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Understanding Active and Passive Floodproofing Options for Non- Residential Buildings in a Special Flood Hazard Area Course Number: SV003 Learning Units:

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Presentation on theme: "Understanding Active and Passive Floodproofing Options for Non- Residential Buildings in a Special Flood Hazard Area Course Number: SV003 Learning Units:"— Presentation transcript:

1 Understanding Active and Passive Floodproofing Options for Non- Residential Buildings in a Special Flood Hazard Area Course Number: SV003 Learning Units: 1 Credit Designation: HSW Provider: Smart Vent Products, Inc Provider number: T058

2 Learning Objectives Identify the applicable ICC building codes and FEMA regulations pertaining to non-residential floodproofing options. Understand the design benefits for each dry floodproofing and wet floodproofing option. Identify design issues and occupants risks associated with active flood proofing techniques and the liability associated with those risks. Analyze the difference between Active and Passive floodproofing techniques and how they affect the buildings sustainability.

3 Course Outline Section 1 General Overview Effects of hydrostatic pressure NFIP (FEMA) Regulations, ICC building codes, ASCE standards Define dry and wet floodproofing techniques Active and passive methods Section 2 Dry Floodproofing Planning considerations & engineering requirements Active vs Passive methods FEMA floodproofing certificate Designer Liability Section 3 Wet Floodproofing Options Engineered vs non-engineered ICC-ES Evaluated Products Project Studies

4 Section 1 Effects of hydrostatic pressure NFIP (FEMA) Regulations, ICC building codes, ASCE standards Define dry and wet floodproofing techniques Active and passive methods

5 Hydrostatic Pressure

6 The Effects of Hydrostatic Force AB CD

7 Floodproofing Options: A Zones Dry Flood ProofingWet Flood Proofing

8 Dry Floodproofing (Resist) Making a building watertight, impermeable to flood waters NFIP allows in non-residential buildings only For new construction or substantial improvements to existing buildings Acceptable in A, AE, A1-A30, AO, & AH Zones Design must be certified (Liability)

9 Wet Floodproofing (Relieve) Flood Vents equalize the hydrostatic pressure NFIP allows in both residential and non-residential structures For new construction or substantial improvements to existing buildings Acceptable in A, AE, A1-A30, AO, & AH Zones ICC-ES Certified Options

10 Additional Floodplain Construction References 2009 IBCASCE 24-05

11 Design Plans

12 Which To Design With? Dry Vs Wet Design differences and costs Active vs Passive approaches

13 Section 2 Dry Floodproofing Design requirements & materials Active & passive flood barriers Flood proofing certificate & liability

14 Dry Floodproofing Planning: Is it possible? – Considerations Warning time, Safety & Access Flood Velocities, Depths, and Debris Frequency Emergency Plan Inspection & Maintenance Plan Cost Liability

15 Warning Time, Safety & Access Time is critical Active flood proofing measures Human Stability Dry Flood Proofing is not appropriate in a flash flood area.

16 Flood Velocities, Depths & Debris Cost Prohibitive When – Flood Velocities are over 5 feet per second – Base Flood depths in excess of 3 feet Impact forces from debris – Calculation assumes 1 second duration of impact – Object estimated at 1,000 pounds

17 Flood Frequency How often Wear & Tear Risks of implementing a emergency plan over and over If frequency is not a factor, time to design

18 Emergency Operation Plan Establish the chain of command & responsibilities Procedure for notifying necessary parties A list of specific duties & location of all dry floodproofing materials Evacuation plan- with and without duties Annual training drills with community officials

19 Inspection & Maintenance Plan Mechanical equipment, sump pumps & generators Inspect & test all flood shields (check gaskets) Inspect foundation walls for cracks Levees & berms

20 Dry Floodproofing Certificate Property Address Section I: FIRM info Section II: Flood proofing design info Section III: Certification

21 Property Address

22 Section I & II

23 Section III

24 Floodplain Impact Consideration Increased flood depths, velocities, & flows Growing the floodplain ASFPM: No Adverse Impact – The action of one property owner or community does not adversely affect another

25 Section 3 Wet Floodproofing (Passive Solution) Engineered vs Non-engineered ICC-ES Evaluated Products Proper Placement

26 Three Options 1.ICC-ES Certified Engineered Openings 2.Unique project specific Engineered Openings 3.Non-engineered Openings Both FEMA and the ICC reference ASCE 24. ASCE requires that flood openings allow for a 3 sphere to pass through to permit for debris. Both FEMA and the ICC reference ASCE 24. ASCE requires that flood openings allow for a 3 sphere to pass through to permit for debris.

27 3. Non-engineered Openings 27

28 Standard foundation air ventilation devices that can be closed manually, unless they are disabled in the open position Unacceptable Measures: Page 19 TB-1

29 Standard foundation air ventilation devices that are designed to open and close based on temperature

30 Unacceptable Measures: Page 19 TB-1 Windows below the BFE Garage Doors without openings installed in them Standard exterior doors without openings installed in them

31 31 Debris is a Fact of Flood

32 3 Clarification

33 2. Unique Engineered Openings Designed for a specific project Certified based on computations (TB1 and ASCE 24) I-Codes & ASCE 24: 3 min dimension Not for mass distributed products Design must be accompanied by the original certification Liability: Licensed Design Professional

34 Unique Engineered Opening Certificate Statement certifying the openings will automatically equalize hydrostatic flood loads Range of flood characteristics used Installation requirements Property address (must be licensed in that state) Licensed design professionals name, title, address, type of license, license number, state in which the license was issued

35 1. ICC-ES Engineered Openings Designed, Tested, & Certified for performance Designed and certified based on computations (TB1 and ASCE 24) ICC-ES Certifed: AC-364 (AFFV) I-Codes & ASCE 24: 3 min dimension

36 ICC-ES Report

37 Liability For Performance Rests on the manufacturers shoulders Each vent is tested Regular QA inspections

38 Placement Requirements

39 FEMA Photo

40 40 Placement Requirements

41 Sloping Sites: Walk Out Basements 41

42 Dry vs Wet William L. Coulbourne, P.E. Floodproofing Report Dry vs Wet Floodproofing Technologies Two dry scenarios Two wet scenarios 5,000 sq. ft. spaces 4 foot BFE with 1 foot freeboard

43 Dry Scenario 1D 5,000 sq. ft. full height enclosed space

44 Dry Scenario 2D 5,000 sq. ft. crawlspace

45 Wet Scenario 1W 5,000 sq. ft. full height enclosed space – (13) ICC-ES certified flood vents

46 Wet Scenario 2W 5,000 sq. ft. crawlspace – (13) ICC-ES certified flood vents

47 Cost Analysis

48 Summary: Considerations Local floodplain ordinances Health, Safety & Welfare of the Occupants Active vs Passive techniques Costs Liability

49


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