Chapter 3 : Reservoir models - KU Leuven

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Figure 3.30 : Schematic representation of the reservoir model for the sewer system and treatment plant of Dessel. 3.34 The influence of rainfall and model simplification on combined sewer system design
For emission modelling it is very important to obtain the results in a statistically processed way. It would require too much disk space and writing time to write all results at every time step into a file. The user can choose to write the time step results for one year into a file, but it is more important to obtain processed results. Therefore, the overflow events are individually written to a file using parameters as starting time, duration, overflow volume, mean overflow discharge and peak discharge (during the time step, i.e. 10 minutes). The overflow ‘events’ can be defined as individual events or as days with an overflow event. Average values per year, per month (over all the years) and for the whole simulation are given. To obtain a rough estimation of the deviation on the results the 68 %-intervals are also given. The peak overflow discharges seem to fit very well to a lognormal distribution. The overflow volumes and durations seem to tend more to an exponential distribution. This check for the type of distribution for the overflow parameters was only carried out on a limited number of time series and cannot be generalised. Furthermore, there could be a possible effect of the definition of an overflow event on the distributions for the overflow volumes and durations. When this statistical information will be used, further research on the type of distributions should be performed. Finally, a file with the volume balance is written in order to check the total volumes that have passed the reservoirs. In appendix B.2 some examples of results are shown. Chapter 3 : Reservoir models 3.35
Page 1 and 2: Chapter 3 : Reservoir models 3.1 Hi
Page 3 and 4: In this figure 3.3 the constant thr
Page 5 and 6: 3.2.2 Concentration time As was alr
Page 7 and 8: (implemented) concentration time of
Page 9 and 10: In figure 3.7 the storage in the sy
Page 11 and 12: 200 175 150 125 100 75 50 25 0 thro
Page 13 and 14: The influence of the simplification
Page 15 and 16: Figure 3.14 : Longitudinal profile
Page 17 and 18: 1.2 throughflow (m 3 /s) 1 0.8 0.6
Page 19 and 20: Also for combined sewer systems the
Page 21 and 22: 3.2.4 Runoff models After the calib
Page 23 and 24: instantaneous runoff coefficient 1
Page 25 and 26: Other more detailed runoff models c
Page 27 and 28: 3.3 The reservoir modelling system
Page 29 and 30: If the concentration time is not ta
Page 31 and 32: 200 throughflow Q (l/s) 175 real re
Page 33: 3.3.3 Other features The reservoir
Page 37 and 38: Figure 3.31 : Overflow frequencies
Page 39 and 40: Figure 3.33 : Overflow volumes (% o
Page 41 and 42: Not only the storage, the throughfl
Page 43 and 44: As the overflow events are strongly
Page 45 and 46: 16 peak overflow discharge (mm/h) 1

Chapter 3 : Reservoir models - KU Leuven

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