Radar-aided CSO-control-criteria for an ecological approach

1997 ◽  
Vol 36 (8-9) ◽  
pp. 223-228
Author(s):  
A. Petruck ◽  
F. Sperling
Keyword(s):  
Critical Time ◽  
Integrated Approach ◽  
Control Measures ◽  
Real Time Control ◽  
Sewer System ◽  
Time Control ◽  
Physical Measurements ◽  
Combined Sewer ◽  
Receiving Stream ◽  
Control Criteria

The control strategy of a combined sewer system incorporating three stormwater storage tanks with overflows presented here attempts to consider all aspects of acute CSO effects. These are the hydraulic and the composition components as well as the time factor. The result is an integrated approach, which is not based on the classic emission view (i.e. reduction of volume), but on pollution criteria (i.e. possible harm to the biotic community). The aim is to reduce the exceeding of critical peak values of the CSO components at critical time intervals. Control decisions will be based on continuous measurements in the sewer system and in the receiving stream. Furthermore the measurements are carried out to determine the effects (both hydraulic and chemical) of particular CSO discharges in order to evolve the critical values for the project area. The chemical and physical measurements are accompanied by a biological monitoring programme. Macroinvertebrates are sampled upstream and downstream of outfalls and at a reference site. This allows the evaluation of the control measures on an ecological basis, and thus an assessment of the ecological potential of radar-aided real-time control of the combined sewer systems.

Monitoring runoff conditions in a combined sewer system: experience and results of ten years' application

1996 ◽  
Vol 33 (1) ◽  
pp. 257-264
Author(s):  
M. Weyand
Keyword(s):  
Monitoring System ◽  
Pilot Project ◽  
Actual Condition ◽  
Real Time Control ◽  
Sewer System ◽  
Time Control ◽  
Combined Sewer ◽  
Complete Breakdown ◽  
Short Time ◽  
Detention Facilities

To get knowledge about the runoff, storage and combined sewer overflow (CSO) conditions since 1985 a measuring and monitoring system is working in the sewer network of the community Ense-Bremen (near Dortmund). Within this semi-urban catchment seven detention facilities are fitted out with devices for monitoring information about basin outflow, grade of volume and CSO. Since October 1986 the determined data are also used for the real-time control of that sewerage. Since its installation the monitoring system works rather satisfyingly. Especially the operating staff use its possibilities to get information about the actual condition of the sewer system. Thus, differences to the normal runoff conditions can be realised in very short time. That allows an immediate reaction in order to clear malfunctions or errors as well. However, within the ten years there have also occurred some failures at the measuring devices caused by different reasons up to a complete breakdown of the whole system during thunder-storms. All in all the results of that pilot project have been positive and are now the basis for the equipment of further detention facilities in other sewer systems with monitoring devices.

Real Time Control in Part of Copenhagen

1993 ◽  
Vol 27 (12) ◽  
pp. 209-212 ◽  
Author(s):  
Jørgen Jens Linde-Jensen
Keyword(s):  
Real Time ◽  
Storage Capacity ◽  
Combined Sewer Overflow ◽  
Real Time Control ◽  
Sewer System ◽  
Time Control ◽  
Combined Sewer ◽  
Sewer Overflow

The application of real-time control to the sewer system in a district of Copenhagen is described. It enables the storage capacity of the sewer system to be better utilised, thus minimizing combined sewer overflow pollution.

REAL TIME CONTROL OF THE COMBINED SEWER SYSTEM IN CINCINNATI, OHIO

2003 ◽  
Vol 2003 (8) ◽  
pp. 559-579
Author(s):  
Brian Joyner ◽  
Edward Speer ◽  
Ralph Johnstone ◽  
Edward Burgess ◽  
Z. Cello Vitasovic
Keyword(s):  
Real Time ◽  
Real Time Control ◽  
Sewer System ◽  
Time Control ◽  
Combined Sewer ◽  
Combined Sewer System

Stochastic Modeling of Combined Sewer Flows

1991 ◽  
Vol 24 (6) ◽  
pp. 35-40 ◽  
Author(s):  
Shuhai Zheng ◽  
Vladimir Novotny
Keyword(s):  
Daily Rainfall ◽  
Real Time Control ◽  
Combined Sewer Overflows ◽  
Sewer System ◽  
Flow Models ◽  
Stochastic Nature ◽  
Time Control ◽  
Combined Sewer ◽  
Identification Techniques ◽  
Good Agreement

Modeling of sewer flow and quality is essential for real-time control (RTC) of sewer system and minimization of combined sewer overflows (CSOs). In this paper, the Box-Jenkins type transfer function is applied to the daily rainfall and sewer flow data to incorporate the stochastic nature of the rainfall and flow series. Two system identification techniques, different from the traditional Box-Jenkins', approach, are developed to identify sewer flow models. Both techniques are illustrated through their application of modeling sewer flow with actual time series of flow and rainfall from a combined sewer system. The onestep ahead predicted flow values are found to be in good agreement with the measured values.

Effet de la propagation non linéaire des débits sur le contrôle en temps réel des débordements de réseaux unitaires

1989 ◽  
Vol 16 (2) ◽  
pp. 119-123
Author(s):  
Lucie Wilson ◽  
Denis Isabel ◽  
Jean-Pierre Villeneuve
Keyword(s):  
Real Time ◽  
Linear Models ◽  
Control Strategies ◽  
Real Time Control ◽  
Sewer System ◽  
Prediction Horizon ◽  
Time Control ◽  
Combined Sewer ◽  
Combined Sewer System ◽  
Propagation Non Linéaire

A number of reports on simulations of real-time control of combined sewer system runoff have been published. Most of the control strategies suggested use linear models to calculate discharge routing. We used a nonlinear model for discharge routing and some of our findings differ from those obtained in earlier studies. In particular, it appears that the prediction horizon used for control optimization could be favourably shorter than the time of system flow-through. Key words: combined sewer system overflow, real-time control, nonlinear programming, discharge propagation. [Journal translation]

A Network Algorithm for the Optimum Operation of Urban Drainage Systems

1991 ◽  
Vol 24 (6) ◽  
pp. 209-216 ◽  
Author(s):  
K. Neugebauer ◽  
W. Schilling ◽  
J. Weiss
Keyword(s):  
Linear Programming ◽  
Control System ◽  
Network Optimization ◽  
Optimization Problem ◽  
Urban Drainage ◽  
Real Time Control ◽  
Sewer System ◽  
Time Control ◽  
Sewer Systems ◽  
Combined Sewer

The objective is to route sewage through a combined sewer by means of a real time control system. The task is formulated as a mathematical network optimization problem. The sewer system is simplified to be a set of linearly operating nodes and arcs. Tests indicate that the results obtained are comparable to linear programming solutions. However, much larger systems can be handled. The algorithm is fast enough to have it applied on AT-PC's for real world sewer systems.

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