SUDPLAN Linz Pilot Report V2

This document is the second status report of the Linz Pilot Application. The document summarizes the general objectives of the Linz Pilot Application for the 2nd year of the SUDPLAN project. It reports on the implementation status including preparatory work
performed regarding the local model used and the installation of the used sensor network. The software that has been finally used in the context of the Linz Pilot Application is described to provide an overview of the currently available functionality. In case of GUIs (Graphical User Interfaces) software is documented in the form of screenshots. In case of services and APIs a technical specification is given in chapter 5.2. The implementation status is mapped to tasks and use cases to give an impression on the progress made. In addition, a separate paragraph reports on the End User involvement in WP7. So far considerable progress has been achieved and the software (with enhancements and additional features) will go live in the course of 2012.

Besides, after the decision of LINZ AG to provide the project with some additional funding a sensor network was installed and taken into operation in late 2011. The goals, the design and the installation of the sensor network are also described in this document.

Objectives

Urban drainage systems form a valuable backbone of urban infrastructure. On average, it is estimated that the value of the urban wastewater system is about 300 Mio € per 100.000 inhabitants. In many European cities waste water and storm water are drained in one sewerage system (“combined systems”). Thus the urban wastewater system is very vulnerable to potential climate change impacts, particularly to a potential increase of extreme flood events and more spilled out pollution loads to receiving waters. Due to the hydraulic limitation of waste water treatment plants (WWTPs) it is not possible to treat the whole amount of drained water at WWTPs; thus the runoff in combined sewer systems has to be either discharged at combined sewer overflows (CSO) into receiving waters or temporarily stored in reservoirs. CSO facilities can be designed with a retention volume (“CSO tank”) in order to mitigate overflow events
during heavy rains. CSO tanks also show considerable capacities to hold back the TSS (Total Suspended Solids) and COD (Chemical Oxygen Demand) loads in waste and storm water which are the key parameters to describe and quantify the transported pollution loads in sewer systems.

In scope of the SUDPLAN project, three main tasks will be carried out within the Linz pilot:

1. Develop and set up an information system based on WP3 and WP4 results that incorporates common services and local model components to:
2. Estimate the overall CSO efficiency rates n for dissolved pollutants (nd) and for particulate pollutants (np) in the total catchment area of the WWTP of Linz based on long-term simulations and future predicted rain data provided by the common services (Phase 1).
   By comparing the results of today’s and of future scenarios possible effects and changes can be recognised and located and proper strategic adaptations can be developed within the catchment area in time.
3. Estimate the sedimentation efficiency rate nsed for the primary clarifiers of the WWTP inLinz by the installation and operation of a novel sensor network in the inflow and outflow of the primary clarifiers in order to quantify the TSS and COD retention efficiency under different rainwater flow regimes (Phase 2).