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<h1>Calculate initial predicted environmental concentrations in surface water due to drainage using the UK method</h1>
<div class="hidden name"><code>PEC_sw_drainage_UK.Rd</code></div>
</div>
<div class="ref-description">
<p>This implements the method specified in the UK data requirements handbook and was checked against the spreadsheet
published on the CRC website</p>
</div>
<pre class="usage"><span class='fu'>PEC_sw_drainage_UK</span>(<span class='no'>rate</span>, <span class='kw'>interception</span> <span class='kw'>=</span> <span class='fl'>0</span>, <span class='no'>Koc</span>,
<span class='kw'>latest_application</span> <span class='kw'>=</span> <span class='kw'>NULL</span>, <span class='kw'>soil_DT50</span> <span class='kw'>=</span> <span class='kw'>NULL</span>, <span class='kw'>model</span> <span class='kw'>=</span> <span class='kw'>NULL</span>,
<span class='kw'>model_parms</span> <span class='kw'>=</span> <span class='kw'>NULL</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 g/ha</p></td>
</tr>
<tr>
<th>interception</th>
<td><p>The fraction of the application rate that does not reach the soil</p></td>
</tr>
<tr>
<th>Koc</th>
<td><p>The sorption coefficient normalised to organic carbon in L/kg</p></td>
</tr>
<tr>
<th>latest_application</th>
<td><p>Latest application date, formatted as e.g. "01 July"</p></td>
</tr>
<tr>
<th>soil_DT50</th>
<td><p>Soil degradation half-life, if SFO kinetics are to be used</p></td>
</tr>
<tr>
<th>model</th>
<td><p>The soil degradation model to be used. Either one of "FOMC",
"DFOP", "HS", or "IORE", or an mkinmod object</p></td>
</tr>
<tr>
<th>model_parms</th>
<td><p>A named numeric vector containing the model parameters</p></td>
</tr>
</table>
<h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2>
<p>The predicted concentration in surface water in µg/L</p>
<h2 class="hasAnchor" id="references"><a class="anchor" href="#references"></a>References</h2>
<p>HSE's Chemicals Regulation Division (CRD) Active substance
PECsw calculations (for UK specific authorisation requests)
<a href='https://www.hse.gov.uk/pesticides/topics/pesticide-approvals/pesticides-registration/data-requirements-handbook/fate/active-substance-uk.htm'>https://www.hse.gov.uk/pesticides/topics/pesticide-approvals/pesticides-registration/data-requirements-handbook/fate/active-substance-uk.htm</a>
accessed 2019-09-27</p>
<p>Drainage PECs Version 1.0 (2015) Spreadsheet published at
<a href='https://www.hse.gov.uk/pesticides/topics/pesticide-approvals/pesticides-registration/data-requirements-handbook/fate/pec-tools-2015/PEC%20sw-sed%20(drainage).xlsx'>https://www.hse.gov.uk/pesticides/topics/pesticide-approvals/pesticides-registration/data-requirements-handbook/fate/pec-tools-2015/PEC%20sw-sed%20(drainage).xlsx</a>
accessed 2019-09-27</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_drainage_UK</span>(<span class='fl'>150</span>, <span class='kw'>Koc</span> <span class='kw'>=</span> <span class='fl'>100</span>)</div><div class='output co'>#> [1] 8.076923</div></pre>
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<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="#references">References</a></li>
<li><a href="#examples">Examples</a></li>
</ul>
<h2>Author</h2>
<p>Johannes Ranke</p>
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