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• <br />• <br />0 <br />Headwall with or Roadbed width <br />without <br />wingwalls <br />Fill <br />J <br />Entrance y 30 cm min. I <br />elevation Compacted ova <br />?r <br />`tatura fill <br />ground <br />Slope of channel Outlet elevation <br />' Total length orpi at ground level <br />p' <br />Wo I Splash apron <br />Distance between headwalls ( with Key <br />Typical culvert installation with headwalls and splash <br />apron or plunge pool with riprap for energy dissipa- <br />tion and scour control. <br />or <br />r <br />t? <br />?Water level <br />1-2 m wide <br />with roughened or <br />rock surface <br />Key 0.3-1.0 in deep <br />Detail of splash apron <br />with scour cutoff key. <br />LOW-VOLUME ROADS BMPs.82 <br />Riprap lining <br />Detail of outlet with riprap <br />and plunge pool.