Erosion, slips, landslide

While only 2% of the district, (or 3,282.73 hectares) has an erosion potential of moderate or severe, the adjacent map "Erosion potential" shows that one of the most severe of these areas is in the Kaimai Ranges above Te Aroha. Movement in this area could cause severe effects in Te Aroha which is located on alluvial fans between the Kaimai Ranges and the Waihou River. These alluvial fan deposits are very unstable and prone to landslide, slips and erosion.

The adjacent map "Slope Class" shows the areas within the district that have a slope of 20º or greater which could potentially become erosion prone and cause slips.

The bottom map to the right shows the areas with slope greater that 20 degrees that are vegetated.

Vegetation cover (trees, or scrub not pasture) improves slope stability. 50% of slopes over 20 degrees are vegetated, and 50% are not.

Over the past year four applications have been granted for development on potentially unstable land