For this purpose the culvert was pre-assembled and all ductwork embedded on a supporting scaffold. At lean flow, the river was then temporarily blocked and bypassed over the construction site. Within less than 8 hours the culvert was lifted, transshipped, adjusted, finally assembled, pressure tested and covered with rapidly setting concrete to allow the flow to continue flowing undisturbed. Finally, the riverbed with optical marking of the crossing area was restored to its original base condition.
The connection to the pipes leading away from the riverbed could be completed without time restrictions.