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+ <h1>Calculate predicted environmental concentrations in surface water due to drift</h1>
+ </div>
+
+
+ <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>
+
+
+ <pre><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>
+ <dl class="dl-horizontal">
+ <dt>rate</dt>
+ <dd>Application rate in units specified below</dd>
+ <dt>applications</dt>
+ <dd>Number of applications for selection of drift percentile</dd>
+ <dt>water_depth</dt>
+ <dd>Depth of the water body in cm</dd>
+ <dt>drift_percentages</dt>
+ <dd>Percentage drift values for which to calculate PECsw.
+&#39;drift_data&#39; and &#39;distances&#39; if not NULL.</dd>
+ <dt>drift_data</dt>
+ <dd>Source of drift percentage data</dd>
+ <dt>crop</dt>
+ <dd>Crop name (use German names for JKI data), defaults to &quot;Ackerbau&quot;</dd>
+ <dt>distances</dt>
+ <dd>The distances in m for which to get PEC values</dd>
+ <dt>rate_units</dt>
+ <dd>Defaults to g/ha</dd>
+ <dt>PEC_units</dt>
+ <dd>Requested units for the calculated PEC. Only µg/L currently supported</dd>
+ </dl>
+
+ <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>
+ </div>
+ <div class="col-md-3 hidden-xs hidden-sm" id="sidebar">
+ <h2>Contents</h2>
+ <ul class="nav nav-pills nav-stacked">
+ <li><a href="#arguments">Arguments</a></li>
+
+ <li><a href="#value">Value</a></li>
+
+ <li><a href="#examples">Examples</a></li>
+ </ul>
+
+ <h2>Author</h2>
+
+Johannes Ranke
+
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