A horizontal, circular pipe connects two big reservoirs, 1 and 2. The length of the pipe is 100 m. The pipe diameter is suddenly increased from 300 to 600 mm at the midpoint between the two reservoirs. The loss coefficient at the pipe entrance is 0.50. The frictional coefficients in the smaller and larger pipes are 0.030 and 0.020, respectively. The water flow rate, Q, is 18 m3/min. Calculate the water surface height difference, H.

A horizontal, circular pipe connects two big reservoirs, 1 and 2. The length of the pipe is 100 m. The pipe diameter is suddenly increased from 300 to 600 mm at the midpoint between the two reservoirs. The loss coefficient at the pipe entrance is 0.50. The frictional coefficients in the smaller and larger pipes are 0.030 and 0.020, respectively. The water flow rate, Q, is 18 m³/min. Calculate the water surface height difference, H.