20081263 Ver 1_Mitigation Plans_20090709

Davis Branch and Unnamed Tributary
Mitigation Plan
•
Union County
North Carolina
NC EEP Project Number: D06054-F
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Prepared for:
1
NCDENR -EEP RECEIVED
2728 Capital Blvd, Suite 1 H 1 i U i ?l •? Y11 S 009
Raleigh NC 27604 0- w hlC ECOS
EWN NCEMENT PROGRAM
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Submitted: June 23, 2009
•
Prepared by:
Wetlands Resource Center
3970 Bowen Road
Canal Winchester, Ohio 43110
Project Manager: Cal Miller
P: [phone]
F: [phone]
And
EMH&T, Inc.
5500 New Albany Road
Columbus, Ohio 43054
Project Manager: Miles F. Hebert, PE
P: [phone]
F: [phone]
Main: [phone]
Evans, Mechwart, Hambleton & Tilton, Inc.
Engineers, Surveyors, Planners, Scientists
0
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
TABLE OF CONTENTS
Executive Summary ............................................................................................................................1
1.0 Project Background .................................................................................................................. 6
1.1 Project Site Location and Details
1.2 Pre-restoration Existing Conditions
2.0 Restoration Summary ............................................................................................................ 33
2.1 Mitigation Goals and Objectives
2.2 Restoration Approach
2.3 Bankfull Verification
2.4 As-Built Channel Stability Assessment
3.0 Monitoring Plan ..................................................................................................................... 51
3.1 Stream Channel Monitoring
3.2 Planted Woody Vegetation Monitoring
3.3 Performance Standards
4.0 Maintenance and Contingency Plans ................................................................................... 54
• 5.0 References ...............................................................................................................................55
6.0 Figures
Figure 1 - Davis Branch & Unnamed Tributary Site Vicinity Map
Figure 2 - Davis Branch & Unnamed Tributary Targeted Local Watershed Subbasin Map
Figure 3 - Davis Branch & Unnamed Tributary Project Stream Reaches
Figure 4 - Davis Branch and Unnamed Tributary Reference Reach & Site Watershed Map
Figure 5 - Davis Branch Reference Reach Pattern Summary Map
7.0 As-Built Plan Sheets
Tables
Table 1 - Summary of Drainage Areas ........ :.................................................................................... 16
Table 2a through 2c - Baseline Geomorphologic and Hydraulic Summary Data ............................ 39
Table 3a - As-Built Predicted Streambank Erosion Rates for Davis Branch Mainstem
Table 3b - As-Built Predicted Streambank Erosion Rates for Davis Branch UTl
Table 3c - As-Built Predicted Streambank Erosion Rates for Davis Branch (Project Summary)
Table 4 - Restoration Summary Table .............................................................................................. 49
Appendices
Appendix A - Davis Branch and Unnamed Tributary As-Built Photographic Documentation
Appendix B - As-Built Long-Term Monitoring Profiles
• Appendix C - As-Built Long-Term Monitoring Cross-Section & Substrate Summary Templates
Appendix D - Supporting Documentation
Evans, Mechwart, Hambleton & Tilton, Inc.
Engineers, Surveyors, Planners, Scientists
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
• EXECUTIVE SUMMARY
As discussed in the Restoration Plan for Davis Branch and an associated unnamed tributary
(UT1), the mitigation goals and objectives for the project involved restoring stable physical and
biological function of the project streams beyond pre-restoration (impaired) conditions. Impaired
conditions consisted of channelized, eroding, incised and entrenched stream channels. Nutrient
and sediment loading from agricultural land use and runoff, together with vegetative denuding
and destabilized streambanks associated with hoof shear resulting from uncontrolled cattle access
was evident. The specific mitigation goals and objectives proposed and achieved for the project
are listed below.
• Stable stream channels with features inherent of ecologically diverse environments, with
appropriate streambed features including appropriately spaced pool and riffle sequences,
and riparian corridors planted with a diversity of indigenous vegetation.
• Superimposed reference reach boundary conditions on the impaired project reaches in the
restoration design and construction of improvements.
• Constructed stream channels with the appropriate geometry and gradient to convey
bankfull flows while entraining suspended sediment (wash load) and bedload materials
readily available to the streams.
• Created an improved connection between the bankfull channels and their floodprone
• areas, with stable channel geometries, protective vegetation and jute coir fabric to prevent
erosion.
• Minimized future land use impacts to project stream reaches by conveying a perpetual,
restrictive conservation easement to the State of North Carolina, including stream
corridor protection via livestock exclusion fencing at the surveyed and recorded
conservation easement boundaries, with gates at the edge of the riparian corridor on river
right and left at reserved conservation easement crossings adjacent to active pasture land.
The restoration of Davis Branch mainstem and UT1 met the project goals and objectives set forth
in the restoration plan, by providing desired habitat and stability features required to enhance and
provide long-term ecologic health for the project reaches. More specifically, the completed
restoration project has accomplished the enhancements listed below.
Davis Branch Mainstem:
• Reversed the effects of channelization using a Priority Level VLevel R (PW and
Enhancement Level I (EI) restoration approaches; restoration increased the average
width/depth ratio from 9.13 to 19.34 on the PIM reach and from 6.91 to 27.02 on the
El reach.
• Restored natural pattern to the channel alignment, increasing sinuosity from 1.12 to
1.29 on the PI/II reach, while maintaining a stable relationship between the valley
slope and bankfull slope (the bankfull slope was steeper than the valley slope prior to
• restoration and is now less than the valley slope post-restoration). Stable pattern,
profile and dimension were restored based on extrapolation from reference reach
Evans, Mechwart, Hambleton & Tilton, Inc.
Engineers, Surveyors, Planners, Scientists Page 1
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
• boundary conditions. On the mainstem El reach, profile and dimension were restored
based upon reference reach boundary conditions.
• Stabilized eroding streambanks by constructing appropriately sized channels with
stable streambank slopes, built using a combination of embedded stone, grade
control structures, topsoil, herbaceous seeding, mulch, natural fabrics and hearty
vegetative live branch (3-foot spacings), bareroot (4-foot spacings) and 1-gallon tree
(100-foot spacings) plantings.
• The average Bank Height Ratio was decreased from 1.41 to 1.00 on the PFH reach
and 1.86 to 1.00 on the El reach, respectively (i.e., extremely incised to stable).
• Restored connection between the bankfull channel and the adjacent floodprone area
by raising the bankfull channel to the elevation of the adjacent floodplain. The
restored mainstem PLM and El reach entrenchment ratios range from 3.75 to 12.30
(stable).
• Created instream aquatic habitat features, including appropriately spaced pool and
riffle sequences, and a stable transition of the mainstem reach El thalweg to the
invert of the existing channel at the bottom of the mainstem project reach.
• Revegetated the riparian corridor with indigenous canopy, mid-story, shrub and
herbaceous ground cover species, and preserved existing forested riparian corridors
where present.
• Protected the riparian corridor by placing livestock exclusion fencing at the edge of
• the perpetual, recorded conservation easement boundary.
Unnamed Tributary I (UTI):
• Reversed the effects of channelization through a combination of Enhancement Level
H (EH) and Priority Level I (PI) restoration techniques. The average width/depth
ratio of the restored UT1 project reach is 29.13. Stable dimension and grade control
was restored on the EH reach (as-built profile station 0+00 to 3+96). Stable pattern,
profile and dimension were restored on the PI reach (as-built profile station 3+96 to
8+54) based on extrapolation from reference reach boundary conditions.
• Restored stable channel pattern on the PI reach, increasing sinuosity from 1.09 to
1.37.
• Stabilized eroding streambanks by providing appropriately sized channels with stable
streambank slopes. The average Bank Height Ratio has been reduced from 2.82 to
1.00 (extremely incised to stable).
• Improved the connection between the restored stream channel and the adjacent
floodprone area by raising the bankfull channel to the elevation of the adjacent
floodplain. The completed restoration increased the average entrenchment ratio from
3.63 to 4.38.
• Created stable channel dimensions, substrate and grade control structures (rock sills)
on the El reach; Created stable pattern, profile and dimension, including
appropriately spaced riffle, run, pool and glide sequences, together with a stable
• transition of the UT1 PI reach thalweg at its confluence with the Davis Branch
Mainstem.
Evans, Mechwart, Hambleton & Tilton, Inc.
Engineers, Surveyors, Planners, Scientists Page 2
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•
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ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
• Revegetated the riparian corridor with indigenous canopy, mid-story, shrub and
herbaceous ground cover, preserved existing forested riparian corridors where
present.
• Protected the riparian corridor by placing livestock exclusion fencing at the edge of
the perpetual, recorded conservation easement boundary.
The following table summarizes pre-existing and post-restoration stream lengths, mitigation
approach and identification of the reaches restored as presented throughout this Mitigation Plan.
The original Restoration Plan includes mitigation specific to the Davis Branch mainstem and an
unnamed tributary (UT 1). The stream segments and reach identifications used in this table are
shown on the As-Built Plan Sheets in Section 7.0 and on Figure 3.
Pre-Existing Conditions/Post-Construction Summary
Project Number D06054-F (Davis Branch and Unnamed Tributary 1)
Project Pre-existing Restored Restoration Credit Ratio SMUs**
Reach ID length Length* Level
Davis Branch 781 l.f. 7661.f.* 5 153
Mainstem Preservation
Davis Branch 1,5621.f. 1,7991.f. Priority Level 1 1,799
Mainstem IM Restoration
Davis Branch 1,2891.f. 1,2291.f.* Enhancement 1.5 819
Mainstem Level I
Restoration
UT1 3961.f. 3961.f. Enhancement 2.5 158
Level H
Restoration
UT1 3341.f. 4591.f. Priority Level I 1 459
Restoration
Totals
IT 1 i 4,649 11 3,388
x.. a "JL%,U u416L11 cxL;iuueS permanent conservation easement crossings.
**Restored Length divided by SMU Credit Ratio
To demonstrate the success of the project, three forms of monitoring will be performed: (1) photo
documentation; (2) ecological function assessment; and (3) channel stability measurements.
Demonstration of long-term success of channel features will be tested in terms of a minimum
exposure to two (2) bankfull events occurring in separate monitoring years. The monitoring shall
be performed each year for the 5-year monitoring period. Long-term success will be evaluated by
monitoring and documenting the criteria listed below.
1. Channel aggradation or degradation.
2. Streambank erosion.
3. Presence of in-stream bar deposits.
Evans, Mechwart, Hambleton & Tilton, Inc.
Engineers, Surveyors, Planners, Scientists
Page 3
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
4. Health and survival of indigenous, non-invasive vegetation (80% survival of planted
species after 5 years).
5. Changes in as-built channel pattern, profile and dimension (should be minimal in
comparison to as-built conditions, noting minor changes may represent increases in
stability). Maintenance of floodplain connectivity, with respect to dimension, is a key
success criteria.
The annual long-term monitoring of the constructed project reaches includes 3,547 11.
longitudinal profile surveys (i.e., 1,799 l.f. Davis Branch mainstem restoration reach + 1,289 l.f.
Davis Branch Enhancement Level I reach + 4591.f. UTI restoration reach = 3,5471.f. total); nine
monumented cross-sections, collection and analysis of particle distributions at each of the
monumented cross-sections; and ten vegetation monitoring plots with live branches, herbaceous
ground cover, shrub, mid-story and canopy plantings representative of indigenous streamside,
meanders bends, floodplain and riparian zone plant communities. Two galvanized steel, USGS
Type A, 4-foot crest gages have been installed on the project reaches; one crest gage is installed
on the right bank at profile station 19+16 on the mainstem restoration reach, and the second is
installed near the confluence of UTl with Davis Branch mainstem on the left bank at profile
station 6+59, as shown on the As-Built plan sheets in Section 7.0, to document bankfull and
greater flows.
. Stream monitoring will be in accordance with the multi-agency, North Carolina Stream
Mitigation Guidelines (April 2003) applicable to Priority Level IM Restoration projects,
following the template for Content, Format and Data Requirements for EEP Monitoring
Reports, Version 1.2 (November 16, 2006). Vegetation monitoring will be conducted in
accordance with CVS-EEP Protocol for Recording Vegetation, Version 4.0 (Lee, M.T., Peet,
RK., Roberts, S.R., Wentworth, T.R. 2006) for Levels 1 and 2 Plot Sampling. Throughout the
monitoring period, remedial action will be performed based on agency review of monitoring
documents, and decision making between EEP and the provider to ensure the long-term success
of the Davis Branch and Unnamed Tributary Mitigation Project.
Differences Between Design and As-Built Conditions
The "As-Built" geomorphologic parameters in this report show some notable differences in
comparison to design parameters for the project stream reaches. The detailed Rosgen Level III
reference reach study conducted downstream from the project reaches on Davis Branch shows
stable E-type channel geomorphologic relationships were indicated for both the Davis Branch
mainstem and UT I. In each case the "As-built" reaches have C-type channel geomorphologic and
hydraulic relationships with approximately the same cross-sectional areas proposed in the design.
The detailed assessment of the "As-Built" conditions presented in this mitigation plan show the
restored streams are stable, properly sized and well connected to their floodplains. Additionally,
the "As-Built" project stream reaches meet the mitigation goals and objectives acknowledged as
set forth in the project Restoration Plan.
i
Evans, Mechwart, Hambleton & Tilton, Inc.
Engineers, Surveyors, Planners, Scientists Page 4
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ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
Davis Branch Mainstem Restoration Reach
The most notable differences when comparing the "As-Built" geomorphologic conditions to the
proposed design conditions in the Restoration Plan are listed below.
1. The median bankfull width is 25 percent greater than proposed (9.0 ft to 11.3 ft)
2. The median bankfull mean depth is 32 percent less than proposed (0.88 ft to 0.60 ft)
3. The median floodprone width is 25 percent less than proposed (117 ft to 88 ft)
4. The median entrenchment ratio is 35 percent less than proposed (13.1 to 8.5)
5. The median width/depth ratio 47 percent greater than proposed (10.2 to 19.3)
Despite the differences between design and "As-Built" channel morphology, the bankfull cross-
sectional area under design and "As-Built" conditions is similar ' (7.9 ft2 vs. 7.0 ft2). The
entrenchment ratio is very stable (8.5). The transition from the designed E-type channel to the
"As-Built" C-type channel remains stable and functional from an ecologic enhancement
perspective. Additionally, "As-Built" pattern and profile slope, from the top to the bottom of the
1,799 l.f. mainstem restoration reach, is consistent with proposed conditions in the site
Restoration Plan.
UT I Restoration Reach
• The most notable differences when comparing the "As-Built" geomorphologic data to the
proposed design conditions in the Restoration Plan are listed below.
1. The median bankfull width is 50 percent greater than proposed (6.2 ft to 12.4ft)
2. The median bankfull mean depth is 40 percent less than proposed (0.72 ft to 0.43 ft)
3. The median entrenchment ratio is 43 percent less than proposed (7.7 to 4.4)
4. The median width/depth ratio is 70 percent greater than proposed (8.6 to 29.1)
?J
Despite these changes between design and "As-Built" conditions, the bankfull cross-sectional
area under design and "As-Built" conditions is similar (4.5 ft2 vs. 5.3 ft2). The entrenchment ratio
is stable (4.4). The median floodprone width is 12 percent greater than proposed (54.1 ft vs. 47.4
ft). The transition from the designed E-type channel to the "As-Built" C-type channel remains
stable and functional from an ecologic enhancement perspective. "As-Built" pattern and profile
slope, from the top to the bottom of the 459 l.f. UT I restoration reach, is consistent with
proposed conditions in the site Restoration Plan.
Evans, Mechwart, Hambleton & Tilton, Inc.
Engineers, Surveyors, Planners, Scientists
Page 5
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
•
1.0 PROJECT BACKGROUND
1.1 Protect Site Location and Details
The project is located southeast of Olive Branch Road and west of Marshville-Olive Branch
Road, 7.8 miles north-northeast of the town of Marshville, Union County, North Carolina.
The site location and vicinity map is presented on Figure 1. The project is located on
properties owned by Edward Bruce Staton and wife Deborah H. Staton, and Keith Bunyan
Griffin and wife Phyllis Griffin. The project includes restoration activities along Davis
Branch mainstem and one unnamed tributary stream, designated as UT1 throughout this
document.
To travel to the site from U.S. Route 74 in Marshville, North Carolina, turn onto North Elm
Street (SR 205) and travel 5.3 miles to Olive Branch Road (SR 1006). Turn right onto Olive
Branch Road and travel 3.9 miles to 9406 Olive Branch Road (Edward and Deborah Staton
Residence). Turn right onto the Staton's driveway, the dedicated egress/ingress access to the
recorded EEP Conservation Easement Areas on the Davis Branch and Unnamed Tributary,
Stream Restoration Project.
USGS Hydrologic Unit Code and NCDWQ River Basin Designations
The Davis Branch watershed is located within the USGS 14-digit HUC watershed
03040105070080. Davis Branch is a tributary to Gourdvine Creek, to Richardson Creek to
the Rocky River in the Lower Yadkin-Pee Dee River Subbasin 03-07-14, as shown on Figure
2. The project is not located within a North Carolina Wetland Restoration Program (WRP)
targeted watershed; however, it is located immediately north of Beaverdam Creek WRP
Targeted Watershed 81030. The project stream reaches are mapped on North Carolina
Department of Transportation, Light Detection and Ranging (LiDAR) March 2005 coverage
for Union County, North Carolina as shown on Figure 3.
Physiography
The Davis Branch watershed is located in the Piedmont Physiographic Province of south
central North Carolina in the Carolina Slate Belt Ecoregion (Draft Level III and Level IV
Ecoregions of North Carolina, USEPA, USDA-NRCS & NCDENR, August 17, 2000).
Valley Type VIII (Rosgen, 1996) is the most readily identified landform along the lower
2,100 l.f. mainstem reach corridor, with subtle terraces positioned laterally along the broad
valley. Floodprone widths vary from 120 to 150 feet with moderate, down-valley elevation
relief. Alluvial terraces and floodplains are the predominant depositional features in this
fluvial geomorphologic system and produce a high sediment supply. On UT I and the
upstream east-west trending reach on the mainstem, the valley narrows and transitions to a
moderately steep, gentle sloping side slopes Type II colluvial valley. As shown on Figure 2
• and Figure 3 the first and second order Davis Branch stream reaches are headwater streams
to Gourdvine Creek to Richardson Creek in the Rocky River Basin. Existing valley slopes for
the project reaches range from 0.0170 ft/ft to 0.0249 ft/ft with elevations from the upstream
Evans, Mechwart, Hambleton & Tilton, Inc. Page 6
Engineers, Surveyors, Planners, Scientists
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
•
watershed divide to the mouth of Davis Branch ranging from 526 feet to 390 feet (NAVD
88), with a total local elevation relief of 136 feet.
Geology
In the project vicinity, bedrock consists of heated and deformed (metamorphosed)
sedimentary and volcanic rock. Bedrock is exposed at outcrops in the streambeds along the
mainstem and the lower segment of UT 1. Exposed bedrock is dense, crystalline on a
microscopic scale (i.e., grains not visible to the naked eye), slate. The Carolina Slate Belt was
the site of a series of oceanic volcanic islands about 550 - 650 million years ago (Pre-
Cambrian and Cambrian Systems). Metamorphic rocks that occur in this region include meta-
mudstone and meta-argillite (slate), thin to thick bedded, bedding planes and axial-planar
cleavage common, interbedded with meta-sandstone, meta-conglomerate and meta-volcanic
rock.
Four formations are recognized in the Union County, North Carolina portion of the Carolina
Slate Belt section - from oldest to youngest, the Uwharrie Formation, Tillery Formation,
McManus Formation and Yadkin Formation, that together comprise over 16,500 feet of the
Lower Paleozoic Section in south-central North Carolina. The Uwharrie Formation represents
a period of extensive volcanism with the formation of crystal lithic and devitrified tuffs, a
• rock formed from compacted volcanic fragments, generally smaller than four millimeters in
diameter, incorporated in a micro-crystalline groundmass. The Tillery Formation consists of
thin bedded, laminated argillite with some interbedded non-laminated argillite and sandstone.
Thick bedded, tuffaceous argillite characterizes the McManus Formation which also contains
an appreciable amount of crystal tuff and very fine-grained sandstone. The youngest unit is
the is the Yadkin Graywacke which consists of thick bedded graywacke and laminated
argillite. Quartz and igneous intrusions are found in all of the units. The age of the rocks
studied is Early Paleozoic, probably Cambrian or Ordovician.
17_?
Evans, Mechwart, Hambleton & Tilton, Inc.
Engineers, Surveyors, Planners, Scientists
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ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
•
• The Davis Branch mainstem and UT1 project reaches are located on the northwest limb of
the northeast-southwest trending Troy Anticlinorium near the axial plane of a small unnamed
syncline. The axial plane (i.e., fold crest orientation) strikes N49°E, with a regional bedding
plane dip angle of 37° to the northwest. Across the fold axis to the southeast, the regional
bedding plane dip angle is somewhat less steep, 29° to the southeast. The Troy Anticlinorium
represents a series of local anticlines (upward folded arches) and synclines (downward folded
troughs) that regionally form a large anticline. The local folds are open and predominantly
asymmetric, mimicking the asymmetric geometry of the parent fold. Axial plane cleavage
(rock splitting planes essentially parallel to the axial plane of the fold) is best developed
where argillites (i.e., slate - metamorphosed, fine-grained mudstone and clay) are involved in
the folding.
Locally, the site is underlain by the McManus Formation which comprises approximately
11,600 feet, or approximately 70 percent of the Carolina Slate Belt section in Union County,
North Carolina. On the project stream reaches, large, blocky cobble deposited on the
streambed is a secondary substrate, resulting from physical weathering of the highly
fractured, steeply dipping, thick-bedded slate bedrock.
On site, the dominant bedding plane orientation strikes N65°E and dips 55° to the northwest.
The average stream bedrock protrusion height is 0.57 feet (or 174 mm) based on Rosgen
Level III field measurements. Bedrock outcrops along the restored Davis Branch mainstem
restoration reach, the mainstem Enhancement Level I reach, and the UT 1 restoration reach.
The Davis Branch reference reach, located downstream from the mainstem project reach on
the north side of Olive Branch Road, has strong bedrock control as well. Bedrock exposed in
the streambeds is dense, crystalline on a microscopic scale (grains not visible to the naked
Evans, Mechwart, Hambleton & Tilton, Inc. Page 8
Engineers, Surveyors, Planners, Scientists
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
eye), moderately to steeply dipping, fractured, medium to thick bedded slate. The following
photograph shows typical bedrock streambed conditions on the upper section of the mainstem
Enhancement Level I reach. The following photograph shows the onsite quarry (now
reclaimed, seeded and stabilized) utilized as a source for instream structure stone during
construction of the project stream reaches. Note the steeply dipping bedding planes and rock
cleavage in the thick bedded slate bedrock of the McManus Formation.
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Detailed local geologic structure and stratigraphy are from Randazzo, A.F., Petrography and
Stratigraphy of the Carolina Slate Belt Union County, North Carolina, Ph.D. Thesis
(University of North Carolina at Chapel Hill, 1968). The structural geologic map on the
following page is published in the cited thesis.
Evans, Mechwart, Hambleton & Tilton, Inc. Page 9
Engineers, Surveyors, Planners, Scientists
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ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
• Soils
Mapped soil units within the project site and vicinity and taxonomic descriptions are from the
USDA NRCS, Soil Survey of Union County, North Carolina (USDA - NRCS, January 1996).
The soils along Davis Branch mainstem and UT 1 have been derived from and developed over
crystalline on a microscopic scale (grains not visible to the naked eye), dense metamorphic
rock formations (i.e., meta-mudstone and meta-argillite, geologic nomenclatures synonymous
with slate).
The predominant soil type mapped on the Davis Branch mainstem is the Cid channery silt
loam, 1 to 5 percent slopes. This map unit consists mainly of moderately deep, moderately
well drained and somewhat poorly drained, nearly level and gently sloping Cid and similar
soils on flats, on ridges in the uplands, in depressions and in headwater drainageways.
Typically, the surface layer is light brownish gray channery silt loam 4 inches thick. The
subsurface layer is a pale yellow channery silt loam 5 inches thick. The subsoil is 18 inches
thick. In the upper part, it is light olive brown silty clay that has light brownish gray mottles.
In the lower part, it is mottled grayish brown and light olive brown channery silty clay.
Weathered, fractured slate bedrock is encountered at a depth of about 27 inches. Hard,
fractured slate bedrock is encountered at a depth of about 32 inches. Permeability is slow in
the Cid soil. Average water capacity is low or moderate. The shrink-swell potential is
• moderate. A seasonal high water table is perched between 1.5 to 2.5 feet below ground
surface from December through May. The depth to hard bedrock ranges from 20 to 40 inches.
The hazard of erosion is moderate on construction sites if the ground cover is removed. This
map unit is used mainly as cropland, hay, pasture or woodland. The following photograph
shows the entire Cid pedon section, exposed to erosion along the east (river right) bank of
Davis Branch, taken on April 15, 2008, facing upstream.
•

i

Evans, Mechwart, Hambleton & Tilton, Inc.
Engineers, Surveyors, Planners, Scientists
Page I I
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
E

•
The next photograph, taken at the bottom of the mainstem reach on March 9, 2006, shows the
Cid pedon section, with nutrient laden water, as evidenced by prolific algae bloom, attributed
to agricultural runoff exacerbated by livestock intrusion, and hoof-shear streambank
destabilization leading to streambank failure and erosion.

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Included with the Cid soils on site are areas of Badin channery silt loam (map symbol - BaB),
2 to 8 percent slopes, mapped on river left along the mainstem Priority Level I/H restoration
reach on the Staton property and along the mainstem preservation reach on the Griffin
property.
The Badin map unit consists mainly of moderately deep, well drained undulating soils on
convex upland ridges that are highly dissected by intermittent drainageways. Individual areas
are irregular in shape and range from 5 to more than 100 acres in size.
Typically, the surface layer is brown Channery silt loam 7 inches thick. The subsoil is 21
inches thick. In the upper part, it is red silty clay. In the lower part, it is red Channery silty
clay loam that has yellow and strong brown mottles. Weathered, fractured slate bedrock is
encountered at a depth of about 28 inches. Hard, fractured slate bedrock is at a depth of about
41 inches. In some eroded areas where the upper part of the subsoil has been mixed with the
surface soil by plowing, the surface layer is reddish brown Channery silty clay loam.
Evans, Mechwart, Hambleton & Tilton, Inc. Page 12
Engineers, Survevors, Planners, Scientists
•
•
C7
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
Permeability is moderate in the Badin soil. Available water capacity is low or moderate. The
shrink-swell potential is moderate. The hazard of erosion is moderate in bare or unprotected
areas. Flat slate fragments on the surface helps to control erosion. The depth to weathered
bedrock ranges from 20 to 40 inches. The depth to hard, fractured slate bedrock is greater
than 40 inches. This map unit is used mainly for cropland, pasture and woodland.
An area of Badin channery silty clay loam, 2 to 8 percent, eroded (map symbol - BdC2) is
present along the lower Enhancement Level 1 mainstem reach on Davis Branch. The soil
taxonomy is essentially identical to the BaB map unit described in the preceding paragraph.
Some primary differences are the BdC2 map unit is poorly suited to cultivated crops because
of slope constraints and the eroded surface layer. The hazard of further erosion is very severe.
Weathered, fractured slate bedrock is encountered at a depth of about 29 inches. Hard,
fractured slate bedrock is encountered at a depth of about 41 inches. The following
photograph, taken on April 15, 2008 looking upstream on Davis Branch mainstem
Enhancement Level 1 reach, shows the erodible nature of the Badin, BdC2 soil pedon on site,
with streambank sloughing in the foreground and vertical, denuded streambanks upstream
attributed to cattle intrusion.
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Goldston-Badin complex soils (map symbols - GsB and GsQ, 2 to 8 and 8 to 15 percent
slopes, respectively, are the mapped units on UT-1. GsB soils are mapped along the upper
third of the project reach. GsC soils are mapped to the confluence of UT-1 with Davis Branch
mainstem.
The GsB component of the mapped unit consists mainly of shallow and moderately deep,
well drained to excessively drained, undulating Goldston and Badin soils on ridges in the
uplands. The topography is highly dissected by intermittent drainageways. The unit is about
45 percent Goldston soil and about 40 percent Badin soil. The two soils occur as areas so
intricately mixed that mapping them separately at the selected scale in not practical.
Individual areas are irregular in shape and range from 5 to more than 100 acres in size.
Typically, the surface layer of the Goldston soil is brown very channery silt loam 5 inches
thick. The subsoil is light yellow brown very channery silt loam 11 inches thick. Weathered,
fractured slate bedrock is typically encountered at a depth of 27 inches. In some places
Evans, Mechwart, Hambleton & Tilton, Inc. Page 13
Engineers, Surveyors, Planners, Scientists
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
bedrock is exposed at ground surface, resulting in narrow, scattered bands of weathered slate
outcrops. In other areas, flagstones (flat slabs of slate) are in and on the surface layer.
Permeability is moderately rapid in the Goldston soil. Available water capacity is low. The
hazard of erosion is moderate in bare or unprotected areas. Flat slate fragments on the surface
create a "mulch effect" that helps to hold water in the soil and helps to control erosion. The
depth to weathered bedrock ranges from 10 to 20 inches. The depth to hard, fractured slate
bedrock ranges from 20 to 40 inches.
The Badin soil is well drained. Typically, the surface layer is brown channery silt loam 7
inches thick. The subsoil is 21 inches thick. In the upper part, it is red silty clay. In the lower
part, it is red channery silty clay loam that has yellow and strong brown mottles. Weathered,
fractured slate bedrock is encountered at a depth of about 28 inches. Hard, fractured slate
bedrock is at a depth of about 41 inches. In some eroded areas where the upper part of the
subsoil has been mixed with the surface soil by plowing, the surface layer is reddish brown
channery silty clay loam. Permeability is moderate in the Badin soil. Available water capacity
is low or moderate. The shrink-swell potential is moderate. The hazard of erosion is moderate
in bare or unprotected areas. Flat slate fragments on the surface helps to control erosion. The
depth to weathered bedrock ranges from 20 to 40 inches. The depth to hard, fractured slate
bedrock is greater than 40 inches. This map unit is used mainly for cropland, pasture and
woodland.
•
The GsB component of Goldston-Badin complex, 8 to 15 percent slopes is mapped along the
lower two-thirds of the UT-1 project reach to its confluence with Davis Branch. The GsB
mapped soil unit consists mainly of shallow and moderately deep, well drained to excessively
drained, undulating Goldston and Badin soils on hillside valley slopes, as opposed to the GsC
(2 to 8 percent slopes) soils mapped on ridges in upland areas. The topography is highly
dissected by intermittent drainageways. The unit is about 55 percent Goldston soil and about
30 percent Badin soil. The two soils occur as areas so intricately mixed that mapping them
separately at the selected scale in not practical. Individual areas are irregular in shape and
range from 4 to more than 25 acres in size.
The Goldston soil is well drained to excessively drained and is shallow over bedrock.
Typically, the surface layer of the Goldston soil is brown very channery silt loam 5 inches
thick. The subsoil is light yellow brown very channery silt loam 11 inches thick. Weathered,
fractured slate bedrock is typically encountered at a depth of 16 inches. Hard, fractured slate
bedrock is encountered at approximately 27 inches below ground surface In some places
bedrock is exposed at ground surface, resulting in narrow, scattered bands of weathered slate
outcrops. In other areas, flagstones are in and on the surface layer. Other than shallower
accumulated soil thickness attributed to hill slope landform geomorphologic processes
associated with steeper land surface slope, as described above, with the GsB component
containing a proportionately higher composition of Goldston soil based on slope position, the
• GsB pedon is otherwise identical to the GsC pedon. The following photograph shows soil
conditions near the mouth of UT-1, partially obscured to vegetation on April 15, 2008,
characteristic of the onsite GsB soil pedon section.
Evans, Mechwart, Hambleton & Tilton, Inc. Page 14
Engineers, Surveyors, Planners, Scientists

ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tribzrtarv
EEP Contract # D06054-F
,_
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•
•
The following block diagram, from the cited Soil Survey of Union County, is representative
of the occurrence of mapped Goldston-Badin-Cid soils on site.
Evans, Mechwart, Hambleton & Tilton, Inc. Page 15
Engineers, Surveyors, Planners, Scientists
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
The drainage area tributary to the downstream limits of the project on Davis Branch
mainstem is 0.3352 square miles or 214.5 acres. UT1 has a contribution drainage area of
0.0721 square miles (46.1 acres). The project contribution drainage areas watershed map is
presented on Figure 4. Drainage areas for the project reaches are summarized in Table 1.
TABLE 1
Drainage Areas
Project Number D06054-F (Davis Branch and Unnamed Tributary)
Reach Drainage Area (Acres)
Davis Branch Mainstem (downstream
project limit) 214.5
UT1 to Davis Branch* 46.1
Total 214.5
*UT1 drainage areas is included in the total contribution drainage area for the Davis Branch
stream restoration project. Refer to Figure 4 for delineation of project sub-watershed
drainage areas.
1.2 Pre-Restoration Existiniz Conditions
• Davis Branch Impaired Mainstem - Priority Level VII Restoration Reach
The stable, natural channel form for the Davis Branch mainstem restoration reach is Rosgen
E4/1 stream type, based on a detailed Rosgen Level III quantitative and qualitative analysis of
stable reference reach conditions on August 8-9, 2006. The reference reach is located
downstream from the site, beginning at the outlet end of the culvert carrying Davis Branch
under Olive Branch Road in a northwesterly direction to the confluence of Davis Branch with
Gourdvine Creek as shown on Figure 5. Detailed geomorphologic surveys were conducted
along representative segments of each of the impaired project reaches on July 17, 2007.
A number of anthropogenic factors impacted the stream channel and riparian corridor along
the impaired upper mainstem restoration reach, resulting in its pre-restoration unstable,
moderately incised and braided condition. Bank height ratios (BHR) calculated at impaired
pool cross-section 14+87.29 and impaired riffle cross-section 16+50.79, located 706 feet and
870 feet downstream from the top of the mainstem preservation reach on the Griffin property,
are 1.38 and 1.41, respectively (BHR = Low Bank HeightBankfull Maximum Depth). Deep
channel incision was attributed to uncontrolled cattle intrusion (herbaceous groundcover
grazing, shrub vegetation browsing and streambank hoof shear) resulting in a denuded
riparian landscape and destabilized, eroding streambanks. Multiple thread channels, created
by breaches that rerouted the mainstem channel around woody debris jams (avulsions) were
present at a number of locations throughout the reach. (Degree of Channel Incision, River
• Stability Field Guide, David L. Rosgen, Ph.D., P.H. and Hilton Lee Silvey, 2008).
Evans, Mechwart, Hambleton & Tilton, Inc. Page 16
Engineers, Surveyors, Planners, Scientists
•
U

ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F

a

A - Impaired Pool Goss-Section
- 14+87.29, facing upstream, taken
K - during the drought of 2007
r,; ?. ?l,It 1 1? J ,77
Evans, Mechwart, Hambleton & Tilton, Inc.
Engineers, Surveyors, Planners, Scientists
Page 17
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
C?
•
In its pre-existing impaired state, upper Davis Branch was transitioning from E4/1 channel
dimensions (i.e., width/depth ratio < 12; entrenchment ratio > 2.2) to a multiple thread
Rosgen DA4/1 (i.e., width/depth ratio > 40; entrenchment ratio > 2.2) stream type albeit
Evans, Mechwart, Hambleton & Tilton, Inc. Page 18
Engineers, Surveyors, Planners, Scientists
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
•
under incised conditions along the reach. In addition to cattle intrusion, channelization
(impaired conditions sinuosity = 1.12), and an average channel slope of 1.58 percent
increased critical shear stress acting on the streambed and banks during bankfull flows (Qbkf
= 24.8 cfs with a mean velocity of 5.26 ft/sec under impaired conditions) and greater flows.
The following impaired conditions cross-section 18+42.50 graphically shows the multi-
thread, braided stream channels characteristic of Davis Branch prior to restoration.
Braided XS 18+42.50 - Impaired Restoration Reach - Mainstem
o Ground Points ® Bankfull Indicators V Water Surface Points
Nbkf = 11.6 Dbkf = .91 Nbkf - 10.5
•
E
Table 2a provides baseline morphologic and hydraulic summaries for regional curve,
reference reach, existing, proposed and As-Built channel dimension, pattern, profile and
substrate, along with additional reach parameters for upper Davis Branch. The following
screenshot from RiverMorph v. 4.1.1, shows impaired project reach Rosgen stream channel
classification, dominant substrate materials readily available to the stream, geomorphologic
and hydraulic conditions on the Davis Branch mainstem restoration reach. The impaired
mainstem restoration reach longitudinal profile is presented following the Rosgen
Classification screen capture. Supporting impaired conditions documentation is included with
the information in Appendix 3 of the Davis Branch and Unnamed Tributary Restoration Plan
(EMH&T, June 2008).
Evans, Mechwart, Hambleton & Tilton, Inc. Page 19
Engineers, Surveyors, Planners, Scientists
•
E
•
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F

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Evans, Mechwart, Hambleton & Tilton, Inc. Page 20
Engineers, Surveyors, Planners, Scientists
•
•
•
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
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Evans, Mechwart, Hambleton & Tilton, Inc.
Engineers, Surveyors, Planners, Scientists
Page 21
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
0 Davis Branch Enhancement Level I Reach
The stable, natural channel form for the Davis Branch mainstem El reach is a Rosgen E3/lb
stream type based on a detailed Rosgen Level III, quantitative analysis of stable reference
reach boundary conditions on August 8-9, 2006. A detailed geomorphologic survey on the
impaired project reach was conducted on July 17, 2007.
A number of anthropogenic factors impacted the stream channel and riparian corridor along
the impaired lower mainstem El reach, resulting in its pre-restoration channelized, deeply
incised, and eroding, unstable streambanks. Bank height ratios calculated at impaired riffle
cross-section 32+45.24 and impaired pool cross-section 33+49.25, located 85.3 and 187.5
feet downstream from the former confluence of UT I with the mainstem, were 1.58 and 1.86,
respectively. Deep channel incision resulted from steep channel gradient (2.16 percent or
0.0216 ft/ft), linear channel alignment (channel sinuosity = 1.06) mean bankfull flow velocity
approaching 5.5 ft/sec, high shear velocity (u* = 0.93 ft/sec), where u* _ (gdS) 0.5 [g =
gravitational acceleration = 31.74 ft/sect, d = mean depth (ft) and S = channel slope (ft/ft)],
extremely high nearbank critical shear stress (ic = 1.48 Ibs/ft2 ), where ic = 7RS [y = specific
weight of water = 62.4 lbs/ft3, R = hydraulic radius (ft) and S = channel slope (ft/ft)]. In
addition to unstable channel hydraulics and morphology, uncontrolled cattle intrusion (hoof
shear streambank destabilization and vegetative denuding) exacerbated bank and streambed
• erosion. The cumulative effect of these factors resulted in nearly 5 feet high, vertical eroding
streambanks on the El Davis Branch mainstem reach.
Priority Level IM restoration approach was initially proposed as the preferred mitigation
approach to restore stable boundary conditions on the lower mainstem reach. Based on a field
meeting held on April 15, 2008 between EEP and EMH&T, during the design phase of the
project, the mitigation approach was modified from full-scale restoration Enhancement Level
I restoration along the final 1,289 l.f. Davis Branch mainstem reach, under which only profile
and channel dimension would be restored. The design approach included sizing the channel
based on reference reach boundary conditions and the construction of riffles and step-pools to
dissipate energy and reduce bankfull flow velocities. EEP approved Priority Level IM offline
restoration approach for the 1,562 l.f. impaired mainstem reach located in a wooded corridor
immediately upstream from the El 1,289 l.f. mainstem reach located in an open meadow.
Differential level survey cross-sections plots and impaired conditions photographs taken at
the line of section that follow, were taken during the impaired conditions geomorphologic
survey on August 17, 2007.
•
Evans, Mechwart, Hambleton & Tilton, Inc. Page 22
Engineers, Surveyors, Planners, Scientists
•
C?
•
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
Davis Branch Impaired Riffle XS 32+45.24 DLS & TSS - 07/1712007
O G-nd Points 4 Ba Wulf Ind-ton V W.i'Surface Paint
YDkF 9.78 DDNF - 1.27 9DkF - 11.2
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0 10 20 30 40 50 60 70 80 90 100 1t0 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300
Horizontal Distance (ft)
Evans, Mechwart, Hambleton & Tilton, Inc.
Engineers, Surveyors, Planners, Scientists
Page 23
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
E
Davis Branch Impaired Pool XS 33+49.25 DLS & TSS - 07117/2007
O Ground Points ® BanKull Wd,cators ? water surface P-t,
Dhkf - 1D.tl DDkf - 1.4 Dbkf - 15.7
•
•
Evans, Mechwart, Hambleton & Tilton, Inc.
Engineers, Surveyors, Planners, Scientists
Page 24
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
is With a linear channel sinuosity of 1.06, an average profile slope of 2.16 percent, verified
bankfull discharge of 45.5 cubic feet per second, and mean bankfull velocity approaching 5.5
feet per second, the channel had incised (degraded) to bedrock. Without stable pattern to
decrease velocity head, near-bank shear stress, or shear velocity, the impaired channel
compensated by eroding its vertically and laterally confined streambanks, resulting in an
over-widened, over-deepened channel with unstable width/depth relationships and high
streambank erosion rates.
Under reference reach boundary conditions downstream on Davis Branch, where Rosgen
stream type, width/depth, pool to pool spacings, riffle lengths, riffle slopes, average profile
slope, channel dimensions and pattern relationships are within normal ranges for the Carolina
Slate Belt ecologic, geologic and physiographic region, the streambed and banks are
inherently stable. Table 2b presents baseline geomorphologic and hydraulic summary data
from the North Carolina Rural Piedmont Regional Curve dataset, stratified by Rosgen E
stream type regression analysis, the Davis Branch Reference Reach, existing, proposed and
As-Built channel dimension, profile and substrate, and hydraulic parameters for mainstem El
project reach.
The following longitudinal profile, analyzed using RiverMorph v. 4.1.1, shows the impaired
El mainstem project reach, with locations of impaired conditions cross-sections shown on the
profile. Following the impaired conditions longitudinal profile, the impaired conditions
Rosgen stream channel classification, dominant substrate materials, geomorphologic
parameters and hydraulic geometries from representative impaired riffle cross-section
32+45.24, surveyed in the field on July 17, 2007 are presented. Supporting impaired
conditions geomorphologic and hydraulic assessment documentation is included with the
information in Appendix 3 of the Davis Branch and Unnamed Tributary Restoration Plan
(EMH&T, June 2008) incorporated herein by reference.
•
Evans, Mechwart, Hambleton & Tilton, Inc. Page 25
Engineers, Surveyors, Planners, Scientists
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
•

EEP Contract # D06054-F

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Evans, Mechwart, Hambleton & Tilton, Inc.
Engineers, Surveyors, Planners, Scientists
Page 26
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
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Evans, Mechwart, Hambleton & Tilton, Inc.
Engineers, Survevors, Planners, Scientists
Page 27
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
• Davis Branch UT1
The stable, natural channel form for the Davis Branch UT1 restoration reach is a Rosgen
E4/lb stream type, based on a detailed Rosgen Level III, quantitative analysis of a stable
reference reach conditions on August 8-9, 2006 combined with a detailed geomorphologic
survey along the final 240 linear feet of the impaired project reach, conducted on July 17,
2007.
A number of anthropogenic factors impacted the stream channel and riparian corridor along
the impaired UT 1 reach (existing conditions profile station 0+00.00 to 7+29.60) resulting in
its pre-restoration channelized, entrenched and deeply incised condition. Bank height ratios
were calculated at impaired profile stations 5+62.69, 6+13.69 and 7+24.30 corresponding to
representative existing conditions riffle cross-section locations. Low bank heights ranged
from 1.78 to 3.45 feet, with a mean of 2.50 feet. Corresponding bank height ratios were 2.47,
3.67 and 2.32, respectively, with a mean BHR of 2.82.
The extreme degree of channel incision leading to entrenchment was attributed to steep
profile gradient (2.3 percent or 0.023 ft/ft), linear channel alignment (sinuosity = 1.09), high
bankfull mean velocity (6.58 ft/sec), high shear velocity (u* = 0.68 ft/sec), high near-bank
critical shear stress (ic = 0.85 lbs/ft2) and uncontrolled cattle intrusion (hoof shear streambank
destabilization, vegetative denuding resulting in streambank failure, erosion and
degradation). The cumulative effects of these impacts resulted in nearly 4 feet high, vertical,
eroding streambanks on the impaired UT I reach. Impaired pool cross-section 6+55.69 and
riffle cross-section 5+62.69, located 71 and 164 feet upstream from the pre-restoration
confluence of UT1 and the Davis Branch El mainstem reach, respectively, are presented
below. Photographs at the line of section were taken during the impaired conditions
geomorphologic survey on July 17, 2007 under severe drought conditions. The degree of
channel incision increased from the top to the bottom of the reach as shown by the best fit
trendlines through thalweg, bankfull and low bank elevation points plotted on the impaired
conditions longitudinal profile, presented following the impaired conditions riffle and pool
cross-section plots and photographs. A screenshot from RiverMorph v. 4.1.1, showing
impaired UT I project reach Rosgen stream type classification, valley type, dominant
substrate materials, together with geomorphologic and hydraulic parameters is presented
following the impaired conditions longitudinal profile.
In its pre-existing impaired state, UT1 was transitioning from E4/lb to C4/lb channel
morphology, based on dimensions measured at impaired reach riffle cross-sections, albeit
under incised conditions. The transition from E to C channel morphology occurs at below
impaired profile station 3+16. Table 2c provides baseline geomorphologic and hydraulic
summary data for regional curve, reference reach, impaired, proposed and As-Built channel
dimensions, pattern and profile, along with addition reach parameters.
•
Evans, Mechwart, Hambleton & Tilton, Inc. Page 28
Engineers, Surveyors, Planners, Scientists

•
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
Davis Branch UT1 - Impaired Riffle XS 5+62.69 - 07/17/2007
? 0
•
Horizontal Distance (ft)
-fsl
UT1 Impaired Riffle Coss-
Section 5+62.69, looking
downstream. Hoof shear
streambank destabilization
and herbaceous and shrub
vegetative denuding are
evident (July 17, 2007).
v

Evans, Mechwart, Hambleton & Tilton, Inc.
Engineers, Surveyors, Planners, Scientists
Page 29
•
•
•
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
Davis Branch UT1 - Impaired Pool XS 6+55.69
O Ground Points ? DanMull Indicators ? water surface Points
Mbkf 5.79 Dbkf - .96 Rbkf - 5.54
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0 10 20 30 40 50 60 70 80 90 100 iiD 110 730 160 750 160 170 180 190 200
Horizontal Distance (ft)
Evans, Mechwart, Hambleton & Tilton, Inc.
Engineers, Surveyors, Planners, Scientists
Page 30
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
•
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Evans, Mechwart, Hambleton & Tilton, Inc.
Engineers, Surveyors, Planners, Scientists
Page 31
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
•

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Evans, Mechwart, Hambleton & Tilton, Inc. Page 32
Engineers, Surveyors, Planners, Scientists
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
is 2.0 RESTORATION SUMMARY
2.1 Mitigation Goals and Objectives
As discussed in the Restoration Plan for Davis Branch and an associated unnamed tributary
(UT1), the mitigation goals and objectives for the project involved restoring stable physical and
biological function of the project streams beyond pre-restoration (impaired) conditions. Impaired
conditions consisted of channelized, eroding, incised and entrenched stream channels. Nutrient
and sediment loading from agricultural runoff, together with vegetative denuding and
destabilized streambanks associated with hoof shear resulting from uncontrolled cattle access
was evident. The specific mitigation goals and objectives proposed and achieved for the project
are listed below.
• Stable stream channels with features inherent of ecologically diverse environments, with
appropriate streambed features including appropriately spaced pool and riffle sequences,
and riparian corridors planted with a diversity of indigenous vegetation.
• Superimposed reference reach boundary conditions on the impaired project reaches in the
restoration design and construction of improvements.
• Constructed stream channels with the appropriate geometry and gradient to convey
bankfull flows while entraining suspended sediment (wash load) and bedload materials
. readily available to the streams.
• Created an improved connection between the bankfull channels and their floodprone
areas, with stable channel geometries, protective vegetation and jute coir fabric to prevent
erosion.
• Minimized future land use impacts to project stream reaches by conveying a perpetual,
restrictive conservation easement to the State of North Carolina, including stream
corridor protection via livestock exclusion fencing at the surveyed and recorded
conservation easement boundaries, with gates at the edge of the riparian corridor on river
right and left at reserved conservation easement crossings adjacent to active pasture land.
The restoration of Davis Branch mainstem and UT1 met the project goals and objectives set forth
in the restoration plan, by providing desired habitat and stability features required to enhance and
provide long-term ecologic health for the project reaches. More specifically, the completed
restoration project has accomplished the enhancements listed below.
Davis Branch Mainstem:
• Reversed the effects of channelization using a Priority Level ULevel R (PIM) and
Enhancement Level I (EI) restoration approaches; restoration increased the average
width/depth ratio from 9.13 to 19.34 on the PIM reach and from 6.91 to 27.02 on the
EI reach.
• Restored natural pattern to the channel alignment, increasing sinuosity from 1.12 to
1.29 on the PI/H reach, while maintaining a stable relationship between the valley
slope and bankfull slope (the bankfull slope was steeper than the valley slope prior to
restoration and is now less than the valley slope post-restoration). Stable pattern,
Evans, Mechwart, Hambleton & Tilton, Inc. Page 33
Engineers, Surveyors, Planners, Scientists
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
profile and dimension were restored based on extrapolation from reference reach
boundary conditions. On the mainstem El reach, profile and dimension were restored
based upon reference reach boundary conditions.
• Stabilized eroding streambanks by constructing appropriately sized channels with
stable streambank slopes, built using a combination of embedded stone, grade
control structures, topsoil, herbaceous seeding, mulch, natural fabrics and hearty
vegetative live branch (3-foot spacings), bareroot (4-foot spacings) and 1-gallon tree
(100-foot spacings) plantings.
• The average Bank Height Ratio was decreased from 1.41 to 1.00 on the PIM reach
and 1.86 to 1.00 on the El reach, respectively (i.e., extremely incised to stable).
• Restored connection between the bankfull channel and the adjacent floodprone area
by raising the bankfull channel to the elevation of the adjacent floodplain. The
restored mainstem PIM and El reach entrenchment ratios range from 3.75 to 12.30
(stable).
• Created instream aquatic habitat features, including appropriately spaced pool and
riffle sequences, and a stable transition of the mainstem reach El thalweg to the
invert of the existing channel at the bottom of the mainstem project reach.
• Revegetated the riparian corridor with indigenous canopy, mid-story, shrub and
herbaceous ground cover species, and preserved existing forested riparian corridors
where present.
• • Protected the riparian corridor by placing livestock exclusion fencing at the edge of
the perpetual, recorded conservation easement boundary.
Unnamed Tributary 1(UTl):
• Reversed the effects of channelization through a combination of Enhancement Level
11 (Elf) and Priority Level I (PI) restoration techniques. The average width/depth
ratio of the restored UT1 project reach is 29.13. Stable dimension and grade control
was restored on the EH reach (as-built profile station 0+00 to 3+96). Stable pattern,
profile and dimension were restored on the PI reach (as-built profile station 3+96 to
8+54) based on extrapolation from reference reach boundary conditions.
• Restored stable channel pattern on the PI reach, increasing sinuosity from 1.09 to
1.37.
• Stabilized eroding streambanks by providing appropriately sized channels with stable
streambank slopes. The average Bank Height Ratio has been reduced from 2.82 to
1.00 (extremely incised to stable).
• Improved the connection between the restored stream channel and the adjacent
floodprone area by raising the bankfull channel to the elevation of the adjacent
floodplain. The completed restoration increased the average entrenchment ratio from
3.63 to 4.38.
• Created stable channel dimensions, substrate and grade control structures (rock sills)
on the El reach; Created stable pattern, profile and dimension, including
appropriately spaced riffle, run, pool and glide sequences, together with a stable
Evans, Mechwart, Hambleton & Tilton, Inc. Page 34
Engineers, Surveyors, Planners, Scientists
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
•
•
•
transition of the UT1 PI reach thalweg at its confluence with the Davis Branch
Mainstem.
• Revegetated the riparian corridor with indigenous canopy, mid-story, shrub and
herbaceous ground cover, preserved existing forested riparian corridors where
present.
• Protected the riparian corridor by placing livestock exclusion fencing at the edge of
the perpetual, recorded conservation easement boundary.
2.2 Restoration Approach
Engineering Field Reconnaissance
EMH&T scientists and engineers mobilized to the site on July 17, 2007 to assess the impaired
project reaches. The following sections describe the results of the impaired conditions field
assessment. Representative stream profiles >_ 20 bankfull widths were surveyed using differential
leveling techniques on each of the project reaches. Representative riffle and pool cross-sections
were surveyed on each reach and riffle and pool streambed particle distributions were collected
following standard NC EEP protocols. The following sections discuss, in detail, the results from
engineering field reconnaissance, by project stream reach.
Project Mitigation Approaches
The restoration approaches for the project were implemented to return the impaired streams to a
more natural condition that it is ecologically productive, aesthetically appealing, physically
stable, and valuable from a conservation perspective. Project restoration goals and objectives
were achieved utilizing an off-line, Priority Level I/Level 11 mitigation approach, restoring stable
pattern, profile and dimension along the upper 1,799 linear feet (profile stations 7+81.31 to
25+79.02) on the Davis Branch mainstem and the final 459 linear feet (profile stations 3+95.76
to 8+54.91) on UT L The mitigation approach restored connection of the vertically and laterally
confined incised and entrenched stream reaches with their floodplains.
Channel profile and dimension was restored on the mainstem EI reach (profile stations 25+79.02
to 38+67.53) to stabilize existing over-widened and incised channel conditions. Dimension was
restored on the upper 396 linear feet (profile stations 0+00.00 to 3+95.76) Ell reach on UT I, with
three grade control structures (rock sills) constructed approximately at profile stations 0+00,
2+00 and 3+00, together with placement of appropriately sized substrate material in the channel
to reduce critical shear stress (0.56 lbs/ft2) in the near-bank region while maintaining bankfull
flow velocity (2.74 ft/sec) and critical depth (0.95 ft) required to entrain coarse gravel (D50
particle size = 28.8 mm), based on analysis of channel hydraulics (entrainable particle size = 32.8
mm) and analysis of a particle distribution sample (n = 71) collected from the streambed at
monumented riffle cross-section 8 (Riffle XS-8) at UT1 As-Built profile station 2+00.10.
Channel reinforcement materials were used in high near-bank shear stress regions (i.e., along
outside meander bends). Reinforcement materials consist of a combination of rock toe channel
Evans, Mechwart, Hambleton & Tilton, Inc.
Engineers, Surveyors, Planners, Scientists
Page 35
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
protection, temporary seeding and mulching, application of coconut fiber geotextile fabric, live
branch plantings and revetment of streambanks and the riparian corridor.
•
C7
Existing forested riparian corridors were preserved along the realigned Davis Branch mainstem
and UT I to enhance streambank stability, provide sediment and nutrient storage, and enhance
terrestrial and aquatic habitat. Portions of the existing corridor that was disturbed during project-
related construction was planted on April 6, 2009. Denuded areas within the limits of the project
conservation easement have been fully planted to reestablish a native riparian corridor. The
stream corridors are protected by livestock exclusion fencing placed at the edge of the
conservation easement boundary.
2.3 Bankfull Verification
For the project stream reaches, bankfull discharge was evaluated through quantitative analysis of
stable reference reach boundary conditions and comparison of predicted bankfull discharge
through a stable, surveyed riffle cross-section, located 43 feet upstream from the confluence of
Davis Branch with Gourdvine Creek, as shown on Figure 4. The contribution drainage area for
the Davis Branch Reference Reach is 365.55 acres or 0.5712 square mile. Discharge versus
drainage area relationships for the reference reach riffle cross-section were compared to
published Bankfull Hydraulic Geometry Relationships for North Carolina Streams (Rural
Piedmont) regional curve dataset. Through this analysis, it was determined the rural Piedmont
regional curves underestimates bankfull discharge and geometric relationships for project stream
reaches.
The Bankfull Hydraulic Geometry Relationships for North Carolina Streams (Rural Piedmont)
power function regression equation for bankfull discharge is:
Qbkf = 66.57 x Aµ,089 (R2 = 0.97)
where Qbkf = bankfull discharge (cfs) and AW = watershed drainage area (mi2). Inputting the
Davis Branch Reference Reach drainage area (0.5712 mi) into the power function regression
equation yields the following result:
Qbkf = 66.57 x 0.5712089 = 40.4 cfs
To validate bankfull discharge for the project reaches, the Bankfull Hydraulic Geometry
Relationships for North Carolina Streams (Rural Piedmont) dataset was stratified by E stream
type using the regional curve data editor in RiverMorph® v.4.3. The resulting Log-Pearson Type
III distributions and regression analysis from the stratified regional curve dataset yielded the
following power function regression equations for bankfull discharge, bankfull cross-sectional
area, mean depth and width is shown on the following page. The empirical relationships
(predicted values) and the quantified relationships (measured values) from the Level III Davis
Branch Reference Reach field study are presented in bold, where AW = 0.5712 mil.
Evans, Mechwart, Hambleton & Tilton, Inc.
Engineers, Surveyors, Planners, Scientists
Page 36
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
•
Qbkf = 111.28 x A,, 0.5878 (R 2 _
- 0.94) Qbld = 80.0 cfs (predicted) 77.6 cfs (quantified)
Abkf = 22.57 x A,,,0.6317 (RZ = 0.88) Abkf =15.85 sq ft (predicted) 15.65 sq ft (quantified)
Dbkf = 1.53 x A,,,0.3206 (R2 = 0.90) Dbkf =1.35 ft (predicted) 1.21 ft (quantified)
Wbkf = 14.02 x Aw0.3188 (R2 = 0.94) Wbkf =11.77 ft (predicted) 12.91 ft (quantified)
The calculated discharge, using carefully delineated reference reach drainage area, quantified
reference bankfull riffle geometry, profile slope, and bed roughness yielded a bankfull discharge
of 77.6 cubic feet per second (cfs). The following Discharge versus Drainage Area, Rural
Piedmont Regional Curve, stratified by Rosgen E stream type analysis predicts Qbkf = 80.0 cfs
and validates quantified bankfull discharge calculations for the Davis Branch Reference Reach.
Davis Discharge
low
1000
? '
• NC Pied E Type Rey CIIMB
100
Davis Branch Reference Reach
? Drainage 0,5712
Discharge :11 cfs
10
0.1 1 10 100
? 1 1
Since the quantitatively derived bankfull discharge of 77.6 cfs, based on carefully measured field
parameters, closely matches the empirical relationships between drainage area and bankfull
discharge estimates from the stratified Rosgen E stream type Rural Piedmont Regional Curve
dataset, the quantitatively derived bankfull discharge was carried forward into the design,
proportionally adjusted for individual project reach drainage areas. Refer to Table 2a through
Evans, Mechwart, Hambleton & Tilton, Inc. Page 37
Engineers, Surveyors, Planners, Scientists
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
• Table 2c for reach specific estimates of bankfull discharge and hydraulic geometries from the
stratified Rural Piedmont regional curve dataset, reference reach, pre-existing, design and as-built
conditions.
Channel Morphology
Landform morphology along the Davis Branch mainstem and UT1 is Rosgen Valley Type VIII
and Valley Type II, respectively. The pre-restoration Davis Branch mainstem restoration reach,
mainstem EI reach and UT1 restoration reach were a deeply incised E4/lb -+ D4/lb, E3/lb and
E4/lb --> C4/lb Rosgen stream types, respectively. The restoration goal to reconnect project
stream reaches with their adjacent floodplains and re-establish stable pattern, profile and
dimension consistent with reference reach boundary conditions was achieved. The as-built Davis
Branch mainstem restoration reach, mainstem El reach and the UT 1 restoration reach are Rosgen
C4/1, C3/lb and C4/1 stream types, respectively, with areas of bedrock control. Summary
geomorphologic and hydraulic summary data from the Bankfull Hydraulic Geometry
Relationships for North Carolina Streams (Rural Piedmont) regional curves, stratified by Rosgen
E stream types, Davis Branch Reference Reach, Pre-Existing, Design and As-Built conditions for
the Davis Branch mainstem and UTl stream reaches are presented in Table 2a through Table 2c.
is
•
Evans, Mechwart, Hambleton & Tilton, Inc. Page 38
Engineers, Surveyors, Planners, Scientists
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W W
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F

2.4 As-Built Channel Stability Assessment
Davis Branch Mainstem PUII Reach
Prior to restoration, the stream's high degree of channel incision (BHR range 1.38 - 1.41), low
sinuosity (K = 1.12), denuded and destabilized streambanks, relatively steep average profile
slope (0.0158 ft/ft) had resulted in a deeply incised, unstable channel with a high sediment
supply. The incised vertical to undercut streambanks, accelerated streambank erosion. Utilizing
the near bank stress bank erosion hazard index (BEHI) algorithm in RiverMorph® v.4.1.1, it is
estimated 31 cubic yards per year (or 40 tons per year) of sediment was being eroded from the
unstable, vertical to undercut streambanks along the upper mainstem impaired reach. Post
restoration bank erosion rates are presented in Table 3a. Individual BEHI study streambank input
data, assumptions and output data are presented in Appendix D.
Davis Branch El Reach
Prior to restoration, the stream's high degree of channel incision (BHR range 1.58 - 1.86), low
sinuosity (K = 1.06), denuded and destabilized streambanks, relatively steep average profile
slope (0.0216 ft/ft) had resulted in a deeply incised, unstable channel with a high sediment
supply. The incised vertical to undercut streambanks, accelerated streambank erosion. Utilizing
• the near bank stress bank erosion hazard index (BEHI) algorithm in RiverMorph0 v.4.1.1, it is
estimated 46 cubic yards per year (or 56 tons per year) of sediment was being eroded from the
unstable, vertical to undercut streambanks along the lower mainstem impaired reach. Post
restoration bank erosion rates are presented in Table 3a. Individual BEHI study streambank input
data, assumptions and output data are presented in Appendix D.
•
Evans, Mechwart, Hambleton & Tilton, Inc.
Engineers, Surveyors, Planners, Scientists
Page 43
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributarv
EEP Contract # D06054-F
•
Table 3a: Davis Branch Mainstem "As-Built" Predicted Bank Erosion Rates
is
•
Davis Branch Mainstem Reach
Bank Identification Summary
Bank Name
1 XS7 Riffle El BEHI
2 XS6 Pool El BEHI
3 XS5 Riffle El BEHI
4 XS 1 Riffle PlJU BEHI
5 XS2 Pool PIM BEHI
6 XS3 Riffle PUII BEHI
7 XS4 Pool PLO BEHI

Davis Branch Mainstem El & P UII Restoration Reach: Pred icted Annual B ank Erosion Rates

Bank BEHI
Numeric
Rating BEHI
Adjective
Rating NBS
Adjective
Ratin
Length
ft
Loss
;cu ds/yr
Loss
tons/ r
1 18.1 Low Very Low 451 0.37 0.48
2 27.1 Moderate Very Low 387 2.05 2.67
3 16.7 Low Very Low 451 0.35 0.45
4 15.2 Low Very Low 450 0.25 0.33
5 19.7 Low Very Low 449 0.6 0.78
6 18.4 Low Very Low 450 0.46 0.6
7 20.3 Moderate Very Low 450 1.57 2.04
Totals 3,088 5.65 7.35
Total Reac h Length = 3,088 l.f. Total Loss per foot of Reach = 0.0024 tons/yr
Note: PI/11 estimated total sediment loss per foot of reach = 0.0021 tons/yr/ft = 0.03 ft bank loss/year.
El predicted total sediment loss per foot of reach = 0.0029 tons/yr/ft = 0.04 ft bank loss/year.
Evans, Mechwart, Hambleton & Tilton, Inc.
Engineers, Surveyors, Planners, Scientists
Page 44
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
•
UT 1 Restoration Reach
Prior to, restoration, the stream's extreme degree of channel incision along the final 300 linear
feet (BHR range 2.32 - 3.67), low sinuosity (K = 1.09), denuded and destabilized streambanks,
steep profile slope (0.0230 ft/ft) resulted in a deeply incised, unstable channel with a high
sediment supply. The incised vertical to undercut denuded streambanks, accelerate erosion rates.
Utilizing the near bank stress bank erosion hazard index (BEHI) algorithm in RiverMorph®
v.4.1.1, it is estimated I l cubic yards per year (or 14 tons per year) of sediment was being eroded
from the unstable, vertical to undercut streambanks along the final 300 linear feet of the UTl
impaired reach. Post restoration bank erosion rates are presented in Table 3c through Table 3e.
Individual BEHI study streambank input assumptions and output data are presented in Appendix
D.
Table 3b: Davis Branch UT1 Reach "As-Built" Predicted Bank Erosion Rates
•
Davis Branch UT1
Bank Identification Summary
Bank Name
1 XS8 Riffle ER Reach BEHI
2 XS9 Riffle P1 Reach BEHI
16-
Davis Branch UT1 Enhancement II & Restorat ion Reaches: Predicted Annua l Bank Erosion Rates
BEHI BEHI NBS
Bank Numeric Adjective Adjective Length Loss Loss
Rating Rating Rating ft cu ds/ r tons/ r
1 15.6 Low Very Low 396 0.37 0.48
2 16.0 Low Very Low 459 1.57 2.04
855 0.53 0.69
Totals Total Loss per foot of Reach = 0.0008 tons/yr
Total Reach Length = 8551.f.
_ i_._ir. - n m Fr l.?nU lnce/vaar
Note: Estimated total secalmem loss PCt 1VUL V1 ica?n - -.,,.,-•-- -- -
Channel Stability Summary
Summing the predicted annual streambank erosion rates for each of the project reaches under
impaired conditions, it was estimated the impaired streambanks had the potential to contribute
approximately 88 cubic yards (or 114 tons) of nutrient laden sediment off site into the larger
Davis Branch, Gourdvine Creek and Richardson Creek catchments on an annual basis. Post-
restoration predicted annual streambank erosion rate estimates for the restored project reaches is
7.6 cubic yards (or 9.9 tons) - an estimated net 91.4 percent reduction from pre-restoration
conditions.
Evans, Mechwart, Hambleton & Tilton, Inc. Page 45
Engineers, Surveyors, Planners, Scientists
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tribcttan,
EEP Contract # D06054-F

Table 3c: Davis Branch & UTI "As-Built" Predicted Bank Erosion Rates (Project Summary)
Davis Branch Project Summary
Bank Identification Summary
Bank Name
1 XS7 Riffle MS El BEHI
2 XS6 Pool MS El BEHI
3 XS5 Riffle MS El BEHI
4 XS 1 Riffle MS PUII BEHI
5 XS2 Pool MS PUII BEHI
6 XS3 Riffle MS PUII BEHI
7 XS4 Pool MS PUII BEHI
8 XS8 Riffle UT1 Ell BEHI
9 XS9 Riffle UTI PI BEHI

Davis Branch & UTI Project Summary: Predicted Annu al Bank Erosion Rates

Bank BEHI
Numeric
Rating BEHI
Adjective
Rating NBS
Adjective
Rating
Length
ft
Loss
cu yds/yr
Loss
tons/yr
1 18.1 Low Very Low 451 0.37 0.48
2 27.1 Moderate Very Low 387 2.05 2.67
3 16.7 Low Very Low 451 0.35 0.45
4 15.2 Low Very Low 450 0.25 0.33
5 19.7 Low Very Low 449 0.6 0.78
6 18.4 Low Very Low 450 0.46 0.6
7 20.3 Moderate Very Low 450 1.57 2.04
8 15.6 Low Very Low 396 0.37 0.48
9 16 Low Very Low 459 1.57 2.04
Totals 3,943 7.59 9.87
Total Reach Length = 3,9431.f. Total Loss per foo t of Reach = 0.0025 tons/yr
Note: Estimated total sediment loss per toot of reach = U.0024 tonstyrttt e u.u.i it oanx toss/year.
The consequence of channelization, cattle intrusion, confinement (lateral containment), incision
(vertical containment) major floods, changes in sediment regime, and loss of riparian vegetation
are attributed causes and effects for impaired conditions along the project reaches prior to
restoration. The effects of these anthropogenic changes were accelerated streambank erosion,
channel incision, land loss, aquatic habitat loss, lowering of the water table, land productivity
is reduction and in-stream and downstream sedimentation and nutrient loading.
Evans, Mechwart, Hambleton & Tilton, Inc. Page 46
Engineers, Surveyors, Planners, Scientists
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
As the revegetated riparian corridors canopy, mid-story, shrub, herbaceous and streamside
vegetation matures, intuitively, annual streambank erosion rates should decrease as root mass and
density along the restored stream reaches become more pervasive over time.
Reference Reach Data Collection
For Davis Branch, bankfull discharge was determined through a quantitative assessment and
analysis of reference reach boundary conditions and comparison of predicted bankfull discharge
through a stable riffle cross-section located on the Davis Branch mainstem, 43 feet upstream
from its confluence with Gourdvine Creek. The reference reach is located along the same
geologic structural feature, the Troy Anticlinorium (northwest limb near the axial plane of an
unnamed, northeast-southwest trending syncline), in the same geologic setting, the McManus
Formation (see Geologic Map of the Carolina Slate Belt, Union County, North Carolina
presented on page 9 in Section 1.0), is mapped on the same soil series (Chewacla silt loam,
Goldston soils and Cid channery silt loam), and is located in the same local watershed as the
Davis Branch and Unnamed Tributary restored stream reaches. The reference reach is shown at
watershed scale on Figure 4.
A complete Rosgen Level III watershed assessment and analysis of the reference reach conditions
was conducted during August 8 and 9, 2006. Due to extremely thick riparian vegetation during
. August 2006, it was possible to collect profile and cross-section data only along a relatively short
length of the stable reach. Approximately 118 linear feet of profile, capturing three pool and four
riffle sequences, with one representative riffle and pool cross-section, were surveyed in the field.
Geologic structural controls and lithology, fluvial geomorphologic processes, depositional
materials, climatic influence, riparian vegetation, deposition pattern, debris occurrence, meander
pattern, channel stability rating, sediment supply, streambed stability and width/depth ratio state
were evaluated following Rosgen Level III stream assessment protocols. Visibility was limited in
the field to dense vegetative cover along the Davis Branch Reference Reach; therefore, Union
County orthoimagery (February 2004) was used to verify stream pattern.
A total of 1,129 linear feet of the reach was assessed for each Level III stream state and condition
parameter consistent with a Rosgen Level III methodologies. The assessment included GPS data
spatial analysis to evaluate channel pattern upstream from the surveyed reach, beyond the point
where additional differential level surveying was impracticable and channel pattern could not be
discerned using either standard field measurement techniques or recent aerial imagery.
Calculated bankfull discharge for the surveyed reference reach riffle cross-section, was computed
using hydraulic radius, wetted perimeter, channel slope and a relative roughness (u/u*) method
based on the average protrusion height of the steeply dipping bedrock (Rosgen, 1998).
Additionally, a particle distribution was collected from the large angular cobble deposited along
the reference reach riffle bed.
0 Reference reach survey data, analysis, classification and geomorphologic summary reports for the
Davis Branch Reference Reach are presented in Appendix 3, Davis Branch and Unnamed
Evans, Mechwart, Hambleton & Tilton, Inc. Page 47
Engineers, Surveyors, Planners, Scientists
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
Tributary Restoration Plan, NC EEP Project Number: D06054-F (EMH&T, January 16, 2008).
The Davis Branch Reference Reach morphologic and hydraulic data are summarized in Table 2.
Reference Reach Classification
The reference reach is a Rosgen Valley Type VIII, E3/lb stream type (i.e., E channel
morphology, large cobble substrate with strong bedrock control, profile gradient greater than 2
percent). The reference reach is located within a healthy, deciduous hardwood forested riparian
corridor. The D84 particle size from the stable riffle particle distribution is 140.1 mm and is
consistent with the observed bed thickness and axial splitting planes and observed joint sets in
the folded and deformed slate bedrock.
Reference Reach Discharge
See Section 3.5 for a comprehensive analysis and of bankfull discharge for the Davis Branch
Reference Reach and the Davis Branch and UT1 project reaches. Regional curve, reference
reach, pre-existing, design and as-built bankfull discharge are presented in tabular format in
Table 2.
Channel Morphology
Stream channel morphology data for the Davis Branch reference reach, the Davis Branch
mainstem and UT1 is presented in tabular format on Table 2. The Davis Branch reference reach
is a Rosgen Valley Type VIII, E3/lb stream type.
Channel Stability Assessment
Reference reach channel stability was analyzed using the vertical velocity near-bank stress
method algorithm in RiverMorpho v.4.1.1 and reach streambank observations and channel
morphology from reference reach Pool Cross-Section 1+83, located on Davis Branch 117 feet
upstream from its confluence with Gourdvine Creek. The predicted annual erosion rate estimate
was calculated for the entire 1,129 linear feet of stream evaluated as part of the Rosgen Level III
reference reach study. Based on reference reach conditions, the predicted sediment loss is 3.23
cubic yards or 4.2 tons per year. This equates to 0.0043 tons/year per foot of reach, or two one
hundredths of a foot (0.02 ft) streambank erosion on an annual basis. The near-bank adjective
rating (0.35) is very low for the reference reach, indicating extremely stable channel conditions.
Vegetation
The Davis Branch reference reach flows through a deciduous hardwood forest area, which
provides a wide riparian corridor. The canopy layer is dominated by native tree species including
Plantanus occidentalis (American sycamore), Carya species (hickory), and Acer negundo
(boxelder). The shrub/ sapling and herbaceous understory is extremely thick and provides
Evans, Mechwart, Hambleton & Tilton, Inc. Page 48
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ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributarv
EEP Contract # D06054-F
protection against bank erosion. Species such as Rosa multiflora (multiflora rose),
significant Alnus serrulata (hazel alder), Bignonia capreolata (crossvine), Viola sp. (violet), and
Convolvulus species (bindweed) are present within the understory. This healthy, robust
vegetation and associated root mass along the reference reach riparian corridor, extending
overbank into the channel, is extremely stable and resistant to streambank erosion.
•
2.5 Restoration Summary
A summary of the restored stream lengths, restoration approach and associated SMU credits are
presented in Table 4 below.
Table 4: Pre-Existing Conditions/Post-Construction Summary
Protect Number D06054-F (Davis Branch and Unnamed Tributary 1)
Project Pre-existing Restored Restoration Level Credit Ratio SMUs**
Reach ID length Length*
Davis Branch 781 l.f. 766 IS.* Preservation 5 153
Mainstem
Davis Branch
1,5621.f.
1,799 U.
Priority Level UII
1
1,799
Mainstem Restoration
Davis Branch 1,289 l.f. 1,229 IS.* Enhancement 1.5 819
Mainstem Level I
Restoration
UT1 396 IS. 396 IS. Enhancement 2.5 158
Level II
Restoration
UTl 334 l.f. 459 IS. Priority Level I 1 459
Restoration
Totals 4,649 l.f. 3,388
*Restored lengths exclude permanent conservation eascincin %AU"111r,3.
**Restored Length divided by SMU Credit Ratio
Differences Between Design and As-Built Conditions
The "As-Built" geomorphologic parameters in this report show some notable differences in
comparison to design parameters for the project stream reaches. The detailed Rosgen Level III
reference reach study conducted downstream from the project reaches on Davis Branch shows
stable E-type channel geomorphologic relationships were indicated for both the Davis Branch
mainstem and UT I. In each case the "As-built" reaches have C-type channel geomorphologic and
hydraulic relationships with approximately the same cross-sectional areas proposed in the design.
The detailed assessment of the "As-Built" conditions presented in this mitigation plan show the
restored streams are stable, properly sized and well connected to their floodplains. Additionally,
the "As-Built" project stream reaches meet the mitigation goals and objectives acknowledged as
set forth in the project Restoration Plan.
Evans, Mechwart, Hambleton & Tilton, Inc. Page 49
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ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
Davis Branch Mainstem Restoration Reach
The most notable differences when comparing the "As-Built" geomorphologic conditions to the
proposed design conditions in the Restoration Plan are listed below.
1. The median bankfull width is 25 percent greater than proposed (9.0 ft to 11.3 ft)
2. The median bankfull mean depth is 32 percent less than proposed (0.88 ft to 0.60 ft)
3. The median floodprone width is 25 percent less than proposed (117 ft to 88 ft)
4. The median entrenchment ratio is 35 percent less than proposed (13.1 to 8.5)
5. The median width/depth ratio 47 percent greater than proposed (10.2 to 19.3)
Despite the differences between design and "As-Built" channel morphology, the bankfull cross-
sectional area under design and "As-Built" conditions is similar (7.9 ft2 vs. 7.0 ft2). The
entrenchment ratio is very stable (8.5). The transition from the designed E-type channel to the
"As-Built" C-type channel remains stable and functional from an ecologic enhancement
perspective. Additionally, "As-Built" pattern and profile slope, from the top to the bottom of the
1,799 l.f. mainstem restoration reach, is consistent with proposed conditions in the site
Restoration Plan.
UT 1 Restoration Reach
The most notable differences when comparing the "As-Built" geomorphologic data to the
proposed design conditions in the Restoration Plan are listed below.
1. The median bankfull width is 50 percent greater than proposed (6.2 ft to 12.4ft)
2. The median bankfull mean depth is 40 percent less than proposed (0.72 ft to 0.43 ft)
3. The median entrenchment ratio is 43 percent less than proposed (7.7 to 4.4)
4. The median width/depth ratio is 70 percent greater than proposed (8.6 to 29.1)
Despite these changes between design and "As-Built" conditions, the bankfull cross-sectional
area under design and "As-Built" conditions is similar (4.5 ft2 vs. 5.3 ft2). The entrenchment ratio
is stable (4.4). The median floodprone width is 12 percent greater than proposed (54.1 ft vs. 47.4
ft). The transition from the designed E-type channel to the "As-Built" C-type channel remains
stable and functional from an ecologic enhancement perspective. "As-Built" pattern and profile
slope, from the top to the bottom of the 459 l.f. UT1 restoration reach, is consistent with
proposed conditions in the site Restoration Plan.
r?
?J
Evans, Mechwart, Hambleton & Tilton, Inc. Page 50
Engineers, Surveyors, Planners, Scientists
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributarw
EEP Contract # D06054-F
• 3.0 MONITORING PLAN
To demonstrate the success of the project, three forms of monitoring will be performed: (1) photo
documentation; (2) ecological function assessment; and (3) channel stability measurements.
Long-term success criteria will be evaluated by monitoring and documenting the following:
• Channel aggradation or degradation,
• streambank erosion,
• effectiveness of erosion control measures,
• presence of instream bar deposits,
• health and survival of indigenous, non-invasive vegetation, and
• changes in as-built channel pattern, profile and dimension.
Parameters included in the annual stream monitoring to ensure the success of the restoration
activities will include stream channel surveys along longitudinal profiles and monumented cross
sections, pebble counts across representative riffle and pool cross-sections, photographs, and
vegetation surveys.
The restoration site will be monitored for five consecutive years or until the required success
criteria have been met as determined by North Carolina Division of Water Quality (DWQ) and
• the Wilmington District of the U.S. Army Corps of Engineers (USACE). Channel stability
monitoring field surveys, including measurements and photographs, will be performed during
June 2009. Planting was completed on April 6, 2009. The planted vegetation will first be
monitored during the growing season, in September-October 2009. Monitoring will be
conducted in accordance with the multi-agency, North Carolina Stream Mitigation Guidelines
(April 2003) applicable to Restoration and Enhancement Level I projects and the template
Content, Format and Data Requirements for EEP Monitoring Reports, Version 1.2 (11/16/06).
Vegetation monitoring will be conducting in accordance with CVS-EEP Protocol for Recording
Vegetation, Version 4.2 (Lee, M.T., Peet, RK., Roberts, S.R., Wentworth, T.R. 2008) for Levels
1 and 2 Plot Sampling.
Monitoring reports and discussions of remedial actions will take place with EEP. EEP will
review the monitoring documents and make them available to the agencies after the review
period. Decision making regarding remediation will be between EEP and WRC and its agents or
representatives. Agency interaction will take place through permit requests for maintenance
should they become necessary. Agency interaction will take place at the end of the monitoring
period.
3.1 Stream Channel Monitoring
Stream channel stability will be physically monitored at eight permanent, monumented cross-
sections annually. This includes seven cross-sections (4 riffles, 3 pools) on Davis Branch
mainstem, and two cross-sections (2 riffles) on UT1. Stream stability and pattern will also be
Evans, Mechwart, Hambleton & Tilton, Inc. Page 51
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ECOSYSTEM ENHANCEMENT PROGRAM
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EEP Contract # D06054-F
evaluated, with annual longitudinal profiles surveyed along the entire length of each restored
reach during the five year monitoring period.
Photographs will be taken upstream, downstream and across channel at each monumented cross-
section at the time of survey. The monumented cross-section locations and longitudinal profiles
were surveyed immediately following construction as part of the "As-Built" survey and are
shown on the As-Built Plan sheets in Section 7.0. The As-Built Plan sheets include the
dimension, pattern, and profiles of the constructed stream channels. The As-Built condition
(Year 0) will be utilized as baseline to compare future monitoring surveys and subsequently to
determine channel stability and transition. Year 0 "As-Built" Long-Term Monitoring Profiles are
included in Appendix B. Year 0 "As-Built" Long-Term Monitoring Cross-Section summary
templates and particle distribution summary templates are included in Appendix C.
Yearly monitoring will also include pebble counts to evaluate streambed particle distributions.
Pebble count data will be collected at each of the nine monumented cross-sections. The number
of particles in standard size classes will be reported each year to assess sediment transport
capacity and competency, streambed particle sorting and depositional trends, and channel
stability over time. Annual inspection of in-stream structures, which for this project includes rock
sills, step-pools and constructed riffles, will also occur to verify proper function and stability.
Stream channel visual assessment surveys will be completed annually for five consecutive years,
beginning in September 2009 (Year 1), greater than six months post-construction completion.
Annual stream profile and cross-section surveys will be compared to the as-built conditions
stream corridor survey (Year 0, December 2008).
A minimum of two bankfull flow events will be documented during the five year monitoring
period, occurring separate monitoring years. Bankfull flow events will be documented utilizing
two galvanized steel 4-feet, USGS Type A crest-stage stream gages installed on the project
reaches; one crest-gage set at bankfull stage near the confluence of Davis Branch and UTI, and
one crest-gage set at bankfull stage on the right bank at Davis Branch mainstem profile station
19+18. Photo-documentation after bankfull flows will be presented in the monitoring reports.
The locations of the crest-stage stream gages are shown on the As-Built Plan Sheets in Section
7.0. In the event two bankfull events do not occur during the five-year monitoring period,
consultations with the U.S. Army Corps of Engineers, the Division of Water Quality and the
resource agencies will be coordinated to determine if further monitoring is necessary to
demonstrate success criteria have been achieved.
3.2 Planted Woody Vegetation Monitoring
Woody vegetation planted along the streams on April 6, 2009 will be monitored for five
consecutive years. Per the required plots calculation from EEP, a total of ten (10) ten by ten
meter square plots (eight along Davis Branch mainstem, and two along UTI) have been
permanently established. Corner markers were permanently installed and one corner surveyed
for future reference. The species, density of living stems, and the cause of mortality, if
identifiable, will be recorded for all planted woody species within each plot. Vegetation will be
Evans, Mechwart, Hambleton & Tilton, Inc. Page 52
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EEP Contract # D06054-F
sampled annually and reported each year along with the data collected during the physical
monitoring of the project stream reaches. The focus of the vegetative monitoring will be a stem
count of planted individuals in the tree and shrub stratum. Data on height and diameter will also
be recorded according to the CVS-EEP protocol. Percent cover of the plot will be documented
via photographic documentation at each vegetative plot. Vegetative problem areas along the
project area will be identified, mapped, and documented via photographs. Vegetation monitoring
will occur between the months of September and October.
3.3 Performance Standards
The performance standards for the restoration project are those mandated in the multi-agency
Stream Mitigation Guidelines (USACE Wilmington District, et al., April 2003). Performance
goals for the site are:
• Minimal or negligible development of instream bar deposits.
• Minimal or negligible change in channel pattern, profile and dimension in comparison to
As-Built conditions. Adjustments may occur and some may be indicative of increasing
stability, such as moderate reductions in width/depth ratios as a result of slight channel
narrowing and natural substrate sorting and shaping of bedform and features
• Maintenance of floodplain connectivity (only reductions or very small increases will be
considered acceptable).
• Target density of 320 stems per acre after 3 years and 260 stems per acre after 5 years for
planted woody vegetation (represents 80% survival after 5 years).
Subsequent monitoring reports will address the attainment of performance goals. If goals are not
being attained, then the monitoring reports will document any remedial actions taken during the
monitoring period and the success of those actions.
•
Evans, Mechwart, Hambleton & Tilton, Inc. Page 53
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ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
4.0 MAINTENANCE AND CONTINGENCY PLANS
Adaptive management is a systematic process for developing knowledge and continually
improving project development by learning from previous projects and their performance
outcomes (River Institute, 2004). This project is large in scope and entails many new applications
of natural stream channel design methodologies, making an adaptive management approach
essential to the success of the project. Rather than following the conventional approach to
construction projects where a plan is developed and closely constructed in a rigid and structured
format, we will employ a adaptive management strategy in the truest sense. Essentially, we have
initiated the initial restoration of the Davis Branch Mainstem and UTl in the context of the data,
methodologies and technology currently available. As the project is monitored, we will collect
data to verify the streams are evolving in the direction of increased stability and biological
diversity. As the data are collected and evaluated, the knowledge gained will be directly
integrated into the management and maintenance of the project throughout the monitoring period.
•

Evans, Mechwart, Hambleton & Tilton, Inc. Page 54
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ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
i 5.0 REFERENCES
Andrews, E.D. 1984. Bed-material Entrainment and Hydraulic Geometry of Gravel-Bed Rivers
in Colorado, Geological Society of America, Bulletin 95, 371-378.
Evans, Mechwart, Hambleton & Tilton, Inc., January 16, 2008, Davis Branch and Unnamed
Tributary Restoration Plan, Union County, North Carolina NC EEP Project Number D06054-F.
Fullagar, P.D., and Odom, A.L. 1973. Geochronology of Precambrian Gneisses in the Blue Ridge
Province of Northwestern North Carolina and Adjacent Parts of Virginia and Tennessee,
Geological Society America Bulletin, v. 84, p. 3065-3079.
Lee, Michael T. et al. 2008. CVS-EEP Protocol for Recording Vegetation Version 4 2 Level 1-2
Plot Sampling Only, NC EEP Website: http://www.nceep.net/business/monitoring/veg/cvs-eep-
manual-v4_lev 1-2.pdf.
NCDENR, 2006. Content, Format and Data Requirements for EEP Monitoring Reports Version
1.2 (11/16/06). NC EEP Website:
http://www.nceep.net/business/monitoring/Monitoring_report_web/pdfs/NCEEP_Monitoring_Re
port_Template_Ver_ I- 1 %20_09_ 16_05.pdf
0 Leopold, L.B., 1994. A View of the River, Harvard University Press, Cambridge, MA.
Leopold, L.B., Wolman, M.G., and Miller, J.B. 1964. Fluvial Processes in GeomorFholog
W.H. Freeman, San Francisco, CA.
Pfankuch, D.J., 1975. Stream Reach Inventory and Channel Stability Evaluation, USDA Forest
Service, R1-75-002. Government Printing Office #696-260/200, Washington, D.C., 26 pp.
River Institute, Center for Applied River Science, 2004.
Rosgen, D.L. and Silvey, H.L., 2008, River Stability Field Guide, Wildland Hydrology, Inc., Fort
Collins, CO.
Rosgen, D.L. and Silvey, H.L., 2008, River Stability Forms & Worksheets, Wildland Hydrology,
Inc., Fort Collins, CO.
Rosgen, D.L., 2006, Watershed Assessment of River Stability and Sediment Supply, Wildland
Hydrology, Inc., Fort Collins, CO.
Rosgen, D.L., 2006, River Restoration and Natural Channel Design Course Field Manual,
Wildland Hydrology, Inc., Fort Collins, CO.
9
Evans, Mechwart, Hambleton & Tilton, Inc. Page SS
Engineers, Surveyors, Planners, Scientists
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plati - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
Rosgen, D.L. and Silvey, H.L. 2005. The Reference Reach Field Book, Second Edition, Wildland
Hydrology, Inc., Fort Collins, CO.
Rosgen, D.L. 1998. The Reference Reach - A Blueprint for Natural Channel Design, ASCE
Conference on River Restoration in Denver Colorado - March 1988, Reston, VA.
Rosgen, D.L. and Silvey, H.L. 1998. Field Guide for Stream Classification, Second Edition,
Wildland Hydrology, Pagosa Springs, CO.
Rosgen, D.L. 1997. A Geomorpholo ig cpproach to Restoration of Incised Rivers, Proceedings
of the Conference on Management of Landscapes Disturbed by Channel Incision, Denver CO.
Rosgen, D.L., 1996. Applied River Morphology, Wildland Hydrology Books, Pagosa Springs,
CO.
Schafale, Michael P. and Weakley, Alan S. 1990. Classification of the Natural Communities of
North Carolina Third Approximation, North Carolina Department of the Environment, Health
and Natural Resource
Schumm, S.A., Harvey, M.D., and Watson, C.C. 1984. Incised Channels: Morphology,
Dynamics and Control, Water Resource Publication, Littleton, CO.
is Shields, A. 1936. Application of Similarity- Principles and Turbulence Research to Bedload
Movement, Mitt. Preuss. Verschsanst., Berlin. Wasserbau Schiffbau. In W.P. Ott and J.C.
Uchelen (translators), California Institute of Technology, Pasadena, CA. Report No. 167; 43 p.
USACE, et al. April 2003. Stream Mitigation Guidelines, U.S. Army Corps of Engineers -
Wilmington District, U.S. Environmental Protection Agency Region 4, North Carolina Wildlife
Resources Commission, North Carolina Division of Water Quality, USDA Natural Resources
Conservation Service, Raleigh, NC.
U.S. Department of Agriculture, Forest Service. 1994. Stream Channel Reference Sites: An
Illustrated Guide to Field Technique, General Technical Report RM-245, Rocky Mountain Forest
and Range Experiment Station, Fort Collins, CO.
U.S. Geological Survey. 2001. National Land Cover Dataset. Available for download at:
http://www.mrlc.gov/mrlc2k-nlcd.asp .
Williams, G.P. and Rosgen, D.L., 1989. Measured Total Sediment Loads (Suspended Loads and
Bedloads) for 93 United States Streams, U.S. Geological Survey Open File Report 89-67,
Denver, CO, 128 pp.
Wolman, M.G., 1954. A Method of Sampling Course River-Bed Material, Transactions of
American Geophysical Union 35: 951-956.
Evans, Mechwart, Hambleton & Tilton, Inc. Page 56
Engineers, Surveyors, Planners, Scientists
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
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Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
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ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
•
Appendix A
Davis Branch Mainstem and Unnamed Tributary 1
Fixed Station As-Built Photographic Documentation
•
0
PHOTOGRAPH DOCUMENTATION ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributaries EEP Contract # D06054-F

E

is
Photograph 2
Fixed Station 2. Overview of Davis Branch,
looking downstream near Sta. 14+75
Photograph 1
Fixed Station 1. Overview of Davis Branch,
looking downstream at Sta. 7+80
Photograph 4
Fixed Station 4. Overview of Davis Branch,
looking upstream near Sta. 25+75
Photograph 3
Fixed Station 3. Overview of Davis Branch,
looking downstream near Sta. 15+50
PHOTOGRAPH DOCUMENTATION ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributaries EEP Contract # D06054-F
•
•
•
? a
i? r b ? :
°'- -? A
lull
r i 5+
r
Photograph 6
Fixed Station 6. Overview of Davis Branch,
looking upstream near Sta. 38+75

Photograph 8
Fixed Station 8. Overview of UT1,
looking downstream near Sta. 4+50
2
Photograph 5
Fixed Station 5. Overview of Davis Branch,
looking upstream near Sta. 27+25
Photograph 7
Fixed Station 7. Overview of UT1,
looking upstream near Sta. 6+50
PHOTOGRAPH DOCUMENTATION ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributaries EEP Contract # D06054-F
•

In
j
a?
h^J ?
A
3 :
RY

Photograph 11
Example Structure. Riffle near Station 6+00
on UT1, looking upstream.
•
?1?t? ?1ti wtr??l ``•??i
a 1
IL J=1
IV-

3
Photograph 9
Example Structure. Riffle near Sta. 22+00
on Davis Branch, looking downstream.
Photograph 10
Example Structure. Riffle near Sta. 36+75
on Davis Branch, looking upstream.
Photograph 12
Example Structure. Rock Sill near Station
0+00 on UT1, looking upstream.
VEGETATION PHOTO DOCUMENTATION ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributaries EEP Contract # D06054-F
•
Vegetation Plot No. 1
10m x 10 m. Davis Branch Mainstem
Station 11+00, looking downstream.
9? M per ? ,'fin
Vegetation Plot No. 3
10m x 10 m. Davis Branch Mainstem
Station 15+50, looking downstream.
GAT
is
Vegetation Plot No. 2
10m x 10 m. Davis Branch Mainstem
Station 13+00, looking downstream.
Vegetation Plot No. 4
10m x 10 m. Davis Branch Mainstem
Station 24+50, looking downstream.
VEGETATION PHOTO DOCUMENTATION ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributaries EEP Contract # D06054-F
•
•
•

a
A

r -_p y
p
M +R^
tw'
Vegetation Plot No. 7
10m x 10 m. Davis Branch Mainstem
Station 35+50, looking downstream.

Q
Vegetation Plot No. 9
10mx10m.UT1
Station 2+00, looking downstream.

err.
aaatpiai
,ow- 4
Vegetation Plot No. 8
10m x 10 m. Davis Branch Mainstem
Station 37+50, looking downstream.
y:
Vegetation Plot No. 10
10mx10m.UT1
Station 6+00, looking downstream.
2
Vegetation Plot No. 5
10m x 10 m. Davis Branch Mainstem
Station 31+50, looking downstream.
?sci?w.?rr..w
Vegetation Plot No. 6
10m x 10 m. Davis Branch Mainstem
Station 34+50, looking downstream.
ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
0
Appendix B
As-Built Long-Term Monitoring Profiles
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Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
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ECOSYSTEM ENHANCEMENT PROGRAM
Mitigation Plan - Davis Branch and Unnamed Tributary
EEP Contract # D06054-F
•
•
Appendix D
Supporting Documentation
0
Worksheet 5-3. Field form for Level II stream classification (Rosgen, 1996; Rosgen and Silvey, 2005).
•
t
Stream: Davis Branch Mainstem Restoration Reach - "As-Built"
Basin: Yadkin - PeeDee River Drainage Area: 116.67 acres 0.1823 mil
Location: Eddie Staton Property, 7.8 mi. NNE from Marshville, NC
Twp.&Rge: ; Sec.&Qtr.: ;
Cross-Section Monuments (Lat./Long.): 35.08722 Lat / 80.32286 Long Date: 05/05/09
Observers: M. Hebert, PE, J. Hines, PE & W. Knotts, PG Valley Type: VIII
Bankfull WIDTH (Wbkf)
WIDTH of the stream channel at bankfull stage elevation, in a riffle section. 13,3$
Bankfull DEPTH (dbkf) l
Mean DEPTH of the stream channel cross-section, at bankfull stage elevation, in a
riffle section (dbkf = A / Wbkf). 0.75 f
Bankfull X-Section AREA (Abkf)
AREA of the stream channel cross-section, at bankfull stage elevation, in a riffle
section.
9.98
Width/Depth Ratio (Wbkf/ dbkf)
Bankfull WIDTH divided by bankfull mean DEPTH, in a riffle section. 17.84
Maximum DEPTH (dmbkf)
Maximum depth of the bankfull channel cross-section, or distance between the
bankfull stage and Thalweg elevations, in a riffle section. 1.62 f
ft2
ft/ft
WIDTH of Flood-Prone Area (Wfpa)
Twice maximum DEPTH, or (2 x dmbkf) = the stage/elevation at which flood-prone area
WIDTH is determined in a riffle section. 63.06 f
Entrenchment Ratio (ER)
The ratio of flood-prone area WIDTH divided by bankfull channel WIDTH (Wfpa/ Wbkf)
(riffle section). 4.71
ft/ft
Channel Materials (Particle Size Index ) Dso
The D50 particle size index represents the mean diameter of channel materials, as
sampled from the channel surface, between the bankfull stage and Thalweg
elevations.
33.3
mm
Water Surface SLOPE (S)
Channel slope = "rise over run" for a reach approximately 20-30 bankfull channel
widths in length, with the "riffle-to-riffle" water surface slope representing the gradient
at bankfull stage.
0.01304
Channel SINUOSITY (k)
Sinuosity is an index of channel pattern, determined from a ratio of stream length
divided by valley length (SL / VL); or estimated from a ratio of valley slope divided by
channel slope (VS / S).
1.29
Stream C 4/1
Type (See Figure 2-14)
ft/ft
Copyright © 2006 Wildland Hydrology
WARSSS page 5-29
Worksheet 5-4. Morphological relations, including dimensionless ratios of river reach sites (Rosgen and Silvey, 2005).
1?
•
•
Stream: Davis Branch Mainstem Restoration Reach "As-Built" Location: Staton Property, 7.8 mi. NNE from Marshville, NC
Observers: M. Hebert, PE, J. Hines, PE & W. Knotts, PG Date: 5/5/2009 Valley Type: VIII Stream Type: C 4/1
River Reach Summary Data
Mean Riffle Depth (dbkr) 0.6 :ft Riffle Width (Wbkf) 11.28 Ift Riffle Area (Abkf) 0 :ft2
c

0 Mean Pool Depth (dbkfp)
Pool Width (;7V,,,,) 16.36 ift Pool Area (AbkfP)
0.97 ift
15.31 1ftz
E_
E Mean Pool Depth Mean Riffle Depth 1.62 dbk,P/ dbkr Pool Width/Riffle Width 1.45 jWbkfd
'WbI Pool Area / Riffle Area 2.19 iAbk' A
Ibk,

m Max Riffle Depth (dmax,) 1.25 :ft Max Pool Depth (d,,,) 2.22 Ift Max Riffle Depth/Mean Riffle Depth 2.08
Max Pool Depth/Mean Riffle Depth 3.70 Point Bar Slope 0,1 ft ft Inner Berm Width (WO 0 :ft
L
U
Inner Berm Depth (d;b)
0 ift Inner Berm Width/Depth Ratio 0 W;b d;b Inner Berm Area (A
I ,b) 0 ;ft2

_j
I
Streamflow: Estimated Mean Velocity at Bankfull Stage (ubkf) 3.74 Ift/s Estimation Method Manning'S Eq.
Streamflow: Estimated Discharge at Bankfull Stage ((Dbkf) 24.8 :cfs Drainage Area 0.3352 Imi2

Geometry Mean Min Max Dimensionless Geometry Ratios Mean Min Max
c Meander Wavelength (Lm) 77.76 49.94 101.80 ift Meander Length Ratio (L,? Wbkt) 6.89i 4.43 9.02
li Radius of Curvature (Rj I 19.70 10.65 35.00 Ift Radius of Curvature/Riffle Width (Rc/Wbkr) ; 1.75 :0.94 ; 3.10
C Belt Width (Wb„) 50.00 50.00 50.00 !ft Meander Width Ratio (Wbi,/Wbkf) 4.43 4.43 4.43
v individual Pool Length ! 24.47 11.47 i 42.63 Ift Pool Length/Riffle Width j 2.17 1.02 1 3.78
Pool to Pool Spacing i 40.33 i 16.80 i 79.78 ift Pool to Pool Spacing/Riffle Width 3.58 i 1.49 i 7.07
Riffle Length ! 12.55 i 7.05 i 34.47 ift Riffle Length/Riffle Width i 1.11 1 0.63: 3.06

Valley Slope (VS) 0.01680 ift/ft Average Water Surface Slope (S) 0.01304 ift/ft Sinuosity (VS/S) j 1.29
Stream Length (SL) 1799 Ift Valley Length (VL) 1397 :ft Sinuosity (SUVL) i 1.29
Low Bank Height
(LBH) start` 0.92 :ft
endl 1.63 Ift Max Riffle start: 0.92 :ft
Depth end! 1.63 Ift Bank-Height Ratio BHR start
(LBH/Max Riffle Depth) end: 1
2 Facet Slopes Mean Min Max Dimensionless Slope Ratios Mean Min Max
o
a` Riffle Slope (S,,) I 0.0482 I 0.0281 : 0.0747 Ift/ft Riffle Slope/Average Water Surface Slope (S,e / S) :3.698:2.152:5.727
d
c Run Slope (S,") ift/ft Run Slope/Average Water Surface Slope (S,,„ / S)
Pool Slope (Sp) i 0.0021 i 0.0000 i 0.0052 ift/ft Pool Slope/Average Water Surface Slope (Sp / S) 10.16310.00010.401
U Glide Slope (S9) Ift/ft Glide Slope/Average Water Surface Slope (S. / S)
Feature Midpoint a Mean Min Max Dimensionless Depth Ratios Mean Min Max
Max Riffle Depth (dma n) 1.25 0.92 1.63 Ift Max Riffle Depth/Mean Riffle Depth (dP,a,"rf/ dbkr) j 2.081 1.531 2.72
Max Run Depth (d,"a-) :ft Max Run Depth/Mean Riffle Depth (d_ / dbkf)
Max Pool Depth (d,,,a,) 2.22 1.74 3.11 :11 Max Pool Depth/Mean Riffle Depth (dmav /dbkf) : 3.7 1 2.9 i 5.18
Max Glide Depth (dma.y) Ift Max Glide Depth/Mean Riffle Depth (d",ax9 / dbkf)
m Reach b Riffle' Bar Reach b Riffle` Bar
_ r tr i n ei htd
! % Silt/Clay 0 0
7 F
D,6 : 19.28 22.07
0 :mm
is % Sand 0 1.67 D3, I 27.34 29.49 0 mm
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U % Gravel

% Cobble 96.23
85 Dso 33.3 36.33

3.77 13.33 D. ? 52.81 61.46 0 Imm

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Boulder 0 0 D9s : 62.87 85.66
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Bedrock 0 0
D100 i 128 128
0 :mm
•• • •w, •• ?u • ?GP.al= a??. ?????-Puun vwuas -K Pf pools: caKen ar oeepesi pan or poor ` Active bed of a riffle,
b Composite sample of riffles and pools within the designated reach. a Height of roughness feature above bed.
Copyright © 2006 Wildland Hydrology
WARSSS page 5-31
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Worksheet 5-3. Field form for Level II stream classification (Rosgen, 1996; Rosgen and Silvey, 2005).
•

•
Stream: Davis Branch Mainstem - Enhancement Level 1 Reach "As-Built"
Basin: Yadkin - PeeDee R. Drainage Area: 214.53 acres 0.3352 mil
Location: Eddie Staton Property, 7.8 mi. NNE from Marshville, NC
Twp.&Rge: ; Sec.&Qtr.: ;
Cross-Section Monuments (Lat./Long.): 35.08931 Lat / 80.32697 Long Date: 05/05/09
Observers: M. Hebert, PE, J. Hines, PE & W. Knotts, PG Valley Type: VI I I
Bankfull WIDTH (Wbkf)
WIDTH of the stream channel at bankfull stage elevation, in a riffle section. 15.97
Bankfull DEPTH (dbkf)
Mean DEPTH of the stream channel cross-section, at bankfull stage elevation, in a
riffle section (dbkf = A / Wbkf). 0.65 f
Bankfull X-Section AREA (Abkf)
AREA of the stream channel cross-section, at bankfull stage elevation, in a riffle
section.
10.38
Width/Depth Ratio (Wbkf / dbkf)
Bankfull WIDTH divided by bankfull mean DEPTH, in a riffle section. 24.57
Maximum DEPTH (d,,,bkf)
Maximum depth of the bankfull channel cross-section, or distance between the
bankfull stage and Thalweg elevations, in a riffle section. 1.31
WIDTH of Flood-Prone Area (Wt a)
Twice maximum DEPTH, or (2 x dmbkf) = the stage/elevation at which flood-prone area
WIDTH is determined in a riffle section. 59.88 f
ft2
ft/ft
Entrenchment Ratio (ER)
The ratio of flood-prone area WIDTH divided by bankfull channel WIDTH (Wfp./ Wbkf)
(riffle section). 3.75
mm
Channel Materials (Particle Size Index ) Dso
The D50 particle size index represents the mean diameter of channel materials, as
sampled from the channel surface, between the bankfull stage and Thalweg
elevations.
63.1
Water Surface SLOPE (S)
Channel slope = "rise over run" for a reach approximately 20-30 bankfull channel
widths in length, with the "riffle-to-riffle" water surface slope representing the gradient
at bankfull stage. 0.02122
Channel SINUOSITY (k)
Sinuosity is an index of channel pattern, determined from a ratio of stream length
divided by valley length (SL / VL); or estimated from a ratio of valley slope divided by
channel slope (VS / S).
1.06
Stream C 4/1 b
(See Figure 2-14)
Type
ft/ft
Copyright © 2006 Wildland Hydrology
WARSSS page 5-29
Worksheet 5-4. Morphological relations, including dimensionless ratios of river reach sites (Rosgen and Silvey, 2005).
•
•
•
Stream: Davis Branch Mainstem "As-Built" Enhancement 1 Reach Location: Staton Property, 7.8 mi. NNE from Marshville, NC
Observers: M. Hebert, PE, J. Hines, PE & W. Knotts, PG Date: 5/5/2009 Valley Type: VIII Stream Type C 4/1b
River Reach Summary Data
Mean Riffle Depth (dbkf) 0.62 jft Riffle Width (Wbkf) 16.68 "ft Riffle Area (Abkf) 10.3 IT
c
o Mean Pool Depth (dbkp) 1.42 :ft Pool Width (Wbkfp) 11.81 ft Pool Area (AbkP) 16.75 ftZ
_
a
y
E
Mean Pool Depth/Mean Riffle Depth 2.29 jdbkfp dbkf
Pool Width/Riffle Width ) 0.71 IWbkfp
I W bkf
Pool Area /Riffle Area 1.62 IAbkf A
I bkf

d Max Riffle Depth (dmax,,) 1.56 ;ft Max Pool Depth (d",.) 2.65 ;ft Max Riffle Depth/Mean Riffle Depth 2.52
C Max Pool Depth/Mean Riffle Depth 4.27 Point Bar Slope 0,1 ft/ft Inner Berm Width RIO
; 0 ;ft
t
U
Inner Berm Depth (d;b) 0 ift Inner Berm Width/Depth Ratio 0 Nb/d;b Inner Berm Area (Ab) ; 0 ftZ
Streamflow: Estimated Mean Velocity at Bankfull Stage (ubkf) 3.74 ;ft/s Estimation Method i Manning's Eq.
Streamflow: Estimated Discharge at Bankfull Stage (Qbkf) 24.8 cfs Drainage Area 0.3352 miz

Geometry Mean Min Max Dimensionless Geometry Ratios Mean Min Max

m Meander Wavelength (Lm) :ft Meander Length Ratio (Lm/Wbkf)
a Radius of Curvature (R) ;ft Radius of Curvature/Riffle Width (Rc/Wbk,)

c Belt Width (Wbn) 50 50 50 ;ft Meander Width Ratio (Wbn/Wbkf) ; 3.00 ; 3.00 ; 3.00
L
U Individual Pool Length 29.52 9.5 50.09 ift Pool Length/Riffle Width i 1,77,70-5-7 3.00
Pool to Pool Spacing 63.42 28.32 109.07 ft Pool to Pool Spacing/Riffle Width 3.80 i 1.70 6.54
Riffle Length 62.32 18.72 109.88 !ft Riffle Length/Riffle Width 3.74 1.12 6.59

Valley Slope (VS) 0.01680 ;ft ft Average Water Surface Slope (S) 0.02122 ;ft/ft Sinuosity (VSlS) ! 1.06
Stream Length (SL) 1289 Ift Valley Length (VL) 1213 )ft Sinuosity (SL/VL) 1.06
Low Bank Height start 1.4 ft
--------------?
(LBH) end; 1.87 ;ft Max Riffle start:- 1.4 ft
I ----- 11
Depth end; 1.87 ;ft Bank-Height Ratio (BHR) start! 1
r
(LBH/Max Riffle Depth) end; 1
d
o
a` Facet Slopes Mean Min Max Dimensionless Slope Ratios Mean Min Max
Riffle Slope (S,n) i 0.05911 ; 0.03157 ; 0.121671 ft ft Riffle Slope/Average Water Surface Slope (S,n / S) ; 2.79 ; 1.49 ; 5.73
c Run Slope (S,"") ;ft/ft Run Slope/Average Water Surface Slope (S,"" / S)
t
L) Pool Slope (SP) I 0.00278 i 0.00041 ; 0.00721 ;ft/ft Pool Slope/Average Water Surface Slope (SP / S) ; 0.13 ; 0.02 ; 0.34
Glide Slope (S9) ;ft/ft Glide Slope/Average Water Surface Slope (S9 / S)
Feature Midpoint a Mean Min Max Dimensionless Depth Ratios Mean Min Max
Max Riffle Depth (dm, m) 1.56 1.4 1.87 ;ft Max Riffle Depth/Mean Riffle Depth (dm-rn/ dbkf) ; 2.52 ; 2.26 ; 3.02
Max Run Depth (dmaxr"") ;ft Max Run Depth/Mean Riffle Depth (dm,xr"" / dbk )
_j Imax Pool Depth (dmw) 2.65 2.08 3.33 ;ft Max Pool Depth/Mean Riffle Depth (d.-p / dbkf) 4.27 ) 3.35 ) 5.37
Max Glide Depth (dmax9) ;ft Max Glide Depth/Mean Riffle Depth (d",ax9 / dbkf)
y Reachb Riffle` Bar Reachb Riffle` Bar Protrusion Height d
%Silt/ClaY 0 0 D,e -,:13.75 16.18 0 ;mm
Sand 2.9 0 Day 42.24 35.42 0 ;mm
c
c % Gravel 47.82 41.27 Dso 63.06 97.12 0 imm
r
U % Cobble 36.24 46.03 D80. 179.28 216.5 0 !mm
Boulder 0 4.76 D95 Bedrock Bedrock 0 'mm
Bedrock 13.04 7.94 D,oo , Bedrock Bedrock 0 Imm
r• u,? N? r a ??? -upr pugs. rdnen of aeepes[ pan or pool. ` Active bed of a riffle.
b Composite sample of riffles and pools within the designated reach. d Height of roughness feature above bed.
Copyright © 2006 Wildland Hydrology
WARSSS page 5-31
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Worksheet 5-3. Field form for Level II stream classification (Rosgen, 1996; Rosgen and Silvey, 2005).
•
•
P_.?
Stream: Davis Branch, UT1 Restoration Reach "As-Built"
Basin: Yadkin - Pee Dee River Drainage Area: 46.144 acres 0.0721 mil
Location: Eddie Staton Property, 7.8 Miles N-NE of Marshville, Union Co., NC
Twp.&Rge: ; Sec.&Qtr.: ;
Cross-Section Monuments (Lat./Long.): 35.09175 Lat / 80.32553 Long Date: 05/05/09
Observers: M. Hebert, PE, J. Hines, PE, W. Knotts, PC Valley Type: II
Bankfull WIDTH (Wbkf)
WIDTH of the stream channel at bankfull stage elevation, in a riffle section. 12.18
Bankfull DEPTH (dbkf)
Mean DEPTH of the stream channel cross-section, at bankfull stage elevation, in a
riffle section (dbkf = A / Wbkf). 0.42
Bankfull X-Section AREA (Abkf)
AREA of the stream channel cross-section, at bankfull stage elevation, in a riffle
section.
5.14
Width/Depth Ratio (Wbkf / dbkf)
Bankfull WIDTH divided by bankfull mean DEPTH, in a riffle section. 29
Maximum DEPTH (dmbkf)
Maximum depth of the bankfull channel cross-section, or distance between the
bankfull stage and Thalweg elevations, in a riffle section. 1.02
WIDTH of Flood-Prone Area (Wfpa)
Twice maximum DEPTH, or (2 x dmba) = the stage/elevation at which flood-prone area
WIDTH is determined in a riffle section. 57.74
ft2
ft/ft
Entrenchment Ratio (ER)
The ratio of flood-prone area WIDTH divided by bankfull channel WIDTH (Wfpa/ Wbkf)
(riffle section). 4.74
mm
Channel Materials (Particle Size Index) D50
The D50 particle size index represents the mean diameter of channel materials, as
sampled from the channel surface, between the bankfull stage and Thalweg
elevations. 38.5
Water Surface SLOPE (S)
Channel slope = "rise over run" for a reach approximately 20-30 bankfull channel
widths in length, with the "riffle-to-riffle" water surface slope representing the gradient
at bankfull stage. 0.02021
Channel SINUOSITY (k)
Sinuosity is an index of channel pattern, determined from a ratio of stream length
divided by valley length (SL / VL); or estimated from a ratio of valley slope divided by
channel slope (VS / S).
1.37
Stream C 4/1 b
(See Figure 2-14)
Type
ft/ft
Copyright © 2006 W ildland Hydrology
WARSSS page 5-29
Worksheet 5-4. Morphological relations, including dimensionless ratios of river reach sites (Rosgen and Silvey, 2005).
•
•
•
Stream: Davis Branch UT-1 Restoration Reach "As-Built" Location: 7.8 Miles N-NE of Marshville, Union Co., NC
Observers: M. Hebert PE, J. Hines, PE, W, Knotts, PG Date: 5/5/2009 Valley Type: 11 Stream Type: C 4/1b
River Reach Summary Data
Mean Riffle Depth (dba) 0.43 !ft Riffle Width (Wbk,) 12.38 !ft Riffle Area (A,,,) 5.14 i ft2
e Mean Pool Depth (dbk,,) 0.79 ift Pool Width (Wbk,P) 7 ift Pool Area (AbkP) 5.51 jft2
y
E Mean Pool Depth/Mean Riffle Depth 1 1.83721 1dbkf,/ dba Pool Width/Riffle Width ! 0.57 1 Wbad
I W ba Pool Area / Riffle Area 1.04 Abkrp A
bkf

? Max Riffle Depth (dmax,,) 0.99 :ft Max Pool Depth (dm
axp) 1.78 i"ft Max Riffle Depth/Mean Riffle Depth 2.30
C Max Pool Depth/Mean Riffle Depth 4.14 Point Bar Slope 0,1 ft/ft inner Berm Width (W;b) 0 jft
U Inner Berm Depth (db) 0 :ft Inner Berm Width/Depth Ratio 0 i W;b/d,b Inner Berm Area (A,b) I 0 ft2
Streamflow: Estimated Mean Velocity at Bankfull Stage (ubkf) 2.14 lft/s Estimation Method 1 Manning's Eq.
Streamflow: Estimated Discharge at Bankfull Stage (Qbkf) 11.0 lcfs Drainage Area 0.0721 lmiZ

Geometry Mean Min Max Dimensionless Geometry Ratios Mean Min Max
E
m Meander Wavelength (Lm) 52.60 50.53 58.82 ift meander Length Ratio (L",/W,k,) j 4.25 1 4.08 4.75
a Radius of Curvature (Rj ! 12.00 1 11.10 ! 18.00 ift Radius of Curvature/Riffle Width (Rc/Wbk,) i 0.97 1 0.90 i 1.45
c
c Belt Width (Won) 50.00 50.00 50.00 ift Meander Width Ratio (Wbn/Wbkf) ! 4.04 1 4.041 4.04
U Individual Pool Length 1 17.19 ! 11.86 i 28.40 ift Pool Length/Riffle Width 1.39 i 0.96 1 2.29
Pool to Pool Spacing 28.68 1 12.82 1 50.32 ift Pool to Pool Spacing/Riffle Width i 2.32 ! 1.04 i 4.06
Riffle Length ! 16.95 i 8.72 42.99 !ft Riffle Length/Riffle Width 1.37 ; 0.70 ; 3.47

Valley Slope (VS) 0.02704 !ft ft Average Water Surface Slope (S) 0.02021 ifUft Sinuosity (VS/S) 1.37
Stream Length (SL) 459 ift Valley Length (VL) 334 lft Sinuosity (SL/VL) ! 1,37
Low Bank Height

(LBH) start! 0.88 !ft
------------
end! 1.33 ift Max Riffle

Depth start: 0.88 ift

F I
endj 1.33 jft Bank-Height Ratio (BHR) start! 1

1 -
(LBH/Max Riffle Depth) end: 1
------
m Facet Slopes Mean Min Max Dimensionless Slope Ratios Mean Min Max
o
a` Riffle Slope (S,k) 10.049591 0.03718 1 0.06820 lft/ft Riffle Slope/Average Water Surface Slope (S, / S) ! 2.45 ! 1.84 ! 3.37
Z Run Slope (S,,") ift/ft Run Slope/Average Water Surface Slope (S,"" / S)
L Pool Slope (SP) 1 0.00267: 0.00170 ! 0.00475 ift/ft Pool Slope/Average Water Surface Slope (SP / S) ! 0.13 i 0.08 ; 0.24
V Glide Sloe (S
P 9)
jft/ft
Glide Slope/Average Water Surface Slope (S9 / S)
Feature Midpoint s Mean Min Max Dimensionless Depth Ratios Mean Min Max
Max Riffle Depth (dmaxra) 0.99 0.95 1.02 lft Max Riffle Depth/Mean Riffle Depth (dmax,a/ dba) 2.3 1 2.21 j 2.37
Max Run Depth (dma„ ") ift Max Run Depth/Mean Riffle Depth (d",ax,u" / dbk,)
Max Pool Depth (d,,,) 1.78 1.28 2.56 !ft Max Pool Depth/Mean Riffle Depth (d- /dba) ! 4.14 ! 2.98 ! 5.95
Max Glide Depth (d",ax9) jft Max Glide Depth/Mean Riffle Depth (dman / dba)
v Reachb Riffle` Bar Reachb Riffle` Bar Protrusion Might d
m °% Silt/Clay
% Sand 0 0
1.61 2.82 D,6 1 7.65 10.77
D35 18.31 20.83 0 imm
0 imm
6
c
c % Gravel
74.2 83.1
Dso ! 38.5 28.75
0 17-
t 1
U % Cobble 24.19 14.08 D84 91.02 62.01 0 :mm
Boulder 0 0 D95 ! 156.97 103.77 0 !mm
Bedrock 0 0

D , 180 255.99
F

0 imm
-- -- ?-N, - a r aye. u-punu vawes except pools: raKen at oeepest part of pool. Active bed of a riffle.
b Composite sample of riffles and pools within the designated reach. " Height of roughness feature above bed.
Copyright © 2006 Wildland Hydrology
WARSSS page 5-31
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C.
•
XS1 RIF YRO.tXt
RIVERMORPH CROSS SECTION SUMMARY
River Name: Davis Branch
Reach Name: Davis Branch Mainstem As-Built
Cross Section Name: XS1 MS RIF YRO
Survey Date: 05/05/2009
---------------------------------------------------------------
Cross section Data Entry
BM Elevation: 0 ft
Backsight Rod Reading: 0 ft
TAPE
FS
ELEV
NOTE
0 0 472.3 left mon 1
13.45 0 471.9 FP
34.68 0 470.85 FP
46.13 0 471.26 FP
66.56 0 470.6 FP
81.21 0 470.37 LB
86.94 0 469.3 Tw0.00 r
91.45 0 470.17 BKF RB
103.51 0 469.88 FP
111.75 0 469.96 right mon 2
122.12 0 469.55 FP
137.21 0 469.58 FP
149.82 0 469.42 FP
156.53 0 469.5 FP
---------------------------------------------------------------
Cross Sectional Geometry
---------------------------------------------------------------
Channel Left Right
Floodprone Elevation (ft) 471.04 471.04 471.04
Bankfull Elevation (ft) 470.17 470.17 470.17
Floodprone width (ft) 112.74 ----- -----
Bankfull width (ft) 9.17 4.59 4.58
Entrenchment Ratio 12.3 ----- -----
Mean Depth (ft) 0.44 0.43 0.44
Maximum De th (ft) 0.87 0.86 0.87
width/Depth Ratio 20.84 10.67 10.41
Bankfull Area (sq ft) 3.99 1.97 2.02
wetted Perimeter (ft) 9.33 5.53 5.52
Hydraulic Radius (ft) 0.43 0.36 0.37
Page 1

•
•
XS1 RIF YRO.txt
Begin BKF Station 82.28 82.28 86.87
EnBKF Station 91.45 86.87 91.45
Entrainment calculations
---------------------------------------------------------------
Entrainment Formula: Rosgen modified shields curve
Channel Left side Right side
Slope 0.00828 0 0
shear stress (lb/sq ft) 0.22
Movable Particle (mm) 50.3
Page 2
XS2 POOL YRO.txt
RIVERMORPH CROSS SECTION SUMMARY
•
C?
11
River Name: Davis Branch
Reach Name: Davis Branch Mainstem As-Built
cross section Name: XS2 MS POOL YRO
Survey Date: 05/05/2009
Cross section Data Entry
BM Elevation: 0 ft
Backsight Rod Reading: 0 ft
TAPE
---------- FS
------------- ELEV
----------------- NOTE
----------------
0 0 470.9 left mon 1
20.05 0 470.45 FP
35.62 0 469.93 FP
54.17 0 469.95 BKF LB
60.06 0 467.84 TWO.00 p
65.9 0 470.1 RB
78.97 0 469.94 FP
87.38 0 469.64 FP
91.34 0 469.96 right mon 2
122.12 0 469.55 FP
137.21 0 469.58 FP
149.82 0 469.42 FP
156.53 0 469.5 FP
Cross sectional Geometry
---------------------------------------------------------------
Channel Left Right
Floodprone Elevation (ft) 472.06 472.06 472.06
Bankfull Elevation (ft) 469.95 469.95 469.95
Floodprone width (ft) 156.53 ----- -----
Bankfull width (ft) 11.34 5.67 5.67
Entrenchment Ratio 13.8 ----- -----
Mean Depth (ft) 1.06 1.02 1.09
Maximum Depth (ft) 2.11 2.03 2.11
width/Depth Ratio 10.7 5.56 5.2
Bankfull Area (sq ft) 11.97 5.76 6.21
wetted Perimeter (ft) 12.1 8.05 8.11
Hydraulic Radius (ft) 0.99 0.71 0.77
Begin BKF Station 54.17 54.17 59.84
Page 1
XS2 POOL YRO.tXt
End BKF Station 65.51 59.84 65.51
40 ---------------------------------------------------------------
Entrainment calculations
---------------------------------------------------------------
Entrainment Formula: Rosgen modified shields curve
channel Left Side Right side
slope 0.00828 0 0
Shear stress (lb/sq ft) 0.51
Movable Particle (mm) 92.8
U
•
Page 2
xS3 RIF YRO.txt
RIVERMORPH CROSS SECTION SUMMARY
•
•
C7
River Name: Davis Branch
Reach Name: Davis Branch Mainstem As-Built
Cross Section Name: xS3 MS RIF YRO
Survey Date: 05/05/2009
Cross Section Data Entry
BM Elevation: 0 ft
Backsight Rod Reading: 0 ft
TAPE
---------- FS
-------------- ELEV
---------------- NOTE
----------------
0 0 462.49 left mon 1
19.15 0 461.18 FP
31.16 0 460.16 FP
40.24 0 459.63 FP
46.8 0 458.89 BKF LB
53.15 0 457.37 Tw0.00 r
58.97 0 459.08 BKF RB
72.67 0 459.37 FP
82.7 0 458.97 CL FP CH
85.86 0 459.46 FP
90.47 0 461.19 FP
93.54 0 462.17 right mon 2
Cross Sectional Geometry
---------------------------------------------------------------
Channel Left Right
Floodprone Elevation (ft) 460.61 460.61 460.61
Bankfull Elevation (ft) 458.99 458.99 458.99
Floodprone width (ft) 63.06 ----- -----
Bankfull width (ft) 13.38 6.98 29.94
Entrenchment Ratio 4.71 ----- -----
Mean Depth (ft) 0.75 0.73 0.76
Maximum Depth (ft) 1.62 1.56 1.62
width/Depth Ratio 17.84 9.56 39.39
Bankfull Area (sq ft) 9.98 5.09 4.89
wetted Perimeter (ft) 13.8 8.71 8.2
Hydraulic Radius (ft) 0.72 0.58 0.6
Begin BKF Station 45.91 45.91 52.89
End BKF Station 82.83 52.89 82.83
Page 1
Xs3 RIF YRO.txt
---------------------------------------------------------------
Entrainment calculations
---------------------------------------------------------------
Entrainment Formula: Rosgen modified shields Curve
channel Left side Right side
slope 0.01917 0 0
shear stress (lb/sq ft) 0.86
Movable Particle (mm) 136.2
•

Page 2
XS4 POOL YRO.txt
RIVERMORPH CROSS SECTION SUMMARY
•
•
C
River Name: Davis Branch
Reach Name: Davis Branch Mainstem As-Built
Cross Section Name: XS4 MS POOL YRO
Survey Date: 05/05/2009
Cross Section Data Entry
BM Elevation: 0 ft
Backsight Rod Reading: 0 ft
TAPE
---------- FS
------------- ELEV
----------------- NOTE
----------------
0 0 462.25 left mon 1
16.6 0 461.15 FP
28.75 0 459.82 FP
40.36 0 459.04 LB
46.81 0 456.44 TWO.00 p
51.68 0 457.8 RB
62.63 0 458.68 BKF
77.21 0 458.83 FP
86.13 0 460.94 FP
88.97 0 462.17 right mon 2
Cross Sectional Geometry
---------------------------------------------------------------
Channel Left Right
Floodprone Elevation (ft) 460.92 460.92 460.92
Bankfull Elevation (ft) 458.68 458.68 458.68
Floodprone width (ft) 67.34 ----- -----
Bankfull width (ft) 21.38 10.69 10.69
Entrenchment Ratio 3.15 ----- -----
Mean Depth (ft) 0.87 1.31 0.43
Maximum Depth (ft) 2.24 2.24 0.86
width/Depth Ratio 24.57 8.16 24.86
Bankfull Area (sq ft) 18.64 14.05 4.59
wetted Perimeter (ft) 22.03 12.17 11.58
Hydraulic Radius (ft) 0.85 1.15 0.4
Begin BKF Station 41.25 41.25 51.94
End BKF station 62.63 51.94 62.63
---------------------------------------------------------------
Page 1
XS4 POOL YRO.txt
• Entrainment calculations
---------------------------------------------------------------
Entrainment Formula: Rosgen modified shields curve
channel Left Side Right Side
Slope 0.01917 0 0
Shear stress (lb/sq ft) 1.02
Movable Particle (mm) 153.9
•
•
Page 2
X55 RIF YRO.tXt
RIVERMORPH CROSS SECTION SUMMARY

River Name: Davis Branch
Reach Name: Davis Branch Mainstem As-Built
cross section Name: XS5 MS RIF YRO
Survey Date: 05/05/2009
-------------
Cross section --------------
Data Entry ------------- -----------------------
BM Elevation: 0 ft
Backsight Rod Reading: 0 ft
TAPE
-------------- FS
------------- ELEV
-------------- NOTE
----------------------
0 0 447.11 left mon 1
5.72 0 445.06 FP
20.8 0 443.92 FP
33.64 0 442.28 FP
40.92 0 441.92 CL
49.82 0 442.43 FP
63.64 0 442.25 BKF LB
69.91 0 441.59 SB
74.95 0 441.03 TWO.00 r
78.38 0 441.79 SB
81.02 0 442.25 RB
93.02 0 444.34 FP
105.71 0 447.91 right mon 2
Cross sectional Geometry
---------------------------------------------------------------
Channel Left Right
Floodprone Elevation (ft) 443.47 443.47 443.47
Bankfull Elevation (ft) 442.25 442.25 442.25
Floodprone width (ft) 63.7 ----- -----
Bankfull width (ft) 17.38 10.05 7.33
Entrenchment Ratio 3.67 ----- -----
Mean Depth (ft) 0.59 0.53 0.67
Maximum Depth (ft) 1.22 1.08 1.22
width/Depth Ratio 29.46 18.96 10.94
Bankfull Area (sq ft) 10.3 5.36 4.94
wetted Perimeter (ft) 17.57 11.19 8.54
Hydraulic Radius (ft) 0.59 0.48 0.58
Begin BKF Station 63.64 63.64 73.69
Page 1
XS5 RIF YRO.tXt
End BKF Station 81.02 73.69 81.02
---------------------------------------------------------------
Entrainment calculations
---------------------------------------------------------------
Entrainment Formula: Rosgen modified shields curve
channel Left side Right side
Slope 0.02122 0 0
shear Stress (lb/sq ft) 0.78
Movable Particle (mm) 126.8
•
•
Page 2
X56 POOL YRO.tXt
RIVERMORPH CROSS SECTION SUMMARY
•
11

River Name: Davis Branch
Reach Name: Davis Branch Mainstem As-Built
cross section Name: XS6 MS POOL YRO
Survey Date: 05/05/2009
Cross section Data Entry
BM Elevation: 0 ft
Backsight Rod Reading: 0 ft
TAPE
---------- FS
------------- ELEV
----------------- NOTE
----------------
0 0 434.42 left mon 1
8.14 0 433.79 FP
18.69 0 432.43 FP
49.18 0 431.6 FP
66.82 0 431.46 FP
78.86 0 430.33 BKF LB
82.21 0 428.58 LEw
84.61 0 428.05 TWO.59 p
88.02 0 428.6 REw
90.35 0 430.23 RB
94.33 0 431.47 FP
105.28 0 433.13 FP
115.44 0 435.01 right mon 2
Cross Sectional Geometry
---------------------------------------------------------------
Channel Left Right
Floodprone Elevation (ft) 432.61 432.61 432.61
Bankfull Elevation (ft) 430.33 430.33 430.33
Floodprone width (ft) 84.56 ----- -----
Bankfull width (ft) 11.81 5.84 5.97
Entrenchment Ratio 7.16 ----- -----
Mean Depth (ft) 1.42 1.37 1.47
Maximum Depth (ft) 2.28 2.28 2.27
width/Depth Ratio 8.32 4.26 4.06
Bankfull Area (sq ft) 16.75 7.97 8.78
wetted Perimeter (ft) 12.87 8.59 8.81
Hydraulic Radius (ft) 1.3 0.93 1
Begin BKF station 78.86 78.86 84.7
Page 1
XS6 POOL YRO.tXt
End BKF Station 90.67 84.7 90.67
---------------------------------------------------------------
Entrainment calculations
---------------------------------------------------------------
Entrainment Formula: Rosgen modified shields curve
channel Left Side Right side
slope 0.02122 0 0
shear stress (lb/sq ft) 1.72
Movable Particle (mm) 226.7
is

Page 2
XS7 RIF YRO.txt
RIVERMORPH CROSS SECTION SUMMARY
C?
River Name: Davis Branch
Reach Name: Davis Branch Mainstem As-Built
cross section Name: XS7 MS RIF YRO
Survey Date: 05/05/2009
Cross Section Data Entry
BM Elevation: 0 ft
Backsight Rod Reading: 0 ft
TAPE
---------- FS
-------------- ELEV
---------------- NOTE
-----------------------
0 0 434.42 left mon 1
7.3 0 433.88 FP
17.55 0 432.82 FP
51.03 0 431.29 FP
72.96 0 430.25 FP
80.98
90.13 0
0 430.25
428.94 BKF LB
Tw0.00 r
96.21 0 430.13 RB
105.25 0 431.6 FP
124.06 0 433.75 right mon 2
Cross sectional Geometry
---------------------------------------------------------------
Channel Left Right
Floodprone Elevation (ft) 431.56 431.56 431.56
Bankfull Elevation (ft) 430.25 430.25 430.25
Floodprone width (ft) 59.88 ----- -----
Bankfull width (ft) 15.97 7.98 7.99
Entrenchment Ratio 3.75 ----- -----
Mean Depth (ft) 0.65 0.57 0.73
Maximum Depth (ft) 1.31 1.14 1.31
width/Depth Ratio 24.57 14 10.95
Bankfull Area (sq ft) 10.38 4.56 5.83
wetted Perimeter (ft) 16.19 9.2 9.27
Hydraulic Radius (ft) 0.64 0.5 0.63
Be
in BKF Station 80.98 80.98 88.96
g
40 EnBKF Station 96.95 88.96 96.95
---------------------------------------------------------------
Page 1
XS7 RIF YRO.txt
Entrainment calculations
---------------------------------------------------------------
Entrainment Formula: Rosgen Modified Shields Curve
Channel Left Side Right side
Slope 0.02122 0. 0
shear stress (lb/sq ft) 0.85
Movable Particle (mm) 134.6
•
•
Page 2
X58 RIF YRO.tXt
RIVERMORPH CROSS SECTION SUMMARY
•
•
•
River Name: Davis Branch
Reach Name: UT1 Restoration Reach As-Built
cross section Name: XS8 UT1 RIF YRO - ROCK SILL
Survey Date: 05/05/2009
-------------
Cross section --------------
Data Entry ------------- -----------------------
BM Elevation: 0 ft
Backsight Rod Reading: 0 ft
TAPE
-------------- FS
------------- ELEV
------------- NOTE
-----------------------
0 0 453.09 left mon 1
10.96 0 450.44 FP
22.47 0 448.9 FP
33.14 0 447.76 FP
45.58 0 448.16 FP
65.8 0 446.65 LB
70.84 0 445.93 TWO.00 rs
75.3 0 446.88 BKF RB
81.82 0 447.21 FP
87.37 0 446.45 FP
101.9 0 448.4 FP
128.24 0 452.64 right mon 2
Cross sectional Geometry
---------------------------------------------------------------
Floodprone Elevation (ft)
Bankfull Elevation (ft)
Floodprone width (ft)
Bankfull width (ft)
Entrenchment Ratio
Mean Depth (ft)
Maximum Depth (ft)
width/Depth Ratio
Bankful1 Area (sq ft)
wetted Perimeter (ft)
Hydraulic Radius (ft)
Begin BKF Station
En BKF Station
channel
447.83
446.88
50.49
12.58
4.01
0.43
0.95
29.26
5.45
12.74
0.43
62.72
75.3
Page 1
Left
447.83
446.88
9.46
0.47
0.95
20.13
4.41
10.21
0.43
62.72
72.18
Right
447.83
446.88
3.12
0.33
0.66
9.45
1.04
3.85
0.27
72.18
75.3
X58 RIF YRO.tXt
---------------------------------------------------------------
Entrainment calculations
---------------------------------------------------------------
Entrainment Formula: Rosgen modified shields curve
Channel Left side Right side
slope 0.0207 0 0
shear stress (lb/sq ft) 0.56
Movable Particle (mm) 98.6

i
Page 2
XS9 RIF YRO.txt
RIVERMORPH CROSS SECTION SUMMARY

•
•
River Name: Davis Branch
Reach Name: UT1 Restoration Reach As-Built
cross section Name: XS9 UT1 RIF YRO
Survey Date: 05/05/2009
-------------
Cross section --------------
Data Entry ------------- -----------------------
BM Elevation: 0 ft
Backsight Rod Reading: 0 ft
TAPE
-------------- FS
------------- ELEV
------------- NOTE
-----------------------
0 0 442.65 left mon 1
15.31 0 440.55 FP
33.7 0 439.29 FP
42.02 0 439.08 BKF LB
46.26 0 438.06 TWO.00 r
49.69 0 438.77 RB
57.25 0 439.29 FP
79 0 439.99 FP
94.72 0 442.78 right mon 2
Cross Sectional Geometry
---------------------------------------------------------------
Channel Left Right
Floodprone Elevation (ft) 440.1 440.1 440.1
Bankfull Elevation (ft) 439.08 439.08 439.08
Floodprone width (ft) 57.74 ----- -----
Bankfull width (ft) 12.18 4.48 7.7
Entrenchment Ratio 4.74 ----- -----
Mean Depth (ft) 0.42 0.54 0.36
Maximum Depth (ft) 1.02 1.02 0.97
width/Depth Ratio 29 8.3 21.39
Bankfull Area (sq ft) 5.14 2.4 2.74
wetted Perimeter (ft) 12.38 5.58 8.75
Hydraulic Radius (ft) 0.42 0.43 0.31
Begin BKF Station 42.02 42.02 46.5
End BKF Station 54.2 46.5 54.2
Page 1
XS9 RIF YRO.tXt
Entrainment calculations
---------------------------------------------------------------
Entrainment Formula: Rosgen modified shields curve
channel Left side Right side
slope 0.02021 0 0
shear stress (lb/sq ft) 0.53
Movable Particle (mm) 95.3
•
U
Page 2
Davis Branch Mainstem Enhancement I and Restoration Reach
Table 3a: "As-Built" Predicted Annual Bank Erosion Rates
0
•
•
Davis Branch Enhancement I Reach
Bank Identification Summa
Bank Name
I XS7 Riffle MS BEHI
2 XS6 Pool MS BEHI
3 XS5 Riffle MS BEHI
Davis Branch Mainstem Enhancement Level 1 Reach: Predi cted Annual Bank Erosion Rates

Bank BEHI
Numeric
Rating BEHI
Adjective
Rating NBS
Adjective
Rating
Length
ft
Loss
cu ds/ r
Loss
tons/ r
1 18.1 Low Very Low 451 0.37 0.48
2 27.1 Moderate Very Low 387 2.05 2.67
3 16.7 Low Very Low 451 0.41 0.53
Totals 1,289 2.83 3.68
Total Reac h Length = 1,289 I.f. Total Loss per foot of Reach = 0.0029 tons/yr
Davis Branch Restoration Reach
Bank Identification Summary
Bank Name
I XS 1 Riffle MS BEHI
2 XS2 Pool MS BEHI
3 XS3 Riffle MS BEHI
4 XS4 Pool MS BEHI
Davis Branch Mainstem Priority Level I/II Restoration Reach: Predicted Annual Bank Erosion Rates
Bank BEHI
Numeric
Ratin R Adec Length
ft Loss
cu ds/ r Loss
tons/ r
1 15.2 j E 450 0.25 0.33
2 19.7 449 0.6 0.78
3 18.4 450 0.46 0.6
4 20.3 450 1.57 2.04
Totals 1799 2.88 3.75
Total Reac h Length = 1,7991.f. Total Loss per foot of Reach = 0.0021 tons/ r
Davis Branch Mainstem Reach
Bank Identification Summa
Bank Name
1 XS7 Riffle El BEHI
2 XS6 Pool El BEHI
3 XS5 Riffle El BEHI
4 XSI Riffle PMI BEHI
5 XS2 Pool PUII BEHI
6 XS3 Riffle PUB BEHI
7 XS4 Pool PUII BEHI
Davis Branch Mainstem El & P UII Restoration Reach: Pred icted Annual Bank Erosion Rates

Bank BEHI
Numeric
Rating BEHI
Adjective
Ratin NBS
Adjective
Rating
Length
ft
Loss
cu ds/ r
Loss
tons/ r
1 18.1 Low Very Low 451 0.37 0.48
2 27.1 Moderate Very Low 387 2.05 2.67
3 16.7 Low Very Low 451 0.35 0.45
4 15.2 Low -Very Low 450 0.25 0.33
5 19.7 Low Very Low 449 0.6 0.78
6 18.4 Low Very Low 450 0.46 0.6
7 20.3 Moderate Very Low 450 1.57 2.04
Totals 3,088 5.65 7.35
Total Reach Length = 3,0881.f. Total Loss per foot of Reach = 0.0024 tons/ r
Davis Branch Restoration Reach
Table 3b: "As-Built" Predicted Annual Bank Erosion Rates
•
•
UTI Enhancement Level II Reach
Bank Identification Summary
Bank Name
1 XS8 Riffle Ell Reach BEHI
Davis Branch Mainstem Enhancement Leve l 1 Reach: Pred icted Annual Bank Erosion Rates

Bank BEHI
Numeric
Rating BEHI
Adjective
Rating NBS
Adjective
Rating
Length
ft
Loss
cu ds/ r
Loss
tons/ r
1 15.6 Low Very Low 396 0.24 0.31
Totals 396 0.24 0.31
Total Reach Length = 396 l.f. Total Loss per f oot of Reach = 0.0008 tons/yr
UTl Restoration Reach
Bank Identification Summary
Bank Name
2 XS9 Riffle P1 Reach BEHI
Davis Branch UTI Priority Level I Restoration Reach: Pred icted Annual Bank Erosion R ates

Bank BEHI
Numeric
Rating BEHI
Adjective
Rating NBS
Adjective
Rating
Length
ft
Loss
cu ds/ r
Loss
tons/ r
2 16.0 Low Very Low 459 0.29 0.38
Totals 459 0.29 0.38
Total Reach Length = 459 11. Total Loss per f oot of Reach = 0.0008 tons/yr
Davis Branch UTI
Bank Identification Summa
Bank Name
1 XS8 Riffle Ell Reach BEHI
2 XS9 Riffle Pl Reach BEHI
Davis Branch UT1 Enhancement II & Restoration Reaches: Predicted Annual Bank Erosion Rates

Bank BEHI
Numeric
Rating BEHI
Adjective
Rating NBS
Adjective
Rating
Length
ft
Loss
cu ds/ r
Loss
tons/ r
1 15.6 Low Very Low 396 0.37 0.48

2 16.0 Low Ve Low 459 1.57 2.04
b!
als 855 0.53 0.69
0
tal Reach Length = 855 l.f. Total Loss per f oot of Reach = 0.0008 tons/ r
0
Davis Branch and UTl Project Summary
Table 3c: "As-Built" Predicted Annual Bank Erosion Rates
•
•
Davis Branch Project Summary
Bank Identification Summary
Bank Name
1 XS7 Riffle MS El BEHI
2 XS6 Pool MS El BEHI
3 XS5 Riffle MS El BEHI
4 XS 1 Riffle MS PUII BEHI
5 XS2 Pool MS PUII BEHI
6 XS3 Riffle MS PUII BEHI
7 XS4 Pool MS PUII BEHI
8 XS8 Riffle UT1 EII BEHI
9 XS9 Riffle UT1 PI BEHI
Davis Branch & UTl Project Summary: Predicted Annual Bank Erosion Rates

Bank BEHI
Numeric
Rating BEHI
Adjective
Rating NBS
Adjective
Rating
Length
ft
Loss
cu ds/ r
Loss
tons/ r
1 18.1 Low Very Low 451 0.37 0.48
2 27.1 Moderate Very Low 387 2.05 2.67
3 16.7 Low Very Low 451 0.35 0.45
4 15.2 Low Very Low 450 0.25 0.33
5 19.7 Low Very Low 449 0.6 0.78
6 18.4 Low Very Low 450 0.46 0.6
7 20.3 Moderate Very Low 450 1.57 2.04
8 15.6 Low Very Low 396 0.37 0.48
9 16 Low Very Low 459 1.57 2.04
Totals 3,943 7.59 9.87
Total Reach Length = 3,943 l.f. Total Loss per foot of Reach = 0.0025 tons/yr
0
MS P1&2 + E1 Reach BEHI Summary.txt
RIVERMORPH BEHI SUMMARY REPORT
•
•
•
River Name: Davis Branch
Reach Name: Davis Branch Mainstem As-Built
---------------------------------------------------------------
Table 1. Bank Identification Summary
Bank
1
2
3
4
5
6
7
Name
XS7 Riffle MS BEHI
XS6 Pool MS BEHI
XS5 Riffle MS BEHI
XS1 Riffle MS BEHI
XS2 Pool MS BEHI
XS3 Riffle MS BEHI
XS4 Pool MS BEHI
---------------------------------------------------------------
Table 2. Predicted Annual Bank Erosion Rates
BEHI BEHI NBS
Numeric Adjective Adjective
Bank Rating Rating Rating
1 18.1 Low Very LOW
2 27.1 Moderate very LOW
3 16.7 LOW very LOW
4 15.2 LOW very LOW
5 19.7 LOW very LOW
6 18.4 LOW Very LOW
7 20.3 Moderate very LOW
Totals
Total Reach Ln: 3088
0.0024
Length Loss Loss
ft cu yds/yr tons/yr
451 0.37 0.48
387 2.05 2.67
451 0.35 0.45
450 0.25 0.33
449 0.6 0.78
450 0.46 0.6
450 1.57 2.04
3088
5.65 7.35
Total Loss (tons/yr) per ft of Reach:
Page 1
•
0
u
XS1 Riffle MS BEHI Summary Report.txt
RIVERMORPH BANK EROSION HARZARD INDEX (BEHI)
River Name: Davis Branch
Reach Name: Davis Branch Mainstem As-Built
BEHI Name: XS1 Riffle MS BEHI
Survey Date: 05/05/2009
Bankfull Height: 0.87 ft
Bank Height: 0.87 ft
Root Depth: 0.5 ft
Root Density: 25 %
Bank Angle: 10.9 Degrees
Surface Protection: 95 %
Bank Material Adjustment: Silt/Clay 0
Bank Stratification Adjustment: None 0
Erosion Loss Curve: Colorado
NBS Method #7: vertical velocity Near-Bank shear stress method
velocity at Surface: 3.74 fps
Depth: 0.87 ft
Bankfull slope: 0.01304
lb/sq/ft
NB Shear stress: 0.15 lb/sq/ft
velocity at Bed: 3.5 fps
Hydraulic Radius: 0.43 ft
shear stress: 0.35
Shear Ratio: 0.42
BEHI Numerical Rating: 15.2
BEHI Adjective Rating: Low
NBS Numerical Rating: 0.42
NBS Adjective Rating: Very Low
Total Bank Length: 450 ft
Estimated Sediment Loss: 0.25 Cu Yds per Year
Estimated Sediment Loss: 0.33 Tons per Year
Page 1
•
•
•
XS2 Pool MS BEHI Summary Report.txt
RIVERMORPH BANK EROSION HARZARD INDEX (BEHI)
River Name: Davis Branch
Reach Name: Davis Branch Mainstem As-Built
BEHI Name: XS2 Pool MS BEHI
Survey Date: 05/05/2009
Bankfull Height: 2.11 ft
Bank Height: 2.11 ft
Root Depth: 0.5 ft
Root Density: 25 %
Bank Angle: 19.7 Degrees
Surface Protection: 95 %
Bank Material Adjustment: Silt/Clay 0
Bank Stratification Adjustment: None 0
Erosion Loss Curve: Colorado
NBS Method #7: vertical velocity Near-Bank Shear Stress method
velocity at surface: 3.74 fps
Depth: 2.11 ft
Bankfull slope: 0.01304
lb/sq/ft
NB Shear Stress: 0.67 lb/sq/ft
velocity at Bed: 2.5 fps
Hydraulic Radius: 0.99 ft
Shear Stress: 0.81
Shear Ratio: 0.83
BEHI Numerical Rating: 19.7
BEHI Adjective Rating: Low
NBS Numerical Rating: 0.83
NBS Adjective Rating: very Low
Total Bank Length: 449 ft
Estimated sediment Loss: 0.6 Cu Yds per Year
Estimated Sediment Loss: 0.78 Tons per Year
Page 1
XS3 Riffle MS BEHI Summary Report.txt
RIVERMORPH BANK EROSION HARZARD INDEX (BEHI)
•
•
•
River Name: Davis Branch
Reach Name: Davis Branch Mainstem As-Built
BEHI Name: XS3 Riffle MS BEHI
Survey Date: 05/05/2009
Bankfull Height: 1.62 ft
Bank Height: 1.62 ft
Root Depth: 0.5 ft
Root Density: 25 %
Bank Angle: 15.6 Degrees
Surface Protection: 95 %
Bank Material Adjustment: Silt/Clay 0
Bank Stratification Adjustment: None 0
Erosion Loss Curve: Colorado
NBS Method #7: vertical velocity Near-Bank Shear Stress method
velocity at Surface: 3.74 fps
Depth: 1.62 ft
Bankfull slope: 0.01304
lb/sq/ft
NB Shear Stress: 0.04 lb/sq/ft
velocity at Bed: 3.5 fps
Hydraulic Radius: 0.72 ft
Shear Stress: 0.59
Shear Ratio: 0.07
BEHI Numerical Rating: 18.4
BEHI Adjective Rating: Low
NBS Numerical Rating: 0.07
NBS Adjective Rating: Very Low
Total Bank Length: 450 ft
Estimated sediment Loss: 0.46 Cu Yds per Year
Estimated sediment Loss: 0.6 Tons per Year
Page 1
X54 Pool MS BEHI Summary Report.txt
RIVERMORPH BANK EROSION HARZARD INDEX (BEHI)
•
u
•
River Name: Davis Branch
Reach Name: Davis Branch Mainstem As-Built
BEHI Name: XS4 Pool MS BEHI
Survey Date: 05/05/2009
Bankfull Height: 2.24 ft
Bank Height: 2.24 ft
Root Depth: 0.5 ft
Root Density: 25 %
Bank Angle: 24.7 Degrees
Surface Protection: 95 %
Bank Material Adjustment: Silt/Clay 0
Bank stratification Adjustment: None 0
Erosion Loss Curve: Colorado
NBS Method #7: vertical velocity Near-Bank Shear Stress method
velocity at Surface: 3.74 fps
Depth: 2.24 ft
Bankfull slope: 0.01304
lb/sq/ft
NB Shear Stress: 0.59 lb/sq/ft
velocity at Bed: 2.5 fps
H draulic Radius: 0.85 ft
Shear Stress: 0.69
Shear Ratio: 0.86
BEHI Numerical Rating: 20.3
BEHI Adjective Rating: Moderate
NBS Numerical Rating: 0.86
NBS Adjective Rating: very Low
Total Bank Length: 450 ft
Estimated Sediment Loss: 1.57 Cu Yds per Year
Estimated Sediment Loss: 2.04 Tons per Year
Page 1
E1 Reach Erosion Rate Summary.txt
RIVERMORPH BEHI SUMMARY REPORT
•

River Name: Davis Branch
Reach Name: Davis Branch Mainstem As-Built
---------------------------------------------------------------
Table 1. Bank identification summary
Bank Name
1 XS7 Riffle MS BEHI
2 xS6 POOL MS BEHI
3 x55 Riffle MS BEHI
---------------------------------------------------------------
Table 2. Predicted Annual Bank Erosion Rates
BEHI BEHI NBS
Numeric Adjective Adjective
Bank Rating Rating Rating
1 18.1 Low Very Low
2 27.1 Moderate very Low
3 16.7 Low very Low
Totals
Total Reach Ln: 1289
0.0029
Length LOSS LOSS
ft cu yds/yr tons/yr
451 0.37 0.48
387 2.05 2.67
451 0.41 0.53
1289 2.83 3.68
Total Loss (tons/yr) per ft of Reach:
Page 1
XS5 BEHI Summary Report.txt
RIVERMORPH BANK EROSION HARZARD INDEX (BEHI)

u
•
River Name: Davis Branch
Reach Name: Davis Branch Mainstem As-Built
BEHI Name: Xs5 Riffle MS BEHI
survey Date: 05/05/2009
Bankfull Height: 1.22 ft
Bank Height: 1.22 ft
Root Depth: 0.5 ft
Root Density: 25 %
Bank Angle: 6.2 Degrees
surface Protection: 95 %
Bank Material Adjustment: silt/Clay 0
Bank Stratification Adjustment: None 0
Erosion Loss Curve: Colorado
NBS Method #7: vertical velocity Near-Bank shear Stress method
velocity at surface: 4.38 fps
Depth: 1.22 ft
Bankfull slope: 0.02122
lb/sq/ft
NB Shear stress: 0.10 lb/sq/ft
velocity at Bed: 4.1 fps
Hydraulic Radius: 0.59 ft
Shear Stress: 0.78
Shear Ratio: 0.13
BEHI Numerical Rating: 16.7
BEHI Adjective Rating: Low
NBS Numerical Rating: 0.13
NBS Adjective Rating: very Low
Total Bank Length: 451 ft
Estimated sediment Loss: 0.35 Cu Yds per Year
Estimated sediment Loss: 0.45 Tons per Year
Page 1
XS6 BEHI Summary Report.txt
RIVERMORPH BANK EROSION HARZARD INDEX (BEHI)
C7
•
E
River Name: Davis Branch
Reach Name: Davis Branch Mainstem As-Built
BEHI Name: XS6 Pool MS BEHI
Survey Date: 05/05/2009
Bankfull Height: 2.28 ft
Bank Height: 3.41 ft
Root Depth: 0.5 ft
Root Density: 25 %
Bank Angle: 21.6 Degrees
Surface Protection: 95 %
Bank Material Adjustment: Silt/Clay 0
Bank Stratification Adjustment: None 0
Erosion Loss Curve: Colorado
NBS Method #7: vertical velocity Near-Bank Shear Stress method
velocity at surface: 4.38 fps
Depth: 2.28 ft
Bankfull slope: 0.02122
1 b/sq/ft
NB shear Stress: 0.03 lb/sq/ft
velocity at Bed: 4.1 fps
Hydraulic Radius: 1.3 ft
Shear Stress: 1.72
Shear Ratio: 0.02
BEHI Numerical Rating: 27.1
BEHI Adjective Rating: Moderate
NBS Numerical Rating: 0.02
NBS Adjective Rating: Very Low
Total Bank Length: 387 ft
Estimated Sediment Loss: 2.05 Cu Yds per Year
Estimated Sediment Loss: 2.67 Tons per Year
Page 1
•
•
C,
XS-7 BEHI Summary Report.txt
RIVERMORPH BANK EROSION HARZARD INDEX (BEHI)
River Name: Davis Branch
Reach Name: Davis Branch Mainstem As-Built
BEHI Name: XS7 Riffle MS BEHI
Survey Date: 06/18/2009
Bankfull Height: 1.31 ft
Bank Height: 1.31 ft
Root Depth: 0.5 ft
Root Density: 25 %
Bank Angle: 26.6 Degrees
Surface Protection: 95 %
Bank Material Adjustment: silt/Clay 0
Bank Stratification Adjustment: None 0
Erosion Loss Curve: Colorado
NBS Method #7: vertical velocity Near-Bank Shear Stress method
velocity at surface: 4.38 fps
Depth: 1.31 ft
Bankfull slope: 0.02122
lb/sq/ft
NB Shear Stress: 0.09 lb/sq/ft
velocity at Bed: 4.1 fps
Hydraulic Radius: 0.64 ft
Shear Stress: 0.85
Shear Ratio: 0.10
BEHI Numerical Rating: 18.1
BEHI Adjective Rating: Low
NBS Numerical Rating: 0.10
NBS Adjective Rating: very Low
Total Bank Length: 451 ft
Estimated Sediment Loss: 0.37 Cu Yds per Year
Estimated Sediment Loss: 0.48 Tons per Year
Page 1
EII Reach BEHI Summary Report.txt
RIVERMORPH BEHI SUMMARY REPORT
•
River Name: Davis Branch
Reach Name: UT1 Restoration Reach As-Built
---------------------------------------------------------------
Table 1. Bank Identification Summary
Bank Name
1 XS-8 UT1 EII Reach BEHI
---------------------------------------------------------------
Table 2. Predicted Annual Bank Erosion Rates
BEHI BEHI NBS
Numeric Adjective Adjective Length Loss Loss
Bank Rating Rating Rating ft cu yds/yr tons/yr
1 15.6 Low Very Low 396 0.24 0.31
Totals 396 0.24 0.31
Total Reach Ln: 396 Total Loss (tons/yr) per ft of Reach:
0.0008
•
Page 1
XS8 BEHI Summary Report.txt
RIVERMORPH BANK EROSION HARZARD INDEX (BEHI)
•

C7
River Name: Davis Branch
Reach Name: UT1 Restoration Reach As-Built
BEHI Name: XS-8 UT1 EII Reach BEHI
Survey Date: 05/05/2009
Bankfull Height: 0.95 ft
Bank Height: 0.95 ft
Root Depth: 0.5 ft
Root Density: 25 %
Bank Angle: 12 Degrees
Surface Protection: 95 %
Bank Material Adjustment: Silt/Clay 0
Bank Stratification Adjustment: None 0
Erosion Loss Curve: Colorado
NBS Method #7: vertical velocity Near-Bank shear stress method
velocity at Surface: 2.73 fps
Depth: 0.95 ft
Bankfull slope: 0.0207
lb/sq/ft
NB shear Stress: 0.11 lb/sq/ft
velocity at Bed: 2.5 fps
Hydraulic Radius: 0.43 ft
Shear Stress: 0.56
Shear Ratio: 0.20
BEHI Numerical Rating: 15.6
BEHI Adjective Rating: Low
NBS Numerical Rating: 0.20
NBS Adjective Rating: very Low
Total Bank Length: 396 ft
Estimated Sediment Loss: 0.24 Cu Yds per Year
Estimated Sediment Loss: 0.31 Tons per Year
Page 1
UT1 EII & PI Reach BEHI Summary.txt
RIVERMORPH BEHI SUMMARY REPORT
0
•
•
River Name: Davis Branch
Reach Name: UT1 Restoration Reach As-Built
---------------------------------------------------------------
Table 1. Bank Identification Summary
Bank Name
1 XS-8 UT1 EII Reach BEHI
2 XS9 UT1 PI Reach BEHI
---------------------------------------------------------------
Table 2. Predicted Annual Bank Erosion Rates
BEHI BEHI NBS
Numeric Adjective Adjective
Bank Rating Rating Rating
1 15.6 Low Very Low
2 16 Low Very Low
Length Loss Loss
ft cu yds/yr tons/yr
396 0.24 0.31
459 0.29 0.38
Totals
855 0.53 0.69
Total Reach Ln: 855 Total Loss (tons/yr) per ft of Reach:
0.0008
Page 1
XS9 UT1 PI BEHI Summary Report.txt
RIVERMORPH BANK EROSION HARZARD INDEX (BEHI)

•
•
River Name: Davis Branch
Reach Name: UT1 Restoration Reach As-Built
BEHI Name: XS9 UT1 PI Reach BEHI
Survey Date: 05/05/2009
Bankful l Height: 1.02 ft
Bank Height: 1.02 ft
Root Depth: 0.5 ft
Root Density: 25 %
Bank Angle: 13.5 Degrees
Surface Protection: 95 %
Bank Material Adjustment: Silt/Clay 0
Bank Stratification Adjustment: None 0
Erosion Loss Curve: Colorado
NBS Method #7: vertical velocity Near-Bank Shear Stress method
velocity at Surface: 2.14 fps
Depth: 1.02 ft
Bankfull Slope: 0.02021
lb/sq/ft
NB Shear Stress: 0.04 lb/sq/ft
velocity at Bed: 2 fps
Hydraulic Radius: 0.42 ft
Shear Stress: 0.53
Shear Ratio: 0.07
BEHI Numerical Rating: 16.0
BEHI Adjective Rating: Low
NBS Numerical Rating: 0.07
NBS Adjective Rating: Very Low
Total Bank Length: 459 ft
Estimated Sediment Loss: 0.29 Cu Yds per Year
Estimated Sediment Loss: 0.38 Tons per Year
Page 1
01
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