Modeling GCW Efficiency |
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Successful application of GCW technology requires that its zone of influence (ZOI) be known and predicted prior to installation. For each GCW System, a unique, site-specific hydraulic zone of influence will be established.
Dr. Herrling (1992) and Dr. Stamm (1997) of the
Aquifer ParametersThe site-specific aquifer parameters clearly exert the greatest influence on GCW Operation and efficiency. The following are typical of those factors considered important in the proper selection and design of a GCW System:
Engineering and Design ParametersThe hydraulic influence of a GCW System also depends on a number of engineering and design parameters specific to a given application. Specifically,
MODELLING THEÂ ZONE OF INFLUENCE (ZOI) OF A GCW
|
Input parameters |
Data |
Thickness of aquifer (m) |
7,00 |
Well discharge through GCW; Q (m³/h); Estimated base on site hydrogeology |
4,00 |
Effective Porosity, % |
0,20 |
Screen length of GCW - m - |
2,00 |
Horizontal hydraulic conductivity –Kh (m/sec) |
5,5E-5 |
Vertical hydraulic conductivity Kv (m/sec), Assumed Kh/Kv = 10 |
5,5E-6 |
Groundwater velocity – Va( m/d) |
0,08316 |
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1)Â The upstream and downstream stagnation point (S) = 26m
2)Â The bottom width of capture zone (Bb) = 75m
3)Â The top width of capture zone (Bt) = 28m
4)Â The distance D (maximum space between GCW systems) = 57m
5) Circulation time (that required for a unit volume of water to move from the outflow zone of the well through the zone of influence of the GCW system, and back into the inflow zone of the well)