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EPANET/doc/html/_units.html
Demetrios G. Eliades c16c861789 HTML Users Guide
2019-11-21 16:58:18 +02:00

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&#160;<span id="projectnumber">2.2.0</span>
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<div class="title">Measurement Units </div> </div>
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<div class="textblock"><p>The toolkit can use data expressed in either US Customary of SI Metric units. A project's unit system depends on the unit system used for its choice of flow units. If the EN_open function is used to supply data to a project from an Input File then its flow units are set in the <a class="el" href="_options_page.html">[OPTIONS]</a> section of the file. If the EN_init function is used to initialize a project then the choice of flow units is the fourth argument to the function. The following table lists the units used to express the various parameters in an EPANET model.</p>
<table class="markdownTable">
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<th class="markdownTableHeadNone">Parameter </th><th class="markdownTableHeadNone">US Customary </th><th class="markdownTableHeadNone">SI Metric </th></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Concentration </td><td class="markdownTableBodyNone">mg/L or ug/L </td><td class="markdownTableBodyNone">mg/L or ug/L </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone">Demand </td><td class="markdownTableBodyNone">(see Flow units) </td><td class="markdownTableBodyNone">(see Flow units) </td></tr>
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<td class="markdownTableBodyNone">Diameter (Pipes) </td><td class="markdownTableBodyNone">inches </td><td class="markdownTableBodyNone">millimeters </td></tr>
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<td class="markdownTableBodyNone">Diameter (Tanks) </td><td class="markdownTableBodyNone">feet </td><td class="markdownTableBodyNone">meters </td></tr>
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<td class="markdownTableBodyNone">Efficiency </td><td class="markdownTableBodyNone">percent </td><td class="markdownTableBodyNone">percent </td></tr>
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<td class="markdownTableBodyNone">Elevation </td><td class="markdownTableBodyNone">feet </td><td class="markdownTableBodyNone">meters </td></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Emitter Coeff. </td><td class="markdownTableBodyNone">flow units @ 1 psi drop </td><td class="markdownTableBodyNone">flow units @ 1 meter drop </td></tr>
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<td class="markdownTableBodyNone">Energy </td><td class="markdownTableBodyNone">kwatt - hours </td><td class="markdownTableBodyNone">kwatt - hours </td></tr>
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<td class="markdownTableBodyNone">Flow </td><td class="markdownTableBodyNone">CFS (cubic feet / sec) </td><td class="markdownTableBodyNone">LPS (liters / sec) </td></tr>
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<td class="markdownTableBodyNone"></td><td class="markdownTableBodyNone">GPM (gallons / min) </td><td class="markdownTableBodyNone">LPM (liters / min) </td></tr>
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<td class="markdownTableBodyNone"></td><td class="markdownTableBodyNone">MGD (million gal / day) </td><td class="markdownTableBodyNone">MLD (megaliters / day) </td></tr>
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<td class="markdownTableBodyNone"></td><td class="markdownTableBodyNone">IMGD (Imperial MGD) </td><td class="markdownTableBodyNone">CMH (cubic meters / hr) </td></tr>
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<td class="markdownTableBodyNone"></td><td class="markdownTableBodyNone">AFD (acre-feet / day) </td><td class="markdownTableBodyNone">CMD (cubic meters / day) </td></tr>
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<td class="markdownTableBodyNone">Friction Factor </td><td class="markdownTableBodyNone">unitless </td><td class="markdownTableBodyNone">unitless </td></tr>
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<td class="markdownTableBodyNone">Head </td><td class="markdownTableBodyNone">feet </td><td class="markdownTableBodyNone">meters </td></tr>
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<td class="markdownTableBodyNone">Length </td><td class="markdownTableBodyNone">feet </td><td class="markdownTableBodyNone">meters </td></tr>
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<td class="markdownTableBodyNone">Minor Loss Coeff. </td><td class="markdownTableBodyNone">unitless </td><td class="markdownTableBodyNone">unitless </td></tr>
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<td class="markdownTableBodyNone">Power </td><td class="markdownTableBodyNone">horsepower </td><td class="markdownTableBodyNone">kwatts </td></tr>
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<td class="markdownTableBodyNone">Pressure </td><td class="markdownTableBodyNone">psi </td><td class="markdownTableBodyNone">meters </td></tr>
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<td class="markdownTableBodyNone">Reaction Coeff. (Bulk) </td><td class="markdownTableBodyNone">1/day (1st-order) </td><td class="markdownTableBodyNone">1/day (1st-order) </td></tr>
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<td class="markdownTableBodyNone">Reaction Coeff. (Wall) </td><td class="markdownTableBodyNone">mass/sq-ft/day (0-order) </td><td class="markdownTableBodyNone">mass/sq-m/day (0-order) </td></tr>
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<td class="markdownTableBodyNone"></td><td class="markdownTableBodyNone">ft/day (1st-order) </td><td class="markdownTableBodyNone">meters/day (1st-order) </td></tr>
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<td class="markdownTableBodyNone">Roughness Coeff. </td><td class="markdownTableBodyNone">millifeet (Darcy-Weisbach) unitless otherwise </td><td class="markdownTableBodyNone">mm (Darcy-Weisbach) unitless otherwise </td></tr>
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<td class="markdownTableBodyNone">Source Mass Injection </td><td class="markdownTableBodyNone">mass/minute </td><td class="markdownTableBodyNone">mass/minute </td></tr>
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<td class="markdownTableBodyNone">Velocity </td><td class="markdownTableBodyNone">ft/sec </td><td class="markdownTableBodyNone">meters/sec </td></tr>
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<td class="markdownTableBodyNone">Volume </td><td class="markdownTableBodyNone">cubic feet </td><td class="markdownTableBodyNone">cubic meters </td></tr>
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<td class="markdownTableBodyNone">Water Age </td><td class="markdownTableBodyNone">hours </td><td class="markdownTableBodyNone">hours </td></tr>
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