B2B hydro-engineering services aligned with the Water Resources Act for Nigerian municipal planning and stormwater management.
Clarifications on regulatory compliance, soil testing, and structural design for municipal projects under the Water Resources Act.
The Water Resources Act (Cap W8 LFN 2004) governs all water abstraction, discharge, and structures affecting flow in Nigeria. For retention basins, Section 4 requires a permit for any works that alter surface or groundwater regimes. Our engineering team handles the permit application and ensures your design meets the National Water Resources Policy standards for stormwater detention and groundwater recharge.
We conduct double-ring infiltrometer tests and Guelph permeameter surveys at multiple depths across the proposed site. The data is used to calculate hydraulic conductivity (Ksat) values, which inform the basin's infiltration rate and sizing. For lateritic soils common in southwestern Nigeria, we also run compaction and grain-size analyses to predict long-term performance.
A full hydro-engineering assessment—including site survey, permeability mapping, regulatory review, and preliminary design—takes 8 to 12 weeks for a standard 2–5 hectare catchment. Larger or multi-site projects may require an additional 4 weeks for environmental impact screening and stakeholder consultations.
Yes. Our reports follow the Nigerian Building and Road Research Institute (NBRRI) guidelines and include all data required by state water agencies: borehole logs, permeability profiles, groundwater depth, and structural recommendations. We also prepare the Environmental Impact Assessment (EIA) trigger checklist if the project exceeds the thresholds in the National Water Resources Policy.
Absolutely. For clay-dominated sites, we recommend subsurface retention galleries with perforated HDPE pipes wrapped in geotextile filter layers. The gallery acts as a storage and slow-release system, reducing peak runoff even when natural infiltration is limited. We have implemented this design in Kano and Oyo states with measured runoff reduction above 30%.
Annual inspection of the monitoring wells and geotextile condition is recommended. Sediment accumulation in the pipe network should be flushed every two to three years using a low-pressure jetting system. We provide a maintenance manual with each project and can schedule routine checks as part of a service agreement.
Our approach combines site-specific soil permeability data with structural engineering standards required under the Water Resources Act, giving municipal clients a defensible basis for retention design.
We run double-ring infiltrometer and Guelph permeameter surveys at every proposed retention location. Generic soil tables from regional maps often overestimate infiltration by 40–60% in lateritic zones; our field data corrects that before the first structural calculation.
Every retention gallery, detention basin, or subsurface drain we plan is checked against Section 4 and Section 12 of the Act. We produce the compliance documentation that municipal engineers need for permit applications, including EIA trigger assessments where required.
Our team has completed permeability mapping for three Lagos watersheds and designed a 2,500 m³ subsurface gallery in Kano that reduced peak runoff by 34%. These are not pilot studies — they are operational systems with 12+ months of monitoring data.
We offer third-party review of retention designs prepared by other engineering firms. Our reports flag inconsistencies between assumed and measured infiltration rates, undersized overflow structures, and gaps in regulatory documentation — before construction begins.
After construction, we install monitoring well arrays and data loggers to track actual infiltration rates, groundwater mounding, and structural settlement. This data feeds back into maintenance schedules and future retention planning, reducing the risk of underperformance.
Our engagement model is built around fixed-scope deliverables: geotechnical survey reports, structural design calculations, regulatory compliance checklists, and as-built monitoring plans. No open-ended consulting — every phase has a defined output and a review gate.