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HM 141 Rainfall Hydrograph Show data sheet (pdf file)
Technical Description
The HM 141 is used to demonstrate the hydrological phenomena of rainfall. It shows the relationships between rainfall and the seepage of rainwater. A stainless steel tank filled with gravel acts as the ground. The water can be drained from the ground using a drainage tube or a filter. A time-controlled motorised water drain distributes the leakage water to 17 transparent measuring tanks. This allows a chronological profile of the discharge of water from the ground to be identified. The ground sample is irrigated by 2 nozzles that can be separately selected using ball valves. A solenoid valve releases the rain. The quantity of rain is adjusted using a control valve and a flow meter. 3 electronic time switches control the irrigation time, the delay time and the measuring time. The unit includes an extra cleaning connection for cleaning the tubes. A tarpaulin is supplied for experiments including a non-permeable layer. Plastic containers that can be inserted in the tank act as rain storage reservoirs.
Learning Objectives / Experiments
- Investigation of the effect of rainfall of varying
  duration on soil of varying saturation
- Hydrography of different types of irrigation
- Hydrography of saturated or dry gravel
- Investigations of water seepage
- Investigation of capacity of soil to store water
- Ground as a storage medium for water
- Ground with a non-permeable layer
- Comparison of natural and man-made drainage
  (tile drain)
- Influence of sources on the flow of groundwater
- Overflow of rain storage reservoirs
Features
* Investigation of the effect of rainfall on the ground
* Drainage of experimental ground either by drainage
  tube or lateral filter
* Irrigation time, delay time and measuring time
  adjustable using separate time switches
* Automatic filling of measuring tank after starting
Alternative products
HM 165 -- Basic Hydrology System
Specification
[1] Mobile laboratory rainfall hydrograph unit, irrigation surface 0.6x1.2m
[2] Stainless steel experimental tank with sprinkler system and transparent splash guard
[3] Sprinkler system: Adjustable rain quantity, 2 irrigation nozzles with separate ball valve
[4] Water drain either via lateral filter or permeable pipe for tile drain
[5] Irrigation, measuring and delay time controlled by 3 independent electronic timers with solenoid valve
[6] 17 measuring tanks, water outlet on carriage
[7] Separate connection for pipe cleaning
[8] 230V, 50Hz, 1 phase
Technical Data
Experimental tank: 1200x600x200mm, suitable for ground samples up to max. 18.5cm layer thickness
Measuring tank: 17x0.5ltr
Carriage with gear motor and V-belt
2 Conical nozzles with square spray, flow rate at 2bar: 2.2ltr/min each, rain flow: max. 280ltr/h
Stopwatches: rain time: max. 99min59s, delay time before start of measurement: max. 99min59s, measuring time per tank: max. 99min59s
Flow meter: 0...280ltr/h
Dimensions and Weight
l x w x h : 1600 x 1000 x 1500 mm
Weight : approx. 210 kg
Connections
230V, 50Hz, 1 Hz
Water supply min. 4.4ltr/min, 2 bar
Scope of Delivery
1 mobile unit HM 141, 4 plastic tanks, 350x240x40mm, 1 impermeable PE sheet, 1 graduated metal rule, 200mm, 1 instruction manual
Order Details
070.14100  HM 141  Rainfall Hydrograph
© 2005 G.U.N.T. Gerätebau GmbH