Pacific Gas and Electric magazine . Pacific Sermce Magazine 375 sas of this diagram give the time and theordinates the total number of acre feetof water which would have collected insuch imaginary reservoir of unlimitedextent. The valuable property of such curve is that the tangent to the curve atany point may be taken to represent therate of inflow from the river or thequantity of water actually flowing in thestream at the time in question. \ fv 1 i / i / 10 / _^ 1 / Si^ 1 •? :; i 1 * i> ^ >- ^ —^— : y : - f t# S i- 1 r^ 3 0-»;kS 3V^li~^-^Sr. K / ( MASS CURVE N? 2 / rsmrii!:^^^? 376 Pac
Pacific Gas and Electric magazine . Pacific Sermce Magazine 375 sas of this diagram give the time and theordinates the total number of acre feetof water which would have collected insuch imaginary reservoir of unlimitedextent. The valuable property of such curve is that the tangent to the curve atany point may be taken to represent therate of inflow from the river or thequantity of water actually flowing in thestream at the time in question. \ fv 1 i / i / 10 / _^ 1 / Si^ 1 •? :; i 1 * i> ^ >- ^ —^— : y : - f t# S i- 1 r^ 3 0-»;kS 3V^li~^-^Sr. K / ( MASS CURVE N? 2 / rsmrii!:^^^? 376 Pacific Service Magazine. Lake Spaiilding affords a practical illustration of water fuel. To Ihc right of tlie diagram have beenshown various slope lines representingdefinite rates of tlow. By comparing thetangent at the point in question to suchlines, flow in the stream can be readilyascertained for any lime. Now then as to the manner in which astudy of such mass diagram may helpus. We see from the South Yuba diagramthat after each dry season indicated bythe horizontal (or nearly so) portions ofthe curve, there occurs a gradual increaseof slope which represents a gradual in-crease of flow, and this increase in eachyear of record has been practically con-tinuous, increasing rather rapidly andnever again falling off until the next sum-mer or dry season. In comparison to thisI will call attention to the mass curveNo. 2 which is drawn for an imaginarystream. A study of this will show thatat the end of the main dry season theslope rises for a period, then flattens outagain for a week or two, again rises, againflat
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