River levels and rainfall
Within this topic:
• 0832 InfoLines • Floods and flow • Monitoring the environment • Provisional Data Disclaimer • Rainfall Map • Rainfall - latest reading • Regional River Level and Rainfall Situation Report • River levels and flow map • River levels and flow - latest reading
On this page:
Environment Waikato’s automated recorder sites constantly check on river levels and rainfall around the region. The information is sent electronically to our Hamilton office.
The information on these web pages is updated every three hours. Information is stated in NZ standard time (no allowance is made for daylight saving). In times of flood this information may get updated more frequently - during flood events you can check out our latest flooding situation report on our homepage.
River levels and rainfall - last seven days
Use our maps to see river levels and rainfall readings in your area for the last seven days.
All data is provisional. Contact Environment Waikato if you require more precise information.
Check out the latest river levels and rainfall readings taken at our monitoring sites.
You can use our 0832 InfoLines service to get the latest readings by telephone at each recording site including: river level, rainfall, barometric pressure, wind speed, wind direction, air temperature and river flow.
Why monitor rivers and rainfall?
Floods
Environment Waikato has responsibilities for managing flood risk in the Waikato region. We keep track of river levels to see how quickly rivers are rising during storms. We have flood warning systems in place to help us manage floods to protect people and their property.
Find out more about river flooding in the Waikato Region.
Rainfall
We also need to know how much rain is falling at sites around the region. Our rainfall graphs show the running (cumulative) total over the last week. Knowing how much rain has fallen helps:
- predict river levels - for example, will they continue to get higher or will they start to fall?
- show how wet the ground is, allowing us to estimate how much more rain the land can soak up, or if it will go straight into rivers.
It can take a long time for rain falling in the headwaters of a catchment to reach the lower stretches of a river. This means that people living close to rivers may not know that river levels are going to rise because they have had little rain on their property.
For example, it can take days for water in the Waikato River to travel from the headwaters to Port Waikato. But if land in the catchment is already very wet, then travel times are shortened. On smaller rivers such as the Ohinemuri, travel times can be much shorter, perhaps only hours. Keeping an eye on rainfall upstream helps people manage their flood risk.
Southern Oscillation Index (SOI)
Find out about how the Southern Oscillation Index impacts on the river levels and rainfall in the Waikato region.
Low flows
In some areas the opposite of flooding causes problems. River levels can fall during long dry periods. Our automated recorder sites alert us when there are low flows, and we may start on-site monitoring of streams in sensitive areas. We need to monitor the amount of water being taken to ensure there is enough water for:
- drinking water, irrigation and waste treatment
- other uses, such as recreation
- fish, plants and other animals.
Water can be used for domestic needs or for stock in small amounts as long as there is little effect on water flows. In most other cases, a resource consent is necessary to take water.
Recreation
People use many rivers in the Waikato region for recreation. Rafters, trout fishers or kayakers are interested in river levels to plan their activities.
Weather and tide links
MetService - Special Weather Bulletins
Land Information New Zealand – Tidal Predictions
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