Weather

Weather events impact water quality. Heavy rains can cause erosion, introducing sediment into waterways. The sediment makes the water turbid and may also carry nutrients or contaminants into the water.

An example of a weather-related event is evident in this image of the confluence of the Waipā River and Waikato River after heavy rain.

Lack of rain can lower water levels, which may affect water flow and water temperature.

Weather is different from climate. Climate refers to weather conditions averaged over 30 years or more. In New Zealand, our climate indicates that winters tend to be wetter and cooler than summers. These conditions affect water temperature and pest plant growth (algal blooms). Global climate change may lead to warmer water temperatures.

Acknowledgement: John Greenwood, J Greenwood Photography