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</html><thumbnail_url>https://irriworks.com/wp-content/uploads/2021/05/hazen-williams-3.png</thumbnail_url><thumbnail_width>154</thumbnail_width><thumbnail_height>51</thumbnail_height><description>Nella progettazione dei sistemi di irrigazione esistono molte equazioni ampiamente utilizzate per calcolare le perdite per attrito che si verificano nelle tubazioni. In generale si utilizzano frequentemente formule empiriche come quella di Hazen-Williams, che pu&#xF2; essere espressa come segue: (1) &nbsp; &nbsp; dove J &#xE8; la portata dell&#x2019;acqua, Q la portata[L3 T-&#xB9;] espresso in l/s,&hellip;</description></oembed>
