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Monthly Archives: January 2026

Blinding of excavated trench for 0.9m x 1.2m (varying depth) open channel drain at Ogagifo Street, CH 0 + 45.

A behind-the-scenes look at the manhole sequencing system and its purpose in inspection, maintenance, and emergency planning

Posted on 31 January 2026 - 12:58 am by

Manhole Numbering Systems: What They Reveal About Sewage Network Planning and Maintenance in Asaba, Nigeria By John Cee Onwualu (FNSE, FNICE, FNIWE, P.E., R.ENG, MASCE) The rapid urbanization of Asaba, the capital of Delta State, Nigeria, has brought with it an urgent need for sophisticated infrastructure management. As the city expands along the banks of […]