9. Culverts, bridges and walls
Where a road or footpath crosses a watercourse, to maintain the water flow, a pipe, box, known as a culvert will be required. A pipe or box less than 600mm in diameter or height shall be designed in accordance with the Draining surface water run-off section. A pipe or box 600mm or greater in diameter or height shall be known as a structure.
Bridges with a distance between supports of 600mm or greater, and walls, known as retaining walls, supporting the roads and footpaths of 600mm or greater in height shall be known as a structure.
All structures shall be designed in accordance with our guidelines for structures.
Structures supporting roads or footpaths may be designed by the County Council.
A road or footpath in a legal agreement with us shall include the supporting structures and all its parts.
Private retaining wall
A wall supporting soil and located up to 3.65m from a public road or footpath with a height greater than 1.35m must be approved by us.
Brickwork
Some headwalls and parapets may be built or clad with brick. When building brickwork above completed concrete or stonework, precautions should be in place to prevent mortar or debris from falling into the open expansion joints
Exposed joints shall be treated in the following ways:
- Pointed joints should be raked out to a depth of 14mm, pointed with mortar and finished with flush pointing.
- Un-pointed joints should be cleaned out to a depth of 14mm, filled with mortar and finished flush along with the following:
- No overhand work is allowed.
- Putlog holes must be filled with matching bricks.
- Every third course should be laid straight.
- All vertical joints must be accurate.
Facing brickwork shall be securely bonded to the backing bricks or concrete using approved anchor ties as needed and should not be built more than 600mm ahead of the backing bricks or concrete at any time.