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Developing countries such as the Philippines depend greatly on their natural resources and ecosystem services. However, the capacity to sustain these services is currently being pressured by various environmental hazards, mainly brought about by climate change. Thus, it is imperative to assess the vulnerability of the environment so that effective ecosystem-based management strategy can be developed to improve the sustainability of these services. This chapter presents a geospatial-based method in assessing the vulnerability of watersheds in the country to various environmental hazards. This model is called the Geospatial-Based Regional Environmental Vulnerability Index for Ecosystems and Watersheds, or, in short, the GeoREVIEW model. GeoREVIEW is composed of 21 indicators and each indicator is evaluated using a scale of 1 to 5. A scale of 1 indicates low vulnerability while a scale of 5 signifies high vulnerability. Finally, to determine the vulnerability level of the area, its overall vulnerability point (OVP) is calculated. This model is utilized to evaluate the vulnerability of two significant ecosystems near Metro Manila – the La Mesa Watershed (LMW) and the Mt. Makiling Forest Reserve (MFR). Based on the assessment, it was found that both are already classified as “at risk” levels. However, MFR (OVP=55.24) is found to be less vulnerable than LMW (OVP=62.52). The results from this assessment can be used to improve the management of these areas and can also aid in targeting policy interventions associated with climate change.

This paper aims to construct a simplified distributed hydrological model based on the surveyed watershed soil properties database.

The new established model requires fewer parameters to be adjusted than needed by former hydrological models. However, the achieved stream-flow simulation results are similar and comparable to the classic hydrological models, such as the Xinanjiang model and the TOPMODEL.

Good results show that the discharge and the top surface soil moisture can be simultaneously simulated, and that is the exclusive character of this new model. The stream-flow simulation results from two moderate hydrological watershed models show that the daily stream-flow simulation achieved the classic hydrological results shown in the TOPMODEL and Xinanjiang model. The soil moisture validation results show that the modeled watershed scale surface soil moisture has general agreement with the obtained measurements, with a root-mean-square error (RMSE) value of 0.04 (m³/m³) for one of the one-measurement sites and an averaged RMSE of 0.08 (m³/m³) over all measurements.

In this paper, a new simplified distributed hydrological model was constructed.

Over the last decade, new governance-style, collaborative approaches to environmental management have increased exponentially. What is not well known is how the structure of these partnerships, particularly the policies that foster their development, may contribute to theʼ ability to achieve either procedural or substantive policy goals. Our study investigated efforts in the States of Washington and Oregon to encourage the development of collaborative watershed management institutions. Thirtyfive watershed partnerships were examined to understand how the planning groups implement policy objectives and how partnerships are creating or modifying institutions for planning and implementation. Our findings suggest that both States face similar challenges in important respects. Challenges include obtaining adequate participation, developing and sustaining organizational capacity, and planning implementation. Together, these findings demonstrate that new governance strategies are not a panacea for water management.

The United States today boasts of a complex and extensive set of public and private institutions and arrangements for managing its water resources. Today's system of watershed management is neither entirely top-down nor bottom-up. It is not entirely planned, nor is it entirely laissez-faire. Rather it is a hybrid. This chapter analyzes through a historical lens how American watershed management evolved to this state. It looks at two driving factors: technological change and trends in American political culture. Technology provided the reason for water resource and watershed management to evolve because of the conflicts provoked by its unintended and negative side effects, such as pollution. American political culture mediated the way that individuals and government reacted to these conflicts and spurred the evolution of new institutions.

Environmental decision making involving multiple stakeholders can benefit from the use of a formal process to structure stakeholder interactions, leading to more successful outcomes than traditional discursive decision processes. There are many tools available to handle complex decision making. Here we illustrate the use of a multicriteria decision analysis (MCDA) outranking tool (PROMETHEE) to facilitate decision making at the watershed scale, involving multiple stakeholders, multiple criteria, and multiple objectives. We compare various MCDA methods and their theoretical underpinnings, examining methods that most realistically model complex decision problems in ways that are understandable and transparent to stakeholders.

The watershed approach is recognized as a holistic approach to ecosystem management. The chapter examines the concept of watershed as an ecosystem in relation to ecosystem management, disaster risk reduction, and climate change adaptation. It describes the importance of watersheds in disaster risk reduction and climate change adaptation. It specifically looks at the watershed approach and provides some case studies showing the important role of communities in watershed management. Moreover, it discusses some incentive schemes in managing watersheds.

Permaculture, as a design science supporting “permanent culture,” has developed experience globally in ecologically regenerative design. The Aral Sea watershed provides a unique opportunity to apply a relevant design process aiming at restoration of ecological function. Permacultural practice follows a core of ethics and principles and a basic design process based on such factors as stakeholder analysis, water harvesting principles, and the scale of permanence. The focus of permacultural interventions is on water, forests, and perennial vegetation, balanced with human needs. This chapter highlights key elements of the design process and summarizes the process of permaculture rehabilitation. Given success in similar situations working at a smaller-scale suggests a potential approach for regeneration in the Aral Sea Basin.

This book reviewed a historical sketch of lagoon fisheries management from the past to the present and future orientation that fishers and concerned stakeholders might commit themselves to take actions. The study made great endeavor to highlight the lagoon fisheries with regard to development and conservation at multiple scales associated with various stakeholders. Evidence from case studies (state-based, community-based, and partnership-based) revealed that the nature of lagoon fisheries is quite complex and ecosystem processes are dominated by an essential quality of uncertainty. Indeed, lagoon fisheries are considered vulnerable in terms of climate variability, the extent of salinity level and water volumes, patterns of hydrological cycle, and water pollution. The case studies addressed how lagoon areas are physically or climatically subject to various influences not only from their internal environment but also from the adjacent marine and terrestrial areas. In an effort to maintain (and, preferably, improve) fishery resources in the lagoon environment, attention has to be paid to highlight a wider realization of lagoon fisheries management at multiple scales. The scope of its management might be expanded beyond the range of fish ecology (with the exception of migratory fishes such as salmon and eel). Given that the focus of lagoon fisheries management is on the entire watershed, multiple resources and livelihood activities must be taken into account; many resources are transboundary in nature with a high degree of mobility (Armitage, Marschke, & Plummer, 2008).

This chapter presents projections of residential development in Wappinger Creek watershed of Dutchess County, New York in the Hudson River Valley. A spatial econometric model is developed based on data from a geographical information system (GIS) of county-level socio-economic trends, tax parcel attributes, town-level zoning restrictions, location variables, and bio-geophysical constraints including slope, soil type, riparian and agricultural zones. Monte Carlo simulation is employed to distribute spatially explicit projections of land-use change under various residential development scenarios. Scenario analysis indicates the likelihood of continued residential, decentralized development patterns in formerly agricultural and forested parcels. Policy scenarios demonstrate possible courses of action to direct development and protect watershed health.

Over the past three decades ecological economics has emerged as a coherent transdisciplinary approach to environmental problem solving. However, its evolution has been quite dissimilar in different parts of the world. In the US and UK, ecological economics evolved as a critique of and alternative to a comparatively strict application of economic theory to environmental decision making. In particular, the narrow application of benefit–cost analysis often reduced environmental decisions to one metric within a single value system (the market economy). The attractiveness of these traditional economic approaches to environmental policy has always been their “one size fits all” approach. No matter what the problem faced, the same methods were applied with a primary goal of cost effectiveness. But it has become increasingly clear that the ease of application of a strict economic approach is outweighed by its failure to capture the social and environmental contexts and realities of specific environmental problems. In contrast, ecological economics has been more problem-oriented, incorporating multiple stakeholder and disciplinary perspectives in specific contexts to shape the methods that define policy choices. Furthermore, ecological economic approaches involve multiple metrics, multiple points of view, and evolutionary and flexible policy recommendations.