Visualisation of Seepage Flows HM 169

Visualisation of Seepage Flows

Type: HM 169
Name: Visualisation of Seepage Flows
HM 169 - A product from the GUNT 2E range
Technical Description

  A descriptive method in the study of seepage and groundwater flow is the visualisation of the streamlines and their graphical representation as a flow net. The flow net provides information about the seepage of water in dams and sheet piles.
  HM 169 can be used to visualise streamlines in seepage and groundwater flow on different models using a contrast medium. Furthermore, the effects of water pressure on different structures are displayed as pressure curves.
  The trainer consists of a transparent tank with a sand filling. Various models can be placed in the sand bed to demonstrate typical structures. The experimental section is separated from the feed and discharge chambers by fine mesh screens. A valve is used to adjust the water supply. Using a contrast medium it is possible to make streamlines visible, as they occur in seepage and groundwater flow. A tempered glass viewing window allows for optimal observation of the experiments.
  Various models allow an extensive range of experiments, such as pressure distribution on retaining walls or seepage and groundwater flow under sheet piles. The "foundation" and "retaining wall" models are equipped with tubes to show the pressures on the models.
  In the experimental section there are measuring connections to detect groundwater levels. Groundwater levels are displayed on 14 tube manometers.
  HM 169 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.


Learning Objectives / Experiments

- determining flow nets in permeable media

  * streamlines under a sheet pile
  * streamlines through an earth dam
  * drainage at an open ditch
- determining the pressure curve at a foundation
- determining the pressure curve at a retaining wall
- groundwater levels over time in various models


* Visualisation of two-dimensional seepage and

  groundwater flows1
* Investigation of the water pressure on structures1
* Closed water circuit

Seepage Flow

[1] visualisation of two-dimensional seepage flows and investigation of water pressure at various models
[2] closed water circuit
[3] fluoresceine as a contrast medium
[4] experimental section with tempered glass viewing window
[5] fine-mesh screen to separate the experimental section from the feed and discharge chamber
[6] height-adjustable overflows in the feed and discharge to adjust the water levels
[7] 14 measuring connections with filters to detect the groundwater levels in the experimental section
[8] "sheet pile" model for visualisation of streamlines
[9] "retaining wall" and "foundation" models for demonstration of the water pressure
[10] instruments: tube manometers, tubes on the "foundation" and "retaining wall" models


Technical Data

Experimental section
- usable volume: 82L
- LxWxH: 1480x104x630mm
- max. flow rate: 4m³/h
- max. head: 4m
14 tube manometers: 0...600mmWC
Tank for contrast medium: content 0,5L
Storage tank, stainless steel: content 96L
- "sheet pile"
- "retaining wall"
- "foundation"


Dimensions and Weight LxWxH: 1900x800x1870mm
Weight: approx. 230kg Required for Operation 230V, 50/60Hz, 1 phase or 120V, 60Hz/CSA, 1 phase; sand (1...2mm grain size) Scope of Delivery 1 trainer
3 models
1L contrast medium
1 set of instructional material Order Details

070.16900  HM 169  Visualisation of Seepage