Erik Porse, PhD

Home / Water Resources Engineering

Resilience in Engineered, Natural, and Water Systems

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The term resilience emerged in ecology during the early 1970s. At the time, researchers were debating the existence of equilibrium points in ecosystems. Equillibriums were considered stable configurations of species that an ecosystem could “evolve” (or succeed) to reach. Beyond that, little change would occur. Ecology literature accepted the existence of such system-wide, globally-stable states (Lewontin 1969). In this view of […]

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Groundwater Use in Urban Development

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Groundwater is an important water source in urbanized areas.  Cities across many geographies and climates, including Beijing, Mexico City, Buenos Aires, Los Angeles, Bangkok, Houston, Tokyo, Perth, and Lima, have all utilized groundwater to supply much of their potable water needs at some stage of development (Howard and Gelo 2002).  Groundwater provides a significant portion […]

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Managing Arroyos in Los Cabos

This entry is also posted on the Sustainable Cities International blog, which gives updates of work from SCI’s Affiliated Researchers and interns working with member cities throughout the world.  A quiet evolution is taking place in how we use and move water within cities throughout the world.  In Los Cabos, Mexico, where I am working […]

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Hybridization in Stormwater Infrastructure and Governance

Water infrastructure is typically about pipes and bills.  Most cities have dedicated departments that manage water distribution, sewage, and stormwater systems.  Today, however, new designs for more sustainable urban development are re-considering how we deliver these services for residents.  Rather than provide and manage water through centralized services, what are the opportunities and challenges associated […]

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Urban Water and Governance

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Water infrastructure is typically about pipes and bills.  Most cities have dedicated departments that manage water distribution, sewage, and stormwater systems.  Today, however, new designs for more sustainable urban development are re-considering how we deliver these services for residents.  Rather than provide and manage water through centralized services, what are the opportunities and challenges associated […]

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Understanding Arsenic in Drinking Water

Arsenic is a naturally-occurring element that can leach into groundwater and surface water from rocks and minerals.  In most areas, natural levels of arsenic in water are less than 1 ppb, though some communities, particularly in the Western U.S., have recorded natural arsenic levels in water sources over 10 ppb1.  Arsenic can have both acute […]

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Point-of-Use Water Treatments

The cover image for this post comes from FreshHome.com and is just fantastic and quite fitting for a blog post on Point-of-Use treatment, so I had to use it and give all the attribution in the world possible. A variety of physical and chemical point-of-use (POU) treatments exist1.  The most prevalent treatment approach in homes […]

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Phosphorus and Water Treatment

Phosphorus is an important nutrient for organisms.  Many agricultural and industrial processes also use phosphorus, which has led to increased concentrations in runoff and effluents1.  Higher phosphorus concentrations in water bodies can lead to eutrophication and algal blooms that harm aquatic species2.  The ionic form of phosphorus, phosphate (POs4-), bonds with positively-charged ions (hydrogen) and […]

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The Scoop on Anaerobic Digestion

Anaerobic digestion has been used in wastewater treatment processes for decades.  Recent innovations, however, are making the technology more viable for commercial applications. Anaerobic digestion occurs when microbes degrade organic matter in the absence of oxygen gas. It can be used to treat sewage effluent, agricultural byproducts, and solid municipal wastes.  The microbes utilize oxygen […]

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Direct Potable Water Reuse in Cities

Direct potable reuse (DPR) involves processes where “purified municipal wastewater is introduced into a water treatment plant intake or directly into the water distribution system.”1 As populations increase and treatment technologies improve, direct potable reuse may become an economically viable or even preferred option to meet growing global water demand. Water reuse takes many forms. […]

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