Infrastructure & Transport
Construction-phase supervision for a river valley crossing
Resident environmental and safety supervision across a 26-month bridge and approach-roads contract in a steep, erosion-prone catchment.
- Client
- National Highways Authority
- Sector
- Infrastructure & Transport
- Location
- Thika, Kenya
- Completed
- 2023
The assignment
Steep approach slopes and a sensitive riparian corridor made sediment release the dominant risk on this contract, with a hard requirement that downstream abstraction points stay usable throughout construction.
We designed a staged erosion and sediment control system tied to the earthworks programme, and kept a resident environmentalist and safety officer on site to audit it weekly against the contractor's method statements.
The crossing was handed over with zero lost-time incidents, no recorded turbidity exceedance at the downstream intake, and 1,850 metres of riparian planting established and under a two-year maintenance guarantee.
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