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</style>
</head>
<body>
<header>
<div class="hdr-outer">
<div class="hdr-title">
<div class="hdr-title-text">
<h1>Kansas ET₀ Reference Tables</h1>
<div class="hdr-sub">Typical 7-day cumulative reference evapotranspiration by county</div>
</div>
<div class="hdr-date">
Today
<strong id="today-date">—</strong>
</div>
</div>
<div class="hdr-controls">
<select id="county-sel"><option disabled selected>Loading…</option></select>
</div>
</div>
</header>
<main>
<div class="main-inner">
<!-- Hero + Summary -->
<div class="info-row">
<div class="hero-card">
<div class="hero-label">Today</div>
<div class="hero-val" id="hero-val">—</div>
<div class="hero-unit">in/week</div>
<div class="hero-peak">
<div class="hero-peak-track">
<div class="hero-peak-fill" id="hero-peak-fill" style="width:0%"></div>
</div>
<div class="hero-peak-pct" id="hero-peak-pct">—</div>
</div>
</div>
<div class="summary" id="summary"></div>
</div>
<div class="img-wrap">
<input type="checkbox" id="img-toggle" class="img-toggle-input">
<div class="img-head">
<label for="img-toggle" class="img-head-label">7‑Day ET₀ Table</label>
<div class="dl-btns">
<a id="btn-jpg" class="dl-btn" href="#" download>⬇JPG</a>
<a id="btn-pdf" class="dl-btn" href="#" download>⬇PDF</a>
</div>
</div>
<div class="img-body">
<img id="county-img" alt="County ET table">
<div class="img-error" id="img-error">// NO IMAGE FOUND FOR THIS COUNTY</div>
</div>
</div>
<!-- Calculator -->
<div class="calc">
<div class="calc-head">
<div class="calc-label">Crop Water Use Calculator</div>
<div class="calc-formula">ET<sub>c</sub> = K<sub>c</sub> × ET₀</div>
</div>
<div class="calc-row">
<label class="calc-field">
<span class="calc-field-label">K<sub>c</sub></span>
<input id="kc-in" type="number" inputmode="decimal"
step="0.05" min="0" max="2" aria-label="Crop coefficient"
placeholder="Enter value">
</label>
<span class="calc-op">×</span>
<label class="calc-field">
<span class="calc-field-label">ET₀ (in/week)</span>
<input id="eto-in" type="number" inputmode="decimal"
step="0.01" min="0" max="3" aria-label="Reference ET">
</label>
<span class="calc-op">=</span>
<div class="calc-result" id="result-wrap">
<span class="calc-field-label">ET<sub>c</sub> (in/week)</span>
<span class="calc-result-value" id="result">—</span>
</div>
</div>
<div class="calc-hint">
ET₀ is pre-filled with today’s typical value for the selected county.
Enter your crop’s K<sub>c</sub> — or click a value from the table below.
</div>
</div>
<!-- Kc reference table -->
<div class="kc-box">
<div class="kc-box-label">Crop Coefficient Reference</div>
<p>
K<sub>c</sub> changes through the season, use the stage that best
matches your crop’s current development. Click any value to load it
into the calculator.
</p>
<div class="kc-table-wrap">
<table class="kc-table">
<thead>
<tr>
<th>Crop</th>
<th>Initial</th>
<th>Development</th>
<th>Mid-season<br><span style="font-weight:400;opacity:.7">(peak demand)</span></th>
<th>Late season</th>
</tr>
</thead>
<tbody>
<tr><td>Winter Wheat</td> <td>0.30</td><td>0.70</td><td>1.15</td><td>0.40</td></tr>
<tr><td>Corn</td> <td>0.30</td><td>0.75</td><td>1.20</td><td>0.60</td></tr>
<tr><td>Soybean</td> <td>0.40</td><td>0.80</td><td>1.15</td><td>0.50</td></tr>
<tr><td>Grain Sorghum</td> <td>0.30</td><td>0.70</td><td>1.05</td><td>0.55</td></tr>
<tr><td>Sunflower</td> <td>0.35</td><td>0.75</td><td>1.10</td><td>0.35</td></tr>
<tr><td>Alfalfa</td> <td>0.40</td><td>0.95</td><td>1.20</td><td>1.15</td></tr>
</tbody>
</table>
</div>
<p class="kc-source" style="font-size:.6rem">
Source: FAO Irrigation & Drainage Paper No. 56 (Allen et al., 1998).
Values are approximations.
</p>
</div>
</div>
</main>
<footer>
Soil Water Processes Lab · Agronomy · Kansas State University · Climate: GRIDMET
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