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Rainwater tank calculator

Use the form below to calculate how much water a rainwater tank could save your business.

The calculator will also help you select the most suitable sized tank for your needs.

* Denotes a mandatory field

Site information

1. Postcode *:
2. Roof area that will be connected to the rainwater tank *:
m2

3. What size rainwater tank are you planning to install? *:
Litres

Where will rainwater be used?

Complete sections 1 to 4 to describe where you will use rainwater in your business.
Leave a section blank if you do not intend to supply rainwater to that area.
1. Toilet

How many employees:

Number of operating days per year:

Estimated water used for toilets:
kL / day

2. Irrigation

Flow rate:
L / min

Hours/week

Estimated water used for irrigation:
kL / day

Sections 3 and 4 allow you to enter information about other water using process in your business. Use section 3 for processes with a fixed water use. Use section 4 when the water use varies over the year (eg cooling towers)
3. Other water use (fixed)

Item demand:
kL / day

4. Other water use (variable)

Jan:
kL/day         July:   kL/day
Feb:
kL/day         Aug:   kL/day
Mar:
kL/day         Sep:   kL/day
Apr:
kL/day         Oct:    kL/day
May:
kL/day         Nov:    kL/day
Jun:
kL/day         Dec:    kL/day
  This calculation may take time. Please be patient.

This Online Rainwater Tank Calculator is provided for use as a guide only and actual water savings will vary from business to business.

To the extent permitted by law, by you using this calculator you accept full responsibility for any outcome arising from that use and agree to indemnify Sydney Water against any reliance, claim, damage or loss arising from the use of the calculator or information obtained or derived from that use.