In such cases, {TAIL ~ rain water} and {HEAD ~ precipitation} can collect on a top surface 
In such cases , { TAIL ~ rain water } and { HEAD ~ precipitation } can collect on a top surface
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH