Independent contractor in hydraulic engineering
For Leeghwater, the Beemster marked a flying start to a fine career as a hydraulic expert and mill builder. We encounter him in all the major reclamation works, from the Purmer (dry in 1622) to the Starnmeer (dry in 1643). However, he was never in charge, nor was he permanently employed. Furthermore, he advised all kinds of polders on problems with water management and dikes. Leeghwater traveled after work as a freelancer. In 1629, for example, we find him at besieged Den Bosch, where he helped drain the inundated area around the city. And in 1633 he worked in the moors near Smilde. There he designed locks in the Nijeveense Grift, a canal for peat ships.