gather the waters pumped from the Kesteven Fens, the Holland Fens and the Weir Dyke, a soak dike in Bourne North Fen, alongside the Bourne Eau and River Glen, northwards and eastwards to the Black Sluice at Boston, where they are discharged to the tidal waters of The Haven. The Weir Dyke takes its name from a weir in the bank of the Bourne Eau at Tongue End, which was constructed by the Black Sluice Commissioners, to allow water from the Bourne Eau to overflow the bank when excess water could not flow into the River Glen in times of flood. The overfall weir became redundant when the Tongue End pumping station was constructed in 1966. The South Forty-Foot Drain and the Black Sluice pumping station, together with most of the side channels which run into the drain are the responsibility of the Environment Agency. Management of the drainage ditches which drain the Fens are the responsibility of the Black Sluice Internal Drainage Board, who maintain 34 pumping stations and three gravity stations in the region. Of these, 21 are situated on the banks of the Drain, and pump directly into it, while one, the Black Hole Drove pumping station, is constructed over the channel, and acts as a boundary between the part of the Drain managed by the Environment Agency, and that managed by the Drainage Board. Navigation Prior to 1971, the Drain had been navigable, and in 1939, it was listed as being navigable for , from Boston to Gutham (sic) Gowt. Boats up to long and wide, with a draught of about could use the waterway as far as Donington Bridge, but above that, the draught decreased to . It was only open to commercial craft, as pleasure craft were expressly prohibited. It is unclear whether there was ever a right of navigation, or whether the Black Sluice Commissioners simply allowed it. The entrance lock was , and most trade was between Boston and Donnington Bridge, with pleasure boating not being allowed prior to 1962. Navigation ceased in 1971, when the lock was closed and removed, with little protest being made. More recently, the East Anglian Waterways Association promoted the idea that the Drain could again be made navigable as part of a larger scheme to improve leisure facilities. The local authorities which were part of the Fens Tourism consortium conducted a feasibility study, and this report