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<img src="" class="logo" alt=""><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/HEAD/R/PEC_sw_drift.R" class="external-link"><code>R/PEC_sw_drift.R</code></a></small>
<div class="d-none name"><code>PEC_sw_drift.Rd</code></div>
</div>
<div class="ref-description section level2">
<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>
<div class="section level2">
<h2 id="ref-usage">Usage<a class="anchor" aria-label="anchor" href="#ref-usage"></a></h2>
<div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">PEC_sw_drift</span><span class="op">(</span></span>
<span> <span class="va">rate</span>,</span>
<span> applications <span class="op">=</span> <span class="fl">1</span>,</span>
<span> water_depth <span class="op">=</span> <span class="fl">30</span>,</span>
<span> drift_percentages <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span> drift_data <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"JKI"</span>, <span class="st">"RF"</span><span class="op">)</span>,</span>
<span> crop <span class="op">=</span> <span class="st">"Ackerbau"</span>,</span>
<span> distances <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="fl">1</span>, <span class="fl">5</span>, <span class="fl">10</span>, <span class="fl">20</span><span class="op">)</span>,</span>
<span> rate_units <span class="op">=</span> <span class="st">"g/ha"</span>,</span>
<span> PEC_units <span class="op">=</span> <span class="st">"µg/L"</span></span>
<span><span class="op">)</span></span></code></pre></div>
</div>
<div class="section level2">
<h2 id="arguments">Arguments<a class="anchor" aria-label="anchor" href="#arguments"></a></h2>
<dl><dt>rate</dt>
<dd><p>Application rate in units specified below</p></dd>
<dt>applications</dt>
<dd><p>Number of applications for selection of drift percentile</p></dd>
<dt>water_depth</dt>
<dd><p>Depth of the water body in cm</p></dd>
<dt>drift_percentages</dt>
<dd><p>Percentage drift values for which to calculate PECsw.
'drift_data' and 'distances' if not NULL.</p></dd>
<dt>drift_data</dt>
<dd><p>Source of drift percentage data. If 'JKI', the <a href="drift_data_JKI.html">drift_data_JKI</a>
included in the package is used. If 'RF', the Rautmann formula is used, if
implemented for the crop type and number of applications</p></dd>
<dt>crop</dt>
<dd><p>Crop name (use German names for JKI data), defaults to "Ackerbau"</p></dd>
<dt>distances</dt>
<dd><p>The distances in m for which to get PEC values</p></dd>
<dt>rate_units</dt>
<dd><p>Defaults to g/ha</p></dd>
<dt>PEC_units</dt>
<dd><p>Requested units for the calculated PEC. Only µg/L currently supported</p></dd>
</dl></div>
<div class="section level2">
<h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2>
<p>The predicted concentration in surface water</p>
</div>
<div class="section level2">
<h2 id="author">Author<a class="anchor" aria-label="anchor" href="#author"></a></h2>
<p>Johannes Ranke</p>
</div>
<div class="section level2">
<h2 id="ref-examples">Examples<a class="anchor" aria-label="anchor" href="#ref-examples"></a></h2>
<div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span><span class="fu">PEC_sw_drift</span><span class="op">(</span><span class="fl">100</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#></span> 1 m 5 m 10 m 20 m </span>
<span class="r-out co"><span class="r-pr">#></span> 0.92333333 0.19000000 0.09666667 0.05000000 </span>
<span class="r-in"><span><span class="co"># Alternatively, we can use the formula for a single application to "Ackerbau" from the paper</span></span></span>
<span class="r-in"><span><span class="fu">PEC_sw_drift</span><span class="op">(</span><span class="fl">100</span>, drift_data <span class="op">=</span> <span class="st">"RF"</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#></span> 1 m 5 m 10 m 20 m </span>
<span class="r-out co"><span class="r-pr">#></span> 0.92350000 0.19114149 0.09699222 0.04921742 </span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># This makes it possible to also use different substances</span></span></span>
<span class="r-in"><span><span class="fu">PEC_sw_drift</span><span class="op">(</span><span class="fl">100</span>, distances <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</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="op">)</span>, drift_data <span class="op">=</span> <span class="st">"RF"</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#></span> 1 m 3 m 5 m 6 m 10 m 20 m 50 m </span>
<span class="r-out co"><span class="r-pr">#></span> 0.92350000 0.31512171 0.19114149 0.15990435 0.09699222 0.04921742 0.02007497 </span>
<span class="r-out co"><span class="r-pr">#></span> 100 m </span>
<span class="r-out co"><span class="r-pr">#></span> 0.01018678 </span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># Using custom drift percentages is also supported</span></span></span>
<span class="r-in"><span><span class="fu">PEC_sw_drift</span><span class="op">(</span><span class="fl">100</span>, drift_percentages <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</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><span class="op">)</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#></span> 2.77 % 0.95 % 0.57 % 0.48 % 0.29 % 0.15 % 0.06 % </span>
<span class="r-out co"><span class="r-pr">#></span> 0.92333333 0.31666667 0.19000000 0.16000000 0.09666667 0.05000000 0.02000000 </span>
<span class="r-out co"><span class="r-pr">#></span> 0.03 % </span>
<span class="r-out co"><span class="r-pr">#></span> 0.01000000 </span>
</code></pre></div>
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