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HomeMy WebLinkAbout20091346 Ver 3_Stormwater Site Plans_20120113The projection used in the preparation of this map was the North Carolina State Plane (FIPSZONE 3200). The horizontal datum was the North American Datum of 1983, GRS80 ellipsoid, Differences in datum, ellipsoid, projection, or Universal Transverse Mercator zones used in the production of FIRMs for adjacent jurisdictions may result in slight positional differences in map features across jurisdictional boundaries. These differences do not affect the accuracy of this FIRM. All coordinates on this map are in U.S. Survey Feet, where 1 U.S. Survey Foot = 1200/3937 Meters. Flood elevations on this map are referenced to the North American Vertical Datum of 1988 (NAVD 88). These flood elevations must be compared to structure and ground elevations referenced to the same vertical datum. An average offset between NAVD 88 and the National Geodetic Vertical Datum of 1929 (NGVD 29) has been computed for each North Carolina county. This offset was then applied to the NGVD 29 flood elevations that were not revised during the creation of this statewide format FIRM. The offsets for each county shown on this FIRM panel are shown in the vertical datum offset table below. Where a county boundary and a flooding source with unrevised NGVD 29 flood elevations are coincident, an individual offset has been calculated and applied during the creation of this statewide format FIRM. See Section 6.1 of the accompanying Flood Insurance Study report to obtain further information on the conversion of elevations between NAVD 88 and NGVD 29. To obtain current elevation, description, and /or location information for bench marks shown on this map, please contact the North Carolina Geodetic Survey at the address shown below. You may also contact the Information Services Branch of the National Geodetic Survey at (301) 713 -3242, or visit its website at www.ngs.noaa.gov. North Carolina Geodetic Survey County Average Vertical Datum Offset Table 121 West Jones Street County Vertical Datum Offset (ft) Raleigh, NC 27601 Wake - 0.88 (919) 733 -3836 www.ncgs.state.nc.us Example: NAVD 88 = NGVD 29 + ( -0.88) All streams listed in the Flood Hazard Data Table below were studied by detailed methods using field survey. Other flood hazard data shown on this map may have been derived using either a coastal analysis or limited detailed riverine analysis. More information on the flooding sources studied by these analyses is contained in the Flood Insurance Study report. _ V01117'I1 C. 11,101,1:\',I i Y� 4. ,goperating T h NIf� J •• �III•� II ' •��I• III � This digital Flood Insurance Rate Map (FIRM) was produced through a unique cooperative partnership between the State of North Carolina and the Federal Emergency Management Agency (FEMA). The State of North Carolina has implemented a long term approach of floodplain management to decrease the costs associated with flooding. This is demonstrated by the State's com- mitment to map floodplain areas at the local level. As a part of this effort, the State of N o h Carolina ha s joined in a Cooperating Technical State agreement with FEMA to produce and maintain this digital FIRM. 2 0, 700 000 FI FLOODING EFFECTS FROM LITTLE BRANCH (BASIN 26, STREAM 3) 35' 40' ( 3949 000 N 35 °39': 3948 000 v 692 500 FE 35o39' ( 3947 000 N 690 000 FE 2 0Z FLOODING EFFECTS FROM LITTLE BRANCH '7nwae v 7^KIC v This map is for use in administering the National Flood Insurance Program. It does not necessarily identify all areas subject to flooding, particularly from local drainage sources of small size. The community map repository should be consulted for possible updated or additional flood hazard information. To obtain more detailed information in areas where Base Flood Elevations (BFEs) and /or floodways have been determined, users are encouraged to consult the Flood Profiles, Floodway Data, Limited Detailed Flood Hazard Data, and /or Summary of Stillwater Elevations tables contained within the Flood Insurance Study (FIS) report that accompanies this FIRM. Users should be aware that BFEs shown on the FIRM represent rounded whole -foot elevations. These BFEs are intended for flood insurance rating purposes only and should not be used as the sole source of flood elevation information. Accordingly, flood elevation data presented in the FIS report should be utilized in conjunction with the FIRM for purposes of construction and /or floodplain management. Boundaries of regulatory floodways shown on the FIRM for flooding sources studied by detailed methods were computed at cross sections and interpolated between cross sections . T he floodways were ba s ed on hydraulic considerations with regard to requirements rements of the National Flood Insurance Program. Floodway widths and other pertinent floodway data for flooding sources studied by detailed methods as well as non - encroachment widths for flooding sources studied by limited detailed methods are provided in the FIS report for this jurisdiction. The FIS report also provides instructions for determining a floodway using non- encroachment widths for flooding sources studied by limited detailed methods. Certain areas not in Special Flood Hazard Areas may be protected by flood control structures. Refer to Section 4.4 "Flood Protection Measures" of the Flood Insurance Study report for information on flood control structures in this jurisdiction. Base map information and geospatial data used to develop this FIRM were obtained from various organizations, including the participating local community(ies), state and federal agencies, and /or other sources. The primary base for this FIRM is aerial imagery acquired by Wake County. The time period of collection for the imagery is 1999. Information and geospatial data supplied by the local community(ies) that met FEMA base map specifications were considered the preferred source for development of the base map. See geospatial metadata for the associated digital FIRM for additional information about base map preparation. Base map features shown on this map, such as corporate limits, are based on the most up-to-date data available at the time of publication. Changes in the corporate limits may have occurred sin c e this map was published. Map users should consult the appropriate community official or website to verify current conditions of jurisdictional boundaries and base map features. This map may contain roads that were not considered in the hydraulic analysis of streams where no new hydraulic model was created during the production of this statewide format FIRM. This map reflects more detailed and up-to -date stream channel configurations than those shown on the previous FIRM for this jurisdiction. The floodplains and floodways that were transferred from the previous FIRM may have been adjusted to conform to these new stream channel configurations. As a result, the Flood Profiles and Floodway Data tables in the Floo d Insurance Study report which contains authoritative hydraulic data) may reflect stream channel distances that differ from what is shown on this map. Please refer to the separately printed Map Index for an overview map of the county showing the layout of map panels, community map repository addresses, and a Listing of Communities table containing National Flood Insurance Program dates for each community as well as a listing of the panels on which each community is located. If you have questions about this map, or questions concerning the National Flood Insurance Program in general, please call 1- 877 -FEMA MAP (1- 877 - 336 -2627) or visit the FEMA website at www.fema.gov. An accompanying Flood Insurance Study report, Letter of Ma p Revision ( LOMB ) or Letter of Map Amendment (LOMA) revising portions of this panel, and digital versions of this FIRM may be available. Visit the North Carolina Floodplain Mapping Program website at www.ncfloodmaps.com, or contact the FEMA Map Service Center at 1- 800 - 358 -9616 for information on all related products associated with this FIRM. The FEMA Map Service Center may also be reached by Fax at 1- 800 - 358 -9620 and its website at www.msc.fema.gov, LEGEND FEET SPECIAL FLOOD HAZARD AREAS (SFHAs) SUBJECT TO )0 000 FEET:„ GRAN, ILLE that has a 1 % chance of being equaled or exceeded in any given year. The Special Flood Hazard Area is the area subject to flooding by the 1 % annual chance flood. Areas of Special Flood Hazard include Zones A, AE, AH, AO, AR, A99, V, and VE. The Base Flood Elevation is the water - surface elevation of the 1% annual chance flood. ZONE A No Base Flood Elevations determined. ZONE AE Base Flood Elevations determined. ZONE Ali Flood depfihs of 1 to 3 feet (usually areas of pondingl; Base Flood , i I also determined. l i 1 l decertified. one AR indicates that the former flood control system is being restored to provide protection from the 1 % annual chance or greater flood. ZONE A99 Area to be protected from 1 % annual chance flood by a Federal flood protection system under construction; no Base Flood Elevations determined. ZONE VE Coastal flood zone with velocity hazard (wave action); Base Flood Elevations Town of determined. Holly Springs :� FLOODWAY AREAS IN ZONE AE Extraterritorial DUI HA r i ° 370403 ° ` ; ^ • FR NKLIN I ) ZONE X Areas of 0.2 % annual chance flood; areas of future conditions 1% annual chance flood; areas of 1% annual chance flood with average depths of less °40' 00" than 1 foot or with drainage areas less than 1 square mile; and areas protected by levees from 1% annual chance flood. 7 500 FEET OTHER AREAS ZONE X Areas determined to be outside the 0.2% annual chance and future conditions 1 % annual chance floodplain. 3949 000 M ZONE D Areas in which flood hazards are undetermined, but possible. F77\ COASTAL BARRIER RESOURCES SYSTEM (CBRS) AREAS \' \ OTHERWISE PROTECTED AREAS (OPAs) CBRS areas and OPAs are normally located within or adjacent to Special Flood Hazard Areas. -- -� 1% annual chance floodplain boundary 0.2% annual chance floodplain boundary and future conditions 1% annual chance floodplain boundary — — — — Floodway boundary { - - Zone D Boundary •••••••••••••••••••• CBRS and OPA boundary w%N Boundary dividing Special Flood Hazard Area Zones and c Base Flood Elevations, flood depths or flood velocities. , _513— Base Flood Elevation line and value; elevation in feet* (EL 987) Base Flood Elevation value where uniform within zone; elevation In feet* *Referenced to the North American Vertical Datum of 1988 Cross section line 23 - - - - -- 23 Transect line Geographic coordinates referenced to the North American I 97'07'3011, 32° 22' 30 ° Datum of 1983 (NAD 83) 4276000M 1000 -meter Universal Transverse Mercator grid ticks, zone 17 1 477 500 FEET 2500 -foot grid values: North Carolina State Plane coordinate system (FIPSZONE 3200, State Plane NAD 83 feet) BM5510 North Carolina Geodetic Survey bench mark (see explanation X in the Datum Information section of this FIRM panel). BM5510 National Geodetic Survey bench mark (see explanation in ® the Datum Information section of this FiRM panel). 039' 30" ® M1.5 River Mile 77, F 7r, F 7 ' 47 C J,10 In I J o o » J i c c : ; . ' 5 0 I I 11 �a � 1. HARNETTj .... ....1. I ».. I _.._�._..__. C —... The projection used in the preparation of this map was the North Carolina State Plane (FIPSZONE 3200). The horizontal datum was the North American Datum of 1983, GRS80 ellipsoid, Differences in datum, ellipsoid, projection, or Universal Transverse Mercator zones used in the production of FIRMs for adjacent jurisdictions may result in slight positional differences in map features across jurisdictional boundaries. These differences do not affect the accuracy of this FIRM. All coordinates on this map are in U.S. Survey Feet, where 1 U.S. Survey Foot = 1200/3937 Meters. Flood elevations on this map are referenced to the North American Vertical Datum of 1988 (NAVD 88). These flood elevations must be compared to structure and ground elevations referenced to the same vertical datum. An average offset between NAVD 88 and the National Geodetic Vertical Datum of 1929 (NGVD 29) has been computed for each North Carolina county. This offset was then applied to the NGVD 29 flood elevations that were not revised during the creation of this statewide format FIRM. The offsets for each county shown on this FIRM panel are shown in the vertical datum offset table below. Where a county boundary and a flooding source with unrevised NGVD 29 flood elevations are coincident, an individual offset has been calculated and applied during the creation of this statewide format FIRM. See Section 6.1 of the accompanying Flood Insurance Study report to obtain further information on the conversion of elevations between NAVD 88 and NGVD 29. To obtain current elevation, description, and /or location information for bench marks shown on this map, please contact the North Carolina Geodetic Survey at the address shown below. You may also contact the Information Services Branch of the National Geodetic Survey at (301) 713 -3242, or visit its website at www.ngs.noaa.gov. North Carolina Geodetic Survey County Average Vertical Datum Offset Table 121 West Jones Street County Vertical Datum Offset (ft) Raleigh, NC 27601 Wake - 0.88 (919) 733 -3836 www.ncgs.state.nc.us Example: NAVD 88 = NGVD 29 + ( -0.88) All streams listed in the Flood Hazard Data Table below were studied by detailed methods using field survey. Other flood hazard data shown on this map may have been derived using either a coastal analysis or limited detailed riverine analysis. More information on the flooding sources studied by these analyses is contained in the Flood Insurance Study report. _ V01117'I1 C. 11,101,1:\',I i Y� 4. ,goperating T h NIf� J •• �III•� II ' •��I• III � This digital Flood Insurance Rate Map (FIRM) was produced through a unique cooperative partnership between the State of North Carolina and the Federal Emergency Management Agency (FEMA). The State of North Carolina has implemented a long term approach of floodplain management to decrease the costs associated with flooding. This is demonstrated by the State's com- mitment to map floodplain areas at the local level. As a part of this effort, the State of N o h Carolina ha s joined in a Cooperating Technical State agreement with FEMA to produce and maintain this digital FIRM. 2 0, 700 000 FI FLOODING EFFECTS FROM LITTLE BRANCH (BASIN 26, STREAM 3) 35' 40' ( 3949 000 N 35 °39': 3948 000 v 692 500 FE 35o39' ( 3947 000 N 690 000 FE 2 0Z FLOODING EFFECTS FROM LITTLE BRANCH '7nwae v 7^KIC v This map is for use in administering the National Flood Insurance Program. It does not necessarily identify all areas subject to flooding, particularly from local drainage sources of small size. The community map repository should be consulted for possible updated or additional flood hazard information. To obtain more detailed information in areas where Base Flood Elevations (BFEs) and /or floodways have been determined, users are encouraged to consult the Flood Profiles, Floodway Data, Limited Detailed Flood Hazard Data, and /or Summary of Stillwater Elevations tables contained within the Flood Insurance Study (FIS) report that accompanies this FIRM. Users should be aware that BFEs shown on the FIRM represent rounded whole -foot elevations. These BFEs are intended for flood insurance rating purposes only and should not be used as the sole source of flood elevation information. Accordingly, flood elevation data presented in the FIS report should be utilized in conjunction with the FIRM for purposes of construction and /or floodplain management. Boundaries of regulatory floodways shown on the FIRM for flooding sources studied by detailed methods were computed at cross sections and interpolated between cross sections . T he floodways were ba s ed on hydraulic considerations with regard to requirements rements of the National Flood Insurance Program. Floodway widths and other pertinent floodway data for flooding sources studied by detailed methods as well as non - encroachment widths for flooding sources studied by limited detailed methods are provided in the FIS report for this jurisdiction. The FIS report also provides instructions for determining a floodway using non- encroachment widths for flooding sources studied by limited detailed methods. Certain areas not in Special Flood Hazard Areas may be protected by flood control structures. Refer to Section 4.4 "Flood Protection Measures" of the Flood Insurance Study report for information on flood control structures in this jurisdiction. Base map information and geospatial data used to develop this FIRM were obtained from various organizations, including the participating local community(ies), state and federal agencies, and /or other sources. The primary base for this FIRM is aerial imagery acquired by Wake County. The time period of collection for the imagery is 1999. Information and geospatial data supplied by the local community(ies) that met FEMA base map specifications were considered the preferred source for development of the base map. See geospatial metadata for the associated digital FIRM for additional information about base map preparation. Base map features shown on this map, such as corporate limits, are based on the most up-to-date data available at the time of publication. Changes in the corporate limits may have occurred sin c e this map was published. Map users should consult the appropriate community official or website to verify current conditions of jurisdictional boundaries and base map features. This map may contain roads that were not considered in the hydraulic analysis of streams where no new hydraulic model was created during the production of this statewide format FIRM. This map reflects more detailed and up-to -date stream channel configurations than those shown on the previous FIRM for this jurisdiction. The floodplains and floodways that were transferred from the previous FIRM may have been adjusted to conform to these new stream channel configurations. As a result, the Flood Profiles and Floodway Data tables in the Floo d Insurance Study report which contains authoritative hydraulic data) may reflect stream channel distances that differ from what is shown on this map. Please refer to the separately printed Map Index for an overview map of the county showing the layout of map panels, community map repository addresses, and a Listing of Communities table containing National Flood Insurance Program dates for each community as well as a listing of the panels on which each community is located. If you have questions about this map, or questions concerning the National Flood Insurance Program in general, please call 1- 877 -FEMA MAP (1- 877 - 336 -2627) or visit the FEMA website at www.fema.gov. An accompanying Flood Insurance Study report, Letter of Ma p Revision ( LOMB ) or Letter of Map Amendment (LOMA) revising portions of this panel, and digital versions of this FIRM may be available. Visit the North Carolina Floodplain Mapping Program website at www.ncfloodmaps.com, or contact the FEMA Map Service Center at 1- 800 - 358 -9616 for information on all related products associated with this FIRM. The FEMA Map Service Center may also be reached by Fax at 1- 800 - 358 -9620 and its website at www.msc.fema.gov, 3948 000 M ° 39' 00 " 3947 000 M 10 000 FEET FEET MAP REPOSITORY Refer to listing of Map Repositories on Map Index or visit www.ncfloodmaps.com. EFFECTIVE DATE OF FLOOD INSURANCE RATE MAP PANEL MAY 2, 2006 EFFECTIVE DATE(S) OF REVISION(S) TO THIS PANEL For community map revision history prior to statewide mapping, refer to the Community Map History table located In the Flood Insurance Study report for this jurisdiction. To det e rmine if fl oo d insurance is available in this community, contact your insurance agent, the e North Carolina Division of Emergency Management or the National Flood Insurance Program at the following phone numbers or websites: NC Division of Emergency Management National Flood Insurance Program (919) 715 -8000 www.nccrimecontrol.org /nfip 1- 800 - 638 -6620 www.fema.gov/nflp Z& GRID NORTH MAP SCALE 1" = 500' (1 : 6,000) 250 0 500 1000 FEET METERS 150 0 150 300 ZYT41911[. ,. FIRM FLOOD INSURANCE RATE MAP WIN (SEE LOCATOR DIAGRAM OR MAP INDEX FOR FIRM PANEL LAYOUT) CONTAINS: COMMUNITY CID No. PANEL SUFFIX HOLLY SPRINGS, TOWN OF 370403 0649 1 WAKE COUNTY 370368 0649 1 Notice to User: The Map Number shown below should be used when placing map orders; the Community Number shown above should be used on Insurance applications for the subject community. EFFECTIVE DATE MAP NUMBER MAY 2, 2006 31200649001 aYS.SYATE4.: �,yA/ R��F a O F - .r�'.Wumva�s. �lgNll SE{'� State of North Carolina Federal Emergency Management Agency LEGEND FEET SPECIAL FLOOD HAZARD AREAS (SFHAs) SUBJECT TO )0 000 FEET:„ INUNDATION BY THE 1% ANNUAL CHANCE FLOOD The 1 % annual chance flood (100 -year flood), also known as the base flood, is the flood that has a 1 % chance of being equaled or exceeded in any given year. The Special Flood Hazard Area is the area subject to flooding by the 1 % annual chance flood. Areas of Special Flood Hazard include Zones A, AE, AH, AO, AR, A99, V, and VE. The Base Flood Elevation is the water - surface elevation of the 1% annual chance flood. ZONE A No Base Flood Elevations determined. ZONE AE Base Flood Elevations determined. ZONE Ali Flood depfihs of 1 to 3 feet (usually areas of pondingl; Base Flood Elevations determined. ZONE AO Flood depths of 1 to 3 feet (usually sheet flow on sloping terrain); average depths determined. For areas of alluvial fan flooding, velocities also determined. ZONE AR Special Flood Hazard Area formerly protected from the 1% annual chance flood by a flood control system that was subsequently decertified. one AR indicates that the former flood control system is being restored to provide protection from the 1 % annual chance or greater flood. ZONE A99 Area to be protected from 1 % annual chance flood by a Federal flood protection system under construction; no Base Flood Elevations determined. ZONE VE Coastal flood zone with velocity hazard (wave action); Base Flood Elevations Town of determined. Holly Springs :� FLOODWAY AREAS IN ZONE AE Extraterritorial .. The floodway is the channel of a stream plus any adjacent floodplain areas that must be Jurisdiction kept free of encroachment so that the 1?/. annual chance flood can be carried without substantial increases in flood heights. 370403 OTHER FLOOD AREAS ZONE X Areas of 0.2 % annual chance flood; areas of future conditions 1% annual chance flood; areas of 1% annual chance flood with average depths of less °40' 00" than 1 foot or with drainage areas less than 1 square mile; and areas protected by levees from 1% annual chance flood. 7 500 FEET OTHER AREAS ZONE X Areas determined to be outside the 0.2% annual chance and future conditions 1 % annual chance floodplain. 3949 000 M ZONE D Areas in which flood hazards are undetermined, but possible. F77\ COASTAL BARRIER RESOURCES SYSTEM (CBRS) AREAS \' \ OTHERWISE PROTECTED AREAS (OPAs) CBRS areas and OPAs are normally located within or adjacent to Special Flood Hazard Areas. -- -� 1% annual chance floodplain boundary 0.2% annual chance floodplain boundary and future conditions 1% annual chance floodplain boundary — — — — Floodway boundary - - Zone D Boundary •••••••••••••••••••• CBRS and OPA boundary w%N Boundary dividing Special Flood Hazard Area Zones and -- boundary dividing Special Flood Hazard Areas of different s2_ i Base Flood Elevations, flood depths or flood velocities. _513— Base Flood Elevation line and value; elevation in feet* (EL 987) Base Flood Elevation value where uniform within zone; elevation In feet* *Referenced to the North American Vertical Datum of 1988 Cross section line 23 - - - - -- 23 Transect line Geographic coordinates referenced to the North American I 97'07'3011, 32° 22' 30 ° Datum of 1983 (NAD 83) 4276000M 1000 -meter Universal Transverse Mercator grid ticks, zone 17 1 477 500 FEET 2500 -foot grid values: North Carolina State Plane coordinate system (FIPSZONE 3200, State Plane NAD 83 feet) BM5510 North Carolina Geodetic Survey bench mark (see explanation X in the Datum Information section of this FIRM panel). BM5510 National Geodetic Survey bench mark (see explanation in ® the Datum Information section of this FiRM panel). 039' 30" ® M1.5 River Mile 3948 000 M ° 39' 00 " 3947 000 M 10 000 FEET FEET MAP REPOSITORY Refer to listing of Map Repositories on Map Index or visit www.ncfloodmaps.com. EFFECTIVE DATE OF FLOOD INSURANCE RATE MAP PANEL MAY 2, 2006 EFFECTIVE DATE(S) OF REVISION(S) TO THIS PANEL For community map revision history prior to statewide mapping, refer to the Community Map History table located In the Flood Insurance Study report for this jurisdiction. To det e rmine if fl oo d insurance is available in this community, contact your insurance agent, the e North Carolina Division of Emergency Management or the National Flood Insurance Program at the following phone numbers or websites: NC Division of Emergency Management National Flood Insurance Program (919) 715 -8000 www.nccrimecontrol.org /nfip 1- 800 - 638 -6620 www.fema.gov/nflp Z& GRID NORTH MAP SCALE 1" = 500' (1 : 6,000) 250 0 500 1000 FEET METERS 150 0 150 300 ZYT41911[. ,. FIRM FLOOD INSURANCE RATE MAP WIN (SEE LOCATOR DIAGRAM OR MAP INDEX FOR FIRM PANEL LAYOUT) CONTAINS: COMMUNITY CID No. PANEL SUFFIX HOLLY SPRINGS, TOWN OF 370403 0649 1 WAKE COUNTY 370368 0649 1 Notice to User: The Map Number shown below should be used when placing map orders; the Community Number shown above should be used on Insurance applications for the subject community. EFFECTIVE DATE MAP NUMBER MAY 2, 2006 31200649001 aYS.SYATE4.: �,yA/ R��F a O F - .r�'.Wumva�s. �lgNll SE{'� State of North Carolina Federal Emergency Management Agency GRAPHIC SCALE 200 0 100 200 400 I inch = 200 ft. 0 u JSWMF #sD 0 #OFF F 0,01 NOTE: DETAILED TN EXPORT/OFFSET PAYMENT WERE PERFORMED • PHASE No ` SECTION 1 OF THE PROJECT ONLY. THESE ALCULATIONS WILL NEED TO BE REVISED AS FUTURE PHASE S/OUTPARCELS OF THE PROJECT ARE DEVELOPED. m FEZ ®r LEGEND TOTAL PROJECT NITROGEN ANALYSIS AREA PHASE 1 SECTION 1 NITROGEN ANALYSIS AREA MEASURED IMPERVIOUS AREA MEASURED WOODED AREA AREAS EXCLUDED FROM NITROGEN CALCS BYPASS /UNTREATED IMPERVIOUS AREAS �� f M. ta &S � � Y'a9-