The system 1, further comprising water pervious driveways, sidewalks and {HEAD ~ streets} that drain downward into said playgrounds and {TAIL ~ parks} 
drain downward into
The system 1 , further comprising water pervious driveways , sidewalks and { HEAD ~ streets } that drain downward into said playgrounds and { TAIL ~ parks }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL REL REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL