High lake levels can cause backwater in the downstream reaches of the streams that flow through the City, which, in turn, can slow flows and increase water levels above that which would otherwise occur. Also, all potential flooding can be aggravated when Cayuga Lake is at or above flood stage. Because the streamward ends of the storm sewers do not have backflow covers, this situation can permit stream water to flow through the sewers and out manholes on the landward sides of streambanks or floodwalls potentially causing flooding before the stream itself reaches the top of the banks. The storm sewers drain to the nearby streams at points below the tops of the streambanks. All of these flood types are compounded by two factors: the storm-sewer system in the City and the elevation of Cayuga Lake. Flash floods are produced by summer thunderstorms. Slow ice-melt and breakup can lead to ice jams and subsequent flooding. Flooding often is a result of snowmelt and rain during the winter and spring. Flooding in the City is an annual problem caused by a variety of distinct and sometimes interconnected reasons. For More Informationįor more information on flood insurance and how to purchase Flood Insurance, please visit the FEMA Flood Insurance page.The City of Ithaca, Tompkins County, N.Y., is in the process of developing a flood management plan for the streams that flow through the City. The City Council Staff Report, FEMA Preliminary FIRM Map, and the Proposed Floodplain Hazard Management Ordinance will be available on the City Council Agendas page. For cities like San Bruno that currently do not have any floodplain management regulations in effect, FEMA requires the City to adopt very detailed legally enforceable floodplain management measures in the form of a codified City ordinance which will allow the City to maintain eligibility in the National Flood Insurance Program. On February 26, 2019, the San Bruno City Council will consider adoption of floodplain management regulations. This letter initiated the six-month adoption process during which the City of San Bruno must comply with explicit requirements imposed by FEMA. This letter provided a six-month notice that the FIS report and FIRM would be effective 6 months later, on April 5, 2019. Since the appeal process has been completed, FEMA issued a Letter of Final Flood Evaluation Determination to the County of San Mateo and City of San Bruno on October 5, 2018. The City is currently working closely with the County of San Mateo and City of South San Francisco to study one of the flooding source and trying to determine how we can mitigate the issue. In April 2018, the City was informed by the SRP denying the appeal.Īlthough our appeal was denied, the City is continuing to work on this issue. The City wanted the SRP to review our analysis and provide independent review of our findings. The City continued and submitted the application to FEMA immediately requesting the Scientific Resolution Panel or SRP which is the last step in the appeal process. Based on the results, the City submitted an appeal package to FEMA on August 2016 along with letters of support from both Congresswoman Jackie Speier and Supervisor David Pine. ![]() The analysis completed by the City's technical expert concluded the flooding area is significantly smaller than FEMA's findings. ![]() The City worked with a firm that has technical expertise in coastal engineering and with FEMA to evaluate and confirm the impacts and extent of the FEMA flood hazard area. By Federal Law, any property owner with a federally regulated or insured mortgage loan is required to purchase flood insurance for any property within FEMA flood hazard zones. ![]() There are financial impacts to private property owners whose property is mapped into the flood zone. The result of the study will be used by FEMA to identify wave-induced flood risks for coastal communities and develop detailed flood hazard maps.Īlthough FEMA's previous studies did not show any special flood hazard areas in San Bruno, the new analysis completed by FEMA identified numerous residential properties within the City's Belle Air neighborhood as potentially subject to coastal flooding. Towards the end of 2014, the Federal Emergency Management Agency (FEMA) notified the City of San Bruno that they were performing the San Francisco Bay Area Coastal Study for each of the Bay Area counties including the San Mateo County.
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