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<br />tD '. <br />C0 <br />C'J <br />C\,l 60 <br />0 f- <br />'-' Z <br /> W <br /> () <br /> a: <br /> w <br /> a. 50 <br /> z <br /> <br />CLUSTER-WELL SITES: <br />. WG062 and WG071 <br />. WG044N and WG053N <br /> <br />!-" <br />z <br />W <br />f- <br />Z <br />o <br />() 40 <br />a: <br />w <br />f- <br />~ <br />() <br />a: 30 <br />w <br />f- <br />W <br />:::E <br />::J <br />-' <br />o <br />> <br />20 <br />o <br /> <br /> <br />~ <br /> <br />5 <br /> <br />10 15 20 <br />HYDRAULIC HEAD, IN FEET <br /> <br />25 <br /> <br />30 <br /> <br />FIGURE 6.--Relation between volumetric water content and hydraulic head for <br />cores taken from zone of water.table fluctuation at selected cluster-well sites. <br />Shows averaged values for cluster-well sites WG062 and WG071 and for <br />sites WG044N and WG053N. <br /> <br />Porosity <br /> <br />Porosity is the ratio of the total volume of voids within a rock or soil sample to the total volume of <br />the sample, and is reported as a decimal or percentage. The total porosity should not be confused with the <br />effective porosity, which refers to the volume of interconnected void spaces through which a fluid (usually <br />water) can be transmitted, The total porosity can be considerably larger than the effective porosity, <br />especially for fine-grained deposits. <br /> <br />Total porosities were estimated on the basis of laboratory measurements made on the same cores used <br />to estimate specific yield. The estimates were made using the following equation (Piper, 1933): <br /> <br />n = <br /> <br />(W/V,HW/V) <br />(W/V,) <br /> <br />(2) <br /> <br />where n = total porosity (dimensionless); <br />W, = weight of oven-dried particles, in grams; <br />V, = volume of solid particles, in cubic centimeters; and <br />V = total volume. in cubic centimeters. <br /> <br />-16- <br />