ES10+Presentation+-+Fairfield+Drainage+Anaytical+Study

ES10+Presentation+-+Fairfield+Drainage+Anaytical+Study -...

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Unformatted text preview: City of Fairfield City Fairfield Drainage Analytical Study GSI Presentation for ES10 Class Presenter: Raymond Wong December 2, 2009 Study Area - City of Fairfield, Solano County Existing Flooding Issues Flooding at Solano County Facilities - Recent flooding occurred in 1985, 1989, 2002, 2005 - Flooding in 2005 costs the County $1.5 millions to repair the Hall of Justice building and the detention facility. - City believes the flooding is due to low site elevation - County believes the flooding is due to poor drainage system maintenance. Existing Flooding Issues Flooding at Solano County Facilities Flooding area from December 2005 storm event Existing Flooding Issues Flooding at State Street Businesses - Flooding at least three to four times over the last 20 years - In 2005 flood, most tenants experience flooding at the building interiors, some reported to up 18’ deep - Tenants used rafting boats to leave the building during flooding events - Tenants spent $25,000 to $50,000 to repair flood damages, and the stores closed for a week after the 2005 flood - Flood protection berms along the County facility increase the flood risk Federal Emergency Management Agency (FEMA) National Flood Insurance Program (NFIP) Flood Insurance Rate Maps (FIRM) 1968 – National Flood Insurance Act - Indemnify flood losses by insurance - Floodplain management regulations - Reduce disaster assistance and flood control costs 1973 – Flood Disaster Protection Act - Generally limited the Federal disaster assistance to community in NFIP What is a FIRM? It is the official map of a community on which FEMA has delineated the Special Flood Hazard Areas (SFHAs) applicable to the community. Federal Emergency Management Agency (FEMA) National Flood Insurance Program (NFIP) Flood Insurance Rate Maps (FIRM) Special Flood Hazard Areas (SFHAs) -The SFHA is that land within the floodplain of a community subject to a 1 percent or greater chance of flooding in any given year, commonly referred to as the 100-year flood FIRM in Google Earth -> Red – 100-year flood areas Pink – 500-year flood areas Where does the water come from? Where does the water goes? Where does the water come from? - Storm water runoff drainage watersheds up to the area north of Highway 80. Where does the water goes? - Local Storm Drain Pipelines - Pump Stations - Overland Sheet Flow - Union Avenue Creek - Suisun Slough Where does the water come from? Where does the water goes? Where does the water come from? Where does the water goes? Where does the water come from? Where does the water goes? Where does the water come from? Where does the water goes? Hydrology and Hydraulic Analysis INTEGRATED ANALYSIS MODEL HYDRAULIC MODEL HYDROLOGY MODEL TIDAL INFLUENCE URBAN DRAINAGE CULVERTS OPEN CHANNEL DETENTION Hydrology Analysis Hydraulic Analysis HEC-RAS Open Channel / Culvert Analysis StormCAD Pipeline System Analysis Causes of Flooding - Overland Flow - High Tide - Low Elevation at County Facility - Undersize Pump Station - Undersize Culvert and Bridge Crossings - Undersize Pipeline Recommended Improvements – Alternative 2 Recommended Improvements – Alternative 2 Recommended Improvements – Alternative 2 Recommended Improvements – Interim Condition Overview of Project Schedule PHASE Information Information Gathering Gathering Analysis Analysis Alternatives Alternatives Analysis Analysis DELIVERABLES Map TMs H/H Report TM TMs TM Draft Report TMs Final Report MILESTONE MEETINGS 18 months Milestone Meeting with City and County Bi-weekly teleconferences ...
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