INTRODUCTION
SOCIO HYDROLOGICAL VULNERABILITY FOR MEXICO CITY AND METROPOLITAN AREA
When proposing comprehensive and inclusive sustainable solutions for improving water security in cities it is important to understand interrelationships within socio-ecological systems to determine the disasters and risks that a given population faces. Thus, it is essential to take into account the vulnerability of a given community, which encompasses poverty, inequality and social justice issues. It is also fundamental to establish how local populations resolve, through their traditional knowledge and practices, their water and sanitation needs.
This project outlines the development and design of an interdisciplinary modelling tool to assess the impacts of decentralised sanitation on the socio-hydrological resilience of Mexico City, using the constructed wetlands (CWs) of Cuajimalpa as a case to study to test and calibrate the model. This scalable tool highlights areas that have the lowest resilience and enables the assessment of different schemes for optimising resilience.
A large portion of this report also focuses on the construction of input datasets to drive the model, which requires spatially distributed data from multiple sources. The datasets used in this study reflect those currently available, with each carrying its own assumptions. At the scale of this study, datasets were often incomplete and details on a number of techniques for filling these gaps based on the properties of surrounding neighbourhoods and provided in the following sections.
The tool analyses the social-hydrological resilience across Mexico City both now and in the future, based on forecast climate, land-use and population change in 2050. It then analyses the resilience after the implementation of a system of Constructed Wetlands across the whole city, for both the current and future scenario.
General Methodology Process
01 Socio Hydrological Index (SHI) methodology. A Socio Hydrological Index was developed based on previous studies, allowing the resilience of the Mexico City socio-hydrological system to be assessed. The SHI method allows the impacts of climate, population, land-use and water-management decisions on socio-hydrological resilience to be compared at a range of scales.
02 Weighting of index components AHP Method.
03 Scale. Clustering process to determine effective area for missing data interpolation and its scale. Based on social connectivity.
04 Data compilation This part of the process includes gathering all the data for the MCDMX, based on different sources.
04 01 Missing data The process consists of filling in the missing data from each indicator, by providing the blocks without data with the average value from their cluster.
05 Development of the tool The tool developed is used to construct for different scenarios.
05 01 Current Scenario SHI for the current situation.
05 02 Constructed Wetland (CW) impacts Includes the distribution of CW and the impact of the implementation of CW on the SHI of the current scenario.
06 Future scenario SHI for the year 2050.
06 01 Future efficacy of Constructed Wetlands (CW) Includes the distribution of CW and the impact of the implementation of CW SHI of the current scenario.
