Flowpath Engineering Portal
TP108 Rainfall Charts — Auckland Design Rainfall Map Selector
Select return period and pinpoint site rainfall from Auckland Council TP108 2-year, 10-year and 100-year design rainfall maps. Apply SW CoP climate change factors for NZ stormwater design.
What this tool does
Auckland TP108 Rainfall Maps
Reference 2-year, 10-year and 100-year 24-hour design rainfall depth maps from Auckland Council Technical Publication 108 (TP108).
Climate Change Adjustment
Apply Auckland Council SW CoP climate change factors (2.1°C or 3.8°C temperature rise) to derive adjusted design rainfall for modern stormwater design.
Interactive Site Marker
Click on the rainfall map to drop a site marker, zoom and pan to pinpoint your location, then read off the rainfall percentile value.
Save & Restore Per Project
Persist selected return period, map marker position, and adjusted rainfall values against a project, then reload them later or update the saved record.
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Open TP108 Rainfall Chart SelectorPart of the Flowpath Engineering suite of free civil engineering tools for New Zealand.