{"id":72,"date":"2022-04-21T17:42:15","date_gmt":"2022-04-21T17:42:15","guid":{"rendered":"https:\/\/books.gw-project.org\/water-well-record-databases-and-their-uses\/chapter\/box-5-use-of-well-record-data-to-compare-yield-distributions\/"},"modified":"2022-07-15T03:43:10","modified_gmt":"2022-07-15T03:43:10","slug":"box-5-use-of-well-record-data-to-compare-yield-distributions","status":"publish","type":"chapter","link":"https:\/\/books.gw-project.org\/water-well-record-databases-and-their-uses\/chapter\/box-5-use-of-well-record-data-to-compare-yield-distributions\/","title":{"raw":"Box 5 Use of Well Record Data to Compare Yield Distributions","rendered":"Box 5 Use of Well Record Data to Compare Yield Distributions"},"content":{"raw":"
\r\n

Using available well record data from Finland (Central Finland Regional Environment Centre, 2007), Norway (Morland, 1997; Geological Survey of Norway, 2008) and Sweden (Gustafson, 2002), Banks and others (2010) compared the distribution of short-term yields from crystalline bedrock types. Despite differences in lithologies, climate and tectonic history between the countries, the yields in the datasets showed a remarkably similar distribution (Figure\u00a0Box\u00a05-1). In addition, although wells drilled in crystalline bedrock can exhibit a wide range of yields, the median well yield of all three datasets was in the 600 to 700\u00a0L\/h range. Based on these results, the apparent bulk transmissivity based on an observed empirical relationship between short-term specific capacity and apparent transmissivity in crystalline rocks of the upper 70 to 80\u00a0m of crystalline bedrock aquifers in this region was estimated to be about 0.56\u00b10.3\u00a0m2<\/sup>\/d. An understanding of the statistical distribution of hydraulic properties of crystalline bedrock aquifers is needed to inform cost-effective drilling strategies in these types of aquifers.<\/p>\r\n

\"Graph<\/p>\r\n

Figure\u00a0Box\u00a05<\/strong>-<\/strong>1\u00a0<\/strong>\u2013<\/strong>\u00a0<\/strong>Comparison of the distribution of short-term well yield in crystalline bedrock aquifers of Central Finland (n=1297), Norway (Caledonian metasediments, n=2098; all crystalline rock, n=26,811) and Sweden (n=59,000). Note the probability scale on the y-axis and the logarithmic scale on the x-axis (from Banks et al., 2010).<\/p>\r\n

Return to <\/span><\/a>where the text links to Box\u00a05<\/span><\/a><\/p>\r\n

<\/p>\r\n\r\n<\/div>","rendered":"

\n

Using available well record data from Finland (Central Finland Regional Environment Centre, 2007), Norway (Morland, 1997; Geological Survey of Norway, 2008) and Sweden (Gustafson, 2002), Banks and others (2010) compared the distribution of short-term yields from crystalline bedrock types. Despite differences in lithologies, climate and tectonic history between the countries, the yields in the datasets showed a remarkably similar distribution (Figure\u00a0Box\u00a05-1). In addition, although wells drilled in crystalline bedrock can exhibit a wide range of yields, the median well yield of all three datasets was in the 600 to 700\u00a0L\/h range. Based on these results, the apparent bulk transmissivity based on an observed empirical relationship between short-term specific capacity and apparent transmissivity in crystalline rocks of the upper 70 to 80\u00a0m of crystalline bedrock aquifers in this region was estimated to be about 0.56\u00b10.3\u00a0m2<\/sup>\/d. An understanding of the statistical distribution of hydraulic properties of crystalline bedrock aquifers is needed to inform cost-effective drilling strategies in these types of aquifers.<\/p>\n

\"Graph<\/p>\n

Figure\u00a0Box\u00a05<\/strong>–<\/strong>1\u00a0<\/strong>\u2013<\/strong>\u00a0<\/strong>Comparison of the distribution of short-term well yield in crystalline bedrock aquifers of Central Finland (n=1297), Norway (Caledonian metasediments, n=2098; all crystalline rock, n=26,811) and Sweden (n=59,000). Note the probability scale on the y-axis and the logarithmic scale on the x-axis (from Banks et al., 2010).<\/p>\n

Return to <\/span><\/a>where the text links to Box\u00a05<\/span><\/a><\/p>\n

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