Engineering No-Rise Certification Information and Instructions

Engineering “No-Rise” Certification

Information and Instructions

Engineering “No-Rise” Certification Required

Section 60.3(d)(3) of the National Flood Insurance Program (NFIP) requires that the City prohibit encroachments, including fill, new construction, substantial improvements, and other development within the adopted regulatory floodway unless it has been demonstrated through hydrologic and hydraulic analyses performed in accordance with standard engineering practice that the proposed encroachment would not result in any increase in flood levels within the city during the occurrence of the base (100-year) flood discharge.

Supporting Technical Data Required

The “No-Rise Certificate” must be supported by technical data based upon the standard step-backwater computer model utilized to develop the 100-year floodway shown on the City’s effective Flood Insurance Rate Map (FIRM) or Flood Boundary and Floodway Map (FBFM) and the results tabulated on the City’s Flood Insurance Study (FIS).

Current Effective Model

To request information on data and how to revise or modify the model, contact the following agencies:

FEMA, Region VIII Mitigation Division Building 710, Denver Federal Center P.O. Box 25267 Denver, Co. 80225-0267 Telephone: 303-235-4830 Fax: 303-235-4849

FEMA Project Library Michael Baker, Jr. Inc. 3601 Eisenhower Avenue, Suite 600 Alexandria, VA 22304 Telephone: 703-960-8800 Fax: 703-960-9125

Federal Emergency Management Agency Flood Hazard Mapping Technical Division Telephone: 1-877-FEMA MAP www.fema.gov email: [email protected]

D:\Docs\2018-04-16\042f47be9e7a02f839cde3f1dd31ea5e.doc 1 Submittals

“No-Rise” Certificate (copy attached)

Supporting data should include, but is not limited to, the following:

Duplicate of the original FIS step-backwater model printout or floppy disk. Revised existing conditions step-backwater model. Proposed conditions step-backwater model. FIRM and topographic map, showing floodplain and floodway, the additional sections, the site location with the proposed topographic modification superimposed onto the maps, and a photo copy of the effective FIRM showing the current regulatory floodway. Documentation clearly stating analysis procedures. All modifications made to the original FIS model to represent revised existing conditions, as well as those made to the revised existing conditions model to represent proposed conditions, should be well documented and submitted with all supporting data. Copy of effective Floodway Data Table copied from the FIS Report. Statement defining source of additional cross section topographic data and supporting information. Cross section plots of the added cross-sections, for revised existing and proposed conditions. Certified planimetric (boundary survey) information indicating the location of structure on the property. Copy of the microfiche, or other applicable source, from which input for original step-backwater model was taken. Floppy disk with all input files.

Notice

If published floodway widths are changed as a result of the encroachment, then a floodway revision will be required as described in part 65.7 of the National Flood Insurance Program regulations.

Send Submittals To

Planning and Building Services Department Ground Floor City Hall 224 West Ninth Street P.O. Box 7402 Sioux Falls, SD 57117-7402 605-367-8254 Email: [email protected] Website: www.siouxfalls.org/building

D:\Docs\2018-04-16\042f47be9e7a02f839cde3f1dd31ea5e.doc 2 “NO-RISE” CERTIFICATION

This is to certify that I am a duly qualified registered professional engineer licensed to practice in the State of .

It is further to certify that the attached technical data supports the fact that proposed (Name of Development) will not impact the 100-year flood elevations, floodway elevations, or floodway widths on (Name of Stream) at published sections in the Flood Insurance Study for (Name of Community) dated (Study Date) and will not impact the 100-year flood elevations, floodway elevations, or floodway widths at unpublished cross sections in the vicinity of the proposed development.

Attached are the following documents that support my findings:

Signature:

Title:

{SEAL}

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