Cubitt's first waterway project was the Norwich & Lowestoft Navigation, then he engineered the straightening of the northern part of the Oxford Canal. He became Telford's successor on what is now known as the Shropshire Union Canal and on the Ulster Canal. His largest waterway scheme was the improvement of the River Servern, including building four locks and weirs.
Docks schemes included Lowestoft, Ellesmere Port, Cardiff and Middlesbrough.
Biography with a listing of completed works.

