GCS offers services to analyse and measure rainfall, run-off and other climatic conditions to provide a better understanding of the hydrological cycle as well as surface water and run- off patterns. Run-off can be modelled for differing locations and conditions. Potential floods and flood lines are calculated and mapped. Conceptual or preliminary designs are produced for the planning of dams, irrigation schemes, drains, channels, berms or levees. Surface Water Hydrology measures and models conditions that exist and
facilitates the development of dam simulations, the design of flood control and storm water management measures and
the planning of irrigation, water supply and other water resource development projects.

Hydrology services offered include:

  • Surface Water Specialist Studies as part of a:
  • Environmental Impact Assessment (EIA) and Environmental and Social
    • Impact Assessment (ESIA);
    • Water Use License Application (WULA);
    • Integrated Water and Waste Management Plan (IWWMP)
    • Pre-Feasibility Study (PFS); and
    • Feasibility Studies (FS) (Bankable).
  • Water Management and Planning
    • Static, Dynamic and Probabilistic Water Balance Modelling for Water Management Planning using the GoldSim Simulation Package; and
    • Storm Water Management Planning using PCSWMM software.
  • Analysis of Climatic Conditions and Climate Change Analysis ;
  • Run-off Modelling and Analysis at a Catchment (wide or small scale);
  • Water Demands, Downstream Use and Supply Risk Analysis;
  • Irrigation Assessments;
  • Flood Risk and Management:
    • Peak Flood Determination; and
    • Determination and Mapping of Flood Lines.
  • Surface Water Risk and Mitigation Analyses; and
  • Integrated Surface Water, Groundwater, Soils and Wetland Calculations.

These basic hydrological services are supplemented by specific services offered to clients in different economic sectors. Packages of services are specifically tailored to the individual requirements of clients.

The GCS Hydrology Unit works closely together with the Environmental Engineering Unit and Systems, Irrigation, Water Supply Systems, Canals and Pipelines and has worked in many countries throughout Africa. also has experience in planning and providing inputs into the design of Municipal Waste Water .


2017Johannesburg City ParksResearch Assessment for Rainwater Harvesting across 7 Johannesburg Park RegionsJohannesburg, South Africa
2017Eurasian Resources GroupComide Copper Mine Bankable Feasibility Study - Hydrology and hydrogeologyKolwezi, Democratic Republic of Congo (DRC)
2017Tendele Mining (Pty) LtdWater Supply Assessment for the Somkhele Pit Lake
Mtubatuba, South Afirca
2016Exxaro Coal Mpumalunga (Pty) LtdUpdate Water Balance Model of the Belfast
Implementation Project for Final Design Input
Belfast, South Africa
2016DRA Projects (Pty) LtdMorupule Coal Mine Feasibility and FEED Phase
Study – Surface Wate
Palapye, Botswana
2016Environmental Impact Management Services (Pty) LtdHydrological Assessment for the Molopo Gas ProjectWelkom, South Africa
2015ASEDA EngineeringSteynsrus Town Water Availability AssessmentSteynsrus Town, South Africa
2015Makhaotse, Narasimulu and Associates (Pty) LtdWater Supply Assessment for the Proposed
Charlestown Bulk Water Supply Project
Charlestown, South Africa
2014Horizon InvestmentsIdentification of Potential Hydro Power Stations in
Northern Zambia
Northern Zambia, Zambia
2014Transnet SOC LtdStorm Water Management and Water Quality Planning
for the Germiston Train Depot
Germiston Train Depot, South Africa
2014ENRC Mozambique LimitadaEstima Mozambique Mine Feasibility Study - Surface
Water Assessment
Moatize, Mozambique
2014Kangra Coal (Pty) LtdKangra Mine Storm Water Management Plan and
Water Balance Assessment
Piet Retief, South Africa
2014DRA Projects (Pty) LtdMolo Graphite Bankable Feasibility Study - Hydrology
and Hydrogeology
Fotadrevo, Madagascar
2013Airports Company South Africa SOC LtdKing Shaka International Airport Surface Water
Quantity and Quality Study
King Shaka International Airport, South Africa
2012Blastrite (Pty) LtdPhilippi Silica Sand Mine - Storm Water Management
and Rehabilitation Plan
Cape Town, South Africa
2012Scorpion Mineral Processing (Pty) LtdAngola Mine Bankable Feasibility Study - Surface
Water Assessments
2012Scanza Properties (Pty) LtdDreamland Piggery - Water Balance and Storm Water
Management Plan Study
Vanderbijlpark, South Africa


  1. Surface Water Hydrology (680.8 KB)
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