Transcript Slide 1

Base Flow Indices and their
Relation to Physiography in
Ontario
A. Singh, R.P. Rudra, W.T. Dickinson, B. Gharabaghi,
and R. Sharma
CSBE Annual Meeting, July 2008
Corresponding Author: A. Singh
([email protected])
05/27/1993
0.6
05/20/1993
0.7
05/13/1993
05/06/1993
04/29/1993
04/22/1993
04/15/1993
04/08/1993
04/01/1993
Flow (m3/s)
Streamflow Components
StreamFLow
RapidResponse(SRO)
SlowResponse (BaseFlow)
0.5
0.4
0.3
0.2
0.1
0
Objectives
 Development of a tool separating slow and rapid
responses from the total stream flow and
calculating Base Flow Index (BFI)
 Application of the developed tool to various
watersheds representing variety of physiographic
features
What is Base Flow Index (BFI)
 Ratio for base flow and stream flow
BaseFlow
BFI 
StreamFlow
Why Essential
 Characterization of watershed
 Rapid
flow dominance:
Lower permeability/steeper slopes
 Slow
response dominance:
Higher permeability/flatter slopes
Canagagigue Creek Watershed
Permeability
East and West Branches
BFI
Total
East
West
0.6
0.71
0.49
Canagagigue Creek
Watershed
Point of Merger of two Tributaries
Tributary draining
wetland side
Source: Wayne Jenkinson (UOW)
Tributary draining
non-wetland side
Response Separation Methods
 Digital Filter Method
 Modified UKIH (UK Institute of Hydrology) Method
 Base Sliding Method
 Fixed Base Method
 Local Minimum Method
 PART Method
Response Separation Software
Variability in BFI Estimation
Digital
Filter
PART
UKIH
Base
Local
Minimum
0.27
0.30
0.47
0.50
Base
Sliding
Base
Fixed
0.58
0.58
?? Which one is correct ??
45
40
35
30
obsFlow
bFlowDigital
25
bFlowSliding
bFlowPart
bFlowBaseFixed
20
bFlowBaseLocalMin
bFlowUKIH
15
10
5
0
08-Feb-84
28-Feb-84
19-Mar-84
08-Apr-84
28-Apr-84
18-May-84
07-Jun-84
Study Watersheds
Geographic Location of Siltes
CA
Creek
Gauge No
Lower
Thames
McGregory
02GE007
Grand River
Canagagigue
02GA036
Ganaraska
Wilmot
02HD009
Credit
Valley
Credit River
02HB002
Mississippi
Mississippi
02KF006
Maitland
Southmaitland
02FE009
Credit River
Credit_ph.shp
Guelph drumlin field
Hillsburgh sandhills
Horseshoe moraines
Niagara Escarpment
Oak Ridges moraine
Peel plain
South slope
N
W
E
S
Lower Thames
N
Lthames_ph.shp
Bothwell sand plains
St. Clair clay plains
E
W
S
South Maitland
N
Maitland_ph.shp
Horseshoe moraines
Huron slope
Stratford till plain
E
W
S
Wilmot Creek
N
Ganaraska_ph.shp
Iroquois plain
Oak Ridges moraine
South slope
W
E
S
Monthly, Seasonal, and Annual BFI
02GE007
0.18
0.14
0.19
0.26
0.25
0.16
0.15
0.09
0.12
0.19
0.18
0.17
02HD009
0.54
0.46
0.38
0.56
0.70
0.73
0.75
0.73
0.71
0.76
0.67
0.64
02HB002
0.59
0.46
0.34
0.42
0.56
0.66
0.68
0.69
0.67
0.61
0.60
0.54
02KF009
0.86
0.86
0.78
0.57
0.67
0.75
0.77
0.83
0.82
0.75
0.75
0.81
02FE009
0.31
0.24
0.25
0.32
0.35
0.30
0.30
0.21
0.20
0.24
0.26
0.34
02GA035
EAST
BRANCH
CANAG
0.51
0.33
0.25
0.30
0.48
0.61
0.71
0.71
0.59
0.59
0.48
0.42
Winter
Spring
Summer
Fall
0.16
0.22
0.16
0.18
0.54
0.46
0.72
0.71
0.52
0.38
0.63
0.60
0.84
0.64
0.74
0.75
0.29
0.28
0.29
0.25
0.41
0.28
0.58
0.53
0.16
0.17
0.16
0.20
Annual
0.19
0.59
0.51
0.74
0.29
0.40
0.17
BFI
January
February
March
April
May
June
July
August
September
October
November
December
02GA036
WEST
BRANCH
CANAG
0.18
0.11
0.14
0.19
0.20
0.12
0.09
0.06
0.10
0.22
0.19
0.19
Well Conceived is Well Done
Thanks
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