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Floodplain Management Permit Process. In 100-Yr (1% Chance) Floodplain? a. Document how determined. b. Continue permit process. YES Determine if: 1. General.

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Presentation on theme: "Floodplain Management Permit Process. In 100-Yr (1% Chance) Floodplain? a. Document how determined. b. Continue permit process. YES Determine if: 1. General."— Presentation transcript:

1 Floodplain Management Permit Process

2 In 100-Yr (1% Chance) Floodplain? a. Document how determined. b. Continue permit process. YES Determine if: 1. General Floodplain (GFP) 2. Flood Fringe (FF), or 3. Floodway (FW) NO FLOOD FRINGE PERMITTED USES Document permitted use standards met: aFlood Protection Elevation (FPE) bFill elevation w/in 15’ of structure cDryland access FOLLOW 12-STEP PROCESS Meets Stds? Deny permit NO YES GFP (“A Zone”) FF Determine if site is in FW or FF; Calculate the 1% chance flood elevation & FW/ FF boundary Registered P.E. must do study If Floodway – Go to FW process If Flood Fringe – Go to FF process YES NO FLOODWAY PERMITTED USES Document permitted use standards met: aLow damage potential bAssociated with permanent open space use cDoes not obstruct flows (0.01 foot standard)e dNo permanent structures Meets Stds? aIssue permit bInspect FW Floodplain Permit Process

3 12-Step Permit Process Applicant submits project description Determine project location Determine flood zone at site Determine applicable standards Can the project meet the standards? Check for substantial improvement

4 12-Step Permit Process Check for other required permits Verify structure’s proposed lowest floor elevation (LFE) Issue permit (include E.C. in file) Verify LFE after 1 st pour Verify as-built LFE Issue Certificate of Occupancy

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6 Elevation Certificate Form Download from: NFIP Surveyor Training : Information for Local Officials:

7 NFIP ELEVATION / FLOODPROOFINGCERTIFICATES Serve as record of lowest floor elevation Necessary to obtain actuarial insurance rating CRS credit

8 NEW Elevation Certificate

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10 DIAGRAM 1 All slab-on-grade single- and multiple-floor buildings (other than split-level) and high-rise buildings, either detached or row type (e.g., townhouses); with or without attached garage. Distinguishing Feature – The bottom floor is at or above ground level (grade) on at least one side. * * NEXT HIGHER FLOOR BOTTOM FLOOR b a GRADE ffff (determined by existing grade) gggg

11 NEXT HIGHER FLOOR BOTTOM FLOOR b a GRADE ffff (determined by existing grade) gggg Elevation Certificate – Diagram 1 “Lowest Floor” for Insurance Purposes “Lowest Floor” = lowest habitable floorRFPE

12 Basement Below Grade on All Sides Grade Next Higher Floor Basement

13 Elevation Certificate – Diagram 2 Basement BOTTOM FLOOR (BASEMENT) NEXT HIGHER FLOOR b a GRADE ffff (determined by existing grade) gggg If Residential

14 Elevation Certificate – Diagram 3 BOTTOM FLOOR NEXT HIGHER FLOOR HIGHER FLOORS bbbb aaaa GRADE ffff (determined by existing grade) gggg Basement Lowest Floor RFPE

15 ELEVATING WITH METHODS OTHER THAN FILL

16 ALTERNATIVE ELEVATING METHODS Only apply to N/C structures Only apply to N/C structures Examples:  Pilings/Piers  Basements with openings  Internally flooded crawl spaces

17 Elevation Certificate – Diagram 7 NEXT HIGHER FLOOR bbbb ffff gggg WALKOUT LEVEL OPENINGSOPENINGS* OPENINGS aaaa Basement Enclosure below Lowest Floor

18 Enclosure That Portion of an Elevated Building Below the Lowest Elevated Floor that is Either Partially or Fully Shut-in by Rigid Walls. That Portion of an Elevated Building Below the Lowest Elevated Floor that is Either Partially or Fully Shut-in by Rigid Walls.

19 Bayport Condos DRYFLOODED

20 NEXT HIGHER FLOOR aaaa OPENINGSOPENINGS** OPENINGSCRAWL SPACE ffff gggg bbbb Elevation Certificate – Diagram 8

21 Internally Flooded Crawl Space Crawl space not a basement (not sub-grade on all sides) Crawl space not a basement (not sub-grade on all sides) Top of floor of crawl space not lowest floor since it is properly internally flooded.** Top of floor of crawl space not lowest floor since it is properly internally flooded.** **Note: Crawl space can be used for limited storage, parking of vehicles and building access only. Grade Main Level top of main level floor is lowest floor level RFPE

22 Criteria for Elevation on Perimeter Wall Foundations All A Zones, with low-velocity flooding (less than 5 feet per second) The inside grade of the crawlspace floor must match the outside grade on at least one side of the building. Designed to automatically equalize hydrostatic flood forces on exterior walls by allowing for the entry and exit of floodwaters

23 Minimum Standards for Foundation Openings A minimum of two openings having a total net area of not less than one square inch for every square foot of enclosed area subject to flooding. The bottom of all openings shall be no higher than one foot above grade. Openings may be equipped with screens, louvers, valves, or other “automatic” coverings

24 Caveats for Enclosed Areas Under Lowest Floors flood insurance rating requirements Additional flood insurance rating requirements so the enclosed area is not considered a basement:  the automatic openings are on at least 2 sides of the structure, and  The enclosed space cannot be finished (no finished wall-paneling, flooring, etc.) (source: Flood Insurance Manual, Page LFG 1)

25 Lowest Floor Opening (typical) 1 foot Crawl Space Foundation with Openings

26 Walkout Lower Level Not at RFPE With Internal Flooding** Lower Level Grade Grade RFPE top of lower level floor is lowest level Garage **Internal Flooding Meets TB 1-93 and space used only for storage, access and vehicle storage

27 Walkout Lower Level Not at RFPE Upper Level Lower Level Garage Grade Grade RFPE top of lower level floor is lowest level Note: NO Internal Flooding (Not Permitted)

28 Basement Example Main Level Basement Garage Grade RFPE top of basement floor is lowest floor level (Not Permitted)

29 Crawl Space Example This crawl space IS considered a basement (since it is sub-grade on all sides). It is NOT ALLOWED. top of crawl space floor is lowest floor level Grade Grade Main Level Garage Crawl Space RFPE (Not Permitted)

30 Is this a Basement? RFPE

31 Lowest Floor Elevations Basement Foundation Basement Lowest Floor

32 Walkout Lower Level AT RFPE Upper Level Lower Level Garage Grade RFPE top of lower level floor is lowest floor level

33 Floodplain Permit Process Floodway (FW), Flood Fringe (FF) or General Floodplain (GFP) NO a.Document how determined. b.Continue normal permit process. In 1% Chance Floodplain? FF FW Determine if FW or FF & BFE Detailed (PE) GFP “A Zone” YES

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35 FF Permit Process Permitted Use (elevated on fill)? NO Go to Variance Process YES Determine & Document: a. RFPE b. Fill elevation w/in 15’ c. Dryland access

36 Flood Fringe Basics Standards for Permitted Structures Top of lowest floor, including basement, at FPE Fill at RFE plus one foot Fill extends 15 feet from structure Access road at or above RFE

37 State Minimums for Structures in Flood Fringe Areas Top of Floor at FPE* *FPE = 100-year flood (RFE) + 2' (minimum) >1’ 100-year flood elevation (RFE) > 15' Not to Scale

38 Standards for Elevation on Fill... Fill should extend a minimum of 15 feet beyond all sides of the structure Erosion protection is required for high velocities / steep slopes

39 Standards for Elevation on Fill Fill should be placed in maximum 12- inch lifts, and compacted to 95% of the maximum density obtainable with the Standard Proctor Test Method Fill slopes should be no steeper than 1.0- foot vertical to 1.5-feet horizontal

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41 c.*Calculation of Regulatory Flood Protection Elevation (RFPE)* d.Regional Flood (100-yr.) Elevation: = e.Freeboard Fill Req’d by ordinance = 1.0 f.FPE: = 1.0 (add above) =

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43 1.Structure’s Elevation Requirements In:[ ] N.G.V.D. [ ] Assumed Datum [ ] In relation to street proposed required a.Basement or lowest floor = ________ - __________ b.First Floor (above grade): = ________ - __________ c.Max. Building height: = _______ - ________ d.Fill Elev. Adjacent to Structure: = ________ - ________ 1091 x

44 Elevation Certificate (As Built)

45 Required By Actual Ordinance As- Built 2. Structure: a. Elevation of first floor: =_________ - _______ b. Basement elevations: =_________ - _______ b. Lowest adjacent grade: =_________ - _______ c. Highest adjacent grade: =_________ - _______ 3. Sewer: a. Top of septic or holding tank: =_________ - _______ b. Bottom of drainfield trench or bed: =_________ - _______ 4. Low point of access/road: =_________ - _______ 5. Compacted fill elevation around building: =_________ - _______ 6. Top of well casing: =_________ - _______ 7. Elevation to which structure is flood proofed: =_________ - _______ 1093 (no basement) 1092NANA NA1093

46 NEW Elevation Certificate

47 Where are the vents?

48 ? Picture Is this really 1 foot ….or less?

49 Don’t Forget Manufactured Homes, Mobile Homes, etc

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53 Manufactured home park

54 Recreational Vehicles – WI Sample Ordinance Basics

55 Floodplain Campgrounds The campground is approved by the Department of Health and Family Services. A land use permit for the campground is issued by the zoning administrator. The character of the river system and the elevation of the campground is such that a 72-hour warning of a flood can be given to all campground occupants. Adequate flood warning procedure and coordination with emergency government and sheriff’s office which specifies the flood elevation at which evacuation shall occur, personnel responsible for monitoring flood elevations, types of warning systems and the procedures for notifying at-risk parties. Agreement reviewed and updated every year to remain in compliance with all applicable regulations. Only camping units are allowed. The camping units may not occupy any site in the campground for more than 180 consecutive days.

56 Floodplain Campgrounds All camping units that remain on site for more than 30 days shall be issued a limited authorization by the campground operator, a written copy of which is kept on file at the campground. Such authorization shall allow placement of a camping unit for a period not to exceed 180 days and shall ensure compliance with all the provisions of this section. The municipality shall monitor the limited authorizations issued by the campground operator to assure compliance with the terms of this section. All camping units that remain in place for more than 180 consecutive days must meet the applicable requirements in either s. 3.0 or s. 4.0 for the floodplain district in which the structure is located. The campground shall have signs clearly posted at all entrances warning of the flood hazard and the procedures for evacuation when a flood warning is issued. All service facilities, including but not limited to refuse collection, electrical service, natural gas lines, propane tanks, sewage systems and wells shall be properly anchored and placed at or floodproofed to the flood protection elevation

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60 Road Construction It is development It does require a land use permit If in floodway, impacts must be analyzed If the project causes any increase in RFE, practicable alternatives must be reviewed and implemented if feasible If none exist, can proceed with CLOMR

61 Road Construction When completed, CLOMR data must be adopted by community All affected property owners must be notified of any RFE increase Flood easements must still be obtained before project can proceed These rules apply to any road project not funded or managed by DOT


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