s) of the features to be extracted. For example 
to extract data for the whole of the Humber RBD, this would be "Humber"; 
also see examples. Must be anexact match to the values used in the EA 
database. Use the <code><a href='search_names.html'>search_names</a></code> function to search for 
specific values.</p></td>
    </tr>
    <tr>
      <th>column</th>
      <td><p>The column to be searched. Possible options are
<code>WBID</code> (waterbody id), <code>OC</code> (Operational Catchment), <code>MC</code>