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Long-Term Yield Calculation:
The calculated long-term yield is based on 70% of the available drawdown being used over twenty years (seven log cycles). The analysis uses the results from three parts of an aquifer test.
The first part of the analysis is the specific capacity, measured after 10 minutes (one log cycle) of pumping. The value for this parameter is a reflection of the water well completion and the characteristics of the aquifer at the interface between the borehole and the aquifer.
The second part of the analysis is the drawdown reflecting the hydraulic properties of the aquifer adjacent to the borehole. This transmissivity is referred to as the aquifer transmissivity and governs the drawdown in the water well until aquifer boundaries have been intersected. Typically, the aquifer transmissivity affects drawdown for one or two log cycles.
Once the cone of depression has intersected all the hydraulic boundaries of the aquifer, there is a resultant effective transmissivity for the aquifer, which is the third part of the analysis. This transmissivity affects the time rate of drawdown from the time when the effective transmissivity trend intersects the water level trend from the aquifer transmissivity until the end of groundwater use.
If all conditions have been met and 70% of the available drawdown is used in 20 years, the remaining 30% of the available drawdown is sufficient to provide the supply for at least 200 years. |
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ATS Coordinate Query:
Enter an A.T.S. legal description to retrieve the spatial location and ground elevation of the centre of the legal location.
The coordinates will be listed below in both NAD27 and NAD83 Datums. The coordinates are also presented in three projections: 10TM, UTM and Geographic.
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