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<h1>Calculate PEC surface water due to runoff and erosion as in Exposit 3</h1>
<div class="hidden name"><code>PEC_sw_exposit_runoff.Rd</code></div>
</div>
<div class="ref-description">
<p>This is a reimplementation of the calculation described in the Exposit 3.02 spreadsheet file,
in the worksheet "Konzept Runoff".</p>
</div>
<pre class="usage"><span class='fu'>PEC_sw_exposit_runoff</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'>DT50</span> <span class='kw'>=</span> <span class='fl'>Inf</span>,
<span class='kw'>t_runoff</span> <span class='kw'>=</span> <span class='fl'>3</span>,
<span class='kw'>exposit_reduction_version</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></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='kw'>V_ditch</span> <span class='kw'>=</span> <span class='fl'>30</span>,
<span class='kw'>V_event</span> <span class='kw'>=</span> <span class='fl'>100</span>,
<span class='kw'>dilution</span> <span class='kw'>=</span> <span class='fl'>2</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>The application rate in g/ha</p></td>
</tr>
<tr>
<th>interception</th>
<td><p>The fraction intercepted by the crop</p></td>
</tr>
<tr>
<th>Koc</th>
<td><p>The sorption coefficient to soil organic carbon</p></td>
</tr>
<tr>
<th>DT50</th>
<td><p>The soil half-life in days</p></td>
</tr>
<tr>
<th>t_runoff</th>
<td><p>The time between application and the runoff event, where degradation occurs, in days</p></td>
</tr>
<tr>
<th>exposit_reduction_version</th>
<td><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></td>
</tr>
<tr>
<th>V_ditch</th>
<td><p>The volume of the ditch is assumed to be 1 m * 100 m * 30 cm = 30 m3</p></td>
</tr>
<tr>
<th>V_event</th>
<td><p>The unreduced runoff volume, equivalent to 10 mm precipitation on 1 ha</p></td>
</tr>
<tr>
<th>dilution</th>
<td><p>The dilution factor</p></td>
</tr>
</table>
<h2 class="hasAnchor" id="source"><a class="anchor" href="#source"></a>Source</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'>https://www.bvl.bund.de/DE/04_Pflanzenschutzmittel/03_Antragsteller/04_Zulassungsverfahren/07_Naturhaushalt/psm_naturhaush_node.html#doc1400590bodyText3</a></p>
<h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2>
<p>A list containing the following components</p><dl class='dl-horizontal'>
<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>
<h2 class="hasAnchor" id="see-also"><a class="anchor" href="#see-also"></a>See also</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>
<h2 class="hasAnchor" id="examples"><a class="anchor" href="#examples"></a>Examples</h2>
<pre class="examples"><div class='input'> <span class='fu'>PEC_sw_exposit_runoff</span>(<span class='fl'>500</span>, <span class='kw'>Koc</span> <span class='kw'>=</span> <span class='fl'>150</span>)</div><div class='output co'>#> $perc_runoff
#> dissolved bound
#> 0.248 0.001
#>
#> $runoff
#> dissolved bound total
#> No buffer 1.240 0.00500 1.24500
#> 5 m 0.744 0.00300 0.74700
#> 10 m 0.496 0.00075 0.49675
#> 20 m 0.248 0.00025 0.24825
#>
#> $PEC_sw_runoff
#> dissolved bound total
#> No buffer 4.769231 0.019230769 4.788462
#> 5 m 4.133333 0.016666667 4.150000
#> 10 m 3.542857 0.005357143 3.548214
#> 20 m 2.480000 0.002500000 2.482500
#> </div><div class='input'> <span class='fu'>PEC_sw_exposit_runoff</span>(<span class='fl'>600</span>, <span class='kw'>Koc</span> <span class='kw'>=</span> <span class='fl'>10000</span>, <span class='kw'>DT50</span> <span class='kw'>=</span> <span class='fl'>195</span>, <span class='kw'>exposit</span> <span class='kw'>=</span> <span class='st'>"3.01a"</span>)</div><div class='output co'>#> $perc_runoff
#> dissolved bound
#> 0.037 0.159
#>
#> $runoff
#> dissolved bound total
#> No buffer 0.21964521 0.94388078 1.16352600
#> 3 m 0.16473391 0.66071655 0.82545046
#> 5 m 0.13178713 0.56632847 0.69811560
#> 6 m 0.12080487 0.42474635 0.54555122
#> 10 m 0.08785809 0.14158212 0.22944020
#> 20 m 0.04392904 0.04719404 0.09112308
#>
#> $PEC_sw_runoff
#> dissolved bound total
#> No buffer 0.8447893 3.6303107 4.4751000
#> 3 m 0.7844472 3.1462693 3.9307165
#> 5 m 0.7321507 3.1462693 3.8784200
#> 6 m 0.7106169 2.4985080 3.2091248
#> 10 m 0.6275578 1.0113008 1.6388586
#> 20 m 0.4392904 0.4719404 0.9112308
#> </div></pre>
</div>
<div class="col-md-3 hidden-xs hidden-sm" id="sidebar">
<h2>Contents</h2>
<ul class="nav nav-pills nav-stacked">
<li><a href="#arguments">Arguments</a></li>
<li><a href="#source">Source</a></li>
<li><a href="#value">Value</a></li>
<li><a href="#see-also">See also</a></li>
<li><a href="#examples">Examples</a></li>
</ul>
</div>
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