Ongoing
Flood Flow Diversion Tunnel
Approved
CONSTRUCTION OF NORTHERN COLLECTOR TUNNEL PHASE 1
Kajiado · Kajiado East · Kitengela
Overall Progress
1.00%
Project Overview
Implementing Agency
Athi Water Works Development Agency
Programme
4th Nairobi Bulk Water Supply Programme
Start Date
-
Planned End
-
Actual End
-
Contractor
China Gezhouba Group Company Limited
Consultant
SMEC Consulting Engineers of Australia
Location Type
Urban
Target Areas
Kitengela
Scope of Works
The scheme, under Phase 1, is to divert raw water from Maragua, Gikigie and Irati Rivers by means of weir control intakes and convey the intercepted raw water through an 11.8km long tunnel with 3.2m diameter to Thika Dam Reservoir. The total design intercepted flow is 6.0 m³/s. The proposed major elements of the project Construction of 11.712km main tunnel Construction of 904m Adits, Construction of 2 no. Shafts, each 50m deep, Construction of 3 no. intake weirs at Maragua, Gikigie and Irati, Construction of Githika outfall structure, Portal/tunnel entrance works at Maragua, Gikigie, Kaanja and Irati
Impacts
Improve water supply to 1.2m,to promote socio-economic to the people
Key Challenges
There are pending RAP payments due to budget constraints
Remarks
The project is complete and operation. Project activates downstream household connections
GPS Coordinates
1.8421° S, 36.7919° E
Funding Sources
Gok
🇰🇪 Domestic
· Grant
KES 41.6M
Wb
🌍 Foreign
· Loan
KES 218.3M
Total
KES 259.9M
Beneficiaries
32,372
Households
161,862
Population
Technical Specs
Volume Abstracted
5,357.00 m³/day
Created 16 Aug 2026, 15:51
· Last updated 16 Aug 2026, 17:18