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<title>PEC_sw_drift_ini. pfm 0.2-4</title>
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      <h1>Calculate initial predicted environmental concentrations in surface water due to drift</h1>

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  <div class="span8">
    <h2>Usage</h2>
    <pre><div>PEC_sw_drift_ini(rate, applications&nbsp;=&nbsp;1, water_depth&nbsp;=&nbsp;30, drift_data&nbsp;=&nbsp;"JKI", crop&nbsp;=&nbsp;"Ackerbau", distances&nbsp;=&nbsp;c(1, 5, 10, 20), rate_units&nbsp;=&nbsp;"g/ha", PEC_units&nbsp;=&nbsp;"µg/L")</div></pre>
    
    <h2>Arguments</h2>
    <dl>
      <dt>rate</dt>
      <dd>Application rate in units specified below</dd>
      <dt>applications</dt>
      <dd>Number of applications for selection of drift percentile</dd>
      <dt>water_depth</dt>
      <dd>Depth of the water body in cm</dd>
      <dt>drift_data</dt>
      <dd>Source of drift percentage data</dd>
      <dt>crop</dt>
      <dd>Crop name (use German names for JKI data), defaults to "Ackerbau"</dd>
      <dt>distances</dt>
      <dd>The distances in m for which to get PEC values</dd>
      <dt>rate_units</dt>
      <dd>Defaults to g/ha</dd>
      <dt>PEC_units</dt>
      <dd>Requested units for the calculated PEC. Only µg/L currently supported</dd>
    </dl>
    
    <div class="Value">
      <h2>Value</h2>

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

      <p>This is a basic, vectorised form of a simple calculation of a contaminant
concentration in surface water based on complete, instantaneous mixing
with input via spray drift.</p>
  
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    <h2 id="examples">Examples</h2>
    <pre class="examples"><div class='input'>PEC_sw_drift_ini(100)
</div>
<div class='output'>       1 m        5 m       10 m       20 m 
0.92333333 0.19000000 0.09666667 0.05000000 
</div></pre>
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    <h2>Author</h2>
    
Johannes Ranke

    
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