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<img src="" class="logo" alt=""><h1>Calculate PEC surface water due to runoff and erosion as in Exposit 3</h1>
<small class="dont-index">Source: <a href="https://github.com/jranke/pfm/blob/HEAD/R/PEC_sw_exposit_runoff.R" class="external-link"><code>R/PEC_sw_exposit_runoff.R</code></a></small>
<div class="d-none name"><code>PEC_sw_exposit_runoff.Rd</code></div>
</div>
<div class="ref-description section level2">
<p>This is a reimplementation of the calculation described in the Exposit 3.02 spreadsheet file,
in the worksheet "Konzept Runoff".</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_exposit_runoff</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> DT50 <span class="op">=</span> <span class="cn">Inf</span>,</span>
<span> t_runoff <span class="op">=</span> <span class="fl">3</span>,</span>
<span> exposit_reduction_version <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">"3.02"</span>, <span class="st">"3.01a"</span>, <span class="st">"3.01a2"</span>, <span class="st">"2.0"</span><span class="op">)</span>,</span>
<span> V_ditch <span class="op">=</span> <span class="fl">30</span>,</span>
<span> V_event <span class="op">=</span> <span class="fl">100</span>,</span>
<span> dilution <span class="op">=</span> <span class="fl">2</span></span>
<span><span class="op">)</span></span></code></pre></div>
</div>
<div class="section level2">
<h2 id="source">Source<a class="anchor" aria-label="anchor" href="#source"></a></h2>
<p>Excel 3.02 spreadsheet available from
<a href="https://www.bvl.bund.de/DE/04_Pflanzenschutzmittel/03_Antragsteller/04_Zulassungsverfahren/07_Naturhaushalt/psm_naturhaush_node.html#doc1400590bodyText3" class="external-link">https://www.bvl.bund.de/DE/04_Pflanzenschutzmittel/03_Antragsteller/04_Zulassungsverfahren/07_Naturhaushalt/psm_naturhaush_node.html#doc1400590bodyText3</a></p>
</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>The application rate in g/ha</p></dd>
<dt>interception</dt>
<dd><p>The fraction intercepted by the crop</p></dd>
<dt>Koc</dt>
<dd><p>The sorption coefficient to soil organic carbon</p></dd>
<dt>DT50</dt>
<dd><p>The soil half-life in days</p></dd>
<dt>t_runoff</dt>
<dd><p>The time between application and the runoff event, where degradation occurs, in days</p></dd>
<dt>exposit_reduction_version</dt>
<dd><p>The version of the reduction factors to be used. "3.02" is the current
version used in Germany, "3.01a" is the version with additional percentages for 3 m and 6 m buffer
zones used in Switzerland. "3.01a2" is a version introduced for consistency with previous calculations
performed for a 3 m buffer zone in Switzerland, with the same reduction being applied to the dissolved
and the bound fraction.</p></dd>
<dt>V_ditch</dt>
<dd><p>The volume of the ditch is assumed to be 1 m * 100 m * 30 cm = 30 m3</p></dd>
<dt>V_event</dt>
<dd><p>The unreduced runoff volume, equivalent to 10 mm precipitation on 1 ha</p></dd>
<dt>dilution</dt>
<dd><p>The dilution factor</p></dd>
</dl></div>
<div class="section level2">
<h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2>
<p>A list containing the following components</p>
<p></p>
<dl><dt>perc_runoff</dt>
<dd><p>The runoff percentages for dissolved and bound substance</p></dd>
<dt>runoff</dt>
<dd><p>A matrix containing dissolved and bound input for the different distances</p></dd>
<dt>PEC_sw_runoff</dt>
<dd><p>A matrix containing PEC values for dissolved and bound substance
for the different distances. If the rate was given in g/ha, the PECsw are in microg/L.</p></dd>
</dl></div>
<div class="section level2">
<h2 id="see-also">See also<a class="anchor" aria-label="anchor" href="#see-also"></a></h2>
<div class="dont-index"><p><code><a href="perc_runoff_exposit.html">perc_runoff_exposit</a></code> for runoff loss percentages and <code><a href="perc_runoff_reduction_exposit.html">perc_runoff_reduction_exposit</a></code> for runoff reduction percentages used</p></div>
</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_exposit_runoff</span><span class="op">(</span><span class="fl">500</span>, Koc <span class="op">=</span> <span class="fl">150</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#></span> $perc_runoff</span>
<span class="r-out co"><span class="r-pr">#></span> dissolved bound </span>
<span class="r-out co"><span class="r-pr">#></span> 0.248 0.001 </span>
<span class="r-out co"><span class="r-pr">#></span> </span>
<span class="r-out co"><span class="r-pr">#></span> $runoff</span>
<span class="r-out co"><span class="r-pr">#></span> dissolved bound total</span>
<span class="r-out co"><span class="r-pr">#></span> No buffer 1.240 0.00500 1.24500</span>
<span class="r-out co"><span class="r-pr">#></span> 5 m 0.744 0.00300 0.74700</span>
<span class="r-out co"><span class="r-pr">#></span> 10 m 0.496 0.00075 0.49675</span>
<span class="r-out co"><span class="r-pr">#></span> 20 m 0.248 0.00025 0.24825</span>
<span class="r-out co"><span class="r-pr">#></span> </span>
<span class="r-out co"><span class="r-pr">#></span> $PEC_sw_runoff</span>
<span class="r-out co"><span class="r-pr">#></span> dissolved bound total</span>
<span class="r-out co"><span class="r-pr">#></span> No buffer 4.769231 0.019230769 4.788462</span>
<span class="r-out co"><span class="r-pr">#></span> 5 m 4.133333 0.016666667 4.150000</span>
<span class="r-out co"><span class="r-pr">#></span> 10 m 3.542857 0.005357143 3.548214</span>
<span class="r-out co"><span class="r-pr">#></span> 20 m 2.480000 0.002500000 2.482500</span>
<span class="r-out co"><span class="r-pr">#></span> </span>
<span class="r-in"><span> <span class="fu">PEC_sw_exposit_runoff</span><span class="op">(</span><span class="fl">600</span>, Koc <span class="op">=</span> <span class="fl">10000</span>, DT50 <span class="op">=</span> <span class="fl">195</span>, exposit <span class="op">=</span> <span class="st">"3.01a"</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#></span> $perc_runoff</span>
<span class="r-out co"><span class="r-pr">#></span> dissolved bound </span>
<span class="r-out co"><span class="r-pr">#></span> 0.037 0.159 </span>
<span class="r-out co"><span class="r-pr">#></span> </span>
<span class="r-out co"><span class="r-pr">#></span> $runoff</span>
<span class="r-out co"><span class="r-pr">#></span> dissolved bound total</span>
<span class="r-out co"><span class="r-pr">#></span> No buffer 0.21964521 0.94388078 1.16352600</span>
<span class="r-out co"><span class="r-pr">#></span> 3 m 0.16473391 0.66071655 0.82545046</span>
<span class="r-out co"><span class="r-pr">#></span> 5 m 0.13178713 0.56632847 0.69811560</span>
<span class="r-out co"><span class="r-pr">#></span> 6 m 0.12080487 0.42474635 0.54555122</span>
<span class="r-out co"><span class="r-pr">#></span> 10 m 0.08785809 0.14158212 0.22944020</span>
<span class="r-out co"><span class="r-pr">#></span> 20 m 0.04392904 0.04719404 0.09112308</span>
<span class="r-out co"><span class="r-pr">#></span> </span>
<span class="r-out co"><span class="r-pr">#></span> $PEC_sw_runoff</span>
<span class="r-out co"><span class="r-pr">#></span> dissolved bound total</span>
<span class="r-out co"><span class="r-pr">#></span> No buffer 0.8447893 3.6303107 4.4751000</span>
<span class="r-out co"><span class="r-pr">#></span> 3 m 0.7844472 3.1462693 3.9307165</span>
<span class="r-out co"><span class="r-pr">#></span> 5 m 0.7321507 3.1462693 3.8784200</span>
<span class="r-out co"><span class="r-pr">#></span> 6 m 0.7106169 2.4985080 3.2091248</span>
<span class="r-out co"><span class="r-pr">#></span> 10 m 0.6275578 1.0113008 1.6388586</span>
<span class="r-out co"><span class="r-pr">#></span> 20 m 0.4392904 0.4719404 0.9112308</span>
<span class="r-out co"><span class="r-pr">#></span> </span>
</code></pre></div>
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