HomeMy WebLinkAboutCERTIFICATION OF ENGINEERED FLOOD OPENINGSSCANNED
BY
St. LU019 COMV
Certification of Engineered. flood Openings,
in accordance With NFIP, FRMA TR 1-08 -and ASCM V�
� 0 1 1. �
I hetpb.y certify that the Crawl Space Door Systems flood vents 816CS., 1220CS, 1212CS, 1616CS, 16240,1632CS, 2032CS, 2424CS;
and' 436CS are designed in accordance with the requirements of the NFIP "Flood,insurance Manual",(2011) to prou)de automak
ecid lIzAtlon of hydr 6static flood forces by . allowing for the entry and exit of floodwaters, when properly Installed and sized as set
fort' below. This certification follows the design requirements and specifications established in FEMA Technical *Bulletin 1-08,
(1011 and the. ASCE
p nings In Foundation Walls and Walls of Enclosures Below Elevated Bdildings In Special Flood Hazard Areas",
Sta 1 and for "Flood Resistant Design and Construction" (ASCE/SEI 24-0$). The actual vent opening measurements were determined
aWbey"
acid c6ttift-d by Vr.t-hil -.VI.r$1ftia--M No. "02-90DO. "CilcUlallans. are basOd
fine lew of certification of Engineered Flood Openings, dated January 16, 2012" prepared by Dr., Georg Reichard, Associate Professor.
B? of 1 ilding Construction, Virginia Tech.
Delgii Characteristics
Sec on 2.6.i2 of ASCE 24 provides an equation to determine the required net area ofengineered openings (A,)for a given enclosed
are6 (A.). This equation Is btsed on the hydraulic formula for the flow rate across sharp edged orifices. I have utilized this equation
to 4�lculate 1) the respected flow rate through the Individual openings between louvers; 2) the flow rate through the main frame
opd'ingincase the iou"ver is blown out -during-a food dow rate ofwatpr IN
hyc aulic.short tube theory; The ultimate maximum total enclosed area (k) that can be -serviced by a single vent has then been
dot rmined by utilizing the lowest.flow rate of the three assessed scenarios for each vent and is listed in Table le,
ThE le values are based on the following assumptions:
In absence of reliable data, the rates of rise and fall have been
assumed with 5 feet/hour;
0 The (maximum) difference between the exterior and Interior
floodWAtqrjevels '.has .been assumed with I foot during base
A factor of safety of 5 has been assumed, which is consistent
wiffi d6trgn prgdkes: protp_cE1qn._oHff&- and.. propeety;
The net. area of openings (A.) as . provided by I the manufacturer.
Model
HxW
I . in]
A.
_Yn'l
A.
if?) -
0
816cs
9 x 16
106
205
0
1220CS
12 x 20
237.
Soo
,6
A"
❑
1616CS
16 x 16
184
395
1&24C-S,
312
-.835
1632CS
16 x 32
469-
2 0 2CS -
20x32
630
j 1240
2424CS
'24 x �24'
1230
certsficatiorti will _'be voided. If the following Installation. 24 x 3�
t uIreme;nts and limitations are not enforced. Table I Maximum total enclosed(Aj that can be
There shall be ainihimurn of two. openings on different sides of-) served-- by each individual model based on the
eabh e�&s :*eaj gIven*nei'are of engineered openingi(A.).
The bottom of each required openingshell be no more than Ift
a
abovefhe . adjacein't ground fevet;
No temporary (e-.g. - during cold wegthet) or permanent solid cover may be placed into or over the flood vent that would block
the automatic entry or exit of floodwaters at any time;
Where analysis Indicates rates of rise and fall greater than 5 E
ncloireda ble I shall be reduced
accordingly to accountfor the higher rates of rise and fall.Hitto-
Name Time
A. 'qqci; Presidlenti Gecl & Associates
Address - iiSO N 12P Avenue, Pensacola, FL 32563
Inc. .
lob
License FLpddaArofessionaiEngineertLj Vie6.33658
Signature
40
�Ijj IM @4 _4
Te flood vent models marked In Table il'are being Installed at the following building:
No. 55