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<h1>Calculate predicted environmental concentrations in surface water due to drift</h1>
<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='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='st'>"JKI"</span>, <span class='st'>"RF"</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'><a href='https://rdrr.io/r/base/c.html'>c</a></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. If 'JKI', the [drift_data_JKI]
included in the package is used. If 'RF', the Rautmann formula is used, if
implemented for the crop type and number of applications</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'>#> 1 m 5 m 10 m 20 m
#> 0.92333333 0.19000000 0.09666667 0.05000000 </div><div class='input'><span class='co'># Alternatively, we can use the formula for a single application to "Ackerbau" from the paper</span>
<span class='fu'>PEC_sw_drift</span>(<span class='fl'>100</span>, <span class='kw'>drift_data</span> <span class='kw'>=</span> <span class='st'>"RF"</span>)</div><div class='output co'>#> 1 m 5 m 10 m 20 m
#> 0.92350000 0.19114149 0.09699222 0.04921742 </div><div class='input'>
<span class='co'># This makes it possible to also use different substances</span>
<span class='fu'>PEC_sw_drift</span>(<span class='fl'>100</span>, <span class='kw'>distances</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='fl'>1</span>, <span class='fl'>3</span>, <span class='fl'>5</span>, <span class='fl'>6</span>, <span class='fl'>10</span>, <span class='fl'>20</span>, <span class='fl'>50</span>, <span class='fl'>100</span>), <span class='kw'>drift_data</span> <span class='kw'>=</span> <span class='st'>"RF"</span>)</div><div class='output co'>#> 1 m 3 m 5 m 6 m 10 m 20 m 50 m
#> 0.92350000 0.31512171 0.19114149 0.15990435 0.09699222 0.04921742 0.02007497
#> 100 m
#> 0.01018678 </div><div class='input'>
<span class='co'># Using custom drift percentages is also supported</span>
<span class='fu'>PEC_sw_drift</span>(<span class='fl'>100</span>, <span class='kw'>drift_percentages</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='fl'>2.77</span>, <span class='fl'>0.95</span>, <span class='fl'>0.57</span>, <span class='fl'>0.48</span>, <span class='fl'>0.29</span>, <span class='fl'>0.15</span>, <span class='fl'>0.06</span>, <span class='fl'>0.03</span>))</div><div class='output co'>#> 2.77 % 0.95 % 0.57 % 0.48 % 0.29 % 0.15 % 0.06 %
#> 0.92333333 0.31666667 0.19000000 0.16000000 0.09666667 0.05000000 0.02000000
#> 0.03 %
#> 0.01000000 </div></pre>
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