HomeMy WebLinkAbout20080820 Ver 2_401 Application_20100910
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September 17, 2010
Ms. Cyndi Karoly
NC DENR
Division of Water Quality, Wetlands Unit
1650 Mail Service Center
Raleigh, North Carolina 27699-1650
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Subject: Pre-Construction Notification Pursuant to Nationwide Permit No. 27
and Water Quality Certification No. 3689
Faust Site Stream Enhancement Project (DWQ# 08-0820)
Cabarrus County, North Carolina
Dear Ms. Karoly:
Please find enclosed five copies of our PCN re-submittal package for the subject project. The
previously submitted permit application (DWQ #08-0820) has expired prior to commencement of
ground work activities. Additionally, the proposed enhancement activities have been revised to
include an additional 47 linear feet of downstream channel work. We have included the following
revised supporting data:
• PCN form,
• USGS Topographic and Aerial Maps,
• Existing Conditions and Design Summary Memo,
• Photo Log,
• 60% design plans for the enhancement project.
The goal of this project is to improve and restore the hydrological, morphological, and biological
functions of a degraded stream corridor through the use of natural channel design methods.
This same information has been submitted to the Asheville Regulatory Field Office of the US Army
Corps of Engineers. If you have any questions, please call me at (704) 332-7754.
Sincerely,
Ma enkins, PWS
Environmental Scientist
Enclosure
cc: Mr. Steve Chapin
US Army Corps of Engineers
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Office Use Only:
Corps action ID no.
DWQ project no.
Form Version 1.3 Dec 10 2008
Pre-Construction Notification (PCN) Form
A. Applicant Information
1. Processing
1a. Type(s) of approval sought from the
Corps:
®Section 404 Permit El Section 10 Permit
1b. Specify Nationwide Permit (NWP) number: No. 27 or General Permit (GP) number:
1c. Has the NWP or GP number been verified by the Corps? ? Yes ® No
1d. Type(s) of approval sought from the DWQ (check all that apply):
® 401 Water Quality Certification - Regular ? Non-404 Jurisdictional General Permit
? 401 Water Quality Certification - Express ? Riparian Buffer Authorization
1e. Is this notification solely for the record
because written approval is not required? For the record only for DWQ 401
Certification:
? Yes ® No For the record only for Corps Permit:
? Yes ® No
1f. Is payment into a mitigation bank or in-lieu fee program proposed for mitigation
of impacts? If so, attach the acceptance letter from mitigation bank or in-lieu
fee program. ? Yes ® No
1 g. Is the project located in any of NC's twenty coastal counties. If yes, answer 1 h
below. ? Yes ® No
1 h. Is the project located within a NC DCM Area of Environmental Concern (AEC)? ? Yes ® No
2. Project Information
2a. Name of project: Faust Site Stream Enhancement
2b. County: Cabarrus
2c. Nearest municipality / town: Concord
2d. Subdivision name: Carriage Downs, Lots #282 and #283
2e. NCDOT only, T.I.P. or state
project no:
3. Owner Information
3a. Name(s) on Recorded Deed: Pete & Ellen Faust - Tax: 46908425700000
Joseph & Marci Mattes - Tax: 46908445430000
3b. Deed Book and Page No. Faust - 3898-254
Mattes - 1509-339
3c. Responsible Party (for LLC if
applicable):
3d. Street address: Faust - 1044 Lyerly Ridge Road NW
Mattes - 1037 Lyerly Ridge Road NW
3e. City, state, zip: Concord, NC 28027
3f. Telephone no.: Pete Faust - 804-366-5513
3g. Fax no.:
3h. Email address:
Page 1 of 11
PCN Form - Version 1.3 December 10, 2008 Version
4. Applicant Information (if different from owner)
4a. Applicant is: ? Agent ? Other, specify:
4b. Name:
4c. Business name
(if applicable):
4d. Street address:
4e. City, state, zip:
4f. Telephone no.:
4g. Fax no.:
4h. Email address:
5. Agent/Consultant Information (if applicable)
5a. Name: Andrea M. Spangler
5b. Business name
(if applicable): Wildlands Engineering, Inc.
5c. Street address: 1430 S. Mint Street, Suite 104
5d. City, state, zip: Charlotte, NC 28203
5e. Telephone no.: 704-332-7754
5f. Fax no.: 704-332-3306
5g. Email address: aspangler@wildiandsinc.com
Page 2of11
B. Project Information and Prior Project History
1. Property Identification
1a. Property identification no. (tax PIN or parcel ID): 46908425700000 (Faust) & 46908445430000 (Mattes)
1b. Site coordinates (in decimal degrees): Latitude: 35.398933 Longitude: 80.683992
(DD.DDDDDD) (-DD.DDDDDD)
1c. Property size: 1.57 acres (Faust) & 0.63 acre (Mattes)
2. Surface Waters
2a. Name of nearest body of water (stream, river, etc.) to Unnamed tributary to Coddle Creek
proposed project:
2b. Water Quality Classification of nearest receiving water: Class WS-11, HQW
2c. River basin: Yadkin 03040105
3. Project Description
3a. Describe the existing conditions on the site and the general land use in the vicinity of the project at the time of this
application:
The proposed stream enhancement site is located on a degraded and incised section of an unnamed tributary that flows
through a mostly residential area of the City of Concord. The project is approximately 391 feet in length and is located
entirely within the Faust and Mattes residential parcels. There are residential structures located on the left bank of the
project reach. There are no structures on the right bank. The land to the south of the project is currently cleared and a
residential development is being planned for the area.
3b. List the total estimated acreage of all existing wetlands on the property:
N/A
3c. List the total estimated linear feet of all existing streams (intermittent and perennial) on the property:
Approximately 391 linear feet of perennial channel within the project area.
3d. Explain the purpose of the proposed project:
The purpose of this work is to enhance approximately 391 linear feet of degraded and incised stream such that a stable
dimension and profile are achieved.
3e. Describe the overall project in detail, including the type of equipment to be used:
The proposed changes to the channel will reduce bank erosion, provide lateral diversity of stream depth and velocity, and
increase vertical diversity by creating stable functioning riffles, steps and pools. Various types of equipment will be used
including a track excavator, loader, dump truck, and hand labor. See attached plans for more detail.
4. Jurisdictional Determinations
4a. Have jurisdictional wetland or stream determinations by the
Corps or State been requested or obtained for this property /
project (including all prior phases) in the past?
®Yes ? No ? Unknown
Comments: Jurisdictional Determination was received along
with prior permit application (SAW-2008-1586) on June 9,
2008.
4b. If the Corps made the jurisdictional determination, what type
? Preliminary ®Final
of determination was made?
4c. If yes, who delineated the jurisdictional areas? Agency/Consultant Company: Wildlands Engineering,
Name (if known): Inc.
Other:
4d. If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach documentation.
Verification received with prior permit applications SAW-2008-1586 and DWQ# 08-0820, June 9, 2008 and May 23, 2008,
respectively.
Page 3 of 11
PCN Form - Version 1.3 December 10, 2008 Version
Project Information and Prior Project History
5. Project History
5a. Have permits or certifications been requested or obtained for
this project (including all prior phases) in the past? ® Yes ? No ? Unknown
5b. If yes, explain in detail according to "help file" instructions.
The previously received permit approvals have expired prior to commencement of groundwork activities. Permit approvals
include SAW-2008-1586, June 9, 2008 and DWQ#.08-0820, May 23, 2008.
6. Future Project Plans
6a. Is this a phased project? ? Yes ®No
6b. If yes, explain.
Page 4 of 11
C. Proposed Impacts Inventory
1. Impacts Summary
1a. Which sections were completed below for your project (check all that apply):
? Wetlands ® Streams - tributaries ? Buffers
? Open Waters ? Pond Construction
2. Wetland Impacts
If there are wetland impacts proposed on the site, then complete this question for each wetland area impacted.
2a. 2b. 2c. 2d. 2e. 2f.
Wetland impact Type of jurisdiction
number - Type of impact Type of wetland Forested (Corps - 404, 10 Area of impact
Permanent (P) or (if known) DWQ - non-404, other) (acres)
Temporary T
W1 ? P ? T ? Yes ? Corps
? No ? DWQ
W2 ? P ? T ? Yes ? Corps
? No ? DWQ
W2 ? P ? T ? Yes ? Corps
? No ? DWQ
W3 ? P ? T ? Yes ? Corps
? No ? DWQ
W4 ? P ? T ? Yes ? Corps
? No ? DWQ
W5 ? P ? T ? Yes ? Corps
? No ? DWQ
2g. Total wetland impacts
2h. Comments:
3. Stream Impacts
If there are perennial or intermittent stream impacts (including temporary impacts) proposed on the site, then complete this
question for all stream sites impacted.
3a. 3b. 3c. 3d. 3e. 3f. 3g.
Stream impact Type of impact Stream name Perennial Type of jurisdiction Average Impact
number - (PER) or (Corps - 404, 10 stream length
Permanent (P) or intermittent DWQ - non-404, width (linear
Temporary (T) (INT)? other) (feet) feet)
S1 ? P ® T Enhancement UT to Coddle
Creek ® PER
? INT ® Corps
® DWQ 10 391
S2 ? P ? T ? PER ? Corps
? INT ? DWQ
S2 ? P ? T ? PER ? Corps
? INT ? DWQ
S3 ? P ? T ? PER ? Corps
? INT ? DWQ
S4 ? P ? T ? PER ? Corps
? INT ? DWQ
3h. Total stream and tributary impacts 391
3i. Comments: All impacts to on-site streams include temporary enhancement activities to 391 linear feet of channel.
Page 5 of 11
PCN Form - Version 1.3 December 10, 2008 Version
4. Open Water Impacts
If there are proposed impacts to lakes, ponds, estuaries, tributaries, sounds, the Atlantic Ocean, or any other open water of
the U.S. then individual) list all open water impacts below.
4a. 4b. 4c. 4d. 4e.
Open water Name of waterbody
impact number - (if applicable) Type of impact Waterbody type Area of impact (acres)
Permanent (P) or
Temporary T
01 ?P?T
02 ?P?T
03 ?P?T
04 ?P?T
4f. Total open water impacts
4g. Comments:
5. Pond or Lake Construction
If and or lake construction proposed, then complete the chart below.
5a. 5b. 5c. 5d. 5e.
Wetland Impacts (acres) Stream Impacts (feet) Upland
Pond ID Proposed use or purpose (acres)
number of pond
Flooded Filled Excavated Flooded Filled Excavated Flooded
P1
P2
5f. Total
5g. Comments:
5h. Is a dam high hazard permit required?
? Yes ? No If yes, permit ID no:
5i. Expected pond surface area (acres):
5j. Size of pond watershed (acres):
5k. Method of construction:
6. Buffer Impacts (for DWQ)
If project will impact a protected riparian buffer, then complete the chart below. If yes, then individually list all buffer impacts
below. If an impacts require mitigation, then you MUST fill out Section D of this form.
6a.
? Neuse ? Tar-Pamlico ? Other:
Project is in which protected basin? ? Catawba ? Randleman
6b. 6c. 6d. 6e. 6f. 6g.
Buffer impact
number- Reason Buffer Zone 1 impact Zone 2 impact
Permanent (P) or for Stream name mitigation (square feet) (square feet)
Temporary T impact required?
B1 ?P?T ?Yes
? No
B2 ? P ? T ? Yes
? No
B3 ?P?T ?Yes
? No
6h. Total buffer impacts
6i. Comments:
Page 6 of 11
D. Impact Justification and Mitigation
1. Avoidance and Minimization
1a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing project.
The project constitutes a positive impact since it will enhance stream function and habitat by improving bed features in the
stream.
1b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques.
Construction practices will follow guidelines from the NC Erosion and Sediment Control Planning and Design Manual.
2. Compensatory Mitigation for Impacts to Waters of the U.S. or Waters of the State
2a. Does the project require Compensatory Mitigation for
impacts to Waters of the U.S. or Waters of the State? ? Yes ® No
2b. If yes, mitigation is required by (check all that apply): ? DWQ ? Corps
2c. If yes, which mitigation option will be used for this
pro
project? ? Mitigation bank
El Payment to in-lieu fee program
? Permittee Responsible Mitigation
3. Complete if Using a Mitigation Bank
3a. Name of Mitigation Bank:
3b. Credits Purchased (attach receipt and letter) Type Quantity
3c. Comments:
4. Complete if Making a Payment to In-lieu Fee Program
4a. Approval letter from in-lieu fee program is attached. ? Yes
4b. Stream mitigation requested: linear feet
4c. If using stream mitigation, stream temperature: ? warm ? cool ?cold
4d. Buffer mitigation requested (DWQ only): square feet
4e. Riparian wetland mitigation requested: acres
4f. Non-riparian wetland mitigation requested: acres
4g. Coastal (tidal) wetland mitigation requested: acres
4h. Comments:
5. Complete if Using a Permittee Responsible Mitigation Plan
5a. If using a permittee responsible mitigation plan, provide a description of the proposed mitigation plan.
Page 7 of 11
PCN Form - Version 1.3 December 10, 2008 Version
6. Buffer Mitigation (State Regulated Riparian Buffer Rules) - required by DWQ
6a. Will the project result in an impact within a protected riparian buffer that requires
buffer mitigation? ? Yes ® No
6b. If yes, then identify the square feet of impact to each zone of the riparian buffer that requires mitigation. Calculate the
amount of mitigation required.
Zone 6c.
Reason for impact 6d.
Total impact
(square feet)
Multiplier 6e.
Required mitigation
(square feet)
Zone 1 3 (2 for Catawba)
Zone 2 1.5
6f. Total buffer mitigation required:
6g. If buffer mitigation is required, discuss what type of mitigation is proposed (e.g., payment to private mitigation bank,
permittee responsible riparian buffer restoration, payment into an approved in-lieu fee fund).
6h. Comments:
Page 8 of 11
E. Stormwater Management and Diffuse Flow Plan (required by DWQ)
1. Diffuse Flow Plan
1a. Does the project include or is it adjacent to protected riparian buffers identified ? Yes ® No
within one of the NC Riparian Buffer Protection Rules?
1 b. If yes, then is a diffuse flow plan included? If no, explain why.
? Yes ? No
Comments:
2. Stormwater Management Plan
2a. What is the overall percent imperviousness of this project? 0%
2b. Does this project require a Stormwater Management Plan? ? Yes ® No
2c. If this project DOES NOT require a Stormwater Management Plan, explain why: The project involves work in the stream
only; no work will be performed outside the stream corridor and no impervious area w ill be added during this project
2d. If this project DOES require a Stormwater Management Plan, then provide a brief, narrative description of the plan:
? Certified Local Government
2e. Who will be responsible for the review of the Stormwater Management Plan? ? DWQ Stormwater Program
? DWQ 401 Unit
3. Certified Local Government Stormwater Review
3a. In which local government's jurisdiction is this project?
? Phase II
3b. Which of the following locally-implemented stormwater management programs ? NSW
? USMP
apply (check all that apply): ? Water Supply Watershed
? Other:
3c. Has the approved Stormwater Management Plan with proof of approval been ? Yes ? No
attached?
4. DWQ Stormwater Program Review
? Coastal counties
? HQW
4a. Which of the following state-implemented stormwater management programs apply ? ORW
(check all that apply):
? Session Law 2006-246
? Other:
4b. Has the approved Stormwater Management Plan with proof of approval been
attached? ? Yes ? No
5. DWQ 401 Unit Stormwater Review
5a. Does the Stormwater Management Plan meet the appropriate requirements? ? Yes ? No
5b. Have all of the 401 Unit submittal requirements been met? ? Yes ? No
Page 9 of 11
PCN Form - Version 1.3 December 10, 2008 Version
F. Supplementary Information
1. Environmental Documentation (DWQ Requirement)
1 a. Does the project involve an expenditure of public (federal/state/local) funds or the ? Yes ® No
use of public (federal/state) land?
1b. If you answered "yes" to the above, does the project require preparation of an
environmental document pursuant to the requirements of the National or State ? Yes ? No
(North Carolina) Environmental Policy Act (NEPA/SEPA)?
1c. If you answered "yes" to the above, has the document review been finalized by the
State Clearing House? (If so, attach a copy of the NEPA or SEPA final approval
? Yes ? No
letter.)
Comments:
2. Violations (DWQ Requirement)
2a. Is the site in violation of DWQ Wetland Rules (15A NCAC 2H .0500), Isolated
Wetland Rules (15A NCAC 2H .1300), DWQ Surface Water or Wetland Standards, ? Yes ® No
or Riparian Buffer Rules (15A NCAC 2B.0200)?
2b. Is this an after-the-fact permit application? ? Yes ® No
2c. If you answered "yes" to one or both of the above questions, provide an explanation of the violation(s):
3. Cumulative Impacts (DWQ Requirement)
3a. Will this project (based on past and reasonably anticipated future impacts) result in ? Yes ® No
additional development, which could impact nearby downstream water quality?
3b. If you answered "yes" to the above, submit a qualitative or quantitative cumulative impact analysis in accordance with the
most recent DWQ policy. If you answered "no," provide a short narrative description.
This is a stream enhancement project and will not cause an increase in development nor will it negatively impact
downstream water quality.
4. Sewage Disposal (DWQ Requirement)
4a. Clearly detail the ultimate treatment methods and disposition (non-discharge or discharge) of wastewater generated from
the proposed project, or available capacity of the subject facility.
Page 10 of 11
PCN Form - Version 1.3 December 10, 2008 Version
5. Endangered Species and Designated Critical Habitat (Corps Requirement)
5a. Will this project occur in or near an area with federally protected species or ? Yes ® No
habitat?
5b. Have you checked with the USFWS concerning Endangered Species Act ? Yes ® No
impacts?
?
Raleigh
5c. If yes, indicate the USFWS Field Office you have contacted. ? Asheville
5d. What data sources did you use to determine whether your site would impact Endangered Species or Designated Critical
Habitat?
Prior permit approval was received with no issues pertaining to the impact of Endangered Species or Designated Habitat.
Utilized the NC Natural Heritage Program's element occurrence GIS data layer. Two element occurrences are within
approximately 1 mile of the project. The proposed project is located within the stream footprint of two residential parcels
and will have no impact on Endangered Species or Designated Critical Habitat.
6. Essential Fish Habitat (Corps Requirement)
6a. Will this project occur in or near an area designated as essential fish habitat? ? Yes ® No
6b. What data sources did you use to determine whether your site would impact Essential Fish Habitat?
Prior permit approval was received with no issues pertaining to the impact of Essential Fish Habitat. This stream
enhancement project will have a positive impact to in-stream habitat and downstream waters.
7. Historic or Prehistoric Cultural Resources (Corps Requirement)
7a. Will this project occur in or near an area that the state, federal or tribal
governments have designated as having historic or cultural preservation ? Yes ® No
status (e.g., National Historic Trust designation or properties significant in
North Carolina history and archaeology)?
7b. What data sources did you use to determine whether your site would impact historic or archeological resources?
Prior permit approval was received with no issues pertaining to the impact of historic or archeological resources. The
proposed project is located within the stream footprint of two residential parcels and will have no impact on these
resources.
8. Flood Zone Designation (Corps Requirement)
8a. Will this project occur in a FEMA-designated 100-year floodplain? ? Yes ® No
8b. If yes, explain how project meets FEMA requirements:
8c. What source(s) did you use to make the floodplain determination? FEMA floodplain GIS data layer.
(qtr Yt T- -re-5
ApplicantlAgent's Printed Name Applicant/Ag is Signature Date
(Agent's sign re is valid only if an a orization letter from the applicant
is provided.)
Page 11 of 11
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Project Area Figure 1. USGS Map
0 Project Watershed Faust Site Stream
WILDLANDS
Enhancement Project
0 250 500 1,000
Feet Cabarrus Count) f NC
601,
40
?-? Project Area
Q Figure 2. 2006 Aerial Map
_ Project Watershed Faust Site Stream
Streams Enhancement Project
Wl LDLANDS ,Z5 z5° 5°°
Feet Cabarrus County, NC
Faust Site Stream Enhancement
Existing Conditions and Design Summary
Wildlands Engineering is developing construction documents for a stream enhancement project
on 391 linear feet of degraded and incised unnamed tributary on the Faust and Mattes properties
in Concord, NC. This memorandum summarizes our watershed assessment and design
parameters for the unnamed tributary. Figure 1 illustrates the project site and the UT watershed.
A photo log of the project is also attached.
Watershed Delineation
The project site is located in western Cabarrus County in the City of Concord in the Yadkin River
basin. The drainage area to the UT is approximately 0.22 square miles (145 acres). The
drainage area of the creek historically was used as a quarry as shown in Figure 1, but has been
developed for residential land use (Figure 2). The UT flows into another unnamed tributary which
then flows into Coddle Creek. On-Site jurisdictional waters were verified from the previous permit
submittal, USACE Action Id. SAW-2008-1586 and DWQ# 08-0820.
Land Use
The Faust Site watershed is located in a largely residential setting; approximately 58% of the land
in the watershed has been developed, primarily for residential use. The land uses within the
watershed include residential (57%), forested/agricultural (42%) and industrial/commercial (1%).
Approximately 18% of the land surface in the watershed is impervious. A residential development
in the southern part of the watershed is being planned which, once constructed, will increase the
impervious surface in the watershed to approximately 20%.
Soils
The primary soil type found within the floodplain of the project site is Poindexter loam, 8 to 15%
slopes soils. These soils are strongly sloping, well drained, and moderately deep. They formed in
residuum from mafic or a mixture of felsic and mafic rock. Their subsurface layer is loamy.
Permeability is moderate and shrink-swell potential is low. The seasonal high water table is below
6 feet. (National Soil Information (NASIS) Database, 2008)
Existing Stream Condition
The UT is currently incised, with bank height ratios in the 1.2 to 2.0 range. The portion of the
tributary being restored lacks bedform diversity such as deep pools and steep riffles. The
upstream section of UT is actively and becomes disconnected to its floodplain in the downstream
section. UT has moderate woody vegetation to help stabilize the banks.
Bankfull Estimation
The NC Piedmont regional curve was used to predict an appropriate bankfull discharge and
cross-sectional area for the design reach. The upstream watershed has developed over the last
10 years. The existing channel is incising and bankfull indicators shift downward as the channel
incises. Clearly defined bankfull indicators were not observed in the field. The bankfull discharge
used for this design is 70 cfs; the cross-sectional area is 12 square feet.
Design Summary
The channel is designed as an enhancement due to horizontal constraints such as a house and
vertical constraints of tying into the existing channel elevation at the upstream and downstream
property lines. Excavation of bankfull benches will take for most of the project length. Bankfull
bench widths will be a minimum of 15 feet and will be tied into the existing grade at a 2:1 slope or
flatter. Entrenchment ratios are designed to be greater than 1.4. Bank height ratios are designed
to be at 1.0.
The upper portion of the design reach has a flatter slope and can support a riffle-pool bedform
without vertical steps. A new channel will be constructed that will have greater sinuosity than the
existing channel. Full restoration sinuosity cannot be achieved due to the proximity of the house
and mature hardwoods. Constructed riffles with log sills will be used to set grades.
The steeper downstream portion of the existing UT has a bedrock channel bottom and will not be
relocated. The majority of the work in this section will consist of stabilizing the vertical right bank
by installing boulder toe protection, grading the bank to a flatter slope and planting vegetation.
A summary of design parameters is attached as Table 1. Typical riffle and pool cross-sections
are summarized in Figure 3. A plan and profile sheet, details, planting plan and an erosion control
plan are included in the plan set.
Wildlands Engineering Page 2
Faust Site Existing Conditions and Design Summary August 27, 2010
Channel Parameters
Bankfull Area (ft2)
Max Depth (Bkf) (ft)
Mean Depth (bkf) (ft)
Bankfull Width (ft)
Width/Depth Ratio
Slope 4-5 (Bank Slope)
Slope 5-6 (Channel slope)
Slope 6-7 (Channel slope)
Slope 7-8 (Bank Slope)
max depth/ mean depth ratic
3.56
0.75
0.51
7.00
13.75
30
0.0
0.0
3.0
1.47
Channel Parameters
:rnkfull Area (ft2) 5.19
"ax Depth (Bkf) (ft) 1.00
'.l-an Depth (bkf) (ft) 0.61
inkfull Width (ft) 8.50
dth/Depth Ratio 13.93
,pe 4-5 (Mid-channel Slope) 3.0
'Pe 5-6 (Channel slope) 8.0
pe 6-7 (Channel slope) 80
:,Iwdnttie 1.33
.%:,ool/wriffle i .21
Channel pafame''lef,
%.snkfull Area (ft2) x.47
'."pax Depth (Bkf) (ft) 1.00
-an Depth (bkf) (ft) 0.59
-iankfull Width (ft) 925
'd dth/Depth Ratio 15.65
)pe 4-5 (Mid-channel Slope) 5.0
ope 5-6 (Channel slope) 12,0
)pe 6-7 (Channel slope) 4.0
ve 7-8 (Bank Slooe) 20
dpooi/driffle 0.50
wpool/wriffle 0.93
Apool/Ariffle 0.46
Figure 3
Typical Cross-Sections
Riffle Cross-Section
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1.00
c 0.00
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W
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-3.00
55 60
40 45 50
Distance (ft)
In 1. inf- Pool Cross Section
40
2
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-4
60
45 50 55
Distance (ft)
Mf:arsder Pooi Cross Section
40 50 60 70
Distance (ft)
80 90
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