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  <a class="nav-link" href="../reference/index.html">Reference</a>
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  <main id="main" class="col-md-9"><div class="page-header">
      <img src="" class="logo" alt=""><h1>Function reference</h1>
    </div>

    <div class="section level2">
      <h2 id="general-utility-functions">General utility functions<a class="anchor" aria-label="anchor" href="#general-utility-functions"></a></h2>
      
      <p class="section-desc"></p><p>Functions that are independent of specific fate modelling areas</p>

      
    </div><div id="" class="section level2">
      
      
      <dl><dt>
          
          <code><a href="geomean.html">geomean()</a></code> 
        </dt>
        <dd>Calculate the geometric mean</dd>
      </dl><dl><dt>
          
          <code><a href="one_box.html">one_box()</a></code> 
        </dt>
        <dd>Create a time series of decline data</dd>
      </dl><dl><dt>
          
          <code><a href="plot.one_box.html">plot(<i>&lt;one_box&gt;</i>)</a></code> 
        </dt>
        <dd>Plot time series of decline data</dd>
      </dl><dl><dt>
          
          <code><a href="sawtooth.html">sawtooth()</a></code> 
        </dt>
        <dd>Create decline time series for multiple applications</dd>
      </dl><dl><dt>
          
          <code><a href="twa.html">twa()</a></code> 
        </dt>
        <dd>Calculate a time weighted average concentration</dd>
      </dl><dl><dt>
          
          <code><a href="max_twa.html">max_twa()</a></code> 
        </dt>
        <dd>The maximum time weighted average concentration for a moving window</dd>
      </dl><dl><dt>
          
          <code><a href="pfm_degradation.html">pfm_degradation()</a></code> 
        </dt>
        <dd>Calculate a time course of relative concentrations based on an mkinmod model</dd>
      </dl><dl><dt>
          
          <code><a href="SFO_actual_twa.html">SFO_actual_twa()</a></code> 
        </dt>
        <dd>Actual and maximum moving window time average concentrations for SFO kinetics</dd>
      </dl><dl><dt>
          
          <code><a href="FOMC_actual_twa.html">FOMC_actual_twa()</a></code> 
        </dt>
        <dd>Actual and maximum moving window time average concentrations for FOMC kinetics</dd>
      </dl><dl><dt>
          
          <code><a href="reexports.html">reexports</a></code> <code><a href="reexports.html">set_nd_nq</a></code> <code><a href="reexports.html">set_nd_nq_focus</a></code> 
        </dt>
        <dd>Objects exported from other packages</dd>
      </dl><dl><dt>
          
          <code><a href="TSCF.html">TSCF()</a></code> 
        </dt>
        <dd>Estimation of the transpiration stream concentration factor</dd>
      </dl></div><div class="section level2">
      <h2 id="predicted-environmental-concentrations-in-soil">Predicted environmental concentrations in soil<a class="anchor" aria-label="anchor" href="#predicted-environmental-concentrations-in-soil"></a></h2>
      
      
    </div><div id="" class="section level2">
      
      
      <dl><dt>
          
          <code><a href="PEC_soil.html">PEC_soil()</a></code> 
        </dt>
        <dd>Calculate predicted environmental concentrations in soil</dd>
      </dl><dl><dt>
          
          <code><a href="PEC_soil_mets.html">PEC_soil_mets()</a></code> 
        </dt>
        <dd>Calculate initial and accumulation PEC soil for a set of metabolites</dd>
      </dl><dl><dt>
          
          <code><a href="soil_scenario_data_EFSA_2015.html">soil_scenario_data_EFSA_2015</a></code> 
        </dt>
        <dd>Properties of the predefined scenarios from the EFSA guidance from 2015</dd>
      </dl><dl><dt>
          
          <code><a href="soil_scenario_data_EFSA_2017.html">soil_scenario_data_EFSA_2017</a></code> 
        </dt>
        <dd>Properties of the predefined scenarios from the EFSA guidance from 2017</dd>
      </dl><dl><dt>
          
          <code><a href="PEC_FOMC_accu_rel.html">PEC_FOMC_accu_rel()</a></code> 
        </dt>
        <dd>Get the relative accumulation of an FOMC model over multiples of an interval</dd>
      </dl><dl><dt>
          
          <code><a href="EFSA_washoff_2017.html">EFSA_washoff_2017</a></code> 
        </dt>
        <dd>Subset of EFSA crop washoff default values</dd>
      </dl></div><div class="section level2">
      <h2 id="predicted-environmental-concentrations-in-groundwater">Predicted environmental concentrations in groundwater<a class="anchor" aria-label="anchor" href="#predicted-environmental-concentrations-in-groundwater"></a></h2>
      
      
    </div><div id="" class="section level2">
      
      
      <dl><dt>
          
          <code><a href="FOCUS_GW_scenarios_2012.html">FOCUS_GW_scenarios_2012</a></code> 
        </dt>
        <dd>A very small subset of the FOCUS Groundwater scenario definitions</dd>
      </dl><dl><dt>
          
          <code><a href="EFSA_GW_interception_2014.html">EFSA_GW_interception_2014</a></code> 
        </dt>
        <dd>Subset of EFSA crop interception default values for groundwater modelling</dd>
      </dl></div><div class="section level2">
      <h2 id="predicted-environmental-concentrations-in-surface-water">Predicted environmental concentrations in surface water<a class="anchor" aria-label="anchor" href="#predicted-environmental-concentrations-in-surface-water"></a></h2>
      
      
    </div><div id="" class="section level2">
      
      
      <dl><dt>
          
          <code><a href="PEC_sw_drift.html">PEC_sw_drift()</a></code> 
        </dt>
        <dd>Calculate predicted environmental concentrations in surface water due to drift</dd>
      </dl><dl><dt>
          
          <code><a href="drift_data_JKI.html">drift_data_JKI</a></code> 
        </dt>
        <dd>Deposition from spray drift expressed as percent of the applied dose as
published by the JKI</dd>
      </dl><dl><dt>
          
          <code><a href="drift_parameters_focus.html">drift_parameters_focus</a></code> 
        </dt>
        <dd>Regression parameters for the Rautmann drift data</dd>
      </dl><dl><dt>
          
          <code><a href="drift_percentages_rautmann.html">drift_percentages_rautmann()</a></code> 
        </dt>
        <dd>Calculate drift percentages based on Rautmann data</dd>
      </dl><dl><dt>
          
          <code><a href="PEC_sw_drainage_UK.html">PEC_sw_drainage_UK()</a></code> 
        </dt>
        <dd>Calculate initial predicted environmental concentrations in surface water due to drainage using the UK method</dd>
      </dl><dl><dt>
          
          <code><a href="PEC_sw_sed.html">PEC_sw_sed()</a></code> 
        </dt>
        <dd>Calculate predicted environmental concentrations in sediment from surface
water concentrations</dd>
      </dl><dl><dt>
          
          <code><a href="PEC_sw_focus.html">PEC_sw_focus()</a></code> 
        </dt>
        <dd>Calculate PEC surface water at FOCUS Step 1</dd>
      </dl><dl><dt>
          
          <code><a href="chent_focus_sw.html">chent_focus_sw()</a></code> 
        </dt>
        <dd>Create a chemical compound object for FOCUS Step 1 calculations</dd>
      </dl><dl><dt>
          
          <code><a href="FOCUS_Step_12_scenarios.html">FOCUS_Step_12_scenarios</a></code> 
        </dt>
        <dd>Step 1/2 scenario data as distributed with the FOCUS Step 1/2 calculator</dd>
      </dl><dl><dt>
          
          <code><a href="PEC_sw_exposit_drainage.html">PEC_sw_exposit_drainage()</a></code> 
        </dt>
        <dd>Calculate PEC surface water due to drainage as in Exposit 3</dd>
      </dl><dl><dt>
          
          <code><a href="PEC_sw_exposit_runoff.html">PEC_sw_exposit_runoff()</a></code> 
        </dt>
        <dd>Calculate PEC surface water due to runoff and erosion as in Exposit 3</dd>
      </dl><dl><dt>
          
          <code><a href="perc_runoff_exposit.html">perc_runoff_exposit</a></code> 
        </dt>
        <dd>Runoff loss percentages as used in Exposit 3</dd>
      </dl><dl><dt>
          
          <code><a href="perc_runoff_reduction_exposit.html">perc_runoff_reduction_exposit</a></code> 
        </dt>
        <dd>Runoff reduction percentages as used in Exposit</dd>
      </dl><dl><dt>
          
          <code><a href="TOXSWA_cwa.html">TOXSWA_cwa</a></code> 
        </dt>
        <dd>R6 class for holding TOXSWA water concentration data and associated statistics</dd>
      </dl><dl><dt>
          
          <code><a href="read.TOXSWA_cwa.html">read.TOXSWA_cwa()</a></code> 
        </dt>
        <dd>Read TOXSWA surface water concentrations</dd>
      </dl><dl><dt>
          
          <code><a href="plot.TOXSWA_cwa.html">plot(<i>&lt;TOXSWA_cwa&gt;</i>)</a></code> 
        </dt>
        <dd>Plot TOXSWA surface water concentrations</dd>
      </dl></div><div class="section level2">
      <h2 id="classifications-and-indicators">Classifications and indicators<a class="anchor" aria-label="anchor" href="#classifications-and-indicators"></a></h2>
      
      <p class="section-desc"></p><p>Evaluating environmental fate properties</p>

      
    </div><div id="" class="section level2">
      
      
      <dl><dt>
          
          <code><a href="SSLRC_mobility_classification.html">SSLRC_mobility_classification()</a></code> 
        </dt>
        <dd>Determine the SSLRC mobility classification for a chemical substance from its Koc</dd>
      </dl><dl><dt>
          
          <code><a href="GUS.html">GUS()</a></code> <code><a href="GUS.html">print(<i>&lt;GUS_result&gt;</i>)</a></code> 
        </dt>
        <dd>Groundwater ubiquity score based on Gustafson (1989)</dd>
      </dl></div><div class="section level2">
      <h2 id="work-with-chent-objects-containing-relevant-information">Work with chent objects containing relevant information<a class="anchor" aria-label="anchor" href="#work-with-chent-objects-containing-relevant-information"></a></h2>
      
      
    </div><div id="" class="section level2">
      
      
      <dl><dt>
          
          <code><a href="endpoint.html">endpoint()</a></code> <code><a href="endpoint.html">soil_DT50()</a></code> <code><a href="endpoint.html">soil_Kfoc()</a></code> <code><a href="endpoint.html">soil_N()</a></code> <code><a href="endpoint.html">soil_sorption()</a></code> 
        </dt>
        <dd>Retrieve endpoint information from the chyaml field of a chent object</dd>
      </dl></div><div class="section level2">
      <h2 id="utilities">Utilities<a class="anchor" aria-label="anchor" href="#utilities"></a></h2>
      
      
    </div><div id="" class="section level2">
      
      
      <dl><dt>
          
          <code><a href="get_vertex.html">get_vertex()</a></code> 
        </dt>
        <dd>Fit a parabola through three points</dd>
      </dl></div>
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