Integrated management and modelling in urban drainage systems: the potentialities in a developing megacity Juan Pablo Rodríguez, M. A. Díaz-Granados, M. S. Rodríguez, S. A. Fonseca, G. L. Mestra, J. C. Penagos, Č . Maksimovi ć and N. McIntyre Environmental and Water Resource Engineering – EWRE Urban Water Research Group - UWRG Imperial College London WWW-YES- 2009, 8th Word Wide Workshop for Young Environmental Scientists, 2-5 June 2009, Paris Overview • Introduction - Background/Context - General Aims & Objectives - Brief background to the case studies • Analysis to be performed – Knowledge gaps • Model developments & Initial results • Future work WWW-YES- 2009, 8th Word Wide Workshop for Young Environmental Scientists, 2-5 June 2009, Paris
Background/Context • Accelerated urbanization in developing countries • Conflictive water services: water supply, drainage, sewage collection and treatment, and receiving water uses • Pressures on urban water systems (water balance & water quality) • Effective management of UDS = scientific understanding of their impacts WWW-YES- 2009, 8th Word Wide Workshop for Young Environmental Scientists, 2-5 June 2009, Paris Background/Context • UWWS: sewer system – WWTP – river • UWWS have been designed, operated and improved as separate entities • Potential benefits of a holistic management ( Developing countries) - Key role of simulation models • ↓ pollutants discharged into the receiving system • Sewer solids provide a transport matrix for different pollutants WWW-YES- 2009, 8th Word Wide Workshop for Young Environmental Scientists, 2-5 June 2009, Paris
General Aims & Objectives • Bogotá (Colombia) is a prime example of a mega-city demanding an integrated management of water resources • Development and application of appropriate modelling tools at different levels of detail • Integrated UDS modelling framework (Bogotá, …) • City Drain toolbox + Case study from Europe (Linz, Austria) • Two different scales: sub-catchment and macro-modelling scales WWW-YES- 2009, 8th Word Wide Workshop for Young Environmental Scientists, 2-5 June 2009, Paris Background to case studies - Bogotá WWW-YES- 2009, 8th Word Wide Workshop for Young Environmental Scientists, 2-5 June 2009, Paris
Background to case studies Bogotá • 7 million inhabitants, around 330 km 2 of urban area • Storm and WW systems with a large number of wrong connections • Wastewater and CSO discharges into the rivers • DWF 17 m 3 s -1 vs. WWT system capacity 4 m 3 s -1 • The Bogotá River with a mean flow of 10 m 3 s -1 has a 60 km anaerobic stretch WWW-YES- 2009, 8th Word Wide Workshop for Young Environmental Scientists, 2-5 June 2009, Paris Analysis to be Performed 1. Sub-catchment scale Performance How the complexity of the storm Modelling Approach Complexity i water quality model and the level Δ P Modelling Approach of spatial detail of the sewer Complexity n system affect the overall Decreasing predictability and robustness? Complexity Δ DL Detail Level Methodology Optimum i Optimum n Comparative modelling between study cases - “El Virrey” experimental sub- Uncertainty and sensitivity catchment analysis - Linz WWW-YES- 2009, 8th Word Wide Workshop for Young Environmental Scientists, 2-5 June 2009, Paris
Analysis to be Performed 2. Macro-modelling scale - Combined or separated systems? How wrong connections affect the system performance Methodology - Bogotá Case WWW-YES- 2009, 8th Word Wide Workshop for Young Environmental Scientists, 2-5 June 2009, Paris SUPPORTING DATA AND TOOLS FOR INTEGRATED MODELLING – THE BOGOTÁ CASE RECEIVING SYSTEM SEWER WWTP Experimental subcatchment Input pollutant loads to El Bogotá river water quality El Virrey (Uniandes, 2001) Salitre WWTP (Rodríguez et modelling (Camacho et al., al., 2008) 2002) Wastewater DWF patterns (Díaz-Granados et al., 2008) Water quality modelling of three urban rivers - Salitre, Domestic and industrial Fucha and Tunjuelo (Raciny CITY DRAIN toolbox – Fuzzy wastewater loads (Uniandes et al., 2008) logic techniques in order to - SDA, 2008) assess CSO performance WQO for four urban rivers: (Fonseca et al., 2008) GIS – based tool for Torca, Salitre, Fucha y identifying wrong Tunjuelo (Uniandes - SDA, connections likelihood Implementation of the 2008) (Mestra, 2008) Bogotá’s urban drainage system using CITY DRAIN GIS – based tool for (Rodríguez et al., 2008) estimating sediment accumulation rates (Uniandes - EAAB, 2008) WWW-YES- 2009, 8th Word Wide Workshop for Young Environmental Scientists, 2-5 June 2009, Paris
Supporting data and tools GIS – based tool for identifying wrong connections likelihood (Mestra, 2008) WWW-YES- 2009, 8th Word Wide Workshop for Young Environmental Scientists, 2-5 June 2009, Paris Supporting data and tools GIS - based tool for estimating sediment accumulation rates (Uniandes - EAAB, 2008) WWW-YES- 2009, 8th Word Wide Workshop for Young Environmental Scientists, 2-5 June 2009, Paris
Supporting data and tools El Virrey storm water channel CITY DRAIN toolbox – Fuzzy logic techniques in order to assess CSO performance (Fonseca et al., 2008) WWW-YES- 2009, 8th Word Wide Workshop for Young Environmental Scientists, 2-5 June 2009, Paris Supporting data and tools Bogotá’s urban drainage system esquemtization to be implemented using the CITY DRAIN toolbox (Uniandes, 2009) WWW-YES- 2009, 8th Word Wide Workshop for Young Environmental Scientists, 2-5 June 2009, Paris
Initial results Subcatchment scale WWW-YES- 2009, 8th Word Wide Workshop for Young Environmental Scientists, 2-5 June 2009, Paris Initial Results 1.6 Q measured Q simulated 1.4 E = 0.9525 1.2 1 Q (m3/s) 0.8 0.6 0.4 0.2 0 200 400 600 800 1000 1200 1400 Time [minutes] 1000 Measured 900 Measured Simulated Simulated 900 800 E = 0.6191 E = 0.6191 800 700 700 600 600 TSS (mg/l) TSS (mg/l) 500 500 400 400 300 300 200 200 100 100 0 0 200 400 600 800 1000 1200 1400 950 1000 1050 1100 1150 1200 Time [minutes] Time [minutes] Rainfall runoff and TSS modelling at Caracas 77 – 8 May 2001 Best predictions WWW-YES- 2009, 8th Word Wide Workshop for Young Environmental Scientists, 2-5 June 2009, Paris
Initial Results 1.4 Q measured Q simulated 1.2 E = 0.9019 1 0.8 Q (m3/s) 0.6 0.4 0.2 0 200 400 600 800 1000 1200 1400 Time [minutes] Model output and associated confidence limits (UCI=0.95, LCI=0.05) Model output and associated confidence limits (UCI=0.95, LCI=0.05) 2500 3500 E = 0.3443 3000 E = 0.3443 2000 2500 1500 TSS (mg/l) TSS (mg/l) 2000 1000 1500 1000 500 500 0 1 0 1 dCFL 0.5 dCFL 0.5 0 200 400 600 800 1000 1200 1400 0 Time [minutes] 200 400 600 800 1000 1200 1400 Time [minutes] Rainfall runoff and TSS modelling at Flores 88 – 8 May 2001 Uncertainty bands for TSS WWW-YES- 2009, 8th Word Wide Workshop for Young Environmental Scientists, 2-5 June 2009, Paris Future Work Sub-catchment scale: •Fully analyze all available events at the experimental sub- catchment El Virrey ( event based modelling ) • Analyze available data from experimental subcatchment at Linz ( continuous modelling ) Macromodelling scale: • Fully implement and test the City Drain toolbox application to the Bogotá´s urban drainage system WWW-YES- 2009, 8th Word Wide Workshop for Young Environmental Scientists, 2-5 June 2009, Paris
THANK YOU FOR YOUR ATTENTION! jrodrigu@imperial.ac.uk pabl-rod@uniandes.edu.co WWW-YES- 2009, 8th Word Wide Workshop for Young Environmental Scientists, 2-5 June 2009, Paris
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