scholarly journals Optimal control of combined sewer systems using SWMM 5.0

Urban Water ◽  
2012 ◽  
Author(s):  
U. S. Rathnayake ◽  
T. T. Tanyimboh
Keyword(s):  
Optimal Control ◽  
Sewer Systems ◽  
Combined Sewer

Control Logic for Real Time Control of Flow in Combined Sewers

1974 ◽  
Vol 9 (1) ◽  
pp. 217-234 ◽  
Author(s):  
W. Bell ◽  
G. Johnson ◽  
C. B. Winn
Keyword(s):  
Optimal Control ◽  
Control Strategy ◽  
Real Time Control ◽  
Control Logic ◽  
Optimal Control Strategy ◽  
Time Control ◽  
Sewer Systems ◽  
Combined Sewer ◽  
Control Of Flow

Abstract This paper presents a method for determining an optimal control strategy for the real time control of flow in combined sewer systems. The objective of this control is to minimize weighted flow diversions from the sewer system to the receiving waters during storm periods. The elements of a control system for combined sewers are described first. This is followed by a development of a reservoir model for combined sewer systems having weir and orifice controls at the regulator structures. An example, verified by the variational calculus, is given of an optimal control strategy that will minimize the weighted overflows from a system of three reservoirs. Examination of this optimal strategy and others presented in the literature shows that the optimal control strategy for this type of problem typically falls on constraint boundaries and includes jumps in the orifice controls from maximum to minimum positions. By formulating these common operating procedures into a set of rules it is shown that if the times at which the jumps in the orifice controls occur are known, then for a given set of inflow hydrographs the control strategy is completely defined. The determination of an optimal control is then reduced to finding the optimal times for the jumps in the orifice controls to occur. A procedure for this optimization is outlined and the results of its application to a system of ten reservoirs are presented. It is concluded that the method presented for the determination of an optimal control logic would be suitable for a system containing up to twenty control points and would ensure maximum utilization of available system storage capacity.

Methods for Calculation of Annual and Extreme Overflow Events from Combined Sewer Systems

1984 ◽  
Vol 16 (8-9) ◽  
pp. 311-325 ◽  
Author(s):  
N B Johansen ◽  
P Harremoës ◽  
M Jensen
Keyword(s):  
Extreme Event ◽  
Short Term ◽  
Sewer Systems ◽  
Extreme Load ◽  
Combined Sewer ◽  
Receiving Waters ◽  
Water Problems ◽  
Source Of Pollution ◽  
Receiving Water

Overflow from combined systems constitute an increasing source of pollution of receiving waters, as compared to daily wastewater discharges which undergo treatment to a still higher extent. The receiving water problems from overflows are significant both in a long term scale (mean annual load) and in a short term scale (extreme event load). A method for computation of both annual and extreme load is presented. It is based on historical rain series and the use of a time-area model and simple pollutant mixing model in runoff calculation. Statistical calculations for both mean annual load and extreme events have been applied to the computed overflow series. Based on the computerized method simple manual calculations methods have been developed, resulting in graphs and tables for annual load and extreme load.

Methods for studying dissolved oxygen levels in coastal and estuarine waters receiving combined sewer overflows

1995 ◽  
Vol 32 (2) ◽  
pp. 95-103
Author(s):  
José A. Revilla ◽  
Kalin N. Koev ◽  
Rafael Díaz ◽  
César Álvarez ◽  
Antonio Roldán
Keyword(s):  
Dissolved Oxygen ◽  
Coastal Waters ◽  
Computational Cost ◽  
Oxygen Deficit ◽  
Alternative Methods ◽  
Coastal Zones ◽  
Combined Sewer Overflows ◽  
Sewer Systems ◽  
Combined Sewer ◽  
High Computational Cost

One factor in determining the transport capacity of coastal interceptors in Combined Sewer Systems (CSS) is the reduction of Dissolved Oxygen (DO) in coastal waters originating from the overflows. The study of the evolution of DO in coastal zones is complex. The high computational cost of using mathematical models discriminates against the required probabilistic analysis being undertaken. Alternative methods, based on such mathematical modelling, employed in a limited number of cases, are therefore needed. In this paper two alternative methods are presented for the study of oxygen deficit resulting from overflows of CSS. In the first, statistical analyses focus on the causes of the deficit (the volume discharged). The second concentrates on the effects (the concentrations of oxygen in the sea). Both methods have been applied in a study of the coastal interceptor at Pasajes Estuary (Guipúzcoa, Spain) with similar results.

Methods of Estimating the Discharge of Gross Solids from Combined Sewer Systems

1992 ◽  
Vol 26 (5-6) ◽  
pp. 1295-1304 ◽  
Author(s):  
C. Jefferies
Keyword(s):  
Research Centre ◽  
Combined Sewer Overflows ◽  
Water Research ◽  
Sewer Systems ◽  
Combined Sewer ◽  
Sewer Overflows ◽  
The Uk

Visible pollution discharged from two combined sewer overflows were studied using passive Trash Trap devices and the UK Water Research Centre Gross Solids Sampler. Relationships are presented for the number of visible solids and the mass of gross solids discharged during an event. The differences in the behaviour of the overflow types are reported on and they are categorised using the Trash Traps.

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