Run off measurement instrument

• The measurement system serves to record and examine surface run off and the erosion materials contained therein. The surface run off water is collected in a collection channel and quantified by a tipping counter before being filled into sample vessels. The start and intensity of the run off event is registered by an internal data logger.
  The final filling of the samples of the surface run off into up to 24 brown glass flasks is performed fully automatically and solely via water pumps. There are no bottlenecks which could clog, cause a congestion or lead to the reduction of the flow speed. The erosion material can thus be transported in the flowing water without impediment. Coarse dirt is already retained by a stainless steel sieve. In order to be able to ideally record the different run off events, the sampling frequency is adjusted by a microcomputer to the run off intensity. With low run off quantities the entire surface run off recorded by the collection channel is taken as sample in order to obtain a sample quantity which is as large as possible. By contrast with a considerable run off event, sample water is only taken at adjusted time intervals. The remaining water is discharged after having been quantified. This prevents the sample flasks filling too quickly and guarantees that the samples are distributed via the entire run off event With upstream connected run off dividers, both test parcels and also small capture areas up to 3 ha in size can be investigated. Combined with meteorological and hydrological measurement points a comprehensive picture of the run off and erosion processes can be obtained in this way. The entire system is made of rust free stainless steel which is inert to the samples. It is installed underground so as to generate the flow solely as the result of the height difference and not to be dependent on pumps and therefore to generate a free flow and minimise energy consumption.

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  Advantages

  • Fully automatic sampling
  • Sampling adjusted to the run off intensity
  • Water distribution solely via water points

• Technical data

  • Number of samples::	24
  • Sample volume:	1000 ml
  • Energy supply:	Replaceable storage battery 12 V/10 Ah Also solar panels on request