Pieter Jacobus Wemelsfelder

Pieter Jacobus (P.J.) Wemelsfelder (18 November 1907 – 1 July 1995) was a Dutch hydraulic engineer who made significant contributions to the field of hydrometry in the Netherlands, and in hydraulic engineering internationally. In addition to his involvement in the design and planning of the Delta Works, he published widely and is notable for the first use of probability theory in the design of flood levels.

Source: Wikipedia — Pieter Jacobus Wemelsfelder (CC BY-SA 4.0)