FloodplainFloodplainManagementManagement

Permit Process Permit Process

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 structurecDryland access

FOLLOW 12-STEP PROCESS

Meets Stds?Deny permitNO

YES

GFP (“A Zone”)

FF

Determine if site is in FW or FF; Calculate the 1% chance flood elevation

& FW/ FF boundaryRegistered 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 potentialbAssociated with permanent open space use cDoes not obstruct flows (0.01 foot standard)edNo permanent structures

Meets Stds?

aIssue permitbInspect

FW

Floodplain Permit ProcessFloodplain Permit Process

12-Step Permit Process12-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

12-Step Permit Process12-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

Elevation Certificate FormElevation Certificate Form

Download from:www.fema.gov/nfip/elvinst.htmwww.fema.gov/nfip/elvinst.htmNFIP Surveyor TrainingNFIP Surveyor Training::

http://training.nfipstat.com/ecsurveyor/

Information for Local Officials: http://www.fema.gov/business/nfip/infosl.shtm

NFIP ELEVATION / NFIP ELEVATION / FLOODPROOFINGFLOODPROOFING CERTIFICATESCERTIFICATES

Serve as record of lowest floor elevation

Necessary to obtain actuarial insurance rating

CRS credit

NEW NEW Elevation Elevation CertificateCertificate

NEW Elevation CertificateNEW Elevation Certificate

DIAGRAM 1DIAGRAM 1

All slab-on-grade single- and multiple-All slab-on-grade single- and multiple-floor buildings (other than split-level) floor buildings (other than split-level) and high-rise buildings, either detached and high-rise buildings, either detached or row type (e.g., townhouses); with or or row type (e.g., townhouses); with or without attached garage.without attached garage.Distinguishing Feature – The bottom floor is at or Distinguishing Feature – The bottom floor is at or above ground level (grade) on at least one side. * above ground level (grade) on at least one side. *

NEXT HIGHER FLOOR

BOTTOM FLOOR

ba

GRADE

ff (determined by existing (determined by existing grade)grade)

gg

NEXT HIGHER FLOOR

BOTTOM FLOOR

b

a

GRADE

ff (determined by existing grade)gg

Elevation Certificate – Diagram 1Elevation Certificate – Diagram 1•“Lowest Floor” for Insurance Purposes

•“Lowest Floor” = lowest habitable floor

RFPERFPE

BasementBasementBelow Grade on All Sides

GradeGrade

Next Higher Next Higher FloorFloor

BasementBasement

Elevation Certificate – Diagram 2 Elevation Certificate – Diagram 2 BasementBasement

BOTTOM FLOOR(BASEMENT)

NEXT HIGHERFLOOR

b

a

GRADE

f (determined by existing grade)g

If ResidentialIf Residential

Elevation Certificate – Diagram 3Elevation Certificate – Diagram 3

BOTTOMFLOOR

NEXT HIGHERFLOOR

HIGHERFLOORS b

a

GRADEf (determined by existing grade)(determined by existing grade)g

•Basement

•Lowest Floor

RFPERFPE

ELEVATING WITH ELEVATING WITH METHODS OTHER THAN METHODS OTHER THAN

FILLFILL

ALTERNATIVE ELEVATING ALTERNATIVE ELEVATING METHODSMETHODS

Only apply to N/C structuresOnly apply to N/C structures Examples:

Pilings/PiersBasements with openingsInternally flooded crawl spaces

Elevation Certificate – Diagram 7Elevation Certificate – Diagram 7

NEXT HIGHERFLOOR

bb

ffggWALKOUT WALKOUT

LEVELLEVEL

OPENINGS*OPENINGS*

aa

•Basement

•Enclosure below Lowest Floor

EnclosureEnclosure That Portion of That Portion of

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

Bayport CondosBayport Condos

DRYDRY FLOODEDFLOODED

NEXT HIGHERFLOOR

a

OPENINGS** CRAWL SPACE

f

g

b

Elevation Certificate – Diagram 8Elevation Certificate – Diagram 8

Internally Flooded Crawl SpaceInternally 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 Top of floor of crawl space not lowest floor since it is

properly internally flooded.**properly internally flooded.**

**Note: Crawl **Note: Crawl space can be used space can be used

for limited for limited storage, parking storage, parking of vehicles and of vehicles and building access building access

only.only.GradeGrade

Main Level

top of main level floor is lowest floor leveltop of main level floor is lowest floor level

RFPE

Criteria for Elevation on Criteria for Elevation on Perimeter Wall FoundationsPerimeter Wall Foundations

Criteria for Elevation on Criteria for Elevation on Perimeter Wall FoundationsPerimeter 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

Minimum Standards for Minimum Standards for Foundation OpeningsFoundation Openings

Minimum Standards for Minimum Standards for Foundation OpeningsFoundation 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

Caveats for Enclosed Areas Caveats for Enclosed Areas Under Lowest FloorsUnder Lowest Floors

Additional flood insurance rating flood insurance rating requirementsrequirements 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)

LowestFloorOpening

(typical)

1 foot

Crawl Space Foundation Crawl Space Foundation with Openingswith Openings

Walkout Lower Level Not at RFPEWalkout Lower Level Not at RFPEWith Internal Flooding**With Internal Flooding**

Lower Level

GradeGradeGradeGrade

RFPE

top of lower level floor is lowest leveltop of lower level floor is lowest level

Garage

**Internal Flooding Meets TB 1-93 and space **Internal Flooding Meets TB 1-93 and space used only for storage, access and vehicle storageused only for storage, access and vehicle storage

Walkout Lower Level Not at RFPEWalkout Lower Level Not at RFPE

Upper Level

Lower Level

Garage GradeGradeGradeGradeRFPERFPE

top of lower level floor is lowest leveltop of lower level floor is lowest level

Note: NO Internal FloodingNote: NO Internal Flooding

(Not Permitted)(Not Permitted)

Basement ExampleBasement Example

Main Level

Basement

GarageGradeGrade

RFPE

top of basement floor is lowest top of basement floor is lowest floor levelfloor level

(Not Permitted)(Not Permitted)

Crawl Space Example Crawl Space Example

This crawl space IS considered a basement (since it This crawl space IS considered a basement (since it is sub-grade on all sides). It is NOT ALLOWED.is sub-grade on all sides). It is NOT ALLOWED.

top of crawl space floor is lowest floor leveltop of crawl space floor is lowest floor level

GradeGradeGradeGradeMain Level Garage

Crawl Space

RFPE

((Not Permitted)Not Permitted)

Is this a Basement?Is this a Basement?

RFPE

Lowest Floor ElevationsLowest Floor ElevationsBasement FoundationBasement Foundation

BasementLowest Floor

Lowest Floor

Walkout Lower Level AT RFPEWalkout Lower Level AT RFPE

Upper Level

Lower Level

GarageGradeGrade

RFPE

top of lower level floor is lowest top of lower level floor is lowest floor levelfloor level

Floodplain Permit ProcessFloodplain Permit Process

Floodway (FW), Flood Fringe (FF) or General Floodplain

(GFP)

NOa. 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

FF Permit ProcessFF 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

Flood Fringe BasicsFlood Fringe BasicsStandards for Permitted Standards for Permitted

StructuresStructures• 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

State Minimums for Structures State Minimums for Structures in Flood Fringe Areasin Flood Fringe Areas

Top of Floor at FPE*

*FPE = 100-year flood (RFE) + 2' (minimum) *FPE = 100-year flood (RFE) + 2' (minimum)

>1’

100-year flood 100-year flood elevation (RFE)elevation (RFE)

> 15'> 15'> 15'> 15'

Not to ScaleNot to Scale

Standards for Elevation on Standards for Elevation on Fill...Fill...

Standards for Elevation on Standards for Elevation on Fill...Fill...

Fill should extend a minimum of 15 feet beyond all sides of the structure

Erosion protection is required for high velocities / steep slopes

Standards for Elevation on FillStandards for Elevation on FillStandards for Elevation on FillStandards 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

c. *Calculation of Regulatory Flood Protection Elevation (RFPE)*

d. Regional Flood (100-yr.) Elevation: = 1091.0

e. Freeboard Fill Req’d by ordinance = 1.0

f. FPE: = 1.0 (add above) = 1093.0

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

1093

1092

Elevation Elevation Certificate Certificate (As Built)(As Built)

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: =_________ - _______

10931093

(no basement)(no basement)

10921092

NANA

NANA

10911091

10921092

NANA

10931093

NEW NEW Elevation Elevation CertificateCertificate

Where are the vents?Where are the vents?

?Picture

Is this really 1 foot ….or less?

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

MANUFACTURED HOMEANCHORING ON A PIER FOUNDATION

GROUND ANCHORS

MANUFACTURED HOMEANCHORING ON POST OR

PILE FOUNDATIONS

OVER-THE-TOP TIES

MANUFACTURED HOMEANCHORING ON POST OR

PILE FOUNDATIONS

FRAME TIES

Manufactured home park

Recreational Vehicles – WI Recreational Vehicles – WI Sample Ordinance BasicsSample Ordinance Basics

Floodplain CampgroundsFloodplain 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.

Floodplain CampgroundsFloodplain 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

Road ConstructionRoad 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

Road ConstructionRoad 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