section 19. flooding - maine...q3 flood data files contain certain key features (e.g., areas...

NUMBER NINE WIND FARM

MDEP NRPA/SITE LOCATION OF DEVELOPMENT COMBINED APPLICATION

Section 19.

Flooding

1

SECTION 19.

FLOODING

POTENTIAL FLOODING IMPACT 19.1

The Number Nine Wind Farm (Project) includes 8 areas that intersect with areas mapped as

either a Federal Emergency Management Agency (FEMA) floodplain or Special Flood Hazard

Area (SFHA). The Project includes 6 areas that intersect with Flood Prone Area Protection

Subdistricts mapped by the Land Use Planning Commission (LUPC). No improvements to access

roads or other permanent features will be located within mapped FEMA floodplains or SFHAs.

As described in detail below, electrical poles are the only permanent structures to be

constructed within mapped floodplains. These structures have very small footprints and will not

consume flood storage capacity. Therefore, the Project is not expected to cause or increase

flooding, or cause a flood hazard to any existing structure. Furthermore, these structures will not

have an unreasonable effect on runoff infiltration relationships in accordance with the “No

Adverse Effect Standard” of the Site Location of Development Law.

Forest cover in some floodplain areas will be cleared along the Project, resulting in some

conversion of forested areas to scrub-shrub or early successional cover, as discussed in Section

10 , Buffers, and Exhibit 10-A. Generally, this conversion to dense shrub and grass growth will

improve the ability of the land to absorb runoff due to the increased density of the root mass

associated with the resultant vegetative cover.

As discussed in Section 12, Stormwater Management, construction of the Project will not change

the hydrology in the vicinity of the Project. The surface area to be occupied by the new

structures is inconsequential and thus, there will not be an unreasonable effect on runoff

infiltration relationships. The Project will be designed, constructed, and maintained such that the

flooding extent and frequency of flooding of downstream waterbodies will not be increased

and the 100-year flood elevations will not be adversely affected.

19.1.1 Flood Mapping Sources

Two mapping sources were reviewed for the Project, including Q3 Flood Data developed by

FEMA and Land Use Planning Commission zoning maps.

Q3 Flood Data are developed by FEMA by scanning the existing hardcopy Federal Insurance

Rate Maps (FIRMs), published by FEMA at a scale of 1:24000, and vectorizing a thematic overlay

of flood risks. Q3 Flood Data files contain certain key features (e.g., areas inundated by 100-year



Section 19.

Flooding

2

flooding for which base flood elevations have been determined) from the existing hard copy

FIRMs.

Within LUPC jurisdiction, zoning maps identify Flood Prone Zones as LUPC Flood Prone Area

Protection Subdistricts.

Exhibits 19-1 thru 19-3 provide overlays of the Turbine Area with available Q3 Flood Data and

LUPC Flood Prone Zones to illustrate where the Project crosses mapped flood zone areas. There

are no Q3 Flood Zones within the Turbine Area.

TURBINE AREA 19.2

The Turbine Area does not intersect any areas mapped by FEMA. The Turbine Area includes 4

areas that intersect an LUPC Flood Prone Area Protection Subdistrict.

In T10 R3, 170 feet of an existing road will be improved within portions of the flood prone area

associated with Burnt Land Brook (Figure 19-1A).

In TD R2, the overhead electrical collection line will cross a flood prone area associated with

Number Nine Stream. The line is located adjacent to an existing road which will not be

improved; two poles will be located within the flood prone area (Figure 19-1B).

In T9 R3, the overhead electrical collection line will cross a flood prone area associated with

Hovey Brook. The line is located adjacent to an existing road which will be improved up to to 24

feet. Four poles and 390 feet of the improved road will be located within the flood prone area

(Figure 19-1C).

In T8 R3, the overhead electrical collection line will cross a flood prone area associated with the

East Branch of Howe Brook. The line is located adjacent to an existing road which will not be

improved; four poles will be located within the flood prone area (Figure 19-1D).

NORTH GENERATOR LEAD 19.3

The North Generator Lead intersects 1 LUPC Flood Prone Area Protection Subdistrict.

In T8 R3, an access road to the North Generator Lead will cross 256 feet of a flood prone area

associated with the North Branch of the Meduxnekeag River (Figure 19-2A).

The North Generator Lead includes 1 area that intersects with areas mapped by FEMA.



Section 19.

Flooding

3

In Houlton, the Generator Lead crosses 1 area associated with B Stream that is mapped as Zone

A1 and Zone X2 by FEMA. This area, located directly north of Ludlow Road includes one pole

within this zone (Exhibit 19-2B).

BRIDAL PATH GENERATOR LEAD 19.4

The Bridal Path Generator Lead includes 7 areas that intersect with areas mapped by FEMA.

In Houlton, the Generator Lead crosses 1 area associated with B Stream that is mapped as Zone

A and Zone X by FEMA. This area, located directly south of Ludlow Road, includes one pole

within this zone (Exhibit 19-3A).

In Houlton, the Generator Lead crosses 1 area associated with the Meduxnekeag River that is

mapped as Zone A and Zone X by FEMA. This area, located west of Porter Settlement Road,

does not include any poles or other permanent structures within this zone (Exhibit 19-3B).

In Hodgdon, the Generator Lead crosses 1 area associated with Oliver Brook that is mapped as

Zone A by FEMA. This area, located west of Bangor Street, includes 1 pole within this zone (Exhibit

19-3C).

In Linneus, the Generator Lead crosses 1 area, associated with an unnamed stream that flows

into Beaver Brook Lake, that is mapped as Zone A by FEMA. This area, located west of Bangor

Street, includes 1 pole within this zone (Exhibit 19-3D).

In Haynesville, the Generator Lead crosses 3 areas that are mapped as Zone A by FEMA. The first

area, near the northern border of Haynesville, includes 2 poles within this zone (Exhibit 19-3F).

The second area, associated with the West Branch of the Mattawamkeag River, includes 1 pole

within this zone (Exhibit 19-3G). The third area, associated with Alder Brook, includes 2 poles

within this zone (Exhibit 19-3H).

The Bridal Path Generator Lead includes 1 area that interects an LUPC Flood Prone Area

Protection Subdistrict.

In Forkstown Township, the Line intersects a flood prone area associated with the East Branch of

the Mattawamkeag River. No poles will be located within this area (Figure 19-3E).

1 FEMA Zone A: Areas with a 1% annual chance of flooding and a 26% chance of flooding over the life of a

30-year mortgage. Because detailed analyses are not performed for such areas; no depths or base flood

elevations are shown within these zones. FEMA Zone C is the equivalent of Zone X (unshaded) on new and

revised FEMA maps. 2 FEMA Zone X: Area of moderate flood hazard, usually the area between the limits of the 100-year and

500-year floods. Area also used to designate base floodplains of lesser hazards, such as areas protected by

levees from 100-year flood, or shallow flooding areas with average depths of less than one foot or drainage

areas less than 1 square mile.



Section 19.

Flooding

TURBINE AREA FLOOD MAPS EXHIBIT 19-A

Burnt Land BrookPresque Isle Stream

Presque IsleStr eam

0 500Feet

Disclaimer: Stantec assumes no responsibility for data supplied in electronic format. The recipient accepts full responsibility for verifying the accuracy and completeness of the data. The recipient releases Stantec, its officers, employees, consultants and agents, from any and all claims arising inany way from the content or provision of the data.

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WELSTD R2WELS

T8 R3WELS

TC R2WELS

DudleyTwp

Hammond

PresqueIsle Easton

Chapman

SaintCroixTwp

19-1B

19-1C

19-1D

19-1A

0 2.5Miles

30 Park DriveTopsham, ME USA 04086Phone (207) 729-1199

00919_Flooding_TurbineArea.mxd

Client/Project

Title

EDP Renewables North America LLCNumber Nine Wind FarmAroostook County, Maine

Turbine AreaFlood Prone Areas3/27/2015

19-1AFigure No.

Prepared by EMK on 2015-02-26Reviewed by JYP on 2015-03-26

LegendAccess Road Edge of Gravel (20150317)LUPC Flood Prone Area Protection SubdistrictLimit of Disturbance (20150226)

(At page size of 8.5"x11")1 inch = 500 feet

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Aerial Photography: ESRI World Imagery Web Mapping Service (June 2011).Notes:1. LUPC Flood Prone Area Protection Subdistrict data provided by MaineOffice of GIS (MEGIS).2. FEMA 100 Year Flood Zones digitized from the Maine Flood InsuranceRate Maps obtained from the FEMA Map Service Center and should beconsidered approximate.

Turbine Area

Number Nine Stream

0 500Feet


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Chapman

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19-1A

19-1C

19-1D

19-1B

0 2.5Miles



Client/Project

Title



19-1BFigure No.


LegendTurbines (20150316)Collector Poles (20150316)Overhead Collector (20150316)

Access Road Edge of Gravel (20150317)LUPC Flood Prone Area Protection SubdistrictLimit of Disturbance (20150226)


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Hovey Brook

0 500Feet


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TC R2WELS

DudleyTwp

Hammond

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Chapman

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19-1B

19-1A

19-1D

19-1C

0 2.5Miles



Client/Project

Title



19-1CFigure No.





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East Branch Howe Brook

0 500Feet


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19-1B

19-1A

19-1C

19-1D

0 2.5Miles



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Title



19-1DFigure No.





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Turbine Area



Section 19.

Flooding

NORTH GENERATOR LEAD FLOOD MAPS EXHIBIT 19-B

415

414

413

412

411 0 500Feet


195600919

($$¯Bridgewater

T9 R3WELS

TD R2WELS

Smyrna Ludlow

Houlton

NewLimerick

HodgdonLinneus

T8 R3WELS

MonticelloTC R2WELS

DudleyTwp

LittletonHammond

Oakfield

19-2B

19-2A

0 2Miles


00919_Flooding_NorthGeneratorLead.mxd

Client/Project

Title


Figure No.


LegendGenerator Lead Poles (20150320)North Generator Lead (20150316)Access Road Edge of Gravel (20150317)LUPC Flood Prone Area ProtectionSubdistrictLimit of Disturbance (20150226)


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North Generator LeadFlood Prone Areas3/27/2015

19-2A


Northern Generator Lead

214

213

212

211

210

209

B Stream

B Stream

0 500Feet


195600919

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T9 R3WELS

TD R2WELS

Smyrna Ludlow

Houlton

NewLimerick

HodgdonLinneus

T8 R3WELS

MonticelloTC R2WELS

DudleyTwp

LittletonHammond

Oakfield

19-2A

19-2B

0 2Miles


00919_Flooding_NorthGeneratorLead.mxd

Client/Project

Title


Figure No.


LegendGenerator Lead Poles (20150320)North Generator Lead (20150316)Bridal Path (20150316)FEMA 100 Year Flood Zone (Digitzed)Limit of Disturbance (20150226)


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North Generator LeadFlood Prone Areas3/27/2015

19-2B


Northern Generator Lead



Section 19.

Flooding

BRIDAL PATH GENERATOR LEAD FLOOD MAPS EXHIBIT 19-C

214

213

212

211210

209

B Stream

B Stream

0 500Feet


195600919

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HaynesvilleGlenwoodPlt

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TA R2WELS

ForkstownTwp

19-3B19-3C

19-3D

19-3E19-3F

19-3G

19-3H

19-3A

0 2Miles


00919_Flooding_BridalPathGeneratorLead.mxd

Client/Project

Title


Figure No.


LegendGenerator Lead Poles (20150320)North Generator Lead (20150316)Bridal Path (20150316)FEMA 100 Year Flood Zone (Digitzed)Limit of Disturbance (20150226)


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Bridal PathFlood Prone Areas3/27/2015

19-3A


Bridal Path

188

187

186

185

184

Moose Brook

Medu

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Meduxnekeag River0 500Feet


195600919

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Hodgdon

Linneus

Oakfield


Orient

TA R2WELS

ForkstownTwp

19-3A

19-3C

19-3D

19-3E19-3F

19-3G

19-3H

19-3B

0 2Miles



Client/Project

Title


Figure No.


LegendGenerator Lead Poles (20150320)Bridal Path (20150316)FEMA 100 Year Flood Zone (Digitzed)Limit of Disturbance (20150226)


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19-3B


Bridal Path

Oliver Brook

178

177

176

175174

173

172

0 500Feet


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Hodgdon

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TA R2WELS

ForkstownTwp

19-3A

19-3B

19-3D

19-3E19-3F

19-3G

19-3H

19-3C

0 2Miles



Client/Project

Title


Figure No.




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19-3C


Bridal Path

118

117

116

115

114

Coffin Brook

0 500Feet


195600919

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SmyrnaLudlow

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Hodgdon

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Oakfield


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TA R2WELS

ForkstownTwp

19-3A

19-3B19-3C

19-3E19-3F

19-3G

19-3H

19-3D

0 2Miles



Client/Project

Title


Figure No.




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19-3D


Bridal Path

38

37

36

35

34

33

East BranchMattawamkeag River

0 500Feet


195600919

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ForkstownTwp

19-3A

19-3B19-3C

19-3D

19-3F

19-3G

19-3H

19-3E

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Figure No.


LegendGenerator Lead Poles (20150320)Bridal Path (20150316)LUPC Flood Prone Area Protection SubdistrictLimit of Disturbance (20150226)


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19-3E


Bridal Path

31

30

29

280 500

FeetDisclaimer: Stantec assumes no responsibility for data supplied in electronic format. The recipient accepts full responsibility for verifying the accuracy and completeness of the data. The recipient releases Stantec, its officers, employees, consultants and agents, from any and all claims arising inany way from the content or provision of the data.

195600919

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T4 R3WELS

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T3 R3WELS

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Hodgdon

Linneus

Oakfield


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TA R2WELS

ForkstownTwp

19-3A

19-3B19-3C

19-3D

19-3E

19-3G

19-3H

19-3F

0 2Miles



Client/Project

Title


Figure No.


LegendGenerator Lead Poles (20150320)Bridal Path (20150316)LUPC Flood Prone Area Protection SubdistrictFEMA 100 Year Flood Zone (Digitzed)Limit of Disturbance (20150226)


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19-3F


Bridal Path

21

20

19

18

West Branch Mattawamkeag River

0 500Feet


195600919

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Cary Plt

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T3 R3WELS

SmyrnaLudlow

HoultonNewLimerick

Hodgdon

Linneus

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TA R2WELS

ForkstownTwp

19-3A

19-3B19-3C

19-3D

19-3E19-3F

19-3H

19-3G

0 2Miles



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Figure No.




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19-3G


Bridal Path

Alder Brook6

5

4

3

2ZZZ-4

SWITCH1

0 500Feet


195600919

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Cary Plt

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T3 R3WELS

SmyrnaLudlow

HoultonNewLimerick

Hodgdon

Linneus

Oakfield


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TA R2WELS

ForkstownTwp

19-3A

19-3B19-3C

19-3D

19-3E19-3F

19-3G

19-3H 0 2Miles



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Figure No.




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19-3H


Bridal Path

section 19. flooding - maine...q3 flood data files contain certain key features (e.g., areas...

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