Source Documents
These are the council documents used to build the GDC calculator. If a link is broken, the document may have moved on the council website.
Calculation Methodology
Design event: 10-year (10% AEP)
Method: Site-Specific Design
Gisborne is a unitary authority. The piped system is designed for the 10-year storm event. Site-specific assessment is required via resource consent.
Design Requirements
- 10% AEP (10-year) piped system design
- Site-specific assessment via resource consent
Submission
Required Documents
- Stormwater design report
- Engineering plans
- Resource consent
Contact
Last verified: April 2026 · NZ Detention Tank Calculator