The management and disposal of flowback and produced waters (FP water) is one of the greatest challenges associated with unconventional oil and gas development. The development and production of unconventional natural gas and oil is projected to increase in the coming years, and a better understanding of the volume and quality of FP water is crucial for the safe management of the associated wastewater. We analyzed production data using multiple statistical methods to estimate the total FP water generated per well from six of the major unconventional oil and gas formations in the United States. The estimated median volume ranges from 1.7 to 14.3millionL (0.5 to 3.8milliongal) of FP per well over the first 5-10years of production. Using temporal volume production and water quality data, we show a rapid increase of the salinity associated with a decrease of FP production rates during the first months of unconventional oil and gas production. Based on mass-balance calculations, we estimate that only 4-8% of FP water is composed of returned hydraulic fracturing fluids, while the remaining 92-96% of FP water is derived from naturally occurring formation brines that is extracted together with oil and gas. The salinity and chemical composition of the formation brines are therefore the main limiting factors for beneficial reuse of unconventional oil and gas wastewater.

a b s t r a c tIn early fall of 2013 in the Front Range of Colorado, several communities experienced intense rainfall over a three-day period, exceeding annual average precipitation rates. Extensive damage occurred to roads, infrastructure, parks, river corridors, homes and business throughout the region. Across the U.S. and in other nations, as population increases in flood-prone areas, flood risks and vulnerability are increasing as well. Successful response to extreme events may be due to policy learning-changes of beliefs, attitudes, behaviors, and goals -in response to new information and experiences. This learning can at times lead to adaptation of local policies to increase the resilience of communities faced with risk from extreme events. The extent of policy learning may depend on how communities engage with stakeholders and the public in post-disaster recovery. Using a comparative in-depth case study approach of seven Colorado communities, this study examines how communities actively engage stakeholders and the public in decision processes after an extreme event.

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When faced with natural disasters, communities respond in diverse ways, with processes that reflect the extent of damage experienced by the community, their resource availability, and stakeholder needs. Local-level processes drive decisions about mitigating future flood risks, such as if, how, and where to rebuild, as well as changes in zoning practices and public outreach programs. Because of their potentially recurring nature, floods offer an opportunity for communities to learn from and adapt to these experiences with the goal of increasing resiliency through deliberation, modification of former policies, and adoption of new policies. By following the response to the September 2013 floods in seven Colorado communities, this study investigates if, how, and why communities successfully learn from extreme events and change their local government policies to increase resilience and decrease vulnerability to future floods. We find that greater openness of post-flood decision process is associated with more in-depth deliberation, learning, and more substantive and frequent policy change.