HM 141 Hydrographs after precipitation
Hydrographs are an important tool for the representation of hydrological data such as precipitation, groundwater levels or discharges.
HM 141 produces precipitation of varying duration and intensity. The storage capacity of soils with different saturation is also examined. Using various dewatering is examined it is possible to demonstrate the relationships between precipitation and seepage.
The trainer includes a tank with a sand filling, which is flowed through by water. The water is supplied to the tank via a precipitation device with two nozzles that can be adjusted separately via valves. To study different drainages, the water is drained either via a drainage pipe or a drain chamber, which is separated from the experimental section by a screen.
The draining water is distributed over 17 transparent chambers. This creates a profile over time of the water drain. The water levels are measured and plotted in a hydrograph.
Drip pans can be used to demonstrate the lag of the drainage through rainwater retention basins.
The water supply is controlled by a valve and read on a flow meter. The timed discharges are adjusted via electronic timers.
- effect of precipitation on soils
- drainage of the soil either through drainage pipe or drain chamber with screen
- recording of hydrographs
- influence of rainwater retention basin on the hydrograph
- precipitation time, lag time and measurement time can be adjusted via separate timers
Experimental section
- volume: 1300x600x200mm
- max. sand height: 185mm
Precipitation device
- 2 nozzles, individually adjustable
- flow rate: 1…6,7L/min, square spray pattern
- precipitation: max. 320L/h
Measuring tank with 17 chambers
- volume: 17×0,9L
Timers
- precipitation: max. 99min59s
- lag time until start of measurements: max. 99min59s
- measurement time per chamber: max. 99min59s
4 drip pans: 305x215x55mm
Steel scale: 200mm
Measuring ranges
- flow rate: 30…320L/h
230V, 50Hz, 1 phase
230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase
UL/CSA optional
- investigation of the effect of precipitation on soils
- stainless steel experimental tank with transparent splash guard
- precipitation device with two nozzles, adjustable precipitation area and quantity
- precipitation time can be adjusted via solenoid valve with timer
- distribution to 17 chambers by timer
- mobile sled carriage distributes draining water to 17 chambers in the measuring tank
- water drain either via removable drain chamber with fine-mesh screen or via drainage pipe
- separate flushing connection for pipelines
- drip pans as rainwater retention basins
- rotameter (inlet), indicator of precipitation time, lag time and measurement time
- effect of precipitation of varying duration or intensity on soils with different saturation
- record hydrographs after precipitation
- storage capacity of soils with different saturation
- compare natural dewatering with dewatering via drainage pipe
- influence of rainwater retention basin on the hydrograph
