RIMU hydrology situation report. 5 May 2021
Author:Kolt Johnson, Auckland Council Research and Evaluation Unit, RIMU
Source:Auckland Council Research and Evaluation Unit, RIMU
Regional summary for April 2021
The New Zealand Drought Index for the Auckland Region dropped below the first category of Dry on 16 April and decreased throughout the month. The total rainfall for April was at or above the long-term average for most sites and the regional average total for April was 98mm. Soil moisture at all sites is within the normal range, except for one site in the north. Most rivers are above the mean annual low flow (MALF), except for the Hoteo River, Wairoa River, and some urban streams. Groundwater levels remain at similar levels to the last report. Low groundwater levels persist in deep aquifers and those aquifers which respond slowly to rainfall, most of which are in Franklin and are important sources for irrigation. ...