How to build a mortared structure in a stony river bed 1. Dig a diversion Channel2 Dam the river at both ends & Divert the river3 Constructed mortared stone peers in river bed4 Construct bridge5 Remove Dams6 Block diversion channelNotes1...
1. Dig a diversion Channel
3 Constructed mortared stone peers in river bed
4 Construct bridge
5 Remove Dams
6 Block diversion channel
Notes
1 The initial Bridge was intended to carry the Wall only.2 In theory, second [undetected] Bridge would have carried the Road south of the Wall. this road is evidenced by its construction trench aka The Vallum.3 [This itself was have replaced another lost bridge for the Staingate road, although piled timber would be adequate for road bridges]. 4 This first phase of road, like most of the early “Broad Wall” was never completed5 Subsequently, a second wider bridge was constructed to carry the Wall & a roadway now represented by the Military Way towards the end of the century.
The Diversion Channel encloses an area almost a large as the fort at Chesters on the opposite bank, one of the original forts presumably designed by Hadrian, who would have almost certainly got involved with bridge design.
Standard Disclaimer; Not Available at University
Academics just don’t think about these problems, and are content with reproducing of the ideas previous generations. Thus, as an evidence based form of archaeology using science and engineering proved incompatible with the faith based archaeology currently practiced at many Russell Brand Universities like Newcastle, the last bastions of Science denial.