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CULPEPPER & TERPENING, INC
CONSULTING ENGINEERS I LAND SURVEYORS
NO RISE ANALYSIS REPORT FOR
6418 RIVE RLAN D DRIVE
C&T Project No. 18-034
MAY 16, 2018
•
PREPARED BY
Culpepper& Terpening, Inc
2980 South 25th Street
Y
Fort Pierce, Florida 34981
Tel. (772) 464-3537
www.ct-eng.com
PREPARED FOR
Mr. Mark Powers
6418 Riverland Drive
Fort Pierce, Florida 34982
1. Section 1— General Information
1.1. Project Description
The firm of Culpepper & Terpening, Inc. has been retained by the Owner to perform an analysis of
the impact on the St. Lucie River Floodway by the proposed redevelopment of an existing 0.34-acre
residential property, on lot 6 of the Riverland Subdivision, located at 6418 Riverland Dr., located in
the unincorporated area of St. Lucie County, Florida. The project is located along an oxbow of the
St. Lucie River, approximately 600 feet east of the main channel of the North Fork of the St. Lucie
River. A general Project Location Map, "Figure 1" is included on page 3.
As per the St. Lucie County Property Appraiser's Property Information Card, the site was originally
developed as a single-family residence in 1981; the property contained a freestanding single-family
residence with an attached garage, and boat dock.
Hurricane Irma damaged the existing homestead in September 2017 and the Owner has prepared
plans for the construction of a new homestead and is under plan review by St. Lucie County.
1.2. Purpose
The purpose of the following analysis is to determine there is a "NO -RISE" impact on the St. Lucie
River Floodway by the redevelopment. Since the project redevelopment of 6418 Riverland Dr.
activities lies within the designated St. Lucie River Floodway, as depicted in Exhibit C — "FEMA
Flood Map", thus an "NO -RISE" analysis will be required in compliance with FEMA Regulation 44
CFT 60.3(d).
1.3. Project Background
1.3.1.Historic Aerial Photographs
We have attached "Exhibit A — Historical Aerial" on page 10, which depicts site conditions as of
2016. The aerial depicts the existing homestead and attached garage, and a boat dock, located at
6418 Riverland Dr. St. Lucie County, Florida prior to the commencement of construction.
1.3.2. Boundary and Topographic Survey
We have attached portions of the site Survey performed by this office, on April 11, 2018 as Exhibit
B — "Survey Excerpt", see on page 11.
No Rise Analysis Report Page 2 of 14 May 11, 2018
Prepared By: Culpepper & Terpening, Inc. C&T Project No. 18-034
6418 Riverland Dr.
St. Lucie County, Florida
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SECTION 9, TOWNSHIP 36 SOUTH, RANGE 40 EAST
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Figure 1. Location Map.
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No Rise Analysis Report Page 3 of 14 May 11, 2018
Prepared By: Culpepper & Terpening, Inc. C&T Project No. 18-034
1.3.3. FEMA Map
We have attached "Exhibit C - FEMA Flood Map," on page 12 taken from FEMA Map No.
12111CO276J, Dated 02/16/12, which depicts the floodway designation and a base flood elevation
of 6.3 NAVD at the location of this property.
1.3.4. Existing Structures
The existing site development, based on field surveys and review of the St. Lucie County Property
Appraiser Card, contains a total of 3,340 square feet (sf of structures. The structure includes; one
(1) single story family residence, one (1) single story attached garage, one (1) covered screened Lanai
attached, two (2) attached concrete patios, and one (1) attached covered concrete patio.
The existing site development is depicted on the attached "Exhibit D —Pre Development" on page
13. A summary of these structures is shown on "Table 1 — Existing Structures" below:
Table 1
Existing Structures
Single-family Residence
2,059
SF
Attached Garage
525
SF
Concrete Patios
266
SF
Lanai
490
SF
TOTAL
3,340
SF
1.3.5. Proposed Structures
The property will remain as single-family residence with accessory structures after construction as
shown in the attached "Exhibit E — Post Development" on page 14. The redeveloped site based on
the building permit, includes the following:
• Demolition of the existing 2,059 sf residential structure and 525 sf attached garage;
• Demolition of the existing patios and lanai; and
• Construction of a 1,751 sf single-family residence and 1,195 sf associated structures.
No Rise Analysis Report Page 4 of 14 May 11, 2018
Prepared By: Culpepper & Terpening, Inc. C&T Project No. 18-034
A summary of these structures is shown on "Table 2 — Proposed Structures"below:
Table 2
Proposed Structures
Single-family Residence
1,751 SF
Covered Concrete Porch
596 SF
Concrete Equipment Pad
132 SF
TOTAL
2,946 SF.
2. Section 2 — No -Rise Analysis
2.1. No — Rise Analysis Methodology
The definition of "NO — RISE" will be determined based on the requirements, as follows:
• The post development "Floodway Impedance" is less than or equal to the pre development
floodway impedance; and
• The post development "Flood Plain Storage" is equal to or greater than the pre
development.
The "Floodway Impedance" is defined as the calculated area in square feet (sf of the structure as
measured perpendicular direction to the stream flow.
The first component of Floodway Impedance is the "vertical impedance" of each structure. The
vertical impedance is defined as the difference between natural grade and the Floodway Elevation
measured in feet.
The second component of Floodway Impedance is the "horizontal impedance" of each structure.
The horizontal impedance is defined as the horizontal measurement of structure as measured
perpendicular to the stream flow.
In accordance with FEN 1_A analysis, if a structure is in the shadow of another structure upstream,
then the downstream structure doesn't add additional impact to the Floodway.
The "Floodway Impedance" for each structure was calculated in square feet (sf by multiplying the
vertical impedance by the horizontal impedance.
No Rise Analysis Report Page 5 of 14 May 11, 2018
Prepared By: Culpepper& Terpening, Inc. C&T Project No. 18-034
Floodplain storage will be analyzed as a volumetric measurement of the site storage from existing
ground to the finish floor of the structures.
2.1.1. Pre -Development Floodway Impedance
The pre -development impedance was determined for each existing structure by multiplying the
vertical impedance by the horizontal impedance. A review of the site survey and the St. Lucie
County Property ser Card sows that fhe exisaug residence is a three a oom sing e-
family home.
The vertical impedance natural grade elevation for each structure was determined by reviewing the
topographic survey and interpolating surveyed ground elevation sho.ts surrounding each structure.
Structures that do not exceed the Floodplam— Elevation of 6.3 NAVD, such as the driveway, Lanai
and patios, the vertical impedance was measured from the natural grade to the top of the structure.
The horizontal impedance of each structure was measured perpendicular to the direction of
Floodway flow. The site is located along an oxbow of the St. Lucie River, approximately 600 feet
west of the main channel. The perpendicular direction of the Floodway flow is measured in relation
to the main channel of the St. Lucie River.
The "Pre -Development Impedance" has been calculated as 224.59 square feet as shown below in
Table 3.
Table 3
Pre -Development Impedance
Ftmshed.
r `> � �
Natural
Yerttcal
'�HonzQatal
" Floodway- r
Elevation
Floodway
Grade
-Impedance
Impezdafice
Impedance
.�
f
AVD
r
AVD
ft '
ff
Area SFi
Structure;_
A?D
Residence
5.60
6.3
3.44
2.86
70.47
201.55
Concrete Patio
4.64
6.3
3.44
1.20
2.54
3.05
Driveway Curb
4.76
6.3
3.44
1.32
15.14
19.99
TOTAL
224.59
*Exhibit D-Pre Development
2.2.Proposed Development Floodway Impedance
As per the Architectural Plans by Scott Archer Studio, dated March 28, 2018, the proposed
residence is a three (3) bedroom single-family home.
No Rise Analysis Report Page 6 of 14 May 11, 2018
Prepared By: Culpepper & Terpening, Inc. C&T Project No. 18-034
The proposed development impedance was determined for each structure by multiplying the vertical
impedance by the horizontal impedance.
The vertical impedance natural grade elevation for each structure was determined by reviewing the
topographic survey and interpolating surveyed ground elevation shots surrounding each structure.
Structures that do not exceed the Floodplain Elevation of 6.3 NAVD, such as the driveway, the
vemca unpe ante were measured from ffie natural grade to the top ot the structure.
The horizontal impedance of each structure was measured perpendicular to the direction of stream
flow. Since there was no increase in the number of bedrooms in the proposed redevelopment plan,
it was determined that there would be no additional impacts to the septic drainfield size. A septic
drainfiled size is dependent on the capacity of the system as determined by the amount of bedrooms
in the residence and thus a drainfield analysis was excluded.
The Post Development Floodway Impedance for the Project has been calculated as 224.55 square
feet, as shown below in Table 4, "Post Development Impedance."
In analyzing the post development Floodplain Storage, we determined that the development area
reduced by approximate 394 square feet and the onsite storage volume increased by approximately
1,127 cubic feet. Thus, there is no significant change in the available flood plain storage for the post
development condition.
Table 4
Post-Develo
ment Impedance
Ftmshed
u `
I�I,atural
Veit�cal '
Y'�I�oFnzontal
I�}gedance
�, N
Elevation �
*
Floodway
Gradef; r�
Impedance
)Empedance
`Area` '�
Y
t
SEA''
...Structure
AVD
AYD .,
ADD:
ft
Residence
8.00
1 6.3
1 3.44
2.86
65.44
187.16
Drivewa
4.79
6.3
3.44
1.35
12.80 -
17.28
Concrete Porch
7.30
6.3
3.44
2.86
7.03
20.11
TOTAL
224.55
*Exhibit E — Post Development
(This space is intentionally left blank.)
No Rise Analysis Report Page 7 of 14 T1ay 11, 2018
Prepared By: Culpepper & Terpening, Inc. C&T Project No. 18-034
Conclusion
Based ,on the analysis conducted by Culpepper & Terpening, Inc., and with the reliance of
information, plans and surveys, the following findings are made:
1. Culpepper & Terpening, Inc. was retained by our Client to analyze the impacts of the
proposed redevelopment of a residential property;
2. The site is located in the unincorporated area of St. Lucie County Florida, on the North
.,
3. The site, Lot 6 of the Riverland Subdivision, contains 0.34 acre of residential zoned
property;
4. The original homestead per St. Lucie County Property Appraiser office was constructed in
1981;
5. The properly is located with a floodway designation per FEMA Map No. 12111CO276J,
Dated 02/16/12;
6. The base flood elevation is 6.3 NAVD per FEMA Map No. 12111CO276J, Dated 02/16/12;
7. An analysis was completed in compliance with FEMA Regulation 44 CFT 60.3(d);
8. The pre -development impedance was calculated to be 224.59 sf;
9. The proposed development impedance was calculated to be 224.55 sf;
10. The proposed development impendence is 0.04 sf less than the pre -development
impendence; and
11. A "No Rise" in the floodplain is anticipated because of the redevelopment.
No Rise Analysis Report Page 8 of 14 May 11, 2018
Prepared By: Culpepper & Terpening, Inc. C&T Project No. 18-034
Certification
Our office has reviewed and considered the historic development of the property, existing site
conditions, the proposed Site Plan, surveys and building plans'in performing our of the impacts of
the proposed redevelopment.
It is our opinion that based on our analysis and the removal of the existing structures that the post
development encroac ens w—M be tess Man or equal o Tie pre-Elevelopin—ent encroactiments an
thus will result in a "NO=RISE" to the North Fork of the St. Lucie River Floodway.
Prepared By:
CULPEPPER & TERPENING, INC.
James P/'Bu/ch" Terpening, Jr., P.E.
FL Re st lion # 24276
Date: 5 / 141 11
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No Rise Analysis Report Page 9 of 14 May 11, 2018
Prepared By: Culpepper & Terpening, Inc. C&T Project No. 18-034
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Exhibit - Historic Aerial (2016)
CULPEPPER & TERPENING, INC
CONSULTING ENGINEERS I LAND SURVEYORS
2980 SOUTH 25th STREET • FORT PIERCE, FLORIDA 34981
PHONE 772464-3537 • FAX 772464-9497 • w ..ct-mg wm
151 SW FLAGLER AVENUE • ST'UART, FLORIDA 34994
PHONE 772-220-3376 • FAX 772464-9497 • a .ct- &com
STATE OFFLOMDA CENTMCA770NNa L9 4M
NO RISE Analysis
6418 Riverland Dr.
HISTORIC AERIAL
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DATE O4-24-1e
No Rise Analysis Report Page 10 of 14 May 11, 2018
Prepared By: Culpepper & Terpening, Inc. C&T Project No. 18-034
S41Vf LUClF. RLVFR
APPROXIMATE MEAN HIGH WATER LINE
AT ELEVA710N -0.14'
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INTERPOLATION STATION N0. 926
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Note: Taken from Culpepper & Terpening, Inc.
Survey dated April 11, 2018
Exhibit B - Survey Excerpt
CULPEPPER St TERPENING, INC
9J' CONSULTING ENGINEERS I .LAND SURVEYORS
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, 2980 SOUTH 25th STREET • FORT PIERCE, FLORIDA 34981
PHONE 772464-3537 • FAX 772-464-9497 • www.ct-eng.com
SI AI'G OF FLUh1llA CGF'1'1F1CX171ON No. LB 1286
No Rise Analysis Report Page 11 of 14
Prepared By: Culpepper & Terpening, Inc.
NO -RISE Analysis
6418 Riverland Dr.
Survey Excerpt
JD8 NO: 18-ON
SCALE: 1:30
FILE' 10-034 S bXLan
DATE 04-24-18
May 11, 2018
C&T Project No. 18-034
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Exhibit C - FEMA Flood Map
CULPEPPER & TERPENING, INC
CONSULTING ENGINEERS I LAND SURVEYORS
} 2980 SOUTH 25th STREET • FORT PIERCE, FLORIDA 34981
PHONE 772�64 3537 •PAX 772-464 9497 • wwcv ct en com
&
52'ATS OPFZORIDA CIILTIPICATTONNa LB 428TS
No Rise Analysis Report Page 12 of 14
Prepared By: Culpepper & Terpening, Inc.
• ` -
PANEL Oi/8J 1
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FLOOD INSURANCE RATE MAP j
ST. LUCIE COUNTY;
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FLORIDA '
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MAP REVISED
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NO RISE Analysis
6418 Riverland Dr.
FEMA Flood Map
JOB NIX to —am
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T'vIay 11, 2018
C&T Project No. 18-034
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(OXBOW) $
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7 RESIDENCE
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DRIVEWAY
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Exhibit D - Pre Development
CULPEPPER be TERPENING, INC
CONSULTING ENGINEERS LAND SURVEYORS
2980 SOUTH 25Lh STREET • FORT PIERCE, FLORIDA 34981
as PHONE 772-4643537 •FAX 772464-9497 • www.a-eagcom
%•°:�51'dTE OF FLOIiIU:\ C6R'1'IFIC.I"C1QN No. LB 1296
No Rise Analysis Report Page 13 of 14
Prepared By: Culpepper & Terpening, Inc.
EXIST.
FENCE
_
NO -RISE Analysis
6418 Riverland Dr.
PRE DEVELOPMENT
JQB NLA 18-G1#
SCALE• I.,M
RLE 18-a% Edibaft
DAM 04-23-12018
May 11, 2018
C&T Project No. 18-034
ff. LUCIE RIVER 3 3
(OXBOW) $
0
WAMM
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Kw 31,04'(p)
1
PROP. CONC
EQUIPMENTPAD 41�$ ��, PROP. COVERED
CONC. PORCH
PROPOSED
TWO STORY
r RESIDENCE
Ala
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PROP:
4r�) • ; CONC.
DRIVEWAY
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Exhibit E - Post Development
CULPEPPER & TERPENING, INC
uQ
CONSULTING ENGINEERS I LAND SURVEYORS
53q 2980 SOUTH 25th STREET • FORT PIERCE, FLORIDA 34981
t� PHONE 772-4643537 • FAX 772-464-9497 www.ct-.cmg.com
S'rAXE OF FLORIDA CEWrIFIC.MON No. LB -12 6
No Rise Analysis Report Page 14 of 14
Prepared By: Culpepper & Terpening, Inc.
NO RISE Analysis
6418 Riverland Dr.
PROPOSED DEVELOPMENT
JCS Ne is -Olaf
I =ME- 1:30
FIIE 16-034 Womft
I AAW- at23-mir
May 11, 2018
C&T Project No. 18-034