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<h1>Calculate initial predicted environmental concentrations in surface water due to drainage using the UK method</h1>
<small class="dont-index">Source: <a href="https://github.com/jranke/pfm/blob/HEAD/R/PEC_sw_drainage_UK.R" class="external-link"><code>R/PEC_sw_drainage_UK.R</code></a></small>
<div class="d-none name"><code>PEC_sw_drainage_UK.Rd</code></div>
</div>
<div class="ref-description section level2">
<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>
<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_drainage_UK</span><span class="op">(</span></span>
<span> <span class="va">rate</span>,</span>
<span> interception <span class="op">=</span> <span class="fl">0</span>,</span>
<span> <span class="va">Koc</span>,</span>
<span> latest_application <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span> soil_DT50 <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span> model <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span> model_parms <span class="op">=</span> <span class="cn">NULL</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 id="arg-rate">rate<a class="anchor" aria-label="anchor" href="#arg-rate"></a></dt>
<dd><p>Application rate in g/ha</p></dd>
<dt id="arg-interception">interception<a class="anchor" aria-label="anchor" href="#arg-interception"></a></dt>
<dd><p>The fraction of the application rate that does not reach the soil</p></dd>
<dt id="arg-koc">Koc<a class="anchor" aria-label="anchor" href="#arg-koc"></a></dt>
<dd><p>The sorption coefficient normalised to organic carbon in L/kg</p></dd>
<dt id="arg-latest-application">latest_application<a class="anchor" aria-label="anchor" href="#arg-latest-application"></a></dt>
<dd><p>Latest application date, formatted as e.g. "01 July"</p></dd>
<dt id="arg-soil-dt-">soil_DT50<a class="anchor" aria-label="anchor" href="#arg-soil-dt-"></a></dt>
<dd><p>Soil degradation half-life, if SFO kinetics are to be used</p></dd>
<dt id="arg-model">model<a class="anchor" aria-label="anchor" href="#arg-model"></a></dt>
<dd><p>The soil degradation model to be used. Either one of "FOMC",
"DFOP", "HS", or "IORE", or an mkinmod object</p></dd>
<dt id="arg-model-parms">model_parms<a class="anchor" aria-label="anchor" href="#arg-model-parms"></a></dt>
<dd><p>A named numeric vector containing the model parameters</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 in µg/L</p>
</div>
<div class="section level2">
<h2 id="references">References<a class="anchor" aria-label="anchor" href="#references"></a></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" class="external-link">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" class="external-link">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>
</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_drainage_UK</span><span class="op">(</span><span class="fl">150</span>, Koc <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] 8.076923</span>
</code></pre></div>
</div>
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