George Bradshaw, Lengths and Levels To Bradshaw's Maps (1833)
“ Tunnel 2 2 The Summit-level here given is 1 foot below the level of an average Spring Tide. The River Wey to Guildford. Mls. Frl. No. ofLocks Rise Fall Above datum atLiverpool. Ft. In. Ft. In. From the River Thames at Weybridge to the junction of the Basingstoke Canal at Woodham 3 0 4 25 4 66 2 Thence to Trigg's Lock Head, near Woking 6 5 1⁄4 5 26 1 92 3 Thence to the Boundary near north side of Guildford Bridge 5 4 3⁄4 2 13 10 106 1 15 2 11 65 3 106 1 The River Wey from Guildford to Godalming. ”
