This document presents the work undertaken in the Case study regions in Task 8.3 of the WaterStrategyMan Project, “Generation of Coherent Water Management Scenarios”. The purpose of the task is to build water management scenarios to evaluate alternative allocation options of water resources in the Case Studies. The scenarios are based on specific supply interventions or demand side actions, and assess their effect on the current and future matching of water demand, in a comparison with the base case using user-defined criteria set by the water users, regulators and decision makers.

The main objectives of scenario analysis were to determine the options that could be effective in meeting the targets of each Case Study analysis, and estimate their potential extent, cost and environmental impact. The Deliverable presents the findings of this assessment in the following Case Studies:

• Paros Island, Greece,
• Belice Basin, Italy,
• Limassol Region, Cyprus,
• Tel Aviv Region, Israel,
• Tenerife, Canary Islands, Spain, and
• Ribeiras do Algarve, Portugal

The outcomes of the scenario analysis are used for the formulation of appropriate Water Management Strategies for the Case Study Regions in the next stage of the Project.

Deliverable 19 and the corresponding publishable report, Deliverable 21.6, provide Guidelines for Water Management methods and options examined in the process of development of suitable water management strategies for water deficient regions. Guidelines are given as a set of instructions that analyze a given strategy into actions required within the selected water management options, set within a suitable but flexible time framework. The document aims at enabling the dissemination of the Project results, by providing a step-by-step analysis of the specific options to be used within the framework of a strategy and their specifications (relative costs,duration, and project lifetime). Case Study regional experiences in the application of these options have been included, in order to provide input based on hands-on experience.

Deliverable 21.4 presents the Decision Support System developed in the framework of the WaterStrategyMan project. The WSM DSS was functional to the analysis of the dominant and shifting paradigm options and of their quantitative, qualitative and economic impacts in the selected regional water resource systems. The primary aim was to develop a tool, able to simulate the behaviour of water resource systems under different scenarios of water availability and demand, and including a module for simulating and evaluating alternative water management strategies. Its implementation was preceded by a comprehensive review of existing suitable methodologies and models for water resources and an analysis of their strong and weak points led to the definition of the present architecture of the DSS.

The Deliverable is structured in two parts: Part I presents the principles, concepts and methodology of the WaterStrategyMan DSS, while Part II is a comprehensive review of existing tools for water management and planning.