{"query_echo":{"q":"","filters":{"geography":["Nine Mile Run Watershed"]},"warnings":[{"code":"facet_value_not_in_vocabulary","message":"Value 'Nine Mile Run Watershed' for facet 'geography' is not in the controlled vocabulary."}]},"total":{"value":2,"relation":"eq"},"page":1,"page_size":20,"self":"https://climateinsightsdirectory.org/api/v1/search?geography=Nine+Mile+Run+Watershed","stability":"beta","ai_marking":{"digital_source_type":{"uri":"http://cv.iptc.org/newscodes/digitalsourcetype/trainedAlgorithmicMedia","name":"Created using Generative AI"},"notice":"Summary and key insights are generated using artificial intelligence."},"results":[{"id":"rmi-001090","url":"https://climateinsightsdirectory.org/document/rmi-001090","title":"RE-EVALUATING STORMWATER THE NINE MILE RUN MODEL FOR RESTORATIVE REDEVELOPMENT TECHNICAL APPENDIX","publisher":{"name":"RMI","organization":"rmi"},"document_type":"report","language":"en","date_published":"1999-10","source_url":"https://rmi.org/app/uploads/2017/05/RMI_Document_Repository_Public-Reprts_W99-22a_TechAppxStormwater.pdf","generator":"Climate Insights Directory","generated_fields":["summary","key_insights","climate_tags","geography_discussed","analysis_type"],"summary":{"text":"The document provides a detailed framework for 'restorative redevelopment' in the Nine Mile Run Watershed, focusing on shifting from conventional 'end of the pipe' stormwater conveyance to site-based infiltration and treatment. It details conceptual designs for four representative sites—Hunter Park, Edgewood Crossroads, Regent Square Gateway, and Sterrett School—and proposes a comprehensive policy framework to overcome institutional barriers to green infrastructure.","ai_generated":true,"unit":"rmi-001090#summary","date_modified":"2026-10-23"},"key_insights":[{"text":"The Nine Mile Run Watershed, a 6.5 square mile urban area, suffers from combined sewer overflows (CSOs), sanitary sewer overflows (SSOs), and depleted stream base flow due to reduced groundwater recharge.","ai_generated":true,"unit":"rmi-001090#insight-1","date_modified":"2026-10-23"},{"text":"The charrette's central thesis argues for retrofitting urban environments to mitigate the quantity and quality of stormwater at the source rather than relying solely on conventional conveyance and treatment systems.","ai_generated":true,"unit":"rmi-001090#insight-2","date_modified":"2026-10-23"},{"text":"Design teams were tasked with a performance goal to infiltrate or detain runoff from a two-year, 24-hour storm (2.50 inches) on-site.","ai_generated":true,"unit":"rmi-001090#insight-3","date_modified":"2026-10-23"},{"text":"The proposed budget for on-site stormwater management was set at $2.00 per gallon of hydraulic capacity, based on regional costs for conventional detention tanks which ranged from $0.88 to $3.31 per gallon.","ai_generated":true,"unit":"rmi-001090#insight-4","date_modified":"2026-10-23"},{"text":"At the Hunter Park site, proposed strategies include creating wetlands with a hydraulic treatment capacity of 25,000 cubic feet and woodland bioretention areas with a capacity of 10,000 cubic feet.","ai_generated":true,"unit":"rmi-001090#insight-5","date_modified":"2026-10-23"},{"text":"For the Edgewood Crossroads site, the team proposed a depressed bowl with a porous bottom to retain and infiltrate stormwater, serving as both a community gathering space and a demonstration facility.","ai_generated":true,"unit":"rmi-001090#insight-6","date_modified":"2026-10-23"},{"text":"At the Sterrett School site, the team estimated that disconnecting roof leaders and restoring natural drainage could reduce the volume of water entering the combined sewer system from 35,000 cubic feet to 14,000 cubic feet during a 2-year storm.","ai_generated":true,"unit":"rmi-001090#insight-7","date_modified":"2026-10-23"},{"text":"The Regent Square Gateway site design focuses on water quality filtering via 'Terraced Underdrained Basins' (TUBs) using local slag aggregate to treat the 'first flush' of stormwater before it enters Nine Mile Run.","ai_generated":true,"unit":"rmi-001090#insight-8","date_modified":"2026-10-23"},{"text":"The policy team recommends the creation of a 'Watershed Management Entity' or authority to coordinate infrastructure, manage the stream system, and set base rates for stormwater user fees across municipal boundaries.","ai_generated":true,"unit":"rmi-001090#insight-9","date_modified":"2026-10-23"},{"text":"The document identifies several regulatory barriers in BOCA (Building Officials Code Administrators) codes, such as rules against 'stagnant water' and 'weeds' (over 10 inches), which may discourage the use of infiltration basins and native grass swales.","ai_generated":true,"unit":"rmi-001090#insight-10","date_modified":"2026-10-23"}],"climate_tags":["green infrastructure","water quality","groundwater recharge"],"geography_discussed":["Pennsylvania","Los Angeles"],"frame_perspective":[],"analysis_type":["conceptual design","policy analysis","hydrologic modeling"]},{"id":"rmi-001089","url":"https://climateinsightsdirectory.org/document/rmi-001089","title":"RE-EVALUATING STORMWATER","publisher":{"name":"RMI","organization":"rmi"},"document_type":"report","language":"en","date_published":"1999-08","source_url":"https://rmi.org/app/uploads/2017/05/RMI_Document_Repository_Public-Reprts_W99-22_ReevalStormwater.pdf","generator":"Climate Insights Directory","generated_fields":["summary","key_insights","climate_tags","geography_discussed","analysis_type"],"summary":{"text":"The report presents a model for urban watershed restoration in the Pittsburgh region, specifically focusing on the 6.5 square mile Nine Mile Run watershed. It argues for 'restorative redevelopment,' which embeds the removal of stormwater from sewer systems into the incremental process of urban renewal. By using 'green infrastructure'—such as bioretention areas, porous pavements, and cisterns—the model aims to reduce combined sewer overflows (CSOs) and sanitary sewer overflows (SSOs) while providing community benefits like beautification and recreational amenities. The report details four sample designs (Hunter Park, Edgewood Crossroads, Sterrett School, and Regent Square Gateway) that meet specific hydrologic and budget criteria, and recommends the establishment of a permanent coordinating body to manage the watershed across municipal boundaries.","ai_generated":true,"unit":"rmi-001089#summary","date_modified":"2026-10-23"},"key_insights":[{"text":"The 'restorative redevelopment' model aims to solve sewer overflows and stormwater runoff at the source by absorbing costs into the incremental redevelopment of urban areas, thereby reducing the need for costly single-purpose infrastructure like larger pipes and expanded treatment plants.","ai_generated":true,"unit":"rmi-001089#insight-1","date_modified":"2026-10-23"},{"text":"The report identifies several technical strategies for removing stormwater from sewers and restoring natural processes, including capturing roof runoff in cisterns, using porous pavements, rehabilitating soils to increase infiltration, and 'daylighting' historic streams by excavating culverts.","ai_generated":true,"unit":"rmi-001089#insight-2","date_modified":"2026-10-23"},{"text":"Sample designs for the Nine Mile Run watershed were required to infiltrate or detain runoff from a '2-year, 24-hour' storm on-site, within a construction budget of $2 per gallon of hydraulic capacity.","ai_generated":true,"unit":"rmi-001089#insight-3","date_modified":"2026-10-23"},{"text":"The Hunter Park design demonstrates how a neglected urban park can be used as a catalyst for restoration, utilizing a woodland bioretention area, constructed wetlands, and the daylighting of a culverted stream to treat runoff from the park and adjacent residential blocks.","ai_generated":true,"unit":"rmi-001089#insight-4","date_modified":"2026-10-23"},{"text":"The Edgewood Crossroads design highlights the economic benefit of small-scale residential retrofits; for example, a $1,000 grant per home for infiltration beds could be paid off in 8 years through savings at the sewage treatment plant.","ai_generated":true,"unit":"rmi-001089#insight-5","date_modified":"2026-10-23"},{"text":"The Sterrett School design illustrates the educational potential of watershed restoration, using cisterns to divert roof runoff from combined sewers for irrigation and a student-designed 'Art Creek' mosaic to teach the hydrologic cycle.","ai_generated":true,"unit":"rmi-001089#insight-6","date_modified":"2026-10-23"},{"text":"The Regent Square Gateway design focuses on the confluence of the urban watershed and Frick Park, using terraced underdrained basins and filter embankments to treat runoff from Braddock Avenue and the retail parking lot.","ai_generated":true,"unit":"rmi-001089#insight-7","date_modified":"2026-10-23"},{"text":"The report argues that a permanent coordinating body is necessary to manage the watershed's infrastructure and ecosystems because these systems transcend municipal boundaries.","ai_generated":true,"unit":"rmi-001089#insight-8","date_modified":"2026-10-23"},{"text":"The report advocates for 'green infrastructure,' which expands the definition of stormwater infrastructure to include the biological and physical capacities of soil and vegetation to absorb water and filter pollutants.","ai_generated":true,"unit":"rmi-001089#insight-9","date_modified":"2026-10-23"},{"text":"The policy team recommends a comprehensive action plan including the restoration of the hydrologic regime through monitoring and modeling, the improvement of stream channels and floodplains, and the conservation of urban watershed habitats.","ai_generated":true,"unit":"rmi-001089#insight-10","date_modified":"2026-10-23"}],"climate_tags":["green infrastructure","rainwater harvesting","water quality","groundwater recharge"],"geography_discussed":["Pittsburgh","Wilkinsburg","Swissvale","Edgewood","Frick Park"],"frame_perspective":[],"analysis_type":["case study","policy recommendation","design proposal"]}]}