Tēnā koe Joshua

Please find attached the Department of Internal Affairs response to your request for information.

Ngā mihi,

Water Services
Te Tari Taiwhenua Department of Internal Affairs
45 Pipitea Street | PO Box 805, Wellington 6140, New Zealand | http://www.dia.govt.nz/

-----Original Message-----
From: Joshua Riley <[FOI #34241 email]>
Sent: Wednesday, 25 March 2026 6:10 pm
To: OIA <[DIA request email]>
Subject: Official Information request - Underlying data for Hokianga Harbour in the "Vulnerable Communities Exposed to Flood Hazard" (Aug 2022) Report

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I request the following information under the Official Information Act 1982 (OIA):

My request relates to the report titled "Vulnerable Communities Exposed to Flood Hazard," dated August 2022 and proactively released by the DIA in October 2022. Specifically, I am seeking the underlying data, modeling, and communications used to establish the boundary and classification of the Hokianga Harbour / Hokianga Region as a vulnerable community exposed to flood hazard (as listed in Table 1 and Figure 1 of the report).

I am requesting the following specific information referenced in the report's methodology (Section 4):

1. NIWA Composite Data (Section 4.7): All specific surface-river flood hazard data and coastal flood hazard data (including the +1.2m sea level rise scenario) that NIWA provided to the DIA or its contractors for the Hokianga area.

2. Qualitative "Mural Board" Data (Section 4.8): Copies of the specific notes, comments, and mapping pins that Regional Council River Managers and Tonkin+Taylor flood practitioners placed on the online 'Mural Board' map regarding the Hokianga Harbour area.

3. GIS/Riskscape Outputs (Section 4.9 & 4.10): The ARCGIS map layers, shapefiles, or Riskscape outputs that show exactly how the hazard data was overlaid with the NZDep 2018 SA1 unit data to establish the specific geographic boundaries of the "vulnerable community" in Hokianga.

4. Historical Validation (Section 4.11): Any specific records from the Historical Weather Events Catalogue (NIWA) or Radio New Zealand archives that were used to validate the flood hazard exposure specifically for the Hokianga area.

If this information is held in digital mapping formats (such as GIS shapefiles or KML/KMZ files), I would prefer to receive it in those original formats alongside any standard PDF reports.

As required by the Official Information Act, I look forward to your response within 20 working days.

Sincerely,
Joshua Riley

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