<p>As per <a href="http://meta.stackexchange.com/questions/79742/are-the-new-moderator-flag-limits-sufficiently-high/80117#80117">this meta.SO post</a>, the flag count is calculated as:</p>

<blockquote>
  <ul>
  <li>default 10 per day</li>
  <li>one bonus flag per 2000 reputation</li>
  <li>one bonus flag per 20 "flag weight" above the default</li>
  <li>maximum 100</li>
  </ul>
</blockquote>

<p>"Flag weight", although it <a href="http://meta.stackexchange.com/questions/119715/what-happened-to-flag-weight">has been removed from the UI</a>, still exists in the backend. It's calculated as such:</p>

<blockquote>
  <ul>
  <li>start at 100</li>
  <li>+10 for a flagged post (+5 for a comment) that we did something about (or was basically valid)</li>
  <li>-10 for a flagged post (-5 for a comment) that we suppressed as invalid</li>
  <li>min 0, max 750 (but non-linear above 500)</li>
  <li><strong>IMPORTANT CHANGE</strong> - if you flag so consistently badly that you reach 0 weight, flags will be suppressed</li>
  </ul>
</blockquote>

<p>Therefore, if your flag weight has risen way beyond 100, you already get many new flags every day. :)</p>