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    <h1>Calculate predicted environmental concentrations in surface water due to drift</h1>
    <small class="dont-index">Source: <a href='https://github.com/jranke/pfm/blob/master/R/PEC_sw_drift.R'><code>R/PEC_sw_drift.R</code></a></small>
    <div class="hidden name"><code>PEC_sw_drift.Rd</code></div>
    </div>

    <div class="ref-description">
    
    <p>This is a basic, vectorised form of a simple calculation of a contaminant
concentration in surface water based on complete, instantaneous mixing
with input via spray drift.</p>
    
    </div>

    <pre class="usage"><span class='fu'>PEC_sw_drift</span>(<span class='no'>rate</span>, <span class='kw'>applications</span> <span class='kw'>=</span> <span class='fl'>1</span>, <span class='kw'>water_depth</span> <span class='kw'>=</span> <span class='fl'>30</span>,
  <span class='kw'>drift_percentages</span> <span class='kw'>=</span> <span class='kw'>NULL</span>, <span class='kw'>drift_data</span> <span class='kw'>=</span> <span class='st'>"JKI"</span>, <span class='kw'>crop</span> <span class='kw'>=</span> <span class='st'>"Ackerbau"</span>,
  <span class='kw'>distances</span> <span class='kw'>=</span> <span class='fu'>c</span>(<span class='fl'>1</span>, <span class='fl'>5</span>, <span class='fl'>10</span>, <span class='fl'>20</span>), <span class='kw'>rate_units</span> <span class='kw'>=</span> <span class='st'>"g/ha"</span>, <span class='kw'>PEC_units</span> <span class='kw'>=</span> <span class='st'>"µg/L"</span>)</pre>
    
    <h2 class="hasAnchor" id="arguments"><a class="anchor" href="#arguments"></a>Arguments</h2>
    <table class="ref-arguments">
    <colgroup><col class="name" /><col class="desc" /></colgroup>
    <tr>
      <th>rate</th>
      <td><p>Application rate in units specified below</p></td>
    </tr>
    <tr>
      <th>applications</th>
      <td><p>Number of applications for selection of drift percentile</p></td>
    </tr>
    <tr>
      <th>water_depth</th>
      <td><p>Depth of the water body in cm</p></td>
    </tr>
    <tr>
      <th>drift_percentages</th>
      <td><p>Percentage drift values for which to calculate PECsw.
'drift_data' and 'distances' if not NULL.</p></td>
    </tr>
    <tr>
      <th>drift_data</th>
      <td><p>Source of drift percentage data</p></td>
    </tr>
    <tr>
      <th>crop</th>
      <td><p>Crop name (use German names for JKI data), defaults to "Ackerbau"</p></td>
    </tr>
    <tr>
      <th>distances</th>
      <td><p>The distances in m for which to get PEC values</p></td>
    </tr>
    <tr>
      <th>rate_units</th>
      <td><p>Defaults to g/ha</p></td>
    </tr>
    <tr>
      <th>PEC_units</th>
      <td><p>Requested units for the calculated PEC. Only µg/L currently supported</p></td>
    </tr>
    </table>
    
    <h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2>

    <p>The predicted concentration in surface water</p>
    

    <h2 class="hasAnchor" id="examples"><a class="anchor" href="#examples"></a>Examples</h2>
    <pre class="examples"><div class='input'><span class='fu'>PEC_sw_drift</span>(<span class='fl'>100</span>)</div><div class='output co'>#&gt;        1 m        5 m       10 m       20 m 
#&gt; 0.92333333 0.19000000 0.09666667 0.05000000 </div></pre>
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    <h2>Contents</h2>
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      <li><a href="#arguments">Arguments</a></li>
      
      <li><a href="#value">Value</a></li>
      
      <li><a href="#examples">Examples</a></li>
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    <h2>Author</h2>
    
Johannes Ranke

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