Water Surge Calculator allows calculation of the overpressure that develops in the case of a rapid manoeuvre (less than 1 s) and is based on the Joukowsky equation, modified for plastic pipes. It can be used as a reference and the result cannot be associated with a network analysis. If a network analysis is required, we recommend that specialists be consulted. Simply select the pipe diameter, SDR value, modulus of elasticity, Poisson’s coefficient, water velocity variation, pipe PE type, daily number of water hammer and operating pressure.