{"query_echo":{"q":"","filters":{"analysis_type":["hydrologic modeling"]},"warnings":[{"code":"facet_value_not_in_vocabulary","message":"Value 'hydrologic modeling' for facet 'analysis_type' is not in the controlled vocabulary."}]},"total":{"value":1,"relation":"eq"},"page":1,"page_size":20,"self":"https://climateinsightsdirectory.org/api/v1/search?analysis_type=hydrologic+modeling","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"]}]}