Source Documents
These are the council documents used to build the QLDC calculator. If a link is broken, the document may have moved on the council website.
Calculation Methodology
Design event: 10-year (10% AEP)
Method: 2025 Code of Practice
Updated stormwater section with revised soakage design and blockage factors. Based on NZS 4404:2010. Site-specific design required for all developments.
Design Requirements
- 2025 Code of Practice compliance
- NZS 4404:2010 base standard
- Updated soakage design requirements
- Revised blockage factors
Submission
Required Documents
- Stormwater design per CoP 2025
- Engineering plans
- Resource consent
Contact
Last verified: April 2026 · NZ Detention Tank Calculator