Vodootvodny Canal () is a 4 kilometre long, 30-60 metre wide canal in downtown Moscow, Russia. It was built in the 1780s on the old riverbed of the Moskva River to control floods and support shipping. Canal construction created an island between the Moskva River and the canal. The island acquired its present shape in 1938 with the completion of Moscow Canal megaproject. The canal is spanned by ten bridges; the eleventh is now under construction. Moscow floods Zamoskvorechye, the land on the flat southern bank of Moskva river, was frequently flooded in spring. The river itself used to migrate south from its present site and back, discouraging construction. Low lands on both sides of the river were only suitable for farming. In dry periods, the old river bed used to shrink into isolated muddy swamps, spreading disease. Residents had to combat inundation levels by digging small moats and dikes, with little result. The memory of these moats (ровушки, ендовы; rovyshki, yendovy) remains in the names of Raushskaya embankment and Church of St. George v Yendove (literally, in the pot). The most notable, permanent moat was that separating St. George from Balchug Street. Kazakov project, 1775 The first documented flood control project was drawn up in 1775, presumably by Matvey Kazakov (senior). In addition to creating an island separated from Zamoskvorechye, Kazakov also proposed cutting two flood control dikes west from Bersenevka. This would separate strips of floodland from the mainland, creating two more islands. In the east, Kazakov planned to flood uninhabited farmland permanently, and connect the Canal to the Moskva River inside the present-day Garden Ring. The eastern end of an island would become Moscow's fortified grain port and warehouse. The moat east of Balchug had to be cleared and widened, too. 1783–1786 canal A notably devastating flood occurred in 1783, razing the suburbs and damaging Bolshoy Kamenny Bridge (three spans collapsed, killing four people). In order to repair it, the Moskva River was temporarily drained, and its water diverted into the old river bed. Prior to closing the main waterway, the old river bed was cleared and widened. Kazakov's plan materialized in 1783-1786, excluding the grain terminal. An 1807 plan shows only one "additional" island west of Bersenevka; otherwise, it follows Kazakov's project; the main island is cut into two halves by the Balchug moat. 19th century After the Fire of 1812, the western island and the