Castelli, Benedetto
,
Of the mensuration of running waters
,
1661
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much as it ran before; ſo that when the water ſhall be quadru
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ple, the height ſhall be double; and if the water were centuple,
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the height would be decuple onely, and ſo from one quantity
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to another: And on the contrary, in the Diverſions; If of the
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100. parts of water that run thorow a River, there ſhall be di
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verted 19/160, the height of the River diminiſheth onely 1/10, and con
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tinuing to divert 17/100, the height of the River abateth likewiſe 1/10,
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and ſo proceeding to divert 15/100 and then 13/100, and then 11/100, and
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then 9/100, and then 7/100, and then 5/100, and then 3/106, alwaies by
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each of theſe diverſions, the height of the Running Water di
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miniſheth the tenth part: although that the diverſions be ſo une.
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<
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>qual. </
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>Reflecting I ſay upon this infallible Truth, I have had a
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conceit, that though the
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Reno
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and other Rivers were diverted
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from the Valleyes, and there was onely left the
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Chanel of Navi
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gation,
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which was onely the 1/20 part of the whole water that fal
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leth into the Valleys; yet nevertheleſs, the water in thoſe ſame
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Valleyes would retain a tenth part of that height that became
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conjoyned by the concourſe of all the Rivers: And therefore I
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ſhould think that it were the beſt reſolution to maintain the
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Gha
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nel of Navigation
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(if it were poſſible) continuate unto the P
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o
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of
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Ferrara,
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and from thence to carry it into the P
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o
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of
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Volano
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; for
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beſides that it would be of very great eaſe in the Navigation of
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Bologna,
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and
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Ferrara,
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the ſaid water would render the P
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o
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oſ
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Volano
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navigable as far as to the very Walls of
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Ferrara,
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and con
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ſequently the Navigation would be continuate from
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Bologna
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to
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the Sea-ſide.</
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>But to manage this enterprize well, it is neceſſary to meaſure
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the quantity of the Water that the Rivers diſcharge into the Val
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leys, and that which the
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Chanel of Navigation
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carryeth, in man
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ner as I have demonſtrated at the beginning of this Book; for this
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once known, we ſhall alſo come to know, how profitable this di
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verſion of the
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Chanel of Navigation
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from the Valleys is like to
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prove; which yet would ſtill be unprofitable, if ſo be that all
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the Rivers that diſcharge their waters into the Valleys, ſhould
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not ſirſt be Drained, according to what hath been above ad
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vertiſed.</
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<
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>Abbot CASTELLI,
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in the preſent conſideration referring
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himfelf to the Relation of
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Monſig. </
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<
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>Corſini,
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grounded upon the Ob
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ſervations and Precepts of the ſaid Abbot; as is ſeen in the pre
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ſent Diſcourſe. </
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<
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>I thought it convenient for the compleating of the
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Work of our Aulhour, upon theſe ſubjects, to inſert it in this
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place.
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