Groundwater Flow Apparatus — MOE Lab Tender Details

Groundwater Flow Apparatus for Fluid Mechanics Engineering Lab Equipments

A bench-standing sand tank capable of demonstrating, on a small scale, the hydrological principles of ground water flow.
The unit should allow simple three dimensional flow situations to be set up quickly and measurements of piezometric levels taken at appropriate positions within the model under study.
It should be possess the following demonstration capabilities
a. Hydraulic gradients in ground water flow, including the effect of permeability.
b. Cone of depression for a single well in an unconfirmed aquifer.  
c. Abstraction from a single well in a confined aquifer.
d. Cone of depression for two wells. e. De-watering of an excavation site using two wells.
f. Draining of a polder or lake.
Should be capable to construct further model situations for study.
Other Requirments are:
a. The sand tank  must be of glass reinforced plastic
b. A diffused water inlet/outlet with associated flow control valve should be provided at each end of the sand tank.  
c. Two wells with control taps in the base of the tank
d. Nineteen tappings in the base of the tank arranged in a cruciform configuration connected to a multi-tube manometer on the side of the tank. A sliding cursor to measure of any level. Tank:- Length:990mm Width:490mm Depth: 235mm Mamometer:- Range:0to155mm
Calibrated: 1mm intervals
Experiment Capabilities:
Hydraulic gradient (Darcy's Law) resulting from groundwater flow between two potentials can be demonstrated visually. Levels in the piezometer tubes can plotted to show a linear profile.
Water flowing into a well creates a depression in the water table. The contour of the water table can be plotted using the levels in the Piezometer tubes. Results obtained can be compared with Depuit's or Thiem's formulae.
A profile of the water table can be obtained when using two wells simultaneously
A rectangular ring should be provided to form the sides of an excavation below the level of the water table.
A large rectangular ring should be used to create a polder or lake. Water flowing into a ditch near the wall should drain via the two wells.