David Purkey

Senior Scientist


Davis, CA
dpurkey@sei-us.org
skype: dpurkey
+1 (530) 753-3035 x1#

David Purkey runs the Northern California office of SEI-US and is actively involved in the SEI Water and Sanitation Program in the the United States and globally. Much of his work centers around the development, dissemination and application of SEI's Water Evaluation and Planning (WEAP) system. His research interests include understanding the potential impacts of and adaptation to climate change in the water sector and aquatic ecosystems, integrated water resources management that focuses on linking the management of surface water and groundwater to meet a broad spectrum of objectives, and equitable management of transboundary water resources. David and his team are experienced in applying a range of hydrologic, hydraulic, and planning models in setting as diversion as California, the US-Mexico border, the Great Lakes, and West and Southern Africa. David received his Ph.D. in hydrology from the University of California, Davis in 1998.


Recent Publications by David Purkey

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Ríos del Páramo al Valle, por Urbes y Campiñas: Building climate adaptation capacity in water resources planning

SEI and USAID final project report

Author(s): Escobar, M. ; Purkey, D.
Year: 2016

Research Area(s): Water Resources

Description: This report synthesizes lessons from a three-year project to build capacity and develop tools to support climate change adaptation in Colombian watersheds. The Ríos del Páramo al Valle project operated from 2012 to 2015, applying a participatory planning process developed by SEI called robust decision support (RDS). The project integrated contributions from academic institutions and Corporaciones Autónomas Regionales (CARs), the regional water governance agencies. The goal was to help create regional and national leaders with long-term capacity to manage and plan the development of watersheds while integrating climate considerations.
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Ríos del Páramo al Valle, por Urbes y Campiñas: Creando capacidad de adaptación en la planeación de recursos hídricos

SEI and USAID final project report

Author(s): Escobar, M. ; Purkey, D.
Year: 2016

Research Area(s): Water Resources

Description: Este informe sintetiza las lecciones de un proyecto de tres años para fomentar la capacidad y desarrollar herramientas para apoyar la adaptación al cambio climático en las cuencas de Colombia. El proyecto Ríos del Páramo al Valle, que operó del 2012 al 2015, aplicó métodos de planificación participativas desarrolladas por SEI, incluyendo la metodología de Apoyo a Decisiones Robustas (ADR), para apoyar a las autoridades ambientales en Colombia a planificar sus cuencas. En particular, se trabajó en el fortalecimiento de capacidades y en el desarrollo de herramientas para la planificación de los recursos hídricos. Este proceso contó con la participación activa de instituciones académicas y de las Corporaciones Autónomas Regionales (CAR). Esto ayudó a formar líderes regionales y nacionales con capacidad para realizar una adecuada planificación de los recursos hídricos que incluyó el componente de cambio climático.
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Modeling of Andean páramo ecosystems' hydrological response to environmental change

Water, 8(3), 94

Author(s): Flores, F. ; Galaitsi, S. ; Escobar, M. ; Purkey, D.
Year: 2016

Research Area(s): Water Resources

Description: This paper describes the modelling of the Quiroz-Chipillico watershed in the Piura region of Peru to simulate the impacts of possible changes within the hydrological system and thus inform decision-making about development for the region. In the Peruvian Andes, water infiltration from tropical wetlands, called páramo, generates headwaters for downstream rivers. The hydrological processes of these wetlands are not well understood within the larger hydrological system, impeding efforts to mitigate the rapid environmental changes anticipated due to regional population growth and climate change. This study constructed and calibrated a Water Evaluation and Planning (WEAP) system model for ecosystems with sparse data in the Quiroz-Chipillico watershed in the Piura region of Peru. The model simulates the impacts of possible changes within the hydrological system to assist decision-makers in strategizing about sustainable development for the region, especially the páramo.
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An integrated assessment of water-energy and climate change in Sacramento, California: How strong is the nexus?

Climatic Change, online July 14, 2015

Author(s): Dale, L.L. ; Purkey, D. ; Heaps, C. ; Sieber, J. ; Karali, N.; Millstein, D.; Carnall, M.; Vicuña, S.; Borchers, N.; Bustos, E.; O'Hagan, J.; Collins, W.D.; Sohn, M.D.
Year: 2015

Research Area(s): Water Resources ; Energy Modeling ; Adaptation & Vulnerability

Description: This paper is among the first to report on the full integration of basin-scale models that include projections of the demand and supply of water and energy for residential, commercial, industrial, and agricultural sector users. The authors link two widely used regional planning models, WEAP and LEAP, to study the impact of rising climate variability on water and electricity use in Sacramento, Calif. Historical data, combined with the current energy and water system configuration, were used to assess the implications of changes in temperature and precipitation. Climate simulations suggest that electricity imports to the region would increase during hot dry spells, when regional power production is most constrained. In particular, regional imports of electricity would increase over 35% in hot dry years, assuming a 4°C increase in average temperature and a 25% decrease in average precipitation.
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Relevancia y utilidad del proceso ADR y del sistema WEAP para la formulación de Planes de ordenamiento y Planes de manejo de cuencas y ríos en Colombia (POMCAs y PORHs)

SEI and USAID discussion brief

Author(s): Purkey, D. ; Mendoza Salamanca, T.
Year: 2015

Research Area(s): Water Resources

Description: Este resumen de discusión describe cómo el marco Apoyo a Decisiones Robustas (ADR) y el Sistema de Evaluación y Planeación del Agua (Water Evaluation And Planning - WEAP) fortalecen y a la vez vinculan a los Planes de Ordenamiento y Manejo de las Cuencas (POMCA) y los Planes de Ordenamiento de los Recursos Hídricos (PORH). En la actualidad, los principales obstáculos para la Gestión Integral del Recurso Hídrico (GIRH) en Colombia son el insuficiente conocimiento del recurso en términos de oferta, demanda, calidad y riesgos, y la exigua participación y coordinación social en el proceso, todo lo cual tiene como resultado una menor capacidad de administración y toma de decisiones informadas. Con la metodología de planificación ADR y la herramienta WEAP se ha logrado construir una sólida base de datos numéricos y gráficos, y modelos de simulación de incertidumbres relativas a los impactos del cambio climático, cambios en el uso de la tierra, presiones demográficas y patrones de desarrollo económico sobre la cantidad y la calidad del agua necesaria para diferentes usos (biodiversidad, agricultura, energía y consumo humano).
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