GeoPark Kaolinrevier Hirschau
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InfoPoint No. 14
 

 

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Measuring surface water
Since 1999, the measuring point at InfoPoint No. 12 has registered the amount of water flowing from the Weitzendorf Stream at hourly intervals. This represents the water draining from an area of 2.7 square kilometres. The quality of the water is measured as well as the quantity.

Amberg’s kaolin factories use the data thus obtained to produce the chief statistics relating to water flows in this district and can provide information about the regeneration of groundwater and what happens when there is flooding. The water that drains from this source could be used in future to supply water to the planned lakes.

In streams with limited drainage, the outflow can be determined fairly exactly with the help of defined Überfallwerte (overfall data) as long as there is no flow velocity before the water passes the weir. Only gravity may cause the water to flow over the weir.

 

Measuring the flow of water
1. The height of the fall (H) is read off on the water-level gauge.

2. The flow is calculated by comparing this figure with the diagrams.

At times when less than two litres of water per second are draining off, the figures can be ascertained by means of a measuring vessel. It is then necessary to count how many seconds it takes for the vessel to fill.

If too much water is draining off for it to be possible to use such a vessel, the measurement is obtained by using a flow sensor. The calibration curve is created on the basis of the figures obtained.

 

 

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Water Flows at the Measuring Point since 1999

Maximum flow in flood period
849.4 litres per second

Average flow in flood period
173.9 litres per second

Average flow
31.5 litres per second

Average flow in low-water period
9.1 litres per second

Minimum flow
0.0 litres per second