{HEAD ~ Water} flowing through the intake grate flows through the concavity in a laminar flow and encounters {TAIL ~ no obstacles} other than the elongate drive shaft before encountering the impeller 
encounters
{ HEAD ~ Water } flowing through the intake grate flows through the concavity in a laminar flow and encounters { TAIL ~ no obstacles } other than the elongate drive shaft before encountering the impeller
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH