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    <h1>Calculate FOCUS Step 1 PEC surface water</h1>
    </div>

    
    <p>This is reimplementation of Step 1 of the FOCUS Step 1 and 2 calculator
version 3.2, authored by Michael Klein. Note that results for multiple
applications should be compared to the corresponding results for a
single application. At current, this is not done automatically in
this implementation.</p>
    

    <pre class="usage"><span class='fu'>PEC_sw_focus</span>(<span class='no'>parent</span>, <span class='no'>rate</span>, <span class='kw'>n</span> <span class='kw'>=</span> <span class='fl'>1</span>, <span class='kw'>i</span> <span class='kw'>=</span> <span class='fl'>NA</span>, <span class='kw'>met</span> <span class='kw'>=</span> <span class='kw'>NULL</span>, <span class='kw'>f_drift</span> <span class='kw'>=</span> <span class='fl'>NA</span>,
  <span class='kw'>f_rd</span> <span class='kw'>=</span> <span class='fl'>0.1</span>, <span class='kw'>scenario</span> <span class='kw'>=</span> <span class='no'>FOCUS_Step_12_scenarios</span>$<span class='no'>names</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>parent</th>
      <td><p>A list containing substance specific parameters</p></td>
    </tr>
    <tr>
      <th>rate</th>
      <td><p>The application rate in g/ha. Overriden when
applications are given explicitly</p></td>
    </tr>
    <tr>
      <th>n</th>
      <td><p>The number of applications</p></td>
    </tr>
    <tr>
      <th>i</th>
      <td><p>The application interval</p></td>
    </tr>
    <tr>
      <th>met</th>
      <td><p>A list containing metabolite specific parameters. If not NULL, 
the PEC is calculated for this compound, not the parent.</p></td>
    </tr>
    <tr>
      <th>f_drift</th>
      <td><p>The fraction of the application rate reaching the waterbody
via drift. If NA, this is derived from the scenario name and the number
of applications via the drift data defined by the 
<code><a href='FOCUS_Step_12_scenarios.html'>FOCUS_Step_12_scenarios</a></code></p></td>
    </tr>
    <tr>
      <th>f_rd</th>
      <td><p>The fraction of the amount applied reaching the waterbody via
runoff/drainage. At Step 1, it is assumed to be 10<!-- %, be it the -->
parent or a metabolite</p></td>
    </tr>
    <tr>
      <th>scenario</th>
      <td><p>The name of the scenario. Must be one of the scenario
names given in <code><a href='FOCUS_Step_12_scenarios.html'>FOCUS_Step_12_scenarios</a></code></p></td>
    </tr>
    </table>
    
    <h2 class="hasAnchor" id="note"><a class="anchor" href="#note"></a>Note</h2>

    <p>The formulas for input to the waterbody via runoff/drainage of the
  parent and subsequent formation of the metabolite in water is not
  documented in the model description coming with the calculator</p>
<p>Step 2 is not implemented</p>
    
    <h2 class="hasAnchor" id="references"><a class="anchor" href="#references"></a>References</h2>

    <p>FOCUS (2014) Generic guidance for Surface Water Scenarios (version 1.4).
 FOrum for the Co-ordination of pesticde fate models and their USe.
 http://esdac.jrc.ec.europa.eu/public_path/projects_data/focus/sw/docs/Generic<!-- %20FOCUS_SWS_vc1.4.pdf --></p>
<p>Website of the Steps 1 and 2 calculator at the Joint Research
  Center of the European Union:
  http://esdac.jrc.ec.europa.eu/projects/stepsonetwo</p>
    

    <h2 class="hasAnchor" id="examples"><a class="anchor" href="#examples"></a>Examples</h2>
    <pre class="examples"><div class='input'><span class='co'># Parent only</span>
<span class='no'>dummy_1</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='chent_focus_sw.html'>chent_focus_sw</a></span>(<span class='kw'>cwsat</span> <span class='kw'>=</span> <span class='fl'>6000</span>, <span class='kw'>DT50_ws</span> <span class='kw'>=</span> <span class='fl'>6</span>, <span class='kw'>Koc</span> <span class='kw'>=</span> <span class='fl'>344.8</span>)
<span class='fu'>PEC_sw_focus</span>(<span class='no'>dummy_1</span>, <span class='fl'>3000</span>, <span class='kw'>f_drift</span> <span class='kw'>=</span> <span class='fl'>0</span>)</div><div class='output co'>#&gt; $f_drift
#&gt; [1] 0
#&gt; 
#&gt; $eq_rate_drift_s
#&gt; [1] 3000
#&gt; 
#&gt; $eq_rate_rd_s
#&gt; [1] 3000
#&gt; 
#&gt; $eq_rate_rd_parent_s
#&gt; [1] NA
#&gt; 
#&gt; $input_drift_s
#&gt; [1] 0
#&gt; 
#&gt; $input_rd_s
#&gt; [1] 300
#&gt; 
#&gt; $f_rd_sw
#&gt; [1] 0.6850566
#&gt; 
#&gt; $f_rd_sed
#&gt; [1] 0.3149434
#&gt; 
#&gt; $PEC
#&gt;      type
#&gt; Time         PECsw  TWAECsw       PECsed TWAECsed
#&gt;   0   6.850566e+02       NA 2.362075e+03       NA
#&gt;   1   6.103161e+02 647.6864 2.104370e+03 2233.223
#&gt;   2   5.437298e+02       NA 1.874780e+03       NA
#&gt;   4   4.315586e+02       NA 1.488014e+03       NA
#&gt;   7   3.051580e+02       NA 1.052185e+03       NA
#&gt;   14  1.359325e+02       NA 4.686951e+02       NA
#&gt;   21  6.055102e+01       NA 2.087799e+02       NA
#&gt;   28  2.697241e+01       NA 9.300089e+01       NA
#&gt;   42  5.352005e+00       NA 1.845371e+01       NA
#&gt;   50  2.123945e+00       NA 7.323361e+00       NA
#&gt;   100 6.585062e-03       NA 2.270529e-02       NA
#&gt; 
#&gt; $PEC_sw_max
#&gt; [1] 685.0566
#&gt; 
#&gt; $PEC_sed_max
#&gt; [1] 2362.075
#&gt; </div><div class='input'>
<span class='co'># Metabolite</span>
<span class='no'>new_dummy</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='chent_focus_sw.html'>chent_focus_sw</a></span>(<span class='kw'>mw</span> <span class='kw'>=</span> <span class='fl'>250</span>, <span class='kw'>Koc</span> <span class='kw'>=</span> <span class='fl'>100</span>)
<span class='no'>M1</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='chent_focus_sw.html'>chent_focus_sw</a></span>(<span class='kw'>mw</span> <span class='kw'>=</span> <span class='fl'>100</span>, <span class='kw'>cwsat</span> <span class='kw'>=</span> <span class='fl'>100</span>, <span class='kw'>DT50_ws</span> <span class='kw'>=</span> <span class='fl'>100</span>, <span class='kw'>Koc</span> <span class='kw'>=</span> <span class='fl'>50</span>, <span class='kw'>max_ws</span> <span class='kw'>=</span> <span class='fl'>0</span>, <span class='kw'>max_soil</span> <span class='kw'>=</span> <span class='fl'>0.5</span>)
<span class='fu'>PEC_sw_focus</span>(<span class='no'>new_dummy</span>, <span class='fl'>1000</span>, <span class='kw'>scenario</span> <span class='kw'>=</span> <span class='st'>"cereals, winter"</span>, <span class='kw'>met</span> <span class='kw'>=</span> <span class='no'>M1</span>)</div><div class='output co'>#&gt; $f_drift
#&gt; [1] 0.02759
#&gt; 
#&gt; $eq_rate_drift_s
#&gt; [1] 0
#&gt; 
#&gt; $eq_rate_rd_s
#&gt; [1] 200
#&gt; 
#&gt; $eq_rate_rd_parent_s
#&gt; [1] 0
#&gt; 
#&gt; $input_drift_s
#&gt; [1] 0
#&gt; 
#&gt; $input_rd_s
#&gt; [1] 20
#&gt; 
#&gt; $f_rd_sw
#&gt; [1] 0.9375
#&gt; 
#&gt; $f_rd_sed
#&gt; [1] 0.0625
#&gt; 
#&gt; $PEC
#&gt;      type
#&gt; Time     PECsw  TWAECsw   PECsed TWAECsed
#&gt;   0   62.50000       NA 31.25000       NA
#&gt;   1   62.06828 62.28414 31.03414 31.14207
#&gt;   2   61.63954       NA 30.81977       NA
#&gt;   4   60.79093       NA 30.39547       NA
#&gt;   7   59.53987       NA 29.76994       NA
#&gt;   14  56.71995       NA 28.35997       NA
#&gt;   21  54.03358       NA 27.01679       NA
#&gt;   28  51.47444       NA 25.73722       NA
#&gt;   42  46.71404       NA 23.35702       NA
#&gt;   50  44.19417       NA 22.09709       NA
#&gt;   100 31.25000       NA 15.62500       NA
#&gt; 
#&gt; $PEC_sw_max
#&gt; [1] 62.5
#&gt; 
#&gt; $PEC_sed_max
#&gt; [1] 31.25
#&gt; </div></pre>
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      <li><a href="#arguments">Arguments</a></li>
      
      <li><a href="#note">Note</a></li>

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