The Flood Specialists
Floodline and flood risk engineering for South Africa
Delta Hydro Engineers (Pty) Ltd delivers defensible floodline determinations, flood risk assessments, and stormwater management plans for developers, municipalities, and consulting engineering firms — plus flood exposure work for insurers and the custom software that water teams actually use.
Not sure of scope yet? Just tell us about your site — no obligation, and we reply within one business day.
Stellenbosch · 33° 56′ S 18° 51′ E · SANS 10400-H · DWS
Three pillars, one practice
We are a hydrology and hydraulics practice that does three things — and is honest about which of them are services delivered by our team today, and which are platforms we are still building.
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01 · Consulting
Consulting
Defensible hydrology, hydraulics, and stormwater studies for South African projects.
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02 · Flood risk
Flood Risk Intelligence
Flood maps and flood risk assessments for any area of South Africa, built on local rainfall and gauge records.
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03 · Software
Custom Software
QGIS plugins, dashboards, and bespoke water-engineering applications.
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Who we work with
Pick the audience closest to you and we will surface the offerings most relevant to that work — from consulting services through to flood risk intelligence and custom software.
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Floodlines & Stormwater for Developers
Floodlines, SMPs, and flood risk advice for South African property developers at rezoning, planning, and detailed-design stages.
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Stormwater & Flood Services for Municipalities
Stormwater management plans, floodline determinations, and flood hazard mapping for South African municipalities.
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Sub-consultancy for Consulting Engineering Firms
Specialist hydrology, hydraulics, and flood modelling capacity for consulting engineering firms on a sub-consultancy basis.
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Drainage & Flood Studies for Roads & Rail
Drainage, culvert design, scour protection, and flood studies for roads and rail corridors in South Africa.
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Flood Risk Intelligence for South African Insurers
Flood maps, property scores, portfolio exposure, claims evidence and post-event loss estimates for South African insurers, built on local rainfall and gauges.
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Water Management for Mining Operations
Mine water balances, TSF studies, pit dewatering, and flood studies for South African mining operations.
Flood risk intelligence
Flood maps and flood risk assessments for any area of South Africa, built from local rainfall and stream gauge records on 5 m terrain, for insurers, lenders, developers, municipalities and infrastructure owners.
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Claims Dispute Support
Independent, defensible hydraulic evidence for contested flood claims. Modelled extents at the date of loss, delivered as an expert report with GIS backing.
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Flood Hazard Mapping
Depth-and-velocity flood hazard layers for insurers, engineers, and municipalities. Scoped engagement: GIS layers, methodology report, and reviewer brief.
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Portfolio Exposure Quantification
Run a portfolio against our hazard layers. Expected annual loss, accumulation, and concentration metrics as a report plus data files — no black-box.
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Post-Event Loss Modelling
Rapid flood footprint and portfolio loss estimate after a significant event. Scoped engagement for reinsurance reporting and reserve-setting timelines.
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Property-Level Flood Risk Scoring
Flood score, return-period depths and supporting evidence for a South African address: per report, as batched data, on our platform or through an API.
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Flood maps and flood risk data
The flood model behind every offering: terrain, rainfall, calibration, outputs and coverage.
Featured consulting services
Each service page documents methodology, deliverables, South African standards context, and FAQs — so your reviewer, regulator, or peer can trace what we did and why.
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Floodline Determination
1:100-year floodlines for rezoning, township layouts, mines and water use licences, signed by a registered engineer. Typical programme: 6 to 12 weeks.
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Flood Risk Assessment
Quantified flood risk for developers, mines, and public-sector projects. Clear scenarios & mitigation options. Request a quote — Delta Hydro Engineers.
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Stormwater Management Plans
Catchment-ready stormwater management plans for municipal approvals, WSUD, and buildable controls. Delta Hydro Engineers — request a quote.
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Hydraulic Modelling
1D/2D hydraulic modelling with HEC-RAS & MIKE for floodlines, structures, and consequence mapping. Delta Hydro Engineers.
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Mine Water Management
Integrated runoff, pond & return-water planning for mines and TSFs. Compliance-focused hydrology — Delta Hydro Engineers.
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Dam Safety Evaluations
Hydraulic inputs for dam safety evaluations aligned to SANCOLD expectations & DWS context. Delta Hydro Engineers — SA.
Knowledge Centre
Explainers & free calculators
How return periods, the Rational Method, design rainfall, and terrain data actually work in South African practice — plain-language explainers by our engineers, plus free screening calculators for time of concentration, flood risk, and peak flows.
Latest from the blog
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Building Near a River in South Africa: Every Law That Applies to Your Site
Which South African laws apply to a site next to a river, what each triggers and who decides: water use, environmental, building, mining, dams and coast.
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How to Check if a Property Is in a Floodline: Municipal Flood Maps, City by City
Where South African municipalities publish floodlines and flood maps, what those maps cannot tell you, and when only a floodline study will answer.
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Floodline, Riparian Zone, 32 m or 100 m? The Lines That Control Building Near a River
The 1:100 floodline, the regulated area, the 32 m rule and municipal buffers come from four different laws. What each line controls near a river.
Sectors and standards
Who our consulting work serves
Greenfield and infill residential and commercial developers, open-pit and underground mining houses, district and metropolitan municipalities, roads and rail environments, and consulting firms that need specialist hydrology or hydraulic modelling capacity on a sub-consultancy basis.
South African context
Our work routinely references SANS 10400-H, municipal stormwater and flood line policies, SANRAL drainage guidance where applicable, and DWS flood line and water-use processes — always tied to the specific site, catchment, and receiving environment you are working in.
Where we work
We support projects nationwide and prepare location-specific briefs for major centres. Each city hub links to every consulting discipline we offer, with introductory context for that region's climate, topography, and typical authority questions.
Tell us the geography, the audience, and the problem you are trying to solve. We will tell you what we can deliver today, what is on the roadmap, and what a scoped proposal looks like.
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