MANN CREEK BURNT RIVER BROWNLEE RESERVOIR RESERVOIR (0.26) WEISER RIVER UNITY RESERVOIR (0.13) CRANE CREEK RESERVOIR CASCADE DEADWOOD RESERVOIR RESERVOIR (0.52)
PAYETTE RIVER BEULAH BULLY CREEK RESERVOIR RESERVOIR MALHEUR RIVER BLACK CANYON (0.15) RESERVOIR (0.16)
ARROWROCK RESERVOIR WARM SPRINGS BOISE RIVER (0.13) RESERVOIR SNAKE RIVER OWYHEE RIVER LUCKY PEAK RESERVOIR OWYHEE RESERVOIR ANDERSON RANCH RESERVOIR
SWAN FALLS RESERVOIR
Sediment Date Yield of Reservoir (ac-ft/mi2/yr) Measurement Arrowrock 0.11 1947 Arrowrock 0.15 1997 Black Canyon 0.17 1936 Black Canyon 0.15 1971 Bully Creek 0.15 NEED DATA Cascade 0.52 1995 SNAKE RIVER Mann Creek 0.13 unpublished Mann Creek 0.39 1992 Unity 0.13 1991
AMERICAN FALLS RESERVOIR
Measured sediment yield values shown in acre-feet/mi2/year Estimated sediment yield value of 0.15 acre-feet/mi2/year Technical Report E.1-2 Figure 4.1 HELLS CANYON HYDROELECTRIC COMPLEX
Basinwide Sediment Yield Computation Schematic An IDACORP Company P:\155638\Graphics\Geomorphologyfigs.fh10 17-Dec-2001 P:\155638\Graphics\Geomorphologyfigs.fh10 15-Dec-2001 (Source: P:\155638\Basin Report\Mainstem_WY2000_Revised.xls 11/12/2001 11:44 AM)
1,000,000
100,000
Anatone, WA Hells Canyon Weiser, ID Dam
King Hill, ID Murphy, ID Heise, ID 10,000
Milner Dam, ID
Discharge (cfs) 1,000
100
10 900 800 700 600 500 400 300 200 100
River Mile
Mean Max Discharge (cfs) NOTE: The period of record used for this figure is Technical Report E.1-2 Figure 4.2 Mean Annual Discharge (cfs) between water year 1926 and 2000 (Oct 1925 HELLS CANYON HYDROELECTRIC COMPLEX to Sept 2000) to represent post-regulation Mean Min Dsicharge (cfs) conditions following the completion of American Falls Reservoir in 1926. Comparison of Discharges Throughout Study Area An IDACORP Company WATERSHED PRODUCTION SEDIMENT ZONE 1 SOURCE AREA
UPSTREAM CONTROLS (Climate, diastrophism, land use)
TRANSFER ZONE 2
DOWNSTREAM CONTROLS (base level, diastrophism) DEPOSITION ZONE 3
SEDIMENT SINK DEPOSITIONAL AREA
From Schumm 1977.
Technical Report E.1-2 Figure 4.3 HELLS CANYON HYDROELECTRIC COMPLEX
Key Fluvial Geomorphology Zones
An IDACORP Company P:\155638\Graphics\Geomorphologyfigs.fh10 15-Dec-2001 This page left blank intentionally. Technical Report E.1-2 Figure 4.4 Study Area Vicinity Features Legend r MN GN HELLS CANYON HYDROELECTRIC COMPLEX Washington Idaho Montana Slope Classification 17 30' 0 08' 311 MILS Slope Classes less than 10 degrees 2 MILS Oregon 10 to 30 degrees Wyoming 30 to 40 degrees 30 0 30 60 Miles greater than 40 degrees UTM GRID AND 1987 Nevada Utah MAGNETIC NORTH DECLINATION AT CENTER OF OXBOW QUADRANGLE An IDACORP Company This page left blank intentionally. P:\155638\Graphics\Geomorphologyfigs.fh10 15-Dec-2001 (Source: P:\155638\Basin Report\Snake_profile.xls 08/24/2001 11:54 AM)
8000
7000 Jackson
6000 Heise 5000 Blackfoot Minidoka Milner 4000 Buhl 3000 King Hill Channel Elevation (ft) CJ Strike Murphy Nyssa Weiser
2000 Brownlee Dam Hells Canyon Dam
Note: Elevations within the HCC are approximate. Salmon River 1000 Anatone
Sources: USGS (1997a,b), IPC (2001b) 0 100 200 300 400 500 600 700 800 900 1000
River Mile above Mouth
Technical Report E.1-2 Figure 4.5 HELLS CANYON HYDROELECTRIC COMPLEX
Snake River Channel Profile
An IDACORP Company P:\155638\Graphics\Geomorphologyfigs.fh10 17-Dec-2001 LEGEND: 52 mmh Reservoir bottom sediments Current bed subsurface g 27 mm c Current bed surface (armor) g 0.062-0.20 mm 54 mm c 20-250 mm Bonneville Flood boulders 1420 mma a O’Connor 1993 b Osterkamp 1997 c IPC 2001b Grande Ronde d USBR 1984 River e IPC 2000b f Emmett 1975
Hells Canyon g Jones and Seitz 1980 Salmon River h Asotin 2001 Burnt & HCC i USBR 2001 Powder Rivers <0.062 mmc Weiser River Payette 22 mmf River <0.062 mmd 23-26 mmb >40 mmb 22 mmb Malheur River 0.062 mmi Upper Snake River Boise River 17-25 mmb <100 mmb <16 mme 55 mme American 2160 mma Falls 340 mma CJ Strike Lake Walcott Owyhee River
Technical Report E.1-2 Figure 4.6 HELLS CANYON HYDROELECTRIC COMPLEX
SummarySummary of of Relative Relative Sediment Sediment Size Size DataData (d (d5050) )in in the the Study Study Area Area An IDACORP Company P:\155638\Graphics\Geomorphologyfigs.fh10 15-Dec-2001 (Source: P:\155638\Basin Report\Mainstem_WY2000_Revised.xls 11/12/2001 11:44 AM)
100,000
10,000
Payette River Boise River 1,000 Weiser River
Owyhee River Malheur River
100 Discharge (cfs)
10
1 405 395 385 375 365 355 345
River Mile
NOTE: Mean Max Discharge (cfs) Available data from the period following the Technical Report E.1-2 Figure 4.7 Mean Annual Discharge (cfs) last major storage facility (see Table 2.2) are HELLS CANYON HYDROELECTRIC COMPLEX used as the period of record for each major Mean Min Dsicharge (cfs) tributary upstream from HCC. Comparison of Discharges from Major Tributaries Upstream from the HCC An IDACORP Company 10000 Owyhee River 8000 Middle Fork Owyhee River North Fork Owyhee River 6000 West Little Owyhee River 4000
2000 Elevation (ft) 0 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 0
River Mile (From Snake River, miles)
10000 Boise River Middle Fork Boise River 8000 North Fork Boise River 6000 South Fork Boise River 4000
2000 Elevation (ft) 0 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 0
River Mile (From Snake River, miles)
10000 Payette River 8000 Middle Fork Payette River North Fork Payette River 6000 South Fork Payette River 4000 2000 Elevation (ft) 0 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 0
River Mile (From Snake River, miles)
10000 Malheur River 8000 Little Malheur River North Fork Malheur River 6000 South Fork Malheur River 4000 2000 Elevation (ft) 0 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 0
River Mile (From Snake River, miles)
10000 Weiser River West Branch Weiser River 8000 East Fork Weiser River West Fork Weiser River 6000 Middle Fork Weiser River Little Weiser River 4000
Elevation (ft) 2000
0 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 0
River Mile (From Snake River, miles)
Technical Report E.1-2 Figure 4.8 HELLS CANYON HYDROELECTRIC COMPLEX
Stream Profiles for Each of the Major Tributaries Upstream An IDACORP Company from the HCC 08/23/2001 10:45 AM ) P:\155638\Graphics\Geomorphologyfigs.fh10 15-Dec-2001 (Source: P:\155638\Basin Report\anthropogenic\Milner_Boise.xls 08/23/2001 10:45 Hypsometric Curve for Mainstem Snake River Basin 12000 Snake River Study Area 10000
8000
6000
Elevation (ft) 4000
2000
0 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Percent of Area Above Various Elevations
Comparison of Hypsometric Curves for the Major Tributaries 12000 Owyhee River Basin Boise River Basin Malheur River Basin 10000 Payette River Basin Weiser River Basin
8000
6000
Elevation (ft) 4000
2000
0 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Percent of Area Above Various Elevations
Comparison of Hypsometric Curves for Local Tributaries Within and Downstream from HCC 12000 Burnt River Basin Powder River Basin Imnaha River Basin 10000 Salmon River Basin Grande Ronde River Basin
8000
6000
4000 Elevation (ft) 2000
0 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Percent of Area Above Various Elevations
Technical Report E.1-2 Figure 4.9 HELLS CANYON HYDROELECTRIC COMPLEX
HypsometricSediment YieldCurves Computaion Schematic An IDACORP Company P:\155638\Graphics\Geomorphologyfigs.fh10 04-Jan-2002 \GIS\Hysometric curves.xls 8-21-2001 P:\155638\Graphics\Geomorphologyfigs.fh10 15-Dec-2001 (Source: P:\155638\Basin Report\Brownlee_inflow2.xls 11/15/2001)
40,000,000
35,000,000
30,000,000
25,000,000
20,000,000
15,000,000 Snake River Volume (acre feet) Snake River Volume
10,000,000
5,000,000
0 1993 1994 1995 1996 1997 1998 1999 2000
Water Year
Estimated Unregulated Flow Technical Report E.1-2 Figure 4.10 Observed Regulated Flow HELLS CANYON HYDROELECTRIC COMPLEX
Annual Unregulated versus Observed Inflow to Brownlee Reservoir: 1993-2000 An IDACORP Company P:\155638\Graphics\Geomorphologyfigs.fh10 15-Dec-2001 (Source: P:\155638\Basin Report\Brownlee_inflow2.xls 11/15/2001)
60,000 160,000
140,000 50,000
120,000
40,000
100,000
30,000 Flow Rate (cfs)
20,000
10,000
0 01-Oct-93 30-Nov-93 29-Jan-94 30-Mar-94 29-May-94 28-Jul-94 26-Sep-94
Technical Report E.1-2 Figure 4.11 HELLS CANYON HYDROELECTRIC COMPLEX Estimated Unregulated Flow Observed Regulated Flow Unregulated versus Observed Inflow to Brownlee Reservoir: Water Year 1994 An IDACORP Company P:\155638\Graphics\Geomorphologyfigs.fh10 15-Dec-2001 (Source: P:\155638\Basin Report\Brownlee_inflow2.xls 11/15/2001)
160,000
140,000
120,000
100,000
80,000
Flow Rate (cfs) 60,000
40,000
20,000
26-Sep-94 0 01-Oct-96 30-Nov-96 29-Jan-97 30-Mar-97 29-May-97 28-Jul-97 26-Sep-97
Technical Report E.1-2 Figure 4.12 HELLS CANYON HYDROELECTRIC COMPLEX Estimated Unregulated Flow Observed Regulated Flow Unregulated versus Observed Inflow to Brownlee Reservoir: Water Year 1997 An IDACORP Company P:\155638\Graphics\Geomorphologyfigs.fh10 15-Dec-2001 (Source: P:\155638\Basin Report\Mainstem_WY2000_Revised.xls 11/12/2001 11:44 AM)
100,00 0
10,000 Salmon River Grande Ronde River
1,000 Imnaha River Pine Creek Powder River
Burnt River Wildhorse River 100 Discharge (cfs)
10
1 350 330 310 290 270 250 230 210 190 170 150 River Mile
26-Sep-97
Mean Max Discharge (cfs) Technical Report E.1-2 Figure 4.13 Mean Annual Discharge (cfs) HELLS CANYON HYDROELECTRIC COMPLEX Mean Min Dsicharge (cfs) Comparison of Discharges From Local Tributaries Within and An IDACORP Company Downstream from HCC This page left blank intentionally.
This page left blank intentionally. Technical Report E.1-2 Figure 5.2 HELLS CANYON HYDROELECTRIC COMPLEX
After Frissell et al. (1986) and Nested Hierarchy of Spatial Scales for Montgomery and Buffington (1998). Examining Channel Morphology An IDACORP Company P:\155638\Graphics\Chap5figs.fh10 27-May-2002 Technical Report E.1-2 Figure 5.3 HELLS CANYON HYDROELECTRIC COMPLEX
Longitudinal Profile and Valley Segments between Hells Canyon Dam and Asotin An IDACORP Company P:\155638\Graphics\Chap5figs.fh10 27-May-2002 NOTE: Ratio of the flow width for the 1.5- year discharge to that of the 100-year discharge (W1.5/W100) as a function of distance downstream from Hells Canyon Dam (RM 247). W1.5/W100 provides a hydraulic definition of channel confinement. The black line indicates the average downstream change in channel confinement.
Technical Report E.1-2 Figure 5.4 HELLS CANYON HYDROELECTRIC COMPLEX
Channel Confinement Ratio of the
Flow Widths Using W1.5/W100 An IDACORP Company P:\155638\Graphics\Chap5figs.fh10 27-May-2002 This page left blank intentionally. 14L0 ewiston
Asotin 145 15 150
155
14
160
165 13
170 . Rv G de rande Ron 12
I 1d 75 Washington a h Oregon o 11
n R o i 180 v
m e l r
a S Grangeville 10 185
190 9 195 8
7 200 6 205
210 5 er iv R
215
r 22e0 iv Imnaha R 4
225
3 230
2 Enterprise 235 Riggins
a
h e
a k a Joseph n n m 24S0 I 1
245 Hells Canyon Dam
250
W A S H I N G T O N
e R Sna k iv e r um er C ol bia Riv S lmon ive a R r Hells Canyon Oxbow Brownlee O R E G O N I D A H O
Snake R iver
Vicinity Map This page left blank intentionally. Technical Report E.1-2 Figure 5.6 HELLS CANYON HYDROELECTRIC COMPLEX
Thalweg Profile Showing Pool-riffle Sequences Typical of Study Area
An IDACORP Company P:\155638\Graphics\Chap5figs.fh10 27-May-2002 NOTE: Inset box plot shows the total distribution of pool spacings (channel widths per pool). Line within the box is the median value, box ends are the inner and outer quartiles, and whiskers are the inner and outer tenths. n is the number of observations. Channel width is based on the MIKE 11 predictions of Q1.5.
Technical Report E.1-2 Figure 5.7 HELLS CANYON HYDROELECTRIC COMPLEX
Pool Spacing as a Function of River Mile An IDACORP Company P:\155638\Graphics\Chap5figs.fh10 27-May-2002 1 tributary fan 2. morphologic rapids 3 forced pool 4 eddy zone and bar 5 riffle
See text for further discussion of these channel units and associated processes. Technical Report E.1-2 Figure 5.8 HELLS CANYON HYDROELECTRIC COMPLEX
Typical Channel Units and Process Domains Created by Debris Fans in An IDACORP Company Confined Channels P:\155638\Graphics\Chap5figs.fh10 27-May-2002 Technical Report E.1-2 Figure 5.9 HELLS CANYON HYDROELECTRIC COMPLEX
Distribution of Pool Types between Hells Canyon Dam and Asotin An IDACORP Company P:\155638\Graphics\Chap5figs.fh10 27-May-2002 NOTE: Residual pool depth is difference between pool bottom and downsream riffle crest (Bathurst 1981; Lisle 1987). Box plots for different pool types show the total distribution of pool depths. Line within the box is the median value, box ends are the inner and outer quartiles, and whiskers are the inner and outer tenths. n is the number of observations.
Technical Report E.1-2 Figure 5.10 HELLS CANYON HYDROELECTRIC COMPLEX
Distributions of Residual Pool Depth
An IDACORP Company P:\155638\Graphics\Chap5figs.fh10 27-May-2002 Technical Report E.1-2 Figure 5.11 HELLS CANYON HYDROELECTRIC COMPLEX
Residual Pool Depth as a Function of Pool Type and Distance Downstream An IDACORP Company from Hells Canyon Dam P:\155638\Graphics\Chap5figs.fh10 27-May-2002 NOTE: Technical Report E.1-2 Figure 5.12 Relationships for reach-average values HELLS CANYON HYDROELECTRIC COMPLEX predicted using the 1-D hydrodynamic model MIKE 11 (DHI 2000). Downstream Hydraulic Geometry
Relationships for Q1.5 An IDACORP Company P:\155638\Graphics\Chap5figs.fh10 27-May-2002 P:\155638\Graphics\Chap5figs.fh10 27-May-2002 (Source: P:\155638\Basin Report\Mainstem_WY2000_Revised.xls 11/12/2001 11:44 AM)
NOTE: Variations predicted using the 1-D Technical Report E.1-2 Figure 5.13 hydrodynamic model MIKE 11 (DHI HELLS CANYON HYDROELECTRIC COMPLEX 2000). This dataset includes individual predicted channel characteristics rather than the reach-average values shown Downstream Variation of Channel in Figure 5.12. Characteristics for Q1.5 An IDACORP Company As modified from Buffington et al. (in press b). PR = pool-riffle fPR= forced pool-riffle HC = Hells Canyon PB = plane-bed SP = step-pool CA = cascade
Morphologic definitions of Montgomery and Buffington (1997). Additional pool-riffle data are used here from Kellerhals et al. (1972), Charlton et al. (1978), and Hey and Thorne (1986). Technical Report E.1-2 Figure 5.14 HELLS CANYON HYDROELECTRIC COMPLEX
Parker-type Regime Diagram Comparing Data for Hells Canyon Pool-riffle An IDACORP Company Channels to Other Channel Types P:\155638\Graphics\Chap5figs.fh10 27-May-2002 This page left blank intentionally.
This page left blank intentionally. ) S 50 * t ( SHIELDS STRESS
SKIN FRICTION STRESS (tsf, Pa)
NOTE: The shaded horizontal band indicates typical values of the dimensionless critical shear stress
for incipient motion of d50 (t*c50 = 0.03-0.09, Buffington and Montgomery 1997). Here 107 surface samples are available, while Figure 5.20 is limited to the 21 bar sites where both surface and subsurface sediments were sampled.
Technical Report E.1-2 Figure 5.16 HELLS CANYON HYDROELECTRIC COMPLEX
Shields Stress of the Median Surface Grain Size as a Function of Skin An IDACORP Company Friction Shear Stress for the Q1.5 Flow P:\155638\Graphics\Chap5figs.fh10 27-May-2002 Data from Parkinson et al. (2002).
Technical Report E.1-2 Figure 5.17 HELLS CANYON HYDROELECTRIC COMPLEX
Grain-size Distributions of Surface Material Sampled on Bars in the Upper and Middle An IDACORP Company Valley Segments (RM 247-188) P:\155638\Graphics\Chap5figs.fh10 27-May-2002 NOTE:
d16, d50, and d84 are the 16th, 50th, and 84th percentiles of the cumulative grain size distribution expressed as the percentage finer than a given size. Data from Parkinson et al. (2002).
Technical Report E.1-2 Figure 5.18 HELLS CANYON HYDROELECTRIC COMPLEX
Grain-size Percentiles as a Function of River Mile An IDACORP Company P:\155638\Graphics\Chap5figs.fh10 27-May-2002
P:\155638\Graphics\Chap5figs.fh10 07-May-2003 LEGEND: 100% 10% Hells CanyonFlood Terrace Hells CanyonSandBars Hells CanyonMainstemSediment BelowSalmonRiver Salmon RiverSandBar Hells CanyonLocal Tributaries Hells CanyonMainstemSediment Brownlee ReservoirSediments Major Tributaries Above HCC Mainstem Sediment Above HCC Upper MainstemSediment An IDACORP Company 20% 35% Quartz
30% 90% Quartz
40% 80% 50%
60% 70% 70%
80% 60% 90%
Plagioclase
100%
52% Plagioclase 52% 50%
10%
13% Kspar 40% 20%
30% Ternary Diagram ofIndicatorParameters 30% HELLS CANYONHYDROELECTRIC COMPLEX 40% Technical Report E.1-2Figure5-19
50% (Quartz, Plagioclase, Kspar)
20% 60% Kspar
70% 10% 80%
90%
100% NOTE:
Armoring is the ratio of surface median grain size d50s) to subsurface median grain size d50ss). Data from Parkinson et al. (2002). Note that subsurface samples were obtained only for 21 of the 107 bar sites shown in Figure 5.17.
Technical Report E.1-2 Figure 5.20 HELLS CANYON HYDROELECTRIC COMPLEX
Armoring as a Function of River Mile An IDACORP Company P:\155638\Graphics\Chap5figs.fh10 27-May-2002 NOTE: Based on Dietrich et al. (1989). Lowest value on the x-axis represents q values <0, with 17 of the sample b*D sites having immobile surfaces and q values <0. b*D
Technical Report E.1-2 Figure 5.21 HELLS CANYON HYDROELECTRIC COMPLEX
Dimensionless Transport Rate as a Function of River Mile An IDACORP Company P:\155638\Graphics\Chap5figs.fh10 27-May-2002 PROCESS Geology Climate Fire Land Use DRIVERS
Watershed Watershed Watershed Watershed Conditions Conditions Conditions Conditions 1 2 3 4 2 3 4 3 4 2 3 4 1 2 3 4 WATERSHED Hydraulic Sediment CONDITIONS Topography Discharge Supply Vegetation valley slope magnitude volume riparian channel confinement frequency frequency wood debris dudration size
Channel Characteristics grain size width depth bed slope bed forms channel pattern
Reach Morphology dune-ripple pool-riffle braided plane-bed step-pool cascade colluvial bedrock After Buffington et al. (in press b).
Technical Report E.1-2 Figure 6.1 HELLS CANYON HYDROELECTRIC COMPLEX
Controls on Watershed Characteristics and Channel Morphology An IDACORP Company NOTE: Baseflow of 10,000 cfs ramped to a peak discharge of 20,000 cfs. See text for further discussion. Immobile sites at discharges of -4 10,000 cfs are plotted as qb*<10 .
Technical Report E.1-2 Figure 6.2 HELLS CANYON HYDROELECTRIC COMPLEX
Potential Channel Response to Hydropower Operations An IDACORP Company