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Products  |  Fluid Mechanics  |  Hydraulics for Civil Engineering  |  HM 141
HM 141 Hydrographs after Precipitation Show data sheet (pdf file) Print page
HM 141 - A product from the GUNT 2E range
Technical Description

  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.
  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.


Learning Objectives / Experiments

- 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

- influence of rainwater retention basin on the



* Effect of precipitation on soils1
* Drainage of the soil either through drainage pipe

  or drain chamber with screen1
* Recording of hydrographs1
* Influence of rainwater retention basin on the

* Precipitation time, lag time and measurement time

  can be adjusted via separate timers

Alternative products
HM 165 -- Studies in Hydrology
Seepage Flow

[1] investigation of the effect of precipitation on soils
[2] stainless steel experiment tank with transparent splash guard
[3] precipitation device with two nozzles, adjustable precipitation area and quantity
[4] precipitation time can be adjusted via solenoid valve with timer
[5] distribution to 17 chambers by timer
[6] mobile sled carriage distributes draining water to 17 chambers in the measuring tank
[7] water drain either via removable drain chamber with fine-mesh screen or via drainage pipe
[8] separate flushing connection for pipelines
[9] drip pans as rainwater retention basins
[10] rotameter (inlet), indicator of precipitation time, lag time and measurement time


Technical Data

Experimental section
- volume: 1.300x600x200mm
- 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: 17x0,9L
- 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 range
- flow rate: 30...320L/h


Dimensions and Weight
LxWxH: 1.600x1.000x1.475mm
Weight: approx. 195kg
Required for Operation
230V, 50/60Hz, 1 phase or 120V, 60Hz/CSA, 1 phase; coarse sand, grain size 1...2,5mm
Water connection, water drain
Scope of Delivery
1 trainer, 4 drip pans, 1 set of hoses, 1 set of instructional material
Order Details

070.14100  HM 141  Hydrographs after


© 2005 G.U.N.T. Gerätebau GmbH