The larger project will be carried out in joint venture with Black & Veatch to upgrade Keadby flood water pumping station near Scunthorpefor for the Environment Agency.
The 80-year-old station is located at the end of a complex network of rivers and pumping stations within the low-lying Isle of Axholme which spans around 200 square miles across South Yorkshire, Lincolnshire and Nottinghamshire.
The pumps help transfer flood water from the Three Rivers into the River Trent during high tides.
Work starts this month and full completion is set for June 2021.
The other project, worth £14.5m, involves the laying of a 10km pipeline in Chichester, West Sussex, for framework client Southern Water.
The new waste water transfer main with three new pumping stations will run from the west of the city to the Tangmere treatment works in the east.
The new infrastructure is necessary to connect three major housing developments of 3,800 homes in the catchment to the sewer network while complying with Environment Agency consents to limit storm discharges from the existing Chichester treatment works into the harbour.