Height rises only by spending pressure in a checked ideal budget. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Low outlet leaves pressure high
Speed stays v=4 m/s. Height h=0 m adds height term 0 pascals, leaving pressure 84 pascals.
84+16+0=100
One metre of height costs twenty pascals
Speed stays v=4 m/s. Height h=1 m adds height term 20 pascals, leaving pressure 64 pascals.
64+16+20=100
Three metres of height costs sixty pascals
Speed stays v=4 m/s. Height h=3 m adds height term 60 pascals, leaving pressure 24 pascals.