Highway Maintenance

Maintenance of Existing Highway Drainage Systems

Table 1

Frequency of Ordinary and Cyclic Maintenance – inspection and/or cleansing



Drainage Mechanism

Minimum Frequency of Maintenance

Gullies, Catchpits & Interceptors

Annually as a guide but also based on assessed flood risk. In lower risk areas the frequency of cleansing may be reduced.   

Soakaways

Based on assessed flood risk but inspected at least every 5 years and cleansed where necessary.   

Gully Connections

Based on assessed flood risk.

Piped Drainage Systems

Based on assessed flood risk but up to 10 years in lower risk areas. Cleansed where necessary.

Piped Grips / Kerb Offlets

Based on assessed flood risk but annually as a guide. In lower risk areas the frequency may be reduced.

Grips (intercepting ditches)

Based on assessed flood risk. Cleared where necessary.

Filter Drains, Fin Drains

Based on assessed flood risk.

Roadside (Highway) Ditches

Based on assessed flood risk. Cleared where necessary.

Culverts

Based on assessed flood risk but every 3 years as a guide and up to 5 years in lower risk areas.

Balancing Ponds

Based on assessed flood risk and/or health and safety risk but inspected annually as a guide.

Sluices, Tidal Flaps etc

Based on assessed flood risk but inspected every 3 years as a guide.

Pumps and Other Specialised Equipment

In accordance with manufacturer's instructions.

Oil Interceptors

Inspected and/or cleansed annually.

Version No:   1.1

Effective from:   14/10/2010

If copied or printed, this document should be treated as uncontrolled and correct only at the date it was copied or printed.