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  <url><loc>https://pe-calc.com/about.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.5</priority></url>
  <url><loc>https://pe-calc.com/privacy.html</loc><lastmod>2026-04-28</lastmod><changefreq>yearly</changefreq><priority>0.2</priority></url>

  <!-- Hydraulics & Water Resources -->
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  <url><loc>https://pe-calc.com/tools/darcy-weisbach.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/hazen-williams.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/reynolds.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/sharp-crested-weir.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/broad-crested-weir.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/v-notch-weir.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/orifice.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/time-of-concentration.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/rational-method.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/scs-runoff.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/culvert.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/interpolator.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>

  <!-- Environmental -->
  <url><loc>https://pe-calc.com/tools/bod-removal.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/mlss-fm-ratio.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/aeration-tank.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/oxygen-transfer.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/settling-velocity.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/chlorine-disinfection.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/lift-station.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/hydraulic-detention-time.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>

  <!-- Geotech -->
  <url><loc>https://pe-calc.com/tools/bearing-capacity.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/lateral-earth-pressure.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/slope-stability.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/consolidation-settlement.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/pile-capacity.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>

  <!-- Structural -->
  <url><loc>https://pe-calc.com/tools/beam-deflection.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/euler-buckling.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/section-properties.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/aisc-allowable-stress.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/concrete-flexure.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>

  <!-- Transportation -->
  <url><loc>https://pe-calc.com/tools/stopping-sight-distance.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/vertical-curve.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/horizontal-curve.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/superelevation.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>

  <!-- Mechanical / HVAC -->
  <url><loc>https://pe-calc.com/tools/pump-bhp.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/fan-affinity.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/duct-pressure.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/lmtd.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/psychrometric.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>

  <!-- Electrical -->
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  <url><loc>https://pe-calc.com/tools/three-phase-power.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/motor-fla.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/transformer-sizing.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/conduit-fill.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>

  <!-- Chemical / Thermo -->
  <url><loc>https://pe-calc.com/tools/ideal-gas.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/antoine-vapor-pressure.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/reactor-sizing.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>
  <url><loc>https://pe-calc.com/tools/cop-refrigeration.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.9</priority></url>

  <!-- Cheat sheets -->
  <url><loc>https://pe-calc.com/cheat-sheets/mannings-n.html</loc><lastmod>2026-04-28</lastmod><changefreq>monthly</changefreq><priority>0.85</priority></url>
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