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HydroDesign

HydroDesign Knowledge Base

Design flood estimation, rainfall analysis, and hydraulic design — documented.
Open the HydroDesign app Browse the methods

Where to start

Section titled “Where to start”
New to the platform? A five-minute tour of the HydroDesign workflow — from picking a location to exporting a report.
Which method should I use? Compare peak-flow methods (Rational, SCS, SDF, Unit Hydrograph, DRH, RMF) and their applicability.
Working with rainfall data Daily rainfall, design rainfall, design storms, ARF and PMP — the rainfall side of the pipeline.
Hydraulic analysis Channels, culverts, GVF profiles, weirs, and reservoir flood routing.

Browse by topic

Section titled “Browse by topic”

About

HydroDesign is a design-flood-estimation SaaS built by Delta Hydro (Pty) Ltd. It combines South African and international hydrological methods with modern GIS and produces engineer-ready Word, Excel, and shapefile deliverables.

Methodological foundations

Section titled “Methodological foundations”

HydroDesign implements methods from the following authoritative references:

  • SANRAL Drainage Manual, 6th Edition (2013) — Rational, Alternative Rational, SCS, SDF, Unit Hydrograph, Empirical methods (QRMF)
  • WR2012 (Water Research Commission) — daily rainfall, design rainfall, depth-duration-frequency relationships
  • Smithers & Schulze (2003) — Design Rainfall Estimation in South Africa
  • USDA TR-55 / NRCS NEH-4 — TR-55 runoff, SCS curve number, time-of-concentration methods
  • USACE EM 1110-2-1420 — reservoir flood routing, hydrograph convolution
  • SANCOLD guidelines — dam safety classification, IDF / SEF / RMF selection

Every article cites its primary references and notes where HydroDesign’s defaults diverge from the source.

Questions?

Section titled “Questions?”

Visit the HydroDesign app to submit a calculation, or email support@deltahydro.tech for help interpreting a result.