20140332 Ver 1_Staff Notes_20141107

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UT to Haw River, Riffle
1005
100
99.5 _ —
99 – --
198.5 - -- –
w 98 -- - -- - -�–
97.5 – - - - -- — – - --
97 V"
96.5
0
2
Bankfull
Dimensions
97
x- section area (ft sq )
7 3
'width (ft)
1 3
mean depth (ft)
1 6
max depth (ft)
89
wetted parimeter (ft)
1 1
hyd radi (ft)
5.5
'width -depth ratio
Bankfull
Flow
- --
velocity (tys)
- --
discharge rate (cis)
- --
Froude number
4 6 8
Width
Flood Dimensions
12.0 _W flood prone area (ft)
16 entrenchment ratio
30 low bank height (ft)
1 9 low bank height ratio
Flow Resistance
- -- Manning's roughness
- -- : D'Arcy- Weisbach fnc
- -- resistance factor Wu'
- -- relative roughness
X53. Taken at location shown in Photo 2. Note BHR of 1 q
10 12 14
Materials
- -- D50 (mn)
- -- D84 (mm)
- -- threshold grain size (mm):
Forces 8 Power
--- channel slope (1/6)
- -- �shear stress (IWsgft)
- -- shear velocity (ft1s)
-- unit strm power (II> Vs)
Photo 3. Bankfull and top of bank at similar elevations as preceding locations. Note mass wasting of bank at lower
portion of photograph (in front of tape measure at water level).

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Ur to Haw River, Riffle
100.5
100 r
99.5 — �-
I
99 - -
o
-
w 98
97.5
97 - - —
96.5
0 2 4
Bankfull Dimensions
12.0 x- section area (ft.sq.)
10.8 width (ft)
1.1 mean depth (ft)
1.6 max depth (ft)
11.7 wetted parameter (ft)
1.0 hyd radi (ft)
9.7 width -depth ratio
Bankfull Flow
velocity (ft/s)
discharge rate (cfs)
Froude number
6
8 10
Width
Flood Dimensions
15.7 W flood prone area (ft)
1.5 entrenchment ratio
29 low bank height (ft)
1 8 low bank height ratio
Flow Resistance
- -- Manning's roughness
- -- D'Arcy- Wetsbach fric
- -- resistance factor u /u'
- -- relative roughness
12 14 16
Materials
- -- D50 (mm)
--- D84 (mm)
- -- threshold grain size (mm)-
Forces & Power
- -- channel slope ( %)
shear stress (lb/sq.ft.)
- -- shear velocity (fUs)
- -- "unit strm power (lblfUS)
18
XS4. Taken along spoil piles beyond right bank. Re- establishing wetlands in this area will not be feasible without
raising the channel bed.
ire
Stream
Type
BKF Area
BKF Width
BKF
Depth
1
Max BKF
De
W/D
BH Ratio
ER
BKF Elev
TOB Elev
1
Riffle
Bc
13.2
11.81
1.11
2.19
1 10.6
2 -1
1 2
766.45
768.87
770
769
c 768
767
d
w 766
765
764
/ ----------- -- -- - - --
-----------
0 20 40 60 80 100 120
Station - - - -0- -- Bankfull 0- Floodprone
X -R2. Taken at proposal stage. Bankfull area probably slightly lower based on cross sections of additional bankfull
features recorded around Browns Summit site.
CrossSection X -R2

Browns Summit Creek Site Bankfull Area - sf
Cross Section
DA ac
DA s mi
Piedmont
Regional
Piedmont
Revised
Field
Measured
Indicator
XS1
185
0.289
9.3
6.6
7.4
bench
XS2
185
0.289
9.3
6.6
7.7
bench
XS3
242
0.378
11.1
8.0
9.7 est.
no indicator
XS4
301
0.470
12.9
9.3
12 est.
no indicator
R1
435
0.680
16.5
12.0
16.2
TOB
Generally, the bankfull area at Browns Summit appears to be slightly below the
published Piedmont regional curve estimate but above the revised regional curve (Alan
Walker).

MIMI
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Michael Baker
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