Havaintokeruuta

Havaintokeruuta, also known as the observation well, is a type of well designed to monitor groundwater levels and quality. It is typically constructed with a casing that extends from the surface to a depth where the groundwater is encountered. The casing is usually made of materials such as steel or PVC, and it is sealed at the bottom to prevent surface water from contaminating the groundwater. The casing is also sealed at the top to prevent groundwater from escaping.

The observation well is equipped with a water level indicator, which is a device that measures the depth of the groundwater in the well. The water level indicator can be a simple float and pointer system, or it can be a more sophisticated electronic device. The water level indicator is connected to a data logger, which records the water level at regular intervals. The data logger can be programmed to record the water level at intervals ranging from a few minutes to several hours.

The observation well can also be equipped with a groundwater sampling port, which allows water samples to be collected from the well for analysis. The sampling port is typically located at the bottom of the well, and it is sealed with a valve that can be opened to collect a sample.

The observation well is an important tool for monitoring groundwater resources and for understanding the hydrology of an area. It can be used to track changes in groundwater levels over time, to identify trends in groundwater quality, and to assess the impact of human activities on groundwater resources. Observation wells are typically installed by hydrologists or geologists, and they are maintained and monitored by groundwater management agencies.