogs and noise.

- Simple: enter data — get results.

- Secure: formulas are hidden, protecting the buyer from tampering.

Ideal for:

- Plumbers — to check slope accuracy.

- Professionals — for sewage installation.

- DIY enthusiasts — for their own projects.

Important note: Water consumption values can be taken from water supply calculations. Slope standards follow SP documentation.

Format: archive (Excel + Word). Works in Microsoft Excel and Google Sheets.