Review of flooding incidents on the HA Network in Autumn 2000 - Stage 2

This Project Report describes the scope and programme of work that was carried out for the Highways Agency for the continued review of the flooding incidents on the HA network during the Autumn of 2000. This is the second stage of the project and again was undertaken by TRL Ltd and HR Wallingford Ltd. The project consisted of three phases: Phase I: The preparation of the Inception Report. Phase 2: The development of guidance documentation on the runoff from the natural catchment adjacent to the carriageway and the design of culverts. Phase 3: The provision of technical assistance to take the guidance documentation through to publication. The Advice Notes published as outputs from this project will: reduce the risk of future highway drainage systems being unable to accommodate surface water from the adjacent natural catchments; ensure that future culverts and drainage outfalls are less affected by unusually high flows. The recommendations on maintenance and operations, if taken up, should reduce the risk to operatives of undertaking emergency works to the drainage system. The impact on road users should also be reduced.