Castelli, Benedetto, Of the mensuration of running waters, 1661

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              <s>
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              think of returning this Torrent into the divided P
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              o,
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              by reaſon of
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              the peril that would thence redound to this City.</s>
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            <p type="main">
              <s>And that going by
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              Torre del Fondo,
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              through
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              Sanmartina
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              to
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              the Mouth
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              de Maſi
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              by the Chappel of
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              Vigarano
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              unto the Sea, it is
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              by this way 70. miles; nor is the Fall greater than 26. 5. 6. Feet, ſo
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              that it would come to fall but 4. inches & an half, or thereabouts
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              in a mile; whereas the common opinion of the skilfull (to the
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              end that the Torrents may not depoſe their ſand that they bring
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              with them in Land-Floods) requireth the twenty fourth part of
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              the hundredth part of their whole length, which in our caſe,
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              accounting according to the meaſure of theſe places, is 16. inches
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                <arrow.to.target n="marg981"/>
                <lb/>
              a ^{*} mile; whereupon the ſinking of the Mud and Sand would
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              moſt certainly follow, and ſo an immenſe heightning of the Line
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              of the Bottom, and conſequently a neceſſity of raiſing the Banks,
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              the impoſſibility of maintaining them, the danger of breaches
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              and decayes, things very prejudicial to the
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              Iſlets
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              of this City, and
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              of
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              San Giorgio,
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              the obſtruction of the Drains, which from the
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              Tower of
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              Tienne
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              downwards, fall into the ſaid Chanel; to wit,
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              thoſe of the Sluices of
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              Goro,
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              and the Drains, of the Meadows of
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                <emph type="italics"/>
              Ferrara
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              : And moreover, the damages that would ariſe unto the
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              ſaid
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              Iſlet
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              of S.
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              Giorgio,
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              and the Valleys of
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              Comachio,
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              by the wa­
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              ters that ſhould enter into the
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              Goro
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              or Dam of the Mills of
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              Belri­
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              guardo,
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              thorow the Trenches of
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              Quadrea,
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              which cannot be ſtopt,
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              becauſe they belong to the Duke of
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              Modena,
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              who hath right of
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              diverting the waters of that place at his pleaſure to the work of
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              turning Mills.</s>
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            <p type="margin">
              <s>
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              * The inch of
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              theſe places is
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              ſomewhat bigger
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              than ours.</s>
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              <s>The greater part of which Objections, others pretend to prove
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              frivolous, by ſaying, that its running there till at the laſt it was
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              turned another way, is a ſign that it had made ſuch an elevation
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              of the Line, of its Bed as it required; denying that it needeth
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              ſo great a declivity as is mentioned above; and that for the fu­
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              ture it would riſe no more.</s>
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            <p type="main">
              <s>That the ſaid Dra ns and Ditches did empty into the ſame,
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              whilſt P
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              o
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              was there; ſo that they muſt needs be more able to do
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              ſo when onely
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              Reno
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              runs that way.</s>
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              <s>That there would no Breaches follow, or if they did, they
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              would be onely of the water of
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              Reno,
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              which in few hours might
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              be taken away (in thoſe parts they call damming up of Breaches,
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              and mending the Bank,
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              taking away the Breaches
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              ) and its a que­
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              ſtion whether they would procure more inconvenience than bene­
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              fit, for that its Mud and Sand might in many places, by filling
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              them up, occaſion a ſeaſonable improvement.</s>
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            <p type="main">
              <s>Now omitting to diſcourſe of the ſolidity of the reaſons on the
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              oneſide, or on the other, I will produce thoſe that move me to
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              ſuſpend my allowance of this deſign.</s>
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