{TAIL ~ The top} may include {HEAD ~ a slab} of water impermeable material having a substantially central opening through which plant material grows, as well as an inlet opening for receiving stormwater to be treated 
{ TAIL ~ The top } may include { HEAD ~ a slab } of water impermeable material having a substantially central opening through which plant material grows , as well as an inlet opening for receiving stormwater to be treated
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH