Fema list of communities in flood zones update#

The maps help set minimum floodplain standards, which helps communities build safely and resiliently, and they also determine the cost of flood insurance, which helps property owners financially protect themselves against flooding. Floodplain maps inform communities about local flood risk.

Fema list of communities in flood zones update#

Significant storm event on June 25, 2006Īlexandria is participating in a Flood Insurance Study being conducted by the Federal Emergency Management Agency (FEMA) to update the City’s current floodplain maps.Tropical Storm Lee on September 11, 2011.Report illegal dumping to T&ES Stormwater Management Division at 703.746.6499.Request maintenance service on storm drains or streams through Alex311.Report localized drainage problems to T&ES Maintenance at 703.746.4488.The City also investigates illegal dumping that can threaten the quality of waterways and contribute to flooding. To mitigate flooding, the City conducts maintenance on storm drains and streams that become clogged with debris, soil erosion and overgrowth of vegetation. Smaller floods have a greater chance of occurring in any year and can create a significant flood hazard to people and property close to the channel. Put another way, it has about a 26% chance of being flooded over the life of a 30-year mortgage. The 100-year floodplain is the area that has a 1% chance of being flooded in any given year.In conjunction with development in low-lying areas and an overtaxed stormwater system, the tidal influence on the Potomac River can also contribute to flooding. Summer thunderstorms with high intensity-short duration rainfall are the most common flooding problem.Alexandria is prone to flooding from heavy rainfall and tropical storms, creating overbank flooding from the Potomac River and its tributaries.Moderate water temperature, which reduces potential harm to aquatic plants and animals.

Provide habitat for diverse species of plants and animals, some of which can not live anywhere else.Reduce the frequency and duration of low flows of surface water by serving as a recharge area for groundwater.Create improved water quality and reduce the amount of sedimentation transported downstream by acting as a filter for stormwater runoff and flow.Reduce flood velocities and provide flood storage to reduce peak flows downstream by spreading over a large area.Tarleton Park and Cameron Run Regional Park contain natural open space and parklands in the Cameron Run floodplain.

Dora Kelley Park, Brook Valley Park and All Veterans Park contain parklands and dedicated natural areas located within the Holmes Run floodplain.

Fort Williams Park has dedicated open space in a natural forested environment, as well as recently restored natural areas located in the Strawberry Run floodplain.

Four Mile Run Park includes about 18 acres of dedicated wetlands in the Four Mile Run floodplain.

Park property along many of the City's waterways and open spaces located within floodplains have been designated as natural floodplains. A civil engineer for the Stormwater Management Division surveys a gated section of Cameron Run during an inspection in May 2022.