Abbe, Tim - Washington Forest Law Center

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To:
From:
Date:
Re:
U.S. Fish & Wildlife Service and NOAA Fisheries
Tim Abbe, Ph.D. Herrera Environmental Consultants
May 11, 2005
FFR is fundamentally flawed with respect to ensuring an adequate supply of functional
wood debris.
FFR is fundamentally flawed with respect to ensuring an adequate supply of functional
wood debris.
The FFR1 fails to consider the current low-level of LWD in most channels
The DEIS for the FFR clearly points out that “LWD is a key component of fish habitat providing
cover and pools, and influencing sediment distribution and storage, forming floodplain and offchannel habitats, and serving as food and habitat for aquatic organisms” (DEIS, p.4-176).
“Instream LWD is considered to be one of the most important habitat components lacking in
most streams categorized as “not properly functioning” (DEIS, p.4-177). The DEIS goes on to
state that “the recovery of instream LWD loads will take decades to centuries” (DEIS, p.4-183).
The DEIS goes on to acknowledge that “LWD in streams has been greatly reduced in nearly all
streams within the State due to historical logging practices” (DEIS, p.4-176), explaining why
“most of the riparian landscape occurring in forested areas appears to not be currently fully
functioning” (DEIS, p.4-104).
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64% of streams on private forest land identified as “poor” in regards to in-stream large
woody debris (WFPA 1999).
78% of all streams on State and private lands in Western Washington are in early seral
stage with stem diameters less than 12 inches (WFPB 2000), streams that will take more
than 100 years to recover functional LWD recruitment (DEIS, Table 4.7-2., p.4-104).
61% of similar lands in Eastern Washington are in early seral stage will take more than
100 years to recover functional LWD recruitment (DEIS, Table 4.7-2., p.4-104).
In reviewing the scientific foundations of the FFR it is also acknowledged that “where riparian
stands are dominated by red alder and there is little or no conifer understory, achieving desired
future conditions is likely to be delayed for many years beyond the 140-year mature stand target
age” (CH2M Hill 2000, p.21-16).
The FFR fails to provide assurances that functioning wood levels will be restored in the shortterm through in-stream placement of LWD.
The DEIS acknowledges that “in the near-term LWD in streams would continue to decrease,
especially in larger streams” under all the alternatives (DEIS, p.4-176). “Along non-fishing
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Forests and Fish Report supported forest practices and habitat conservation plan.
FFR is flawed with respect to ensuring an adequate supply of functional wood debris
1
bearing streams the amount of LWD would likely reduce (from natural decay and transport)
under all alternatives in the short-term” (DEIS, p.4-176) since most of these streams will have no
RMZ at all under the proposed rules. The lack of LWD in non-fish bearing channels will reduce
the supply of LWD to fish bearing streams downstream.
Given the small diameters and dominance of deciduous trees in these immature riparian forests,
recruitment would be largely limited to “non functional” wood for most streams and what was
functional would be susceptible to high decay rates and low residence times. Because of these
facts, any plans to protect endangered species must include active placement of functional wood
(FW) into channels deleted in large woody debris to have a reasonable chance of restoring
salmonid habitat.
The DEIS for the FFR clearly states that it will take from 50 to more than 100 years to restore
functional LWD recruitment (“amount of healthy riparian areas”, DEIS, p.4-104) in 99% of State
and private lands in Western Washington, and 95% of those in Eastern Washington (those lands
subject to Washington Forest Practices Rules, DEIS, Table 4.7-2., p.4-104). These projections
are based on optimistic scenarios that ignore flaws in the site potential tree height arguments for
RMZ widths put forth by the FFR.
The DEIS also notes that full functioning LWD recruitment is also dependent on stream size
with regards to recovery time: larger streams require a larger proportion of big trees and more
time to recover (DEIS, Table 4.7-2., p.4-104). This admission that the recruitment of FW varies
with stream size is supported by the best available science but is not addressed in the FFR.
The DEIS notes that active wood placement strategies will be important to meet near-term LWD
needs in many fish-bearing streams, but that such actions are “an option” under the proposed
alternatives (DEIS, p.4-177). Ninety nine percent of Westside forests and ninety-five percent of
Eastside forests (early- to mid-seral riparian stands) “will require active placement to meet
adequate LWD levels over the near term (the next 30 or more years)” (DEIS, p.4-177).
FFR is flawed with respect to ensuring an adequate supply of functional wood debris
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Flawed dependency on site potential tree height (SPTH) of the FFR and unsubstantiated
assertions that proposed RMZ buffers will restore natural wood loading
The FFR does not take into account channel size in consideration of RMZ widths and uses
outdated science with regards to LWD abundance. The FFR cites work by Bilby and Ward
(1991) that reported that LWD abundance decreases substantially in larger unmanaged streams
(CH2M Hill 2000). But Bilby and Ward (1991) failed to weight LWD quantities to channel size
and thus draw inappropriate interpretations since in fact when LWD quantities are measured
relative to channel width they consistently increase with channel size (Fox 2001).
In the “Review of the scientific foundations of the Forests and Fish Plan” (CH2M Hill 2000,
p.2.1-34), it is acknowledged that “the probable amounts of LWD that would be delivered under
the Forests and Fish plan would be less than the amount for maximum pool formation.” Given
that the vast majority of Washington streams are starting with poor wood loading and little or no
potential for recruiting functional wood (due to the early seral stage of riparian forests), even a
plan with the objective of attaining amounts of LWD necessary for maximum pool formation
would be unlikely to achieve these goals in a reasonable timeframe given initial conditions.
Therefore any plan with goals well below the maximum are extremely unlikely to restore and
sustain the habitat necessary (in the future) for the survival of endangered salmonids.
The SPTH model of wood recruitment is based on studies done at a point in time and did not
take into account the relative importance of recruitment processes over decades or centuries. This
basic weakness of the SPTH recruitment model (CH2M Hill 2000, p.2.1-4) is never addressed,
particularly with regards to bank erosion on streams without CMZs, upslope recruitment
(landsliding), and recruitment from upstream source areas (non fish bearing streams) that could
be clear cut under the FFR.
Failure of the FFR to consider hillslope supply of wood debris in RMZ delineations (wood
recruitment from areas not protected as unstable slopes):
Stream erosion at the toe of hillslopes is one of the most common mechanisms initiating
landsliding. This is not surprising considering that fluvial networks are the principal means of
landscape incision and define the lowest topography. Bank erosion can convert a previously
stable slope into an unstable slope. In cases where landslides occurred they would certainly
deliver wood debris from areas more than 50 feet from the channel (e.g., Benda et al. 2002,
2003; May and Gresswell 2003; Reeves et al. 2003). Such situations are not addressed by the
FFR since there is no consideration of the effect of bank erosion on slope stability. Areas that
currently appear to have stable banks and hillslopes can not be assumed to remain that way,
particularly in areas where sedimentation or inputs of FW could initiate bank erosion. All fluvial
networks are subject to fluctuations in sediment supply and/or sediment transport capacity. Large
portions of a channel network, particularly most of the lower gradient fish bearing waters,
experience changes in their morphology when subjected to these fluctuations. Channels can
respond by degradation (incision) or aggradation (sedimentation), both of which typically lead to
bank erosion. For example, when a tree falls into a creek it can impound sediment and water,
FFR is flawed with respect to ensuring an adequate supply of functional wood debris
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forcing flow around the tree and accelerating bank erosion (e.g., Abbe and Montgomery 2003). It
is well established in the literature that fluvial networks are subject to periodic disturbances
which strongly influence wood loading and channel morphology. (e.g., Bragg 2000; Massong
and Montgomery 2000; Lancaster et al. 2001; Benda et al. 2002, 2003; Abbe and Montgomery
2003; May and Gresswell 2003; Montgomery et al. 2003, Reeves et al. 2003). Variations in the
magnitude of wood loading and channel change and where and when these changes occur have a
significant impact on riparian forests and wood recruitment. To restore and sustain fish habitat
any riparian management plan must anticipate the effects of changes in wood loading and
channel morphology, particularly in the case of streams starting with little or no functional wood
and a history of watershed disturbance. Yet the RMZ guidelines proposed by the FFR establish
buffer widths less than the site potential tree height (SPTH) that is widely accepted as the
minimum necessary to attain natural wood loading assuming the channel remains constant
through time, an assumption invalid for much of a channel network.
Once initiated, bank erosion will accelerate FW inputs and trigger even higher bank erosion rates
due to elevated water elevations and flow constriction that result from the FW obstructing the
channel (e.g., Wolff 1916; Abbe and Montgomery 2003; Church 1992; Luzi 2000). This in turn
can over-steepen adjacent hillslopes to trigger landslides which deliver LWD from well outside
the 50 ft core zone of the FFR. But under the FFR the effects of bank erosion in triggering
landsliding is not considered and therefore a significant upslope supply LWD will be eliminated
since “nearly all timber probably would be removed from LWD source areas” (CH2M Hill 2000,
p.21-129).
Through this process more than 70% of the large wood can come from more than 65 feet from
the channel. Under FFR prescriptions most of this source area for FW will be eliminated and
decrease wood loading proportionally. These consequences are supported by several studies
documenting the importance of landsliding in the delivery of FW. Reeves et al. (2003) found that
65.4% of the large wood in 8.7 km of lower Cummins Creek in the central Oregon Coast Range
were from upslope sources, areas above the valley floor, while only 34.6% came from riparian
areas adjacent to the channel. Benda et al. (2003) reports that Landslides were responsible for
delivering more than 80% of the large wood in Redwood and Olympic National Parks (Benda et
al. 2002 and 2003, respectively).
The failure of the FFR to understand, explain and incorporate bank erosion as a wood
recruitment mechanism into considerations of RMZ widths is clearly apparent in the following
statement reported in the “Review of the scientific foundations of the Forest and Fish Plan”
(CH2M Hill 2000, p.21-129):
“Virtually all of the potential LWD supply would be protected from harvest removal
where the combined CMZ and the core-zone widths equal 90 percent or more of the
SPTH.”
This statement explicitly says that a CMZ width less than the SPTH would be sufficient to ensure
all “potential” LWD recruitment occurs. This is a gross mis-understanding of the fact that CMZs
can easily be much larger than any SPTH and that the “potential LWD supply” will be a function
of the total CMZ width and rate channel migration occurs. To imply that “virtually all potential
LWD supply” would be occur with protected buffers of only 90% of the SPTH in the context of
FFR is flawed with respect to ensuring an adequate supply of functional wood debris
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channel migration is completely unfounded. If a buffer starts at 90% the SPTH (much higher
than the actual prescriptions proposed under the FFR), channel migration can reduce LWD
inputs by consuming the forest areas within the CMZ and RMZ. After a channel consumes its
delineated RMZ it will essentially have no new supply of functional wood and be subject to a
severe loss of critical fish habitat. The width of a CMZ is completely independent of the SPTH
and concerns where a channel is prone to move in the near-term (next 140 years).
The failure of FFR to consider the impacts of precluding RMZ protection to non-fishing
bearing streams
Non-fish bearing streams have a significant impact on wood recruitment to fish bearing streams.
1. Increase in debris flow frequency due to lack of riparian protection in non-fish headwater
channels.
2. Decrease in wood debris quantities delivered downstream
Less wood in non-fish bearing headwater channels will decrease the supply to fish
bearing channels downstream.
3. In-stream wood and riparian trees in headwater channels (ephemeral and at least half of
the perennial non-fish bearing streams which will have no riparian buffers under FFR)
tend to slow and diffuse debris flows (e.g., Abbe 2000; Massong and Montgomery 2000;
Lancaster et al. 2001). The lack of riparian trees and in-stream logs will result in longer
debris flow run-out (Massong and Montgomery 2000; Lancaster et al. 2001), impacting
longer distances of fish bearing channels that will be scoured clean of wood by the debris
flow.
The failure of FFR to properly consider recruitment of wood debris from bank erosion in
RMZ delineations.
Benda et al. (2003) and Martin and Benda (2001) defined the recruitment distance of trees
entering a channel through bank erosion as zero. This definition is valid only for the instant that
recruitment occurred and is taken out of context when used to imply that the majority of wood
recruitment through time occurs close to the channel. By definition the tree stood some distance
from the bank prior to erosion occurring and thus could have been quite some distance away
several years earlier. Bank erosion rates are partially dependent on the trees that fall into the
channel. If the trees are large enough to act as functional wood (FW), then they will tend to
obstruct and deflect flow in the channel. In this process, FW tends to accelerate erosion, even
initiating erosion in previously stable banks. Trees that fall into a channel are more likely to
initiate bank erosion that will result in more trees entering the channel and so on (Abbe and
Montgomery 2003), a fact completely ignored by the FFR.
FFR is flawed with respect to ensuring an adequate supply of functional wood debris
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Given the current young seral stage of most riparian forests in the state, bank erosion rates are
likely to be higher than they would be under future desired conditions necessary to sustain
salmonid habitat. Several studies have demonstrated that riparian forests decrease bank erosion
rates (Beeson and Doyle 1995; Micheli et al. 2003; Herrera 2005) and that the larger the riparian
trees, the lower the erosion rate (Herrera 2005). The role of riparian forest trees on bank erosion
and channel changes described earlier have been recognized for sometime (e.g., Wolff 1916;
Davidson and Barnaby 1936), but no consideration of these effects are laid out in the FFR. The
consequences will mean that the narrow 50 ft core zones prescribed by the FFR will be subject to
significant losses in the near term which will in-turn decrease the quantity of functional wood
recruited to channels and increase the time necessary to do so beyond what is predicted by FFR.
In summary, I believe the FFR is fundamentally flawed with respect to ensuring an adequate
supply of functional wood debris to restore and protect the habitat necessary to prevent
endangered salmon from going extinct.
Sincerely,
Tim Abbe, Ph.D.
FFR is flawed with respect to ensuring an adequate supply of functional wood debris
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Citations in Abbe 2001 4(d) Declaration:
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large rivers. Regulated Rivers: Research and Management 12, 201-221.
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channel morphology and lateral migration. EOS, Transactions of the American Geophysical Union 81(19).
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Pollock, M.M. 1999. An assessment of the riparian protection provided in the Forests and Fish Report, and a
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Benda, L., Bigelow, P., and Worsley, T.M. 2002. Recruitment of wood to streams in old-growth and second-growth
redwood forests, Northern California, U.S.A. Canadian Journal of Forest Research 32(8): 1460-1477.
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FFR is flawed with respect to ensuring an adequate supply of functional wood debris
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FFR is flawed with respect to ensuring an adequate supply of functional wood debris
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