Hydra Ring 20.1 : probabilistic toolbox for the BOI : technical reference manual

Hydra-Ring is het probabilistische rekenhart van Riskeer, het instrument voor de beoordeling en het ontwerp van primaire waterkeringen in Nederland. Dit document geeft de wetenschappelijke onderbouwing van de gebruikte methode in Hydra-Ring.
Dit document is de laatste jaarlijkse update van een rapport uit 2013 Hydra-Ring Scientific Documentation, Deltares & TNO-Bouw. Deltares rapport 1206006-004. Auteur Ferdinand Diermanse Kathryn Roscoe Juliana Lopez de la Cruz Henri Steenbergen, Ton Vrouwenvelder. Dit document is in de loop der jaren aangepast/aangevuld door Wim van Balen, Wouter Jan Klerk en Karolina Wojciechowska bij Deltares en HKV Lijn in Water. Rijkswaterstaat, Robert Slomp is de opdrachtgever voor dit document en de software Hydra-Ring en Riskeer (voorheen Ringtoets). Diverse reviews op dit document zijn uitgevoerd door Robert Slomp en Marcel Bottema (Rijkswaterstaat) en Chris Geerse (HKV lijn in Water).

This document describes the scientific background of Hydra-Ring, a probabilistic model used for the computation of failure probabilities for interconnected systems of flood defences. It includes background on the probabilistic techniques, the way in which the statistics and correlations of the hydraulic load and strength variables are handled, and the built-in failure mechanism models. The current version of this document is a preliminary work-in-progress document that is largely intended for developers and programmers in the development phases of Hydra-Ring. The first version was published in 2013.
The most relevant topics in the scientific documentation are the probabilistic techniques, including techniques for combining failure probabilities, the correlation models which are used to describe the interdependence of load variables, the statistical distributions which are used to describe the load and strength variables, and the description of hydraulic load models. Examples of load models in the Netherlands are presented in appendix. Over time the PC-ring code (a program for research purposes) has been removed and replaced.