Embedded within the media is {TAIL ~ an underdrain pipe} that receives {HEAD ~ the treated stormwater} as it seeps through the media toward the bottom of the container 
Embedded within the media is { TAIL ~ an underdrain pipe } that receives { HEAD ~ the treated stormwater } as it seeps through the media toward the bottom of the container
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH