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Floodplain Management Permit Process

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Presentation on theme: "Floodplain Management Permit Process"— Presentation transcript:

1 Floodplain Management Permit Process

2 Floodplain Permit Process
In 100-Yr (1% Chance) Floodplain? a. Document how determined b. Continue permit process. NO YES 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 GFP (“A Zone”) Determine if: 1. General Floodplain (GFP) 2. Flood Fringe (FF), or Floodway (FW) FF FW FLOOD FRINGE PERMITTED USES Document permitted use standards met: Flood Protection Elevation (FPE) Fill elevation w/in 15’ of structure Dryland access FLOODWAY PERMITTED USES Document permitted use standards met: Low damage potential Associated with permanent open space use Does not obstruct flows (0.01 foot standard)e No permanent structures NO Deny permit NO Meets Stds? Meets Stds? YES YES FOLLOW 12-STEP PROCESS Issue permit Inspect

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 1st pour Verify as-built LFE Issue Certificate of Occupancy

5 Let's take a look....

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

Serve as record of lowest floor elevation Necessary to obtain actuarial insurance rating CRS credit

8 NEW Elevation Certificate

9 NEW Elevation Certificate

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. * b NEXT HIGHER FLOOR a BOTTOM FLOOR GRADE f g (determined by existing grade)

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

12 Below Grade on All Sides
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 f (determined by existing grade) g If Residential

14 Elevation Certificate – Diagram 3
Basement Lowest Floor BOTTOM FLOOR NEXT HIGHER HIGHER FLOORS b a GRADE f (determined by existing grade) g RFPE


Only apply to N/C structures Examples: Pilings/Piers Basements with openings Internally flooded crawl spaces

17 Elevation Certificate – Diagram 7
Basement Enclosure below Lowest Floor NEXT HIGHER FLOOR b f g WALKOUT LEVEL OPENINGS* a

18 Enclosure 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 DRY FLOODED

20 Elevation Certificate – Diagram 8

21 Internally Flooded Crawl Space
**Note: Crawl space can be used for limited storage, parking of vehicles and building access only. Main Level RFPE Grade top of main level floor is lowest floor level 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.**

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

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

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

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

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

30 Is this a Basement? RFPE

31 Lowest Floor Elevations Basement Foundation

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

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


35 Permitted Use (elevated on fill)?
FF Permit Process Go to Variance Process Permitted Use (elevated on fill)? NO 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 >1’
100-year flood elevation (RFE) Not to Scale Top of Floor at FPE* > 15' > 15' >1’ *FPE = 100-year flood (RFE) + 2' (minimum)

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


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


43 Basement or lowest floor = ________ - __________
Structure’s Elevation Requirements In:[ ] N.G.V.D [ ] Assumed Datum [ ] In relation to street proposed required Basement or lowest floor = ________ - __________ First Floor (above grade): = ________ - __________ Max. Building height: = _______ - ________ Fill Elev. Adjacent to Structure: = ________ - ________ x 1091 1093 1092

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) 1092 NA 1091

46 NEW Elevation Certificate

47 Where are the vents?

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

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




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




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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