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\n \n Gerhard, Ivan Kondratyevich ( Johann - Konrad) (1720–1808), an engineer, privy councillor. He was born in Germany (Schwabia) and he got the elementary education there after that he learned at the Academy of Sciences in St Petersburg. In 1765 he began to serve under the heading of Count Y.E. Sivers, the Novgorod governor, and Gerhard deserved the confidence of Count Sivers by his knowledge and diligence. From 1770 Gerhard took the post of an architect at the Imperial Water Constructions. The stores complex of the New Holland district (1765-1788), the Old Kalinkin Bridge across the Fontanka River (1786-1787), a bridge across the Kryukov Canal and the granite embankments of the Kryukov Canal (1801-1807), a pier with the descent on the Spit of Vasilyevsky Island and other constructions were built with participation of Gerhard. The construction of the 13-span constant drawbridge acroos the Neva River was designed by Gerhard (it was not realized ). Gerhard as a hydraulic engineering specialist worked on the development of the Ladoga Canal and the Vyshniy Volochek water way and also under the heading of F. Bauer he worked on the constructing of the Taitsi water supply system (1773-1784) for the providing Tsarskoye Selo by water. In 1795, when some parts of the water supply system became defunct, Gerhard suggested to replace the rotted wooden water pipes by the brickwork or to build the open stone canal with the fixing of the bottom and walls of the canal. The first more expencive variant was accepted. During 1795 - 1799 the stone canal with the length of 3 versts ( about 3 kilometres) was built by Engineer- Captain F. Toll under the heading of Gerhard . As well as the participation in the hydraulic work in St Petersburg , Gerhard as a member of the \"Commission for the Water Constructions for Moscow\" took part in the constructing of the Mytishchi water supply system. Gerhard headed the constructing after the death of Bauer, the author and the formal head of the constructing, in 1783. In 1797 Gerhard received the approval of his design for the providing Moscow by water and money for this work, all works were finished in 1804.\n
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