![]() The City’s Flood Damage Protection Ordinance (FDPO) restricts new development from obstructing the flow of water and increasing flood heights. The ponds are mechanisms to hold the rain water as not to over burden the storm water conveyance system. Both ponds allow the water to escape by evaporation or absorption back into the ground. A Detention Pond temporally holds the water allowing the water to drain slowly into the drainage system. What is the difference between a Retention Pond and a Detention Pond?Ī Retention Pond permanently holds the water all the time and does not have a natural discharge. The ponds are designed to hold back certain amount of water and releasing the storm water at a later time when the system is not so full.Ĥ. Increasing the amount of water going to the system will over tax the system thereby causing water back up and flooding. Storm water systems are design to transport a set amount of water over a period of time. Rain water that would absorb into the ground is now being pushed off site in an increased amount and faster. How do ponds prevent flooding?Īs development occurs impervious surfaces and rain gutters are being installed. Take immediate action to protect lives/property. Prepare for flooding.įlood warning is when a flood is imminent or occurring. What is the difference between a Flood watch and Flood warning?įlood watch is when conditions are in place for a flood event but location and magnitude are still uncertain. If you see someone dumping trash or debris in the canals, please report it to City’s Customer Service desk at 651-6565. This clogs up the pipes and prevents water from draining. For example, do not sweep or blow yard leaves, pine needles, grass clippings or soil into the storm system. What else can I do to prevent my house from flooding?īesides flood insurance, you should protect your structure by ordinary means. The City has not mapped the Coastal A zone at this time. Building damage in Coastal A Zones is consistent with those observed in V Zones, not riverine A Zones. A building in this area is subject to breaking wave heights between 2.9 feet and 1.5 feet. The Coastal A Zone: is a term that is used to draw a distinction between coastal V zones and inland A Zones, and to highlight similarities between V Zones and A Zones in coastal areas. A registered professional engineer or architect must develop, review and certify the structural design, specifications and plans. Such construction usually means placing the structure on piles (pilings), and these pilings must also be anchored to resist flotation, collapse and lateral movement due to the combination effects of wind and water loading forces of the 100 year storm. To protect against wave scouring and frontal velocity, structures must be elevated so that the lowest horizontal structural member (floor joist) is above the designed base flood elevation (DBFE). Homes in this area are on the south side of Savannah along the Forest and Vernon Rivers. VE zones are in the “High Risk” area and will experience rising waters, severe winds and wave action greater than three feet. The VE Zones are the most dangerous flood zones. ![]() Also, in this zone the “50% rule” applies. All new construction must be constructed above the designed base flood elevation (DBFE). Zone AH indicated shallow flooding, usually in the form of a pond, with an average depth ranging from 1 to 3 feet. ![]() For example, “AE-15" means that the lowest finished floor elevation of the structure must be at or above 15 NAVD 1988 because that is where the predicted flood water will rise. “AE” means a base flood elevation has been determined. An unnumbered “A” zone means that no Base Flood Elevation (BFE) above Sea Level has yet been determined. Structures have a 1% annual chance of flooding and a 26% chance of flooding over the life of a 30-year mortgage. These areas are in the “High Risk” area and are prone to flood with rising water in both the 100 year and the 500 year storms. The A, AH and AE Zones are the flood zones which are common in Savannah. The lightly shaded X or X_500, “Moderate Risk”, is above or protected from the 100 year floodplain, but may have up to a foot of water in a 500 year storm event. The X zone, “Low Risk”, is considered above the 100 and 500 year floodplains. In Savannah there are six zones: A, AE, AH, VE, X, and X_500. What are the different Flood Zones and Risks?
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