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published on the CRC website. Degradation between the end (30 April) and the start (1 October) of
the drainage period is taken into account if
latest_application is specified and the degradation parameters are given either as a soil_DT50 or a model."><meta property="og:description" content="This implements the method specified in the UK data requirements handbook and was checked against the spreadsheet
published on the CRC website. Degradation between the end (30 April) and the start (1 October) of
the drainage period is taken into account if
latest_application is specified and the degradation parameters are given either as a soil_DT50 or a model."></head><body>
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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. Degradation between the end (30 April) and the start (1 October) of
the drainage period is taken into account if
<code>latest_application</code> is specified and the degradation parameters are given either as a <code>soil_DT50</code> or a <code>model</code>.</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>
<span></span>
<span><span class="fu">drainage_date_UK</span><span class="op">(</span><span class="va">application_date</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 or with a compatible unit specified
with the units package</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 or a unit specified
with the units package</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, in
days or a time unit specified with the units package</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>
<dt id="arg-application-date">application_date<a class="anchor" aria-label="anchor" href="#arg-application-date"></a></dt>
<dd><p>Application date</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/data-requirements-handbook/fate/pecsw-sed-via-drainflow.htm" class="external-link">https://www.hse.gov.uk/pesticides/data-requirements-handbook/fate/pecsw-sed-via-drainflow.htm</a>
accessed 2026-02-13</p>
<p>PECsw/sed spray drift and tier 1 drainflow calculator Version 2.1.1 (2025) Spreadsheet published at
<a href="https://www.hse.gov.uk/pesticides/assets/docs/PEC%20sw-sed%20(spraydrift).xlsx)" class="external-link">https://www.hse.gov.uk/pesticides/assets/docs/PEC%20sw-sed%20(spraydrift).xlsx)</a>
accessed 2026-02-13</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> 8.076923 [µg/L]</span>
<span class="r-in"><span><span class="fu">PEC_sw_drainage_UK</span><span class="op">(</span><span class="fl">60</span>, interception <span class="op">=</span> <span class="fl">0.5</span>, Koc <span class="op">=</span> <span class="fl">550</span>,</span></span>
<span class="r-in"><span> latest_application <span class="op">=</span> <span class="st">"01 July"</span>, soil_DT50 <span class="op">=</span> <span class="fl">200</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#></span> 0.8388303 [µg/L]</span>
<span class="r-in"><span><span class="fu">drainage_date_UK</span><span class="op">(</span><span class="st">"2023-07-10"</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#></span> [1] "2023-10-01"</span>
<span class="r-in"><span><span class="fu">drainage_date_UK</span><span class="op">(</span><span class="st">"2020-12-01"</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#></span> [1] "2020-12-01"</span>
<span class="r-in"><span><span class="fu">drainage_date_UK</span><span class="op">(</span><span class="fu"><a href="https://rdrr.io/r/base/as.Date.html" class="external-link">as.Date</a></span><span class="op">(</span><span class="st">"2022-01-15"</span><span class="op">)</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#></span> [1] "2022-01-15"</span>
</code></pre></div>
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