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Home My WebLink AboutFDP202000015 Other 2020-08-20 (5)U.S. DEPARTMENT OF HOMELAND SECURITY FEDERAL EMERGENCY MANAGEMENT AGENCY O.M.B No. I660-00I6 RIVERINE HYDROLOGY & HYDRAULICS FORM Expires February 28, 2014 PAPERWORK BURDEN DISCLOSURE NOTICE Public reporting burden for this form is estimated to average 3.5 hours per response. The burden estimate includes the time for reviewing instructions, searching existing data sources, gathering and maintaining the needed data, and completing, reviewing, and submitting the form. You are not required to respond to this collection of information unless a valid OMB control number appears in the upper right corner of this form. Send comments regarding the accuracy of the burden estimate and any suggestions for reducing this burden to: Information Collections Management, Department of Homeland Security, Federal Emergency Management Agency, 1800 South Bell Street, Arlington VA 20958-3005, Paperwork Reduction Project (1660-0016). Submission of the form is required to obtain or retain benefits under the National Flood Insurance Program. Please do not send your completed survey to the above address. PRIVACY ACT STATEMENT AUTHORITY: The National Flood Insurance Act of 1968, Public Law 90-448, as amended by the Flood Disaster Protection Act of 1973, Public Law 93-234. PRINCIPAL PURPOSE(S): This information is being collected for the purpose of determining an applicant's eligibility to request changes to National Flood Insurance Program (NFIP) Flood Insurance Rate Maps (FIRM). ROUTINE USE(S): The information on this form may be disclosed as generally permitted under 5 U.S.0 § 552a(b) of the Privacy Act of 1974, as amended. This includes using this information as necessary and authorized by the routine uses published in DHS/FEMA/NFIP/LOMA-1 National Flood Insurance Program (NFIP); Letter of Map Amendment (LOMA) February 15, 2006, 71 FR 7990. DISCLOSURE: The disclosure of information on this form is voluntary; however, failure to provide the information requested may delay or prevent FEMA from processing a determination regarding a requested change to a NFIP Flood Insurance Rate Maps (FIRM). Flooding Source: Rivanna River Note: Fill out one form for each flooding source studied A. HYDROLOGY 1. Reason for New Hydrologic Analysis (check all that apply) ® Not revised (skip to section B) ❑ No existing analysis ❑ Improved data ❑ Alternative methodology ❑ Proposed Conditions (CLOMR) ❑ Changed physical condition of watershed 2. Comparison of Representative 1%-Annual-Chance Discharges Location Drainage Area (Sq. Mi.) Effective/FIS (cfs) Revised (cfs) 3. Methodology for New Hydrologic Analysis (check all that apply) ❑ Statistical Analysis of Gage Records ❑ Precipitation/Runoff Model 4 Specify Model: ❑ Regional Regression Equations ❑ Other (please attach description) Please enclose all relevant models in digital format maps, computations (including computation of parameters), and documentation to support the new analysis. 4. Review/Approval of Analysis If your community requires a regional, state, or federal agency to review the hydrologic analysis, please attach evidence of approval/review. 5. Impacts of Sediment Transport on Hydrology Is the hydrology for the revised flooding source(s) affected by sediment transport? ❑ Yes ❑ No If yes, then fill out Section F (Sediment Transport) of Form 3. If No, then attach your explanation.. FEMA Form 086-0-27A, (2/2011) Previously FEMA Form 81-89 MT-2 Form 2 Page 1 of 3 B. HYDRAULICS 1. Reach to be Revised Description Cross Section Water -Surface Elevations (ft.) Effective Proposed/Revised Downstream Limit* FIRM:X 37.33 331.7 331.7 Upstream Limit* Route 250 Bridge "Free Bridge" 37.776 333.1 331.9 *Proposed/Revised elevations must tie -into the Effective elevations within 0.5 foot at the downstream and upstream limits of revision. 2. Hydraulic Method/Model Used: Cross Section Survey 3. Pre -Submittal Review of Hydraulic Models* DHS-FEMA has developed two review programs, CHECK-2 and CHECK-RAS, to aid in the review of HEC-2 and HEC-RAS hydraulic models, respectively. We recommend that you review your HEC-2 and HEC-RAS models with CHECK-2 and CHECK-RAS. 4. Models Submitted Duplicate Effective Model* Corrected Effective Model* Existing or Pre -Project Conditions Model Revised or Post -Project Conditions Model Natural Run File Name: Plan Name: Rivanna River Effect EFFECTIVE MU MI 11 TPI F File Name: Plan Name: Floodway Run File Name: Plan Name: Effective Floodway File Name: Plan Name: File Name: Plan Name: File Name: Plan Name: File Name: Plan Name: File Name: Rivanna River Revise REVISED MULTIPL Rivanna River Revise Other - (attach description) File Name: Plan Name: File Name: * For details, refer to the corresponding section of the instructions. ® Digital Models Submitted? (Required) C. MAPPING REQUIREMENTS Datum NAVD88 Plan Name: Revised Floodway NAVD88 Plan Name: A certified topographic work map must be submitted showing the following information (where applicable): the boundaries of the effective, existing, and proposed conditions 1%-annual-chance floodplain (for approximate Zone A revisions) or the boundaries of the 1 %- and 0.29/6-annual-chance floodplains and regulatory floodway (for detailed Zone AE, AO, and AH revisions); location and alignment of all cross sections with stationing control indicated; stream, road, and other alignments (e.g., dams, levees, etc.); current community easements and boundaries; boundaries of the requester's property; certification of a registered professional engineer registered in the subject State; location and description of reference marks; and the referenced vertical datum (NGVD, NAVD, etc.). ® Digital Mapping (GIS/CADD) Data Submitted (preferred) Topographic Information: 2 Work Maps Showing Surveyed Cross Sections Source: Survey, NAVD88 Date: Accuracy: Note that the boundaries of the existing or proposed conditions floodplains and regulatory floodway to be shown on the revised FIRM and/or FBFM must tie-in with the effective floodplain and regulatory floodway boundaries. Please attach a copy of the effective FIRM and/or FBFM, at the same scale as the original, annotated to show the boundaries of the revised 1%-and 0.2%-annual-chance floodplains and regulatory floodway that tie-in with the boundaries of the effective 1%-and 0.2%-annual-chance floodplain and regulatory floodway at the upstream and downstream limits of the area on revision. ® Annotated FIRM and/or FBFM (Required) FEMA Form 086-0-27A, (2/2011) Previously FEMA Form 81-89 MT-2 Form 2 Page 2 of 3 D. COMMON REGULATORY REQUIREMENTS' 1. For LOMR/CLOMR requests, do Base Flood Elevations (BFEs) increase? ❑ Yes ® No a. For CLOMR requests, if either of the following is true, please submit evidence of compliance with Section 65.12 of the NFIP regulations: • The proposed project encroaches upon a regulatory floodway and would result in increases above 0.00 foot compared to pre -project conditions. • The proposed project encroaches upon a SFHA with or without BFEs established and would result in increases above 1.00 foot compared to pre -project conditions. b. Does this LOMR request cause increase in the BFE and/or SFHA compared with the effective BFEs and/or SFHA? ❑ Yes ® No If Yes, please attach proof of property owner notification and acceptance (if available). Elements of and examples of property owner notifications can be found in the MT-2 Form 2 Instructions. 2. Does the request involve the placement or proposed placement of fill? ❑ Yes ®No If Yes, the community must be able to certify that the area to be removed from the special flood hazard area, to include any structures or proposed structures, meets all of the standards of the local floodplain ordinances, and is reasonably safe from flooding in accordance with the NFIP regulations set forth at 44 CFR 60.3(A)(3), 65.5(a)(4), and 65.6(a)(14). Please seethe MT-2 instructions for more information. 3. For LOMR requests, is the regulatory floodway being revised? ® Yes ❑ No If Yes, attach evidence of regulatory floodway revision notification. As per Paragraph 65.7(b)(1) of the NFIP Regulations, notification is required for requests involving revisions to the regulatory floodway. (Not required for revisions to approximate 1%-annual-chance floodplains [studied Zone A designation] unless a regulatory floodway is being established. Elements and examples of regulatory floodway revision notification can be found in the MT-2 Form 2 Instructions.) 4. For CLOMR requests, please submit documentation to FEMA and the community to show that you have complied with Sections 9 and 10 of the Endangered Species Act (ESA). For actions authorized, funded, or being carried out by Federal or State agencies, please submit documentation from the agency showing its compliance with Section 7(a)(2) of the ESA. Please see the MT-2 instructions for more detail. of all see 44 CFR parts 60 and 65. FEMA Form 086-0-27A, (2/2011) Previously FEMA Form 81-89 MT-2 Form 2 Page 3 of 3