GMSWORKS-3 Peace River Side Channel Restoration - BC Hydro

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Figure 3: Maximum Discharges on the Peace River Table 1. Maximum Daily Discharges on the Peace River. Pre‐Regulation Post‐Regulation WSC Station (m³/s) (m³/s) Average Low Average High Peace Canyon Dam ‐ 1,683 1,926 3,293 Peace River at Hudson Hope 6,165 1,640 1,940 3,170 Peace River above Pine River 7,525 1,590 2,225 4,040 Peace River near Taylor 1,820 2,788 4,470 The average post‐regulation annual maximum daily flow (under the ‘normal’ operating regime) is 31% of the pre‐regulation value at Hudson Hope and 37% near Taylor. Interested readers are referred to the more comprehensive discussion of pre‐ and post‐regulation changes in hydrology and sediment transport presented in Church (in press). Additional hydrometric data is currently being collected at 5 stations along the reach under GMSWORKS‐5, a program to provide continuous measurements of discharge at key locations from PCN to Fort St John. Data from the remote hydrometric stations is transmitted to BC Peace River Side Channel Restoration 6
Hydro via telemetry, and will be utilized to better understand how flows and water levels in the reach may influence side channel hydrology and function. The locations of hydrometric stations operated under GMSWORKS‐6 are included in the overview and on site map sheets In addition to the hydrometric work, bathymetric surveys and a hydraulic model of the reach are being prepared under GMSWORKS‐6. This modelling is being coordinated with the overall hydraulic modelling of the Peace River from PCN to the BC‐Alberta border. The model will help to better understand flow magnitude and the effects of ramping within the reach, and provide estimates of water elevations between existing hydrometric stations. 3.3 Geomorphology The geomorphology of Peace River has been the subject of on‐going investigations by BC Hydro and others. Relevant reports include river regime and morphology studies undertaken for the initial investigation of dam sites at Sites C and E (BC Hydro and Power Authority, 1975). Earlier studies by Kellerhals and Gill (1973) and Kellerhals (1982) assessed the affect of river regulation on channel processes, which included side channels. Professor Michael Church at the UBC Department of Geography, along with his colleagues and students, has been systematically investigating regulation related changes in channel morphology, ice processes and riparian vegetation. Relevant reports include: Church and Rood, 1982; Church, 1995; Church and North, 1996; Church et al., 1997; Ayles, 2001; Ayles and Church, (in press), and Zu and Church, (in press). 3.4 Fish Habitat and Fish Community The success (i.e., abundance and distribution) of existing fish populations in the Peace River are a result of the interaction between species‐specific habitat requirements and the influence of the regulated flow regime. The fish community that presently resides in the study area is composed of fish populations that have adjusted to the regulated flow regime that has been in place since 1969 or that have utilized life history strategies that circumvent or exploit the effects of the regulated flow regime. RL&L (2001) described Peace River fish habitats in British Columbia with particular reference to the influence of flow regulation on habitat utilization by small fish. P&E (2002) characterized near‐shore fish habitats in the Peace River with particular reference to large fish. RL&L (1992) assessed the implications of flow regulation on the Peace River to fish habitat and the fish community. The quantity and suitability of side channel habitats are currently being quantified under GMSWORKS‐4 for flows between 300‐1800 m 3 /s, to better understand the availability and flow characteristics of side channel habitats within the study reach. Fish studies within the study area consistently show that the fish community is numerically dominated by adults and older juveniles of large‐fish species, with a paucity of younger fish in the large‐fish species and most small‐fish species. The mechanism driving this outcome is the absence of suitable habitats needed by small‐sized fish in the Peace River, which is caused by Peace River Side Channel Restoration 7
Page 1 and 2: Peace River Project Water Use Plan
Page 3 and 4: Executive Summary This study was in
Page 5 and 6: Acknowledgements The authors would
Page 7 and 8: Table of Contents Executive Summary
Page 9 and 10: 1 Scope of Work The Peace River’s
Page 11 and 12: assessment purposes. Data, analyses
Page 13: Figure 1: Pre‐Regulation Peace Ri
Page 17 and 18: channel must be sheltered from high
Page 19 and 20: These impacts have been recognized
Page 21 and 22: while the mainstem river area was e
Page 23 and 24: Physical criteria developed in this
Page 25 and 26: a) Inlet improvements for additiona
Page 27 and 28: Studies on the Nechako River indica
Page 29 and 30: Site isolation costs and contingenc
Page 31 and 32: 40.5L 3.0 18.0 Ephemeral Medium 58L
Page 33 and 34: The restoration concept includes: 1
Page 35 and 36: vegetation. The most serious limita
Page 37 and 38: A series of extensively infilled ch
Page 39 and 40: 7.10 River KM 98.2R Site 98.2R cons
Page 41 and 42: compiled at a common scale to docum
Page 43 and 44: Instream Flow Needs Workshop, Walde
Page 45 and 46: Site Summary and Cost Tables Peace

GMSWORKS-3 Peace River Side Channel Restoration - BC Hydro

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