shifts are applied by developing “v-diagrams”
DESCRIPTION
Channel Cross Section. Shifts are applied by developing “V-diagrams”. Recent Measurements. Measurements plotted on axes of V-diagram. Channel Cross Section. Here is what a v-diagram and its shift curve generally look like. Shift curve. Variable shift diagram. Shifts vary by STAGE and TIME. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Shifts are applied by developing “V-diagrams”](https://reader036.vdocuments.net/reader036/viewer/2022081515/56815b60550346895dc944b8/html5/thumbnails/1.jpg)
Channel Cross Section
Recent Measurements
2.0
2.2
2.4
2.6
2.8
3.0
3.2
-0.40 -0.35 -0.30 -0.25 -0.20
Site Number: 00000000 - Site Name: Rating Curve Exercise 5 - DD: 6 - Rating Number: 0000Shift: 06/16/1974 12:43
Sta
ge
Shift
Measurements plotted on axes of V-diagram
Shifts are applied by developing “V-diagrams”
![Page 2: Shifts are applied by developing “V-diagrams”](https://reader036.vdocuments.net/reader036/viewer/2022081515/56815b60550346895dc944b8/html5/thumbnails/2.jpg)
Channel Cross Section
Variable shift diagram
Shift curve
Here is what a v-diagram and its shift curve generally look like
![Page 3: Shifts are applied by developing “V-diagrams”](https://reader036.vdocuments.net/reader036/viewer/2022081515/56815b60550346895dc944b8/html5/thumbnails/3.jpg)
0.01
0.1
1
10
100
0.1 1 10 100 1000 10000Discharge, in cfs
Gag
e H
eigh
t - o
ffset
Variable shift diagram
0
1
2
3
4
5
6
7
-0.3 -0.1
Shift, in feet
Gag
e H
eigh
t
July 1Sept. 1
Shifts vary by STAGE and TIME
![Page 4: Shifts are applied by developing “V-diagrams”](https://reader036.vdocuments.net/reader036/viewer/2022081515/56815b60550346895dc944b8/html5/thumbnails/4.jpg)
0.01
0.1
1
10
100
0.1 1 10 100 1000 10000
Discharge, in cfs
Gag
e H
eigh
t - o
ffset
Variable shift diagram
0
1
2
3
4
5
6
7
-0.3 -0.1
Shift, in feet
Gag
e H
eigh
t
July 1Sept. 1
Meas. made 7/20and 8/15
Shifts should be faithful to the base rating
![Page 5: Shifts are applied by developing “V-diagrams”](https://reader036.vdocuments.net/reader036/viewer/2022081515/56815b60550346895dc944b8/html5/thumbnails/5.jpg)
GH Q Shift0.38 0.29 -0.24
0.4 0.39 -0.241.95 110 -0.15
6.5 3000 0.973.94 805 02.66 299 0
Recent Measurements Concrete
Control
Let’s follow an application of shifts at a site
![Page 6: Shifts are applied by developing “V-diagrams”](https://reader036.vdocuments.net/reader036/viewer/2022081515/56815b60550346895dc944b8/html5/thumbnails/6.jpg)
San Francisquito Creek
0.01
0.1
1
10
100
0.1 1 10 100 1000 10000Discharge, in cfs
Gag
e H
eigh
t - o
ffset
0
1
2
3
4
5
6
7
-1 -0.5 0 0.5 1
Shift, in feet
Gag
e H
eigh
t
1 2
3
46
2
3
4
6
5
1
5
It would be easy (but WRONG) to lump all measurements into one shift----
![Page 7: Shifts are applied by developing “V-diagrams”](https://reader036.vdocuments.net/reader036/viewer/2022081515/56815b60550346895dc944b8/html5/thumbnails/7.jpg)
0
1
2
3
4
5
6
7
-1 -0.5 0 0.5 1
Shift, in feet
Gag
e H
eigh
t
San Francisquito Creek
0.01
0.1
1
10
100
0.1 1 10 100 1000 10000
Discharge, in cfs
Gag
e H
eigh
t - o
ffset
Section Control
Channel Control
One shift doesn’t always work
![Page 8: Shifts are applied by developing “V-diagrams”](https://reader036.vdocuments.net/reader036/viewer/2022081515/56815b60550346895dc944b8/html5/thumbnails/8.jpg)
Date GH Q Shift09/20 0.38 0.29 -0.2411/15 0.4 0.39 -0.2402/10 1.95 110 -0.1502/20 6.5 3000 0.9703/05 3.94 805 003/10 2.66 299 0
You need to consider the hydrograph when applying shifts
![Page 9: Shifts are applied by developing “V-diagrams”](https://reader036.vdocuments.net/reader036/viewer/2022081515/56815b60550346895dc944b8/html5/thumbnails/9.jpg)
San Francisquito Creek
0.01
0.1
1
10
100
0.1 1 10 100 1000 10000
Discharge, in cfs
Gag
e H
eigh
t - o
ffset Section
Control
Channel Control
Algae growth?
Let’s see how all the available information
should be put together
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Channel Control
Upstream view of control at GH of 5.40 feet
Downstream view of control at GH of 6.25 feet
San Francisquito Creek
1
10
100
100 1000 10000
Discharge, in cfs
Gag
e H
eigh
t - o
ffset
Changes in the channel control caused the rating to shift
![Page 11: Shifts are applied by developing “V-diagrams”](https://reader036.vdocuments.net/reader036/viewer/2022081515/56815b60550346895dc944b8/html5/thumbnails/11.jpg)
San Francisquito Creek
0.01
0.1
1
10
100
0.1 1 10 100 1000 10000Discharge, in cfs
Gag
e H
eigh
t - o
ffset
0
2
4
6
8
10
12
-1 -0.5 0 0.5 1
Shift, in feet
Gag
e H
eigh
t
3
4
6
1
5
2
V-diagram representing channel
control
V-diagram representing section control
Measurements were used to define two shift curves
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0
2
4
6
8
10
12
-1 -0.5 0 0.5 1
Shift, in feet
Gag
e H
eigh
t
Effective from ???
Effective from ????
Shift application took the hydrograph into account
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X
X
X=Discharge Measurement
Prorate
Hold ScourFill
X
#1
#2 #3
Here is a generalized example of how shifts can be timed