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Table 6 Productivity, well yield and water use information for mapped aquifers
Tag Productivity Demand Type of Water Use Reliance on Source
Well Yield (L/s)
197
Moderate
Moderate Multiple
Conjunctive (surface water, bedrock)
0.63 (0.01 - 17.35)
199
Moderate
Moderate Multiple
No aquifer classification worksheet available
201
Moderate
Moderate Domestic
Conjunctive (surface water)
0.76 (0.38 - 4.73)
205
Moderate
Moderate Multiple
Conjunctive (surface water)
0.85 (0.19 - 3.16)
206
Moderate
Moderate Multiple
Conjunctive (surface water, bedrock)
0.75 (0.09 - 22.1)
196
Low
Low
Domestic
Conjunctive (surface water)
0.13 (0.02 - 0.63)
198
Low
Low
Domestic
Conjunctive (surface water, surficial aquifer)
0.13 (0.06 - 1.26)
200
Low
Low
Domestic
Conjunctive (surface water)
0.19 (0.02 - 1.58)
202
Low
Moderate Multiple
Conjunctive (surface water)
0.19 (0.02 - 5.68)
203
Low
Moderate Multiple
Conjunctive (surface water)
0.19 (0.01
to 4.42)
204
Moderate
Moderate Multiple
Conjunctive (surface water, surficial aquifer)
0.25 (0.03 – 8.52)
207
Moderate
Moderate Multiple
Conjunctive (surface water, surficial aquifer)
0.25 (0.02 - 12.62)
208
Moderate
Low
Domestic
Conjunctive (surface water)
0.38 (0.03
to 3.79)
Notes
Aquifer tags and productivity/demand rankings from MOE (BC Water Resources Atlas; MOE, 1994). Type of water use, reliance on
source and well yield estimates derived from aquifer classification worksheets. Well yields in brackets indicate ranges; values
before brackets indicate median values
The relative proportion of current groundwater and surface water use is not currently known with precision,
since groundwater usage within the South Cowichan area is not metered or regulated. More detailed
information on well yields and aquifer transmissivity is being compiled in a joint venture between the
Geological Survey of Canada (GSC) and the MOE, conducted at Simon Fraser University (SFU) under the
lead of Dr. Dianna Allen. The purpose of this study is to provide quantitative estimates of aquifer
hydrogeologic properties based on compilation of well installation and testing reports (Jessica Liggett,
SFU, personal communication). The SFU project has been ongoing concurrently with this Phase 1 water
study. As such, findings from the SFU project could not yet be incorporated in this report.
2.5.10
Observat ion Wel l Network
Table 7 below summarizes the five MOE observation wells within the Study Area, the locations of which
are shown on Figure 6. Three active observation wells have been completed in the Cherry Point Aquifer
(197): #233 (
Cowichan Bay), #320 (Braithwaite Estates), and #345 (Arbutus Ridge). Two additional wells
(#255
and #256) appear to have been completed in the Cobble Hill bedrock aquifer while the remaining
well (#350) is located in a gravel pit in the Mill Bay Aquifer #206.
Observation well hydrographs for the Cherry Point observation wells are provided in Figure 8 together with
precipitation data for the period of record.
