Braunston Tunnel ft (2.13 m) beam boats to pass. There are three air shafts along its length. The tunnel passes underground alongside another Grand Union Canal feature, Drayton Reservoir, from which the feeder enters the canal at the east end of the tunnel. Braunston Tunnel Braunston Tunnel is on the Grand Union Canal about 830 yds (760 m) east of Braunston, Northamptonshire, England top lock. It is in the northern outskirts of Daventry, about 2 km east of the village of Braunston. Braunston Tunnel is 2,042 yards (1,867 m) in length. Built by Jessop and Barnes, the tunnel has no towpath and
Lapal Tunnel section of canal from a new junction with the Worcester and Birmingham Canal to the recently reconstructed Harborne Lane bridge. Lapal Tunnel The Lapal Tunnel (old spelling Lappal Tunnel) is a disused canal tunnel on the five mile dry section of the Dudley No. 2 Canal in the West Midlands, England. It takes its name from the settlement of Lapal. The narrow brick-lined tunnel, built in 1798 by William Underhill, had no towpath. It had a very small bore - at 7 feet 9 inches, barely wider than the boats which used it, with a headroom of only 6 feet.