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560.3 . the omci8.J. designated by the commu- nity under ~59.22(a)(9)(iii); (5) Require, for all new construction and substantial improvements, that fully enclosed areas below the lowest floor that are usable solely for parking of vehicles, building access or storage in an area other than a basement and which are subject to flooding shall be designed to automatic:ally equalize hy- drostatic flood forces on exterior walls by allowing for the entry and exit of floodwaters. Designs for meeting this requirement must either be certified by a registered profe5llional engineer or architect or meet or exceed the follow- ing minimum criteria: 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 shall be provided. The bottom of all openings shall be no higher than one foot above grade. Openings may be equipped with screens, louvers, valves, or other coverings or devices provided that they permit the automatic entry and exit of floodwaters. (6) Require that manufactured homes that are placed or substantially im- proved within Zones Al-30, AH, and AE on the community's FIRM on sites .(i) Outside of a manufactured home park or subdivision, (ii) In a new manufactured home park or subdivision, (iii) In an expansion to an existing manufactured home park or subdivi- sion. or (iv) In an existing manufactured home park or subdiVision on which a manufactured home has incurred "sub- stantial namage" as the result of a flood, be elevated on a permanent foun- dation such that the lowest floor of the manufactured home is elevated to or above the base flood elevation and be securely anchored to an adequatelY an- chored foundation system to resist floatation collapse and lateral move- ment. (7) Require within any AO zone on the community's FIRM that all new construction and substantial improve- ments of residential structures have the lowest floor (including basement) elevated above the highest adjacent grade at least as high as the depth number specified in feet on the commu- . . " 44 CFR Ch. I (llH-97 Edition) nity's FIRM (at least two feet if no depth nUlllber is specified); (8) Require within any AO zone on the community's FffiM that all new construction and substantial improve- ments of nonresidential structures (i) have the lowest floor (including base- ment) elevated above the highest adja- cent grade at least as high as the depth number specified in feet on the commu- nity's FIRM (at least two feet if no depth number is specified), or (ii) to- gether with attendant utility and sani- tary facili ties be completely floodproofed to that level to meet the floodproo!"mg standard specified in ~60.3(c)(3)(ii); (9) Require within any A99 zones on a community's FIRM the standards of paragraphs (a)(l) through (a)(4)(i) and (b)(5) through (b)(9) of this section; , (10) Require until a regulatory floodway is designated, that no new construction, substantial improve- ments, or other development (including fill) shall be permitted within Zones Al-30 and AE on the community's FIRM, unless it is demonstrated that the cumula.tive effect of the proposed development, when combined with all other existing and anticipated develo~ ment, will not increase the water sur- face elevation of the base flood more than one foot at any point within the community. (11) Require within Zones AH and AO. adequate drainage paths around struc- tures on slopes, to guide floodwate1'S around and away from proposed struc- tures. (12) Require that manufactured homes to be placed or substantially im- proved on sites in an existing man11fae- tured home park or subdivision within Zones A-l-30, AH, and AE on the com- munity's FIRM that are not SUbject to the provisions of paragraph (c)(6) of this section be elevated so that either (i) The lowest floor of the manufac- tured home is at or above the base flood elevation, or (ii) The manufactnred home chassis is supported by reinforced piers or other foundation elements of at least equivalent strength that are no less than 36 inches in height above grade and be securely anchored to an ade- quatelY anchored foundation system to ,", ' ..... . -.-", -..:... ..... . ....- . .': .-:':>:. ..' 238