Journal of the Boston Society of Civil Engineers, Vol. 8: Contents and Index (Classic Reprint)

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Paperback | December 26, 2018

Journal of the Boston Society of Civil Engineers, Vol. 8: Contents and Index (Classic Reprint) by Unknown Author
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Excerpt from Journal of the Boston Society of Civil Engineers, Vol. 8: Contents and Index

The available stream-flow records extend back to 1900 only in a few cases, and the majority cover perhaps five to ten years. At present, some 5 3 river stations are being maintained. In New England, of which 22 are in the state of Maine. It is of great importance to the further development of water power that this river-gaging work be continued without interruption, and if possible with a wider scope.

Relative Yield of New England Streams. To ascertain the flow available and its variation during the year, for use in water power studies, flow-duration curves are prepared, in which for the period of time covered by the records the various amounts available by months (or sometimes weeks and days) are ar ranged in order of magnitude for the entire period, independent of calendar order. This curve shows the flow available for any given percentage of time and serves as a basis for the determina tion of the proper amount of wheel capacity and average power output.

On Fig. 5 is such a curve for the Nashua River, on the basis of monthly yield for the period 1897 - 1919, inclusive. The mean run-ofl of ins. Per month is available (or exceeded) about 39 per cent. Of the time, while for a small per cent. Of time the run-off is practically zero, due to the considerable water area, about 7 per cent. (and therefore evaporation), of the Wachusett Reservoir. It is also to be noted that the normal (or 50 per cent. Value) is ins. Per month, an amount per haps more logically representing the power value of the natural stream or of rivers where storage possibilities are limited. On Fig. 5 is also shown the order of months of the year in amount of run-off, and the average precipitation for each month. As previously noted, for Boston there is no great difference in average precipitation bv months, but run-ofl shows a much greater variation.

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Title:Journal of the Boston Society of Civil Engineers, Vol. 8: Contents and Index (Classic Reprint)Format:PaperbackDimensions:504 pages, 9 X 6 X 1.01 inPublished:December 26, 2018Publisher:FB&C LtdLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:1332043410

ISBN - 13:9781332043415

Appropriate for ages: All ages

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