Terms & Conditions

Cirtex® Stormwater Calculators Terms and Condition of use:

Intended use

The Cirtex RainSmart and Triton stormwater calculators (‘The calculators’) are intended to assist a qualified designer with selecting the appropriate size and layout of a stormwater system. The suggested layouts generated by the calculators are intended as a guide only and have not been prepared by taking into account the particular objectives, situation or needs of any individual users or projects. You must use appropriate judgement in applying the results to the specific project, and the results must be checked and approved by a suitably qualified stormwater engineer before construction.

The calculators are intended for use in the New Zealand environment only, and must not be used for projects located outside of New Zealand.

The calculators are for the sole use of the person who registered with Cirtex Industries Limited (‘Cirtex’) and to whom they were directly supplied by Cirtex. Every user of the calculators must be registered with Cirtex. Use of the calculators by anyone who has not registered with Cirtex is not authorised.


The calculators use only one of a number of recognised methods for calculating stormwater runoff. The designer has sole responsibility to ensure this method is suitable to the site being considered and any relevant statutory or contractual requirements. The calculators are a tool only and are not a substitute for professional judgement. Many factors on site and during construction will impact the final result of the project.

To the maximum extent permitted by law, Cirtex and their associated persons:

– do not warrant that the calculators will meet your requirements and do not provide any warranties of any kind, including as to fitness for a particular purpose, in respect of either the stormwater calculators or any finished stormwater management system;

– disclaim all liability, whether in contract, tort or otherwise, for any loss or damage of any kind arising directly or indirectly from your use of, or reliance upon, the calculators; and

– are not responsible for any consequence arising out of the use of these calculators, including any loss or damage arising from that use.

Stormwater design methodologies and practices and relevant codes and regulations may change over time. You acknowledge that Cirtex is under no obligation to update or re-issue the calculators to reflect any such changes or to inform you of any such changes.