D R A F T. Alaska Department of Fish & Game (ADFG) Northern Ecological Services
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1 D R A F T Cooper Lake Project Relicensing Meeting Summary: Instream Flow Review Team Meeting June 11, :30 to 11:15 A.M. HDR Alaska, Inc., Conference Room Anchorage, AK Meeting Attendance: Name Margaret Beilharz by phone David Blanchet Tom Cappiello Paul DeVries by phone Mike Gagner by phone Jason Kent Greg Koonce Dan Miller John Morsell Sally Morsell Jason Mouw Larry Peltz Gary Prokosch Affiliation U.S. Forest Service (USFS) USFS / Chugach National Forest Alaska Department of Fish & Game (ADFG) R2 Resources R2 Resources HDR Alaska, Inc. (HDR) Inter-Fluve Inter-Fluve Northern Ecological Services HDR ADFG National Marine Fisheries Service (NMFS) Alaska Department of Natural Resources (ADNR) (Note: A copy of the presentation materials shown during the workshop is attached to this meeting summary.) Opening / Overview of Objectives Following introductions around the room, Jason Kent briefly summarized the purpose and agenda for the day s workshop: to update the group on components of the ongoing Cooper Creek instream flow study and to summarize the study site and transect selection meetings. Jason noted that the objectives were to get strong agreement from the group regarding the technical details described during the presentation and to ensure that the components of the study will address resource concerns of the stakeholders. The discussion then moved to the main agenda items Aquatic Habitat Survey Update Jason Kent presented a brief update of the 2003 Aquatic Habitat Survey study efforts. Tier 3 survey was conducted in the Alluvial and Canyon Reaches. Preliminary inspection of the survey data indicates that the locations of surveyed mesohabitat in 2002 have not moved due to the floods and associated landslides in late October In the Canyon Reach, the expected ratio of mesohabitats was surveyed, with the majority of habitat Chugach Electric Association, Inc. Cooper Lake Project (FERC No. 2170) Page 1 Draft 6/11/03 Meeting Summary Instream Flow Review Team Meeting
2 D R A F T being riffle-boulder with smaller percentages of riffle-cobble and cascade-step pool habitats. A large avalanche in the Canyon Reach over the winter likely temporarily dammed up flow to a pool depth of feet, and eventually breached the snow dam and created a sizeable scour hole downstream. The Aquatic Habitat Survey final report will be issued in Winter Study Site and Transect Selection Summary Jason Kent summarized the March 26 meeting and the May 9/12 field trips. The general locations of the study reaches and their dominant mesohabitat types were reviewed. The bases of transect selection presence of islands or side channels, breaks in cover, tangential velocity, and equal intervals were reviewed for each study site. Complete summaries of the March 26 and May 9/12 meetings were separately distributed to the instream flow review team. Study Methods Update Jason Kent summarized the updates to the study plan concerning the study methods. First, Kent affirmed that the IFIM study is, and will be, conducted consistent with the recommendations and procedures given in Bovee (1998). This document references several documents providing detail that will also be utilized throughout the study. Level survey will be used instead of an Acoustic Doppler Current Profiler (ADCP) and total station to measure transect geometry and water surface elevations. A Marsh- McBirney 201 Velocity Meter will be used to measure velocities. If necessary, a Wolman Pebble Meter (a.k.a. gravelometer ) will be used to measure substrate size. Global Positioning Systems were used in transect selection to record the location of the downstream transect for each study site, however GPS data may be unreliable in this area of the country, especially in the Canyon Reach, due to reduced satellite coverage. It is recommended that GPS data be carefully reviewed and used for display purposes only. Mike DeVries asked about calibration procedures; Kent responded that the calibration procedures of all instruments were being followed and these procedures will be described in upcoming reports. A complete velocity data set was collected at each transect in May The flows at the Cooper Creek USGS gage during the data collection period ranged from 30 to 60 cfs. Because it is desirable that velocity data be collected near the high range of flows for calibration, this velocity set will likely be used as a verification set, and a calibration velocity set will be collected at higher flows. As an ADCP was not used to collect stream data, velocity data were and will be collected at the same verticals used for geometry to simplify PHABSIM data entry. Mike DeVries raised the question of positioning of the verticals taking into consideration the selected habitat model. Kent responded that the habitat models have not been selected yet, and more than one model may be used; those models may define the edges of the vertical cells differently. In any case, the verticals were positioned to adequately define shear velocity components usually caused by rocks directly upstream of the transect. Distances Chugach Electric Association, Inc. Cooper Lake Project (FERC No. 2170) Page 2 Draft 6/11/03 Meeting Summary Instream Flow Review Team Meeting
3 D R A F T between verticals generally do not exceed 2 feet in the main channel. In addition, DeVries asked about the positioning of transects in plunge pools. Kent responded that transects were positioned in areas of the pools that seemed to exhibit orthogonal, or horizontal, velocity vectors. Areas with substantial visible vertical velocity components were avoided as transect locations. Sediment Transport Study Jason Kent introduced Greg Koonce and Dan Miller of Inter-Fluve, the subconsultants for the sediment transport component of the instream flow study. Koonce began by asking the group what questions it wants the sediment study to answer. Dave Blanchet replied that from the USFS perspective, the question is whether sediment is a contributor to the disappearance of chinook salmon and coho salmon from Cooper Creek. Of primary importance to the USFS is the possible settlement of fine sediment, potentially contributing to increased embeddedness, as a result of lower flows in the creek due to Cooper Lake Dam. Greg Koonce and Dan Miller walked the creek the day before, and shared some of their observations. They identified morphological features of the stream that were results of glaciation, large and presumably pre-dam floods, and the more recent reduced flow in the channel, as well as recent flood and avalanche events. The group discussed the differences between the reach of Cooper Creek upstream of Stetson Creek and the reach downstream of Stetson Creek; the upstream reach is more heavily impacted by the presence of the Cooper Lake Dam. The October 2002 flood was discussed at length. The flood reached flows of over 700 cfs with an average flow of 429 cfs on October 23, 2002, according to provisional USGS gage data. Koonce and Miller agreed that the large flood event might have scoured some previously settled fine material, and that could affect the study in general, especially the embeddedness calculations in the reaches downstream of Stetson Creek. Koonce noted that the presence of the Cooper Lake Dam does not affect the historical supply of sediment to Cooper Creek; rather it reduces the supply of clear water to the creek. The group discussed this concept and the possibility of defining a sediment budget for Cooper Creek. In the end, the group agreed that the sediment transport study will be followed as it is written in the final study plan, with the exception that phase two of the plan, sediment transport data collection and modeling, will be undertaken regardless of the results of the embeddedness study. The embeddedness study will be undertaken using a rapid assessment methodology at several transects, and the results of the rapid assessment will be used to select sediment sampling study sites. Habitat Suitability Criteria Jason Kent turned the discussion on Habitat Suitability Criteria (HSC) over to John Morsell of Northern Ecological Services. Morsell summarized the methods for developing HSC specific to Cooper Creek from the study plan. Morsell said site-specific data for spawning and juvenile Dolly Varden will be collected this fall. He noted that site-specific data collected in Cooper Creek for resident Dolly Varden will reflect the current flow conditions in the creek and may not be suitable for predictions at higher Chugach Electric Association, Inc. Cooper Lake Project (FERC No. 2170) Page 3 Draft 6/11/03 Meeting Summary Instream Flow Review Team Meeting
4 D R A F T flows. In addition, presence and use of the creek by coho salmon will be the focus of two surveys this fall. For the target species that are not present (rainbow trout, chinook salmon, and possibly coho salmon), HSC will be developed using one or a combination of the following sources: peer-reviewed literature, existing data from similar streams within or outside of Alaska, and professional judgment. Study Schedule Update Jason Kent discussed the upcoming study schedule. Three more data collection trips were planned. Dates were not set for the trips; rather the schedule will be set by the flow in the creek. Ideally, data would be collected at a low flow (20-25 cfs), a mid-range flow ( cfs) and a high flow ( cfs). Considering this year will potentially be a low flow year due to the below average snowpack, high flow data may have to be collected in Data reduction and model calibration will commence in winter The next Instream Flow Review Team meeting will be scheduled for this winter. Closing The meeting adjourned at approximately 11:15 A.M. Chugach Electric Association, Inc. Cooper Lake Project (FERC No. 2170) Page 4 Draft 6/11/03 Meeting Summary Instream Flow Review Team Meeting
5 Instream Flow Study Update June 2003 Chugach Electric Assoc. HDR Alaska, Inc. June 11, 2003
6 Outline 2003 Aquatic Habitat Survey Results Results of Study Site/Transect Selection Update of Study Methods Update of Study Schedule
7 2003 Aquatic Habitat Survey Canyon Reach No major change from 2002 Tier II survey Primarily Rf-bd habitat Some Rf-cb and Pl-mcs Final Aquatic Habitat Inventory report scheduled to be released winter
8 Summary of Study Site/Transect Selection Meetings and Field Work Study area Segment Mesohabitat Type Study Site Transect An example of this hierarchy for Cooper Creek is given below: Cooper Cr. Alluvial Reach Rf-cb Study site C Transect 3
9 Summary of Study Site/Transect Selection Meetings and Field Work Data collection methods and equipment: Data collection methods are consistent with recommended procedures given in Bovee (1998) Level survey for geometry and WSE Marsh-McBirney model 201 velocity meter Wolman Pebble Meter for substrate
10 Summary of Study Site/Transect Selection Meetings and Field Work Study Area Segment Mesohabitat # of Study Sites # of Transects Type Cooper Creek Alluvial Reach Rf-cb 3 a b Pl-mcs 1 b Canyon Reach Cs-sp 1 Pl-mcs 1 Rf-bd 1 Rf-cb c Stetson Reach Pl-dm + Pl-pp 1 Gl-gl 1 Rf-bd 1 Rf-cb 1 a 2 of the 3 study sites describe side channels b b b c b b b b b Approximately 3-5 per study site. c If necessary
11 Summary of Study Site/Transect Selection Meetings and Field Work Study Site Reach Mesohabitat # X- Transect Selection Notes Desig. Type Secs Basis A Stetson Rf-cb 5 Presence of island B Stetson Pl-dm + Pl-pp 4 Equal intervals C Stetson Rf-bd 4 Breaks in cover D Stetson Gl-gl 3 Breaks in cover Selected May 11 E Canyon Rf-bd 4 Breaks in cover Bedrock & boulder cover F Canyon Cs-sp 3 Equal intervals and tangential velocity
12 Summary of Study Site/Transect Selection Meetings and Field Work Study Site Desig. Reach Mesohabitat # X- Transect Selection Notes Type Secs Basis G Canyon Rf-cb 4 Breaks in cover Undercut banks as cover. If necessary H Canyon Pl-mcs 4 Equal intervals and tangential velocity I Alluvial Pl-mcs 4 Equal intervals and tangential velocity J Alluvial Rf-cb 3 Equal intervals K Alluvial Rf-cb 4 Presence of side channel and breaks in cover L Alluvial Rf-cb 5 Presence of side channel and breaks in cover WITH SIDE CHANNEL WITH SIDE CHANNEL
13 DATA COLLECTION METHODS: Horizontal and Vertical Control The only horizontal data required for habitat modeling are distance between transects and relative lengths of cells associated with each transect. Survey level will be used. GPS will be marginally useful due to terrain, and probably not reliable. GPS waypoint will be recorded at one station per study site.
14 DATA COLLECTION METHODS: Transect Measurements Velocity, depth, cover and substrate are collected at each transect. Verification velocity set is considered a luxury, is outside the standard IFIM data set Verification velocity set was collected in May Transect data will be collected in HABTAE convention cell boundaries coincide with the vertical measurements.
15 DATA COLLECTION METHODS: Transect Measurements ADCP not used. For wading rods, mean column velocity will be measured at 60% of distance down from the surface. Verticals will be collected at breaks in slope and, in main channel, intervals will not exceed 2 feet. Electromagnetic meters will be used - Marsh McBirney Model 201.
16 DATA COLLECTION METHODS: Transect Measurements Three trips will be devoted to collecting water surface elevations at the transects. One of the trips will be combined with collecting verification velocities (if budget allows). Survey level will be used to collect water surface elevations.
17 Updated Field Schedule, cont d. Low flow to be collected when Q ~ cfs, probably between July and September Higher flows to be collected when they occur (Q ~ 70, 100) Data collection in 2004, if necessary
18 Updated Field Schedule 500 Cooper Creek Daily Average Flow Flow (cfs) Julian day
19 Updated Field Schedule
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