A valve is rapidly closed in a 186 m water supply system with a velocity of 0.66 m/s. This water supply system has a time of return for a pressure wave of 35 seconds and a velocity of 0.53 m/s. Assume the density of water is 1000 kg/m^3. The valve is closed in 20 seconds. What is the pressure rise? Submit your answer to 1 decimal place without units.