1. General Model Information

Name: a stochastic software tool for assessing impacts of urban drainage on receiving waters

Acronym: REBEKA2

Main medium: aquatic
Main subject: hydrology, (eco)toxicology
Organization level: Ecosystem
Type of model: Monte Carlo simulation, other, difference equations (1D),
Main application: screening tool, research, simulation/optimisation tool
Keywords: Combined sewer overflow, model uncertainties, Monte Carlo simulation, receiving water, stochastic modelling, urban drainage


Rolf Fankhauser
Fankhauser GEP Data Consulting, Murbacherstr.34,
CH-4056 Basel,

Phone: ++41-(0)61-321-20-91
email: rolf.fankhauser@gepdata.ch


Rolf Fankhauser, Simon Kreikenbaum, Wolfgang Rauch, Luca Rossi, Vladimir Krejci


REBEKA is a software tool that has been developed to assess impacts of urban drainage to receiving waters based on immission criteria. The program calculates the average number of critical events per year for NH3 pollution and riverbed erosion caused by urban storm water overflows for a given catchment. It is already widely used by Swiss practitioners in processing the receiving water status report of the master plan of urban drainage. REBEKA is now extended to REBEKA II by (1) a stochastic model which simulates input, transport and emission of total suspended solids (TSS) by the drainage system and their immission in the receiving water and (2) by stochastic modelling in general: each model parameter is treated as a random variable with a specific mean value, variation and probability distribution. Different probability distributions are available. The probability distribution of model outputs (i.e. number of critical events for ammonia toxicity and riverbed erosion, TSS lo!
ad and time of critical TSS immission) is calculated by means of a Monte Carlo simulation. To determine the importance of the model parameters to the output variables a local sensitivity analysis is implemented.

II. Technical Information

II.1 Executables:

Operating System(s): Windows

II.2 Source-code:

Programming Language(s): C++, Delphi

II.3 Manuals:

see: REKEKA Homepage

II.4 Data:

see: REKEKA Homepage

Necessary data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

Rauch W., Krejci V. and Gujer W. (2002). REBEKA - a software tool for planning urban drainage on the basis of predicted impacts on receiving water. Urban Water, 4: 355-361.

Kreikenbaum S. Krejci V., Rauch W. and Rossi L. (2002). Probabilistic modeling as a new planning approach to stormwater management. 9th ICUD (International Conference on Urban Drainage), Portland (Oregon), USA.

Fankhauser R., Kreikenbaum S., Krejci V., Rossi L., Rauch W. (2004). Rebeka II a stochastic software tool for assessing impacts of urban drainage on receiving waters. 6th Int. Conf. on Urban Drainage Modelling (UDM), pp. 175-184, Dresden, Germany

Rossi L., Krejci V., Rauch W., Kreikenbaum S., Fankhauser R. and Gujer W.(2005).Stochastic modeling of total suspended solids (TSS) in urban areas during rain events. Water Research 39(17):4188-4196

V. Further information in the World-Wide-Web

VI. Additional remarks

Last review of this document by: : Wed Feb 1 20:21:36 2006
Status of the document: Contributed by Rolf Fankhauser
last modified by Joachim Benz Wed May 10 11:31:09 CEST 2006

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