The HM 145 trainer offers studies in hydrology such as seepage and movement of the water in soils. In addition, river courses and surface water are investigated. Furthermore, sediment transport and siltation are also presented in the context of flow obstacles. Variable precipitation density and areas and different groundwater feed and discharge possibilities allow a wide variety of experiments.
  The core element of the trainer is a sand-filled experiment tank with inclination adjustment. The water is supplied either via an feed chamber or a precipitation device, which uses a timer to allow time-defined precipitation.
  The experimental section is separated from the feed and discharge chambers by fine mesh screens. There are two wells with perforated tubes or a discharge chamber with drainage screen available for the investigation of various drainage systems. Additionally, storm overflows can be placed in the discharge chamber to influence the ground water level in the experimental section. All water feeds and discharges can be adjusted separately via valves.
  Three different models for pillars also allow the investigation of flow around bodies, erosion and siltation in the river bed.
  In the experimental section there are measuring connections to detect groundwater levels. Groundwater levels are displayed on a 19-fold tube manometer. The water supply is controlled by valves and read at two flow meters with different measuring ranges. 
  The water drain is determined by a measuring weir. The amount of sediment transported is measured with the aid of a balance.
  The measured values are read from digital displays and can at the

same time be transmitted via USB directly to a PC where they can be analysed using the software included.
  HM 145 contains a closed water circuit with storage tank and pump.
  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.
 

- effect of precipitation of varying duration on soils

  with different saturation
- investigating the seepage flow
- investigating the storage capacity of a soil
- studying how wells affect the groundwater level over

  time
- flow behaviour of rivers, obstacles in the river bed,

  sediment transport in rivers