Here, {TAIL ~ a relatively low variation} in {HEAD ~ water level} would indicate the presence of a siphonic phenomemon 
Here , { TAIL ~ a relatively low variation } in { HEAD ~ water level } would indicate the presence of a siphonic phenomemon
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH