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      <h1>Calculate initial predicted environmental concentrations in surface water due to drainage using the UK method</h1>

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    <h2>Usage</h2>
    <pre><div>PEC_sw_drainage_UK_ini(rate, interception&nbsp;=&nbsp;0, Koc, latest_application&nbsp;=&nbsp;NULL, soil_DT50&nbsp;=&nbsp;NULL, model&nbsp;=&nbsp;NULL, model_parms&nbsp;=&nbsp;NULL)</div></pre>
    
    <h2>Arguments</h2>
    <dl>
      <dt>rate</dt>
      <dd>Application rate in g/ha</dd>
      <dt>interception</dt>
      <dd>The fraction of the application rate that does not reach the soil</dd>
      <dt>Koc</dt>
      <dd>The sorption coefficient normalised to organic carbon in L/kg</dd>
      <dt>latest_application</dt>
      <dd>Latest application date, formatted as e.g. "01 July"</dd>
      <dt>soil_DT50</dt>
      <dd>Soil degradation half-life, if SFO kinetics are to be used</dd>
      <dt>model</dt>
      <dd>The degradation model to be used. Either one of "FOMC", "DFOP", 
"HS", or "IORE", or an mkinmod object</dd>
      <dt>model_parms</dt>
      <dd>A named numeric vector containing the model parameters</dd>
    </dl>
    
    <div class="Value">
      <h2>Value</h2>

      <p><dl>
The predicted concentration in surface water in µg/L
</dl></p>
  
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    <div class="Description">
      <h2>Description</h2>

      <p>This implements the method specified in the UK data requirements handbook and was checked against the spreadsheet
published on the CRC website</p>
  
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    <h2 id="examples">Examples</h2>
    <pre class="examples"><div class='input'>PEC_sw_drainage_UK_ini(150, Koc = 100)
</div>
<div class='output'>[1] 8.076923
</div></pre>
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    <h2>Author</h2>
    
Johannes Ranke

    
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