In the method, ice is pressed under the water along an inclined surface formed by {TAIL ~ a bar screen} or {HEAD ~ a grating} 
In the method , ice is pressed under the water along an inclined surface formed by { TAIL ~ a bar screen } or { HEAD ~ a grating }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD