HomeMy WebLinkAboutRiver Restoration Phase 1 Project Description - PLN General - 4/27/2010 HAMMA HAMMA RIVER RESTORATION—PHASE 1: PROJECT DESCRIPTION N F1VLD
AND DESIGN MEMO APR 2 7 2010
By: Pat McCullough 4-24-10. 426 W. CEDAR ST.
PROJECT DESCRIPTION NARRATIVE AND DESIGN MEMO FOR
PHASE ONE OF THE HAMMA HAMMA RIVER ESTUARY
RESTORATION PROJECT
The primary objectives of the Hamma Hamma River Estuary Restoration Project are: to
Increase tidal inundation; allow fish access and use; restore floodplain functions, add
protection from predation, and water storage. These objectives will be accomplished over a
multiple year period in several phases in order to accommodate the shellfish production
requirements of the land owner. Phase One of the project will begin the restoration process
by restoring a small 3 acre salt marsh in the southeast corner of the estuary, and installing
two (2) Engineered Log Jams, three (3) habitat structures, and two (2) Y log structures
along south bank of the south fork of the Hamma Hamma River just west of where the river
enters Hood Canal. See FIGURES 1-3 below.
The Proiect Description Narrative
Phase One of the Hamma Hamma River Estuary Restoration Project is a pure habitat
restoration project that does not serve as mitigation for any habitat impacts. The major elements
of this project are twofold: 1) fish habitat restoration and 2) bank protection, and 3) the
restoration of a 3 acres tidal marsh in the southeast corner of the Hamma Hamma estuary.
1. Fish Habitat Restoration.
The lower Hamma Hamma River is presently channelized and tightly confined between
dikes. In the project area the river contains no stable large wood and has minimal
connection to its former floodplain. There is a high rate of preditation by seals on migrating
salmon due to lack of cover for salmon in the lower mile of the river. In order to add cover for
migrating salmon and outgoing salmon fry and to diversify the habitat of the river, it is
proposed to add three to two large, engineered log jams, 3 habitat log jams, and 2 Y-Log
Structures along the south shore of the river. The areas around the engineered log jams,
and habitat jams will be excavated so as to create pools.
In order to complete the construction of the log jams and to prevent degradation of water
quality during construction, the river will be temporarily diverted to the north into a 30 foot
wide gravel channel excavated located in the existing river bed. The diversion channel will
be filled in when the construction of the log jams has been completed. All work on the
project will be completed "in the dry" while the tide is out.
Each of the engineered log jams will consist of approximately 12 to15 — 30" to 42" conifer or
cedar logs plus smaller "filler" pieces. The base of the log jams will be set at around
elevation 0 MLLW and extend to elevation 8 MLLW or above. They will be mostly under
water during the higher tides and river flow. The anchoring systems for the log jams will be a
combination of pin piles driven into the river bed, galvanized chain or cable tie downs with
buried anchor blocks or rocks, and rock rubble or gravel ballast placed on top of the logs
buried in the south bank of the river. The anchoring systems will be able to resist flotation of
the log jams as well as the force of the river during heavy flows.
11 . Ede
HAMMA HAMMA RIVER RESTORATION- PHASE 1: PROJECT DESCRIPTION NARRATIVE
AND DESIGN MEMO
By: Pat McCullough 4-24-10.
2, Bank Protection
In addition to providing much needed salmon habitat the proposed engineered log jams,
habitat structures, habitat structures, and Y log structures will also serve to prevent further
erosion along the river bank. The log jams will be strategically placed along the south bank
of the river to redirect the flow of water.
It will be necessary to construct a small access roadway along the south bank of the river
for construction access. The roadway will be built on geotextile fabric and will be removed
after construction with using methods that minimize the impact on the existing salt marsh.
3. Salt Marsh Restoration
The tidal circulation in a 3 acre salt marsh in the southeast corner of Hamma Hamma
Estuary has been impacted by filling and the construction of an access roadway. The
existing roadway that was constructed over the salt marsh will used to construct the
proposed improvements and then removed. An existing 36" CMP culvert will also be
removed. Several of the distributary channels that have partially filled in due to lack of flow
will be cleaned out. We will re-construct the distributary channels that are required to fully
restore salt marsh circulation.
FIGURES 1 through 7 below further describe the Phase 1 of the Hamma Hamma River
Estuary Restoration Project.
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HAMMA HAMMA RIVER RESTORATION—PHASE 1: PROJECT DESCRIPTION NARRATIVE
AND DESIGN MEMO
By: Pat McCullough 4-24-10.
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HAMMA HAMMA RIVER RESTORATION— PHASE 1: PROJECT DESCRIPTION NARRATIVE
AND DESIGN MEMO
By: Pat McCullough 4-24-10.
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HAMMA HAMMA RIVER RESTORATION— PHASE 1: PROJECT DESCRIPTION NARRATIVE
AND DESIGN MEMO
By: Pat McCullough 4-24-10.
Phase 1 of the Hamma Hamma Estuary Restoration Project focuses on three of the
critical factors that have affected the Hamma Hamma estuary.
1. Floodplain Connectivity - In 1958, the landowner constructed a dike, placed riprap and
dredged the mouth of the river. A 1930s timber cruise map reveals a 0.3-mile long side
channel at river mile 0.8 that is no longer there. Diking and riprap reduce flood flow access
to the floodplain (WDFW and PNPTT 2000). An Ecosystem Diagnosis and Treatment (EDT)
model conducted for chinook in 2000-2001 determined that 10-40% of the lower river has
been disconnected from its floodplain. Floodplain connectivity is good on the north side but
has been disconnected from a slough on the south side (TAG 2003).
2. Loss of Floodplain Habitat - The majority of the floodplain is in agriculture, grazing or
residential use, which has impacted 35% of the riparian zone (WDFW and PNPTT 2000).
SR101 fills former tidal channel and salt marsh habitat, truncates the estuary, and
disconnects tidal channels (TAG 2003).
3. Large Woody Debris - Most large wood has been removed from the lower watershed,
reducing channel complexity and juvenile fish habitat. Large wood surveys conducted by
USFWS indicate 0.12 pieces of wood per meter or 4.14 pieces per channel width (average
35.6 m wide). In the 1100 meters surveyed, there were 24 rootwads, 27 small logs, 40
medium logs and 37 large logs. There were no key pieces (Carrie Cook-Tabor, unpublished
data, 1996). Reduction in riparian areas has reduced/eliminated recruitment sources for
large wood (WDFW and PNPTT 2000)
This project directly addresses several nearshore action recommendations developed for
the Hood Canal Coordinating Council (Lead Entity) through the Limiting Factors Analyses
(LFA) by the Washington State Conservation Commission and the Technical Advisory
Groups (TAG.) These actions are recommended to help achieve salmon recovery, taking
into account estuarine and nearshore processes and functions. The parameters used in the
LFA process include proximity to priority watersheds as assigned by the HCCC Salmon
Habitat Recovery Strategy, spatial scale, temporal scale, and ecological scale. Further, this
project is listed as a near-term action in both the Mid-Hood Canal Chinook salmon and
Hood Canal/Eastern Strait Summer Chum Salmon recovery plans.
At risks species resident in the Hamma Hamma River include ESA listed Chinook; Summer
Chum, and Steelhead. All species are expected to benefit from the project however, it is
hypothesized that ESA listed Summer Chum (O. kisutch) may benefit the most as their
juveniles remain in the nearshore and tidal areas longer than other salmonid species.
The Hamma Hamma River was diked in the early 1900's cutting off normal flow to the North
Fork and channelizing the South Fork, essentially cutting of the estuary function to Hood
Canal. Adult Chinook, Coho, Fall Chum, Pink, Steelhead, Cutthroat Trout and Summer
Chum are all easy prey for marine mammals as they return to their spawning beds due to
the channelization of the South Fork, in essence creating a gauntlet for adult salmonids to
navigate. The migratory escape route for juveniles is no less peril less as scores of shore
birds pick them off as they try to access the marine waters of Hood Canal.
10 1 Page
HAMMA HAMMA RIVER RESTORATION—PHASE 1: PROJECT DESCRIPTION NARRATIVE
AND DESIGN MEMO
By: Pat McCullough 4-24-10.
This hypothesis is directly supported by the NST Conceptual Model applied to the affects of
juvenile salmon resulting from a dike breach in a natal delta (Puget Sound Nearshore
Partnership Technical Report 2006-6).
The Hood Canal Coordinating Council (HCCC) "Salmon Habitat Recovery Strategy" has
identified the project as a TIER 1; Priority 1 habitat area based on current, presumed, and
historic distributions of ESA listed salmonid species. Moreover, the project is listed in the
HCCC 3 year ESA plan for Hood Canal.
The project has been previously reviewed by the SRFB (08-2158). Issues raised by the
TAG have been addressed and the budget revised.
1) PROJECT DESIGN
The project is located in the channelized river delta where the three (3) ELJ's are placed
and the off channel habitat will be located on the south side of and connected to the main
river channel.
The project is designed to minimize the need for ongoing maintenance or intervention to
sustain the nearshore functions restored due to two (2) primary considerations.
1. Engineered Log Jams (ELJ) as opposed to randomly placed Large Woody Debris (LWD)
is engineered in such a way as to minimize interaction with the river current or tidal actions.
Well anchored in the water body, ELJ will typically last the life of the composition material
which normally lasts 10-15 years. Moreover, natural LWD recruitment over time will tend to
replace the engineered material as it reaches the end of its lifecycle.
2. The off channel restoration portion of the project is protected from normal course gravel
aggradations as it is outside the limits of the main river channel and protected by the
existing river dike. Tidal actions will over time affect the reconstructed off channel habitat
making it even more natural and therefore more productive. In addition, the planting of
aquatic plants will enhance this process.
Direct beneficial habitat attributes include: Increased tidal channel complexity; Emergent
marsh vegetation; Salinity; Turbidity; Temperature; Increase benthic and insect production.
Direct beneficial functions include: Increase in residence time; improved physiological
transition; increase survival due to avoidance of predators; increase food consumption
As can be seen in the supplied pictures and map, the project is positioned in the landscape
in order to maximize the benefits of in channel protection afforded by the ELJs and
restoration of off channel rearing habitat for juvenile salmonids. The off channel habitat is
perhaps the most important feature of the project as the landowner is unwilling to allow
removal of the existing dikes in order to allow us to reintroduce natural meander to the tidal
and nearshore estuary. The off channel habitat is the next best alternative while the ELJ
placed in the diked river channel will tend to recruit LWD providing cover and the
development of pools in the channel over time. This cover is increasingly important as it
tends to deter predatory seals.
11 � � ge
HAMMA HAMMA RIVER RESTORATION—PHASE 1: PROJECT DESCRIPTION NARRATIVE
AND DESIGN MEMO
By: Pat McCullough 4-24-10.
It is hypothesized that these actions will affect several ecosystem processes including tidal
hydrology, sediment movements, and cycling of organic matter. As a result of the dike
breaching, new tidal channels will form, sediment will be deposited in the restoring marsh,
and the development of a new plant community will result in more organic matter and food
items being available. How new tidal channels develop (e.g., position, length and depth) will
depend upon a number of factors such as where the dike is removed, how much of the dike
is removed, size of the new wetland, and where in the estuary the new wetland is located. A
number of habitat attributes will change. For example, opportunity will increase by adding
new habitat that was previously unavailable. This will be further influenced by connectivity of
the new channels. Habitat capacity will also increase as a result of more prey (such as
insects) being produced as new vegetation grows.
Assuming the delta is at carrying capacity, the addition of new tidal habitat will increase the
number of delta fry that can rear in the estuary, residence time of fish in the delta, and
growth of fish associated with this life history strategy. Ultimately, the addition of the new
tidal channels will increase population viability by altering the distribution and composition of
life history strategies and increasing spatial structure by creating new habitat, thereby
spreading the population out in space and time. Productivity will also be strongly affected
because more salmon of one of the dominant life history strategies will survive which in turn
will affect abundance of returning adults (Beamer et al. 2005).
The Hamma Hamma has been a test multi-species restoration river for 12 twelve years.
Long Live the Kings, the WDFW, the HCSEG, the Robbins family and the Skokomish Tribe
are an integral part to of this project by conducting adult surveys both live and dead as well
as out migrating smolt surveys utilizing a screw trap and hundreds of hours of volunteer
time in the process. Currently the community collation raises and performs research on
Steelhead, Summer Chum, Fall Chum, Chinook and Pinks, and plans to continue
indefinitely.
Included with the project description narrative is Appendix A: ELJ Engineering Design
Calculations by Pat McCullough, PE and Mike Dully, PE and Appendix B: Hydraulic
Analysis of Proposed Engineered Log Jams in the Lower Hamma Hamma River by Doug
Johnson, PE. The design of the ELJ's and the habitat structures has been carefully crafted
to resist both the momentum forces of the Hamma Hamma during flood stage and the
buoyancy forces imposed on the structures by the daily flooding from tidal inundation. All
the structures will be anchored by fill material and buried concrete blocks. The LWD will
anchored and tightly strapped together with galvanized chain or cable to prevent movement
from tidal or momentum forces.
121Page
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/ �y SHEET 1 COVER SHEET
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"' - `" 3 SHEET 2 ESTUARY RESTORATION PLAN ADJ. ADJUST MAX. MAXIMUM
�
i, - ' . SHEET 3 ELJ PLAN & DETAILS ATB ASPHALT TREATED BASE MIN. MINIMUM
�,,�► HAMA4a HAMMA Ri1lRR SHEET 4 HABITAT STRUCTURE PLAN AND DETAILS. BK. BACK f e N.LC. NOT IN CONTRACT
1 SHEET 5 UPSTREAM BANK PROTECTION PLANS & DETAILS BOT. BOTTOM N.T.S. NO TO SCALE
s T
CENTERLINE O.C. ON CENTER
REG. REQUIRED
ti C.J. CONSTRUCTION JOINT
CLR. CLEAR REIkF. REINFORCEMENT
1 0_ I. ,.`'� CO CONT. CONTINUOUS SHLD. SHOULDER
r MA'at)-kc .^ CSBC CRUSHED SURFACING BASE COURSE SPA. SPACES i
SQ. SQUARE
✓ CTR. CENTER STD. STANDARD HOOK
/ s I DIA. DIAMETER SYM, SYMMETRICAL
EA. EACH TYP. TYPICAL
1 PROJECT LOCATION MAP ` �'; E.F. EACH FACE
{' ELEV. ELEVATION
1
k i EQ. EQUAL
EXIST EXISTING
/ HMA HOT MIX ASPHALT CONCRETE
1
PROJECT LOCATION
I1
/
_� TIDAL CHART
GENERAL NOTES ;,` " MLL NAVD e8 2 10.58
MHi 11 76
1 ALL MATERIAL AND WORKMANSHIP SHALL BE IN ACCORDANCE WITH THE ""' w 10,50 7-
1 REQUIREMENTS OF THE WASHINGTON STATE DEPARTMENT OF TRANSPORTAMN T11
4 2
STANDARD SPECIFICATIONS FOR ROAD, BRIDGE AND MUNICIPAL CONSTRUCTION
/ (ENGLISH) DATED 2006, AND AMENDMENTS. NOTE: THE N - .5AVD 88 DATUM WAS USED TO DEVELOP
I/ G WORK. THESE PLANS. THE CONVERSION FROM NAVD 88 DATUM
2, THE CONTRACTOR SHALL LOCATE ALL UNDERGROUND UTILITIES PRIOR TO BEGINNIN
TO MLLW WATER DATUM IS 2.62 FEET.
I
I yeca (O
Apprvved BM: Drawn OF °''"' HOOO CANAL SALMON ENHANCEMENT GROUP
�1 Ls �-�� rESA
Engineering Sertrices AssociatesNWtm ,s,,,�
LS 9-to-A tomied on 3Uawtifid Abod Lana[ �,p„ COVER SHEET
_ 9-10-09 ' N.d 8,o ch.,rok.. a.aoh t9�ad f 5
Pm= A1,/bir, Ia. 9858B /.916'o) .mf--y9BI
Deft By Arw—
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1
HABITAT STRUCTURES- TOTAL OF 3
`.� GROUPINGS. SEE SHEET 4 FOR DETAILS.
LOG STRUCTURES TO
THEBANK T 14 /x00
UPSTREAM OF THE
'ROPOSED ELF. TOTAL �NC�iO �• 350' LONG X 20' WIDE TEMPORARY RIVER BYPASS
°ENGINEER lELO BY THE . \\ CHANNEL TO ALLOW THE ISOLATION OF THE ELJ AND
x. \.� HABITAT STRUCTURE CONSTRUCION OPERATIONS.
iEE SHEET 4 FOR , ��/STD ��1 \ F WHEN CONSTRUCTION IS COMPLETED BACKFILL THE
ETAILS. TEMPORARY CHANNEL TO EXISTING LINE AND GRADE
tic '9 AND DIRECT THE RIVER FLOW BACK TO THE ORIGINAL
G,Q Y ;� CHANNEL.
/00
sou-m BANK ;.;':'air q� �� ENGINEERED LOG JAM (ELJ) — TOTAL OF 2 —
' SEE ELJ PLAN, SHEET 3 FOR DETAILS.
�::::� \ EXISTING DISTRIBUTOR CHANNEL:
ELJ # t t .. REMOVE 36" CMP AND CLEAN OUT
STA: 4+71 EXISTING DISTRIBUTION CHANNEL AS
\— :• OFFS R / f� F.r �` DIRECTED BY THE ENGINEER.
� J
ti
/ POCKET V; c'Pi �.
ESTUARY /
1 ACRE „•, �, � p J
A: /
/ '...y.. OFFS ::.5' . ....
1 ::... :''::::.:::. ' AT i ! Iyt A Rt�w:. : .........
VER
. ....... . ... sx
POCKET
APPROXIMATE BOUNDARY ~ ESTUARY A a /
OF EXISTING POCKET ESTUARI 1.54 ACRES
FOR THE SOUTH SIDE OF THE
HAMMA HAMMA ROVER. \ ` REMOVE THE EXISTING ACCESS
\ o// ROAD AND REGRADE TO 12
BELOW THE SURROUNDING
GROUND AFTER CONSTRUCTION
IS COMPLETE.
RE-CONSTRUCT 50 FEET OF
DISTRIBUTARY CHANNEL
I AFTER EXISTING ACCESS
ROADWAY IS REMOVED.
I i
ESTUARY RESTORATION PLAN
SCALE f- 4V
I to
Appra-d ey —mum bir
"mei H0010 CANAL SALMON ENHANCEMENT GROUP
- — PHM 9_t ' Engineering Services Associates , ,�sncw _ 2
P "'d--� 4' JL� � Located an erok" r .sue cd►,et ..,t AS snow ESTUARY RESTORATION PLAN 5
,.m CMa A'.d'. P10 L�riotN 6irach /id�ad 0
ray�o A mwd Th 4-10-Op 61rl�hir, Ia 98588 r960/ 8?5-998� Jb!1�b
Afn fAr•4� Au rAwt Am� - '
I
EXCAVATE AN FILL NOTES — E<J AND HABITAT STUOTURE
`` TO E
�\ r LEVATION +10 ANCHORING SPECIFICATIONS
EXIST WG TOP OF BANK Elv +B---" 6 TOP
R �tr +
JAIDULt 1, DRIVE PILING INTO STREAM BED 11 FEET
BOTTOM OF LUG ELV -3 r B / DEEP. BACKFILL IF NECESSARY.
RIVER LAYOUT LINE - TO BE EXCAVATE HOLE DEPTH TO ELY/s
STAKED IN THE FIELD BY THE R/VE �JUNG 11 ET/ 2. ATTACH AND BURY ECOLOGY BLOCKS OR
ENGINEER. DEEP INTO CHANNEL BED - TYP. 3,600 LB BOULDERS ACCORDING TO THE
URY LOGS 20 18 AND 15 FOLLOWING SPECIFICATIONS: 1. CONSTRUCT
1 x M do A* A 24' WADE BY 26' LONG PAD AREA IN
WHICH TO SET 42 - 2'X2'X6' ECOLOGY
ENGINEERED LOG JAMS: TOTAL BLOCKS BELOW EACH ELJ, 2. PLACE
I OF 2 STRUCTURES. ECOLOGY BLOCKS ON THE PAD AND CHAIN
TO BE LOCATED IN THE FIELD BY ELEVATION - TYPICAL SECTION OR CABLE THE BLOCKS TOGETHER AND
THE ENGINEER. SCALE 1' - 2V THEN TO THE BOTTOM LEVEL OF THE LOGS.
BOMIDDLE OFER OF SD THE
TTOA LAYER THE LOGAN THE
\ TOP LAYER OF THE LOGS TO THE MIDDLE
LAYER OF THE LOGS, NOTCH AND DRILL
1 THE LOGS WHERE NECESSARY TO ASSURE
8OU111 am ,. — THAT THE ENTIRE LOG ASSEMBLY IS
TIGHTLY SECURED. USE HALF INCH
x ORIENT ELJ LOGS
GALVANIZED CHAIN TO TIE THE LOGS TO
TO ANGLE THE ECOLOGY BLOCKS AND TO EACH
ACCORDINGLY OTHER.
W4 71 1 3. CONNECT PILING TO LAYER 2 AND LAYER 3
LOGS
AN (GRADE 30) OR CABLE.5/8- LASNING
C
\ p.�#2 __� �. � n row 4. HABITAT LOGS ANCHORING: USE B 4000 LB
. 5+97 R l� ' ROCKS OR ECOLOGY BLOCKS FOR EACH
ANCHORING
LAYOUT f / SCHEME UCTURE. USE THE E EME DESCRIBED ABOVE ANCHOR
CONTROL a THE HABITAT STRUCTURES.
POINT
GENERAL P jPALAN AN — TYPICAL
1 -
ELJ AND HABITATE_STRUCTURE LAYOUT
SCALE 1--60'
I
I LOG QUANTITY
I TYPE # DIAMETER LENGTH ROOTWAD FOR ELJ 1
f i
i
1
O16' TO 20' 20' YES 6 1 1 1 rTriG eA►rc/
J� Q
I �
i
O 24' TO 36' YES 3 A
O LOGS USED 4
OFOR PILING 2
YES 3 3 KEY LOGS BURRIED
O FROM ELV -3.5 rO
.TO ELV 0 0
I ' � :•,�o ti 2 0
I 3 :may h
PLAN - BOTTOM LAYER TYP. PLAN - MIDDLE LAYER TYP. PLAN - TOP LAYER TYP,
SCALE 1'-IW SCALE 1'-10' SCALE 1'-10'
` PRELIMINARY DESIGN - NOT FOR CONSTRUCTION
yw
scow
a�
-- - i `"re-d ar mra ft aw ,a-°1d'o-a Engtineering Serutices Assocfates 4 saw HOO10 CANAL SALMON ENHANCEMENT GROUP 13
• � r..e As Barr 8LT PLAN AND DETAILS ,�j
— r.,,••• 9-10-0� nrr 8>0 c�rox.. a►ach Raor �
�owAy Hpy v,�d zw oir, ra 9B6PB (3Gof P9'6--9'38I
r.$b JYV{tfoQ OaNE1 {-4 2011
1
NOTES — HABITAT STUCTURE ANCHORING
I SPECIFICATIONS
1. ATTACH AND BURY ECOLOGY BLOCKS OR
3,600 LB BOULDERS ACCORDING TO THE
I \ FOLLOWING SPECIFICATIONS. 1. CONSTRUCT
K
UNDER THE EXSITNG BANK`IN A WHICH TO
HABITAT STRUCTURES — 3 — 30 �HABITS ST ECOLOGY
I PLACE w
FOOT LOGS WITH ROOT WADES ECOLOGY BLOCKS ON THE PAD AND CHAIN
LAID INTO THE BANK AND 2— 20 OR CABLE THE BLOCKS TOGETHER AND
FOOT LOGS WITH ROOT WADS THEN TO THE BOTTOM LEVEL OF THE LOGS.
LAID PARALLEL TO THE RIVER. CHAIN TOP LAYER OF LOGS TO THE
tiq SHEET.ANCHOR AS DESCRIBED ON THIS BOTTOM
TLAYER
THE BOTr THE LOGS,
�YER OF LOGS
WAD LOGS. NOTCH AND DRILL THE LOGS
Il
- , ' y9� TOTAL OF 3 STRUCTURES. TIRE LOG ASSEMBLY IS TIGHTLYERE NECESSARY TO ASSURE AT THE
"pi TO BE LOCATED IN THE FIELD BY SECURED. USE HALF INCH GALVANIZED
` & THE ENGINEER. CHAIN TO TIE THE LOGS TO THE ECOLOGY
south SANK BLOCKS AND TO EACH OTHER.
LAYOUT
CONTROL
i POINT
i
FL J AND H BITATE STRUCTURE LAYOUT
SCALE,r-W
4 4 FINISHED GRADE AND TOP OF BANK
LOG QUANTITY 2
TYPE # DIAMETER LENGTH ROOTWAD FOR HS 3
i
U1 ,s•to,e 3s' No 3 1 4 3 4
--�-�.
EXISTING CHANNEL 2
BOTTOM.
O1Y To 18" 33 NO 3 o O o 0
i o 0 0 0 0
O30 YES 3 0 O 0 o O
0 0 0 0 0 CONCRETE ANCHOR
1 BLOCKS SEE NOTE 1
4 sa• 3W YES s THIS SHEET.
ALL EXCAVATION OUTSIDE OHW. MAKE 20 FOOT
HORIZONTAL EMBENDMENT IN THE BANK (MIN.).
BACKFILL WITH IMPORTED SAND AND GRAVEL FILL.
i
C� PRELIMINARY DESIGN — NOT FOR CONSTRUCTION
vj ►1
HOOD CANAL SALMON ENHANCEMENT GROUP
asro+�+e1R �
e-lo-os Bngtrleering Serlrices Assocwtes ,S,�,�„ 4
,v ,t�oo,.d> � ebow r.,t s�llaw HABITAT STRUCTURE or Jc
PLAN AND DETAILS
INN rmf.I Aw /art A a�.ai,im. rtiriwM em,
I
R1 OCKS SHALL BE SOUND AND FREE FROM CRACKS, SEAMS, AND OTHER DEFECTS THAT WOULD Y LOGS TO BE
1 TEND TO INCREASE FROM WEATHERING, FREEZING, AND THAWING, OR OTHER NATURAL CAUSES. THE LOCATED IN THE FIELD
LEAST DIMENSION OF AN INDIVIDUAL ROCK FRAGMENT SHALL NOT BE LESS THAN ONE-THIRD THE
I GREATEST DIMENSION OF THE FRAGMENT. BY THE ENGINEER.
CHAl DETAILS (REFER TO TYPICAL LOG PLACEMENT AND CHAIN/SHACKLE DETAIL-& THIS SHEET)1 9
1. PLACE BOULDERS ON SEDIMENT SURFACE, UPSTREAM OF LOG. h
2. CABLE SHALL PASS THROUGH PREDRILLED 3' MIN DIA HOLE IN BOULDER. (HOLE SHOULD BE q
1 LARGE ENOUGH TO PASS A CABLE EYE). M�
1 3. INDIVIDUAL LOGS OF THE "r LOG SYSTEMS SHALL BE PLACED SUCH THAT THE BOTTOM LOG IS SOUni BANK i q � T Mort
ANGLED DOWNSTREAM AND THE TOP LOG LIES PERPENDICULAR TO FLOW. (SEE Y-LOG SYSTEM
DETAIL, THIS SHEET).
I �
4. EACH LOG SHALL BE ANCHORED TO AT LEAST TWO BOULDERS, BOTH ON LONG ENOUGH TETHERS
I TO FLOAT THE LOG TO ORDINARY HIGH WATER PLUS 2-FEET (4-FEET MIN TETHER LENGTH). 3" MIN
DIA HOLES SHALL BE DRILLED THROUGH LOGS APPROXIMATELY 6-FEET FROM EITHER END OF LOG.
(HOLES SHALL BE LARGE ENOUGH TO PASS THE CHAIN). THE CHAIN SHALL PASS THROUGH DRILL Y LOG BANK PROTECTION — PLAN
N HOLE IN LOG THEN WRAP AROUND LOG A MINIMUM OF ONE FULL WRAP AROUND THE
SCALE: 1"=60
CIRCUMFERENCE OF THE LOG. EACH CHAIN SHALL BE SECURED TO LOGS AND A MINIMUM OF ONE
1 FULL WRAP AROUND THE CIRCUMFERENCE OF THE LOG. EACH CHAIN SHALL BE SECURED TO LOGS
WITH A MIMMUM OF ONE FULL WRAP AROUND CIRCUMFERENCE OF THE LOG.
S. IF LOG HAS A ROOTWAD ATTACHED, THE ROOTWAD SHALL BE PLACED AGAINST THE BANK.
1 6. CARE SHOULD BE TAKEN TO AVOID FORMING KINKS IN THE CHAIN. GRAPHIC SCALE
DIMENSIONS
r r s ar
CF cRA NO BALLAST FOR NEW LOGS
I 1. THE OBJECTIVES OF THE PROJECT ARE TO ENHANCE FISH HABITAT THROUGH THE STABILIZATION LOG W/ ROOTWAD 4.000 L8 MIN -- 3.5' MIN DIA
AND RECRUITMENT OF LARGE WOODY DEBRIS AND TO ENCOURAGE DEP0511ON ALONG THE SEVERELY LOG W/ ROOTWAD 4,000 LB MIN -- 3.5' MIN DIA N fee k w n
U
ERODING RIVER BANK. FLOATING LOG GRAINS OFFER A LOW COST, FISH-MENDLY MEANS OF (UNLESS STATED OTHERWISE IN PLAN VIEW)
' MEETING THESE OBJECTIVES. BECAUSE THEY FLOAT DURING ORDINARY HIGH WATER EVENTS, THEIR
PRESENCE BREAKS UP THE LINE OF FLOW AND DISSIPATES ENERGY, THEREBY ENCOURAGING NEW LOGS
I SEDIMENT DEPOSITION DOWNSTREAM. FLOATING GROINS ALSO HAVE THE POTENTIAL TO RECRUIT DIAMETER: 15-24'
WOOD FLOATING DOWNSTREAM THAT MAY OTHERWISE HAVE PASSED ON THROUGH THE SYSTEM. LENGTH: 25-30'
' 2. GROINS SHOULD BE SPACED 2.5 TO 3 TIMES THEIR EFFECTIVE LENGTH. SPECIES: ANY, WITH THE EXCEPTION OF RED ALDER. WESTERN RED
1 3. GRADING SHALL 8E U CEDAR AND DOUGLAS FIR ARE PREFERRED.NITED TO THAT REQUIRED 7O INSTALL THE ACCESS ROAD AND ROCK APPROXIMATE AVERAGE dSMETER FOR BALLAST
GRAIN, AND TO KEY IN THE EXISTING HARDPOINT AT THE UPSTREAM END OF THE PROJECT AREA. NEW LOGS SHALL BE SOUND AND FREE OF DECAY. OF EXISTING MATERIAL
IN-STREAM EXCAVATION SHALL BE MINIMIZED.
BALLAST(l8) N0. BOULBERS APPROX. BOULDER DIAMETER
4. ANY DISTURBANCE TO EXISTING VEGETATION SHALL BE MINIMIZED. 8,000 2 3.5'
8,400 2 3.5'
LOG 9,200 2 3.8'
10,100 2 4.0'
11,500 2 4.1'
OHWMISY OHWM 12,800 3 3.6,
26,000 5 4.0'
NOTE FEWER BUT LARGER BOULDERS MAY BE USED TO MAKE
UP THE TOTAL REQUIRED BALLAST. HOWEVER. THE MINIMUM
NUMBER OF BOULDERS PER LOG SHALL BE M.
BOULDER BALLAST TOTAL LENGTH VARIES WITH EACH APPLICATION
(CHAINED TO LOG)
5.
r-/ 11
NOTE: LOWER LOG OF Y-LOG SYSTEM IS NOT SHOWN
Pio-�====
� BANK NTS R$FPAREO CABLE
'L BOULDER BALLAST (I TYPICAL LOG PLACEMENT — ELEVATION VIEW PRELIMINARY DESIGN — NOT FOR CONSTRUCTION
(CHAINED TO LOG) PRESSED EYE
r � LOG 1_
2 GALVANIZED CHAIN
OH'AM
LOG
Z l0
ry = RUN TOP LOOP OF CABLE THROUGH HOLE CROSBY BOLT TYPE
FLOW DRILLED IN LOG, WRAP CHAIN AROUND LOG ANCHOR SHACKLE OR
�� M / \ TWICE AND FASTEN CABLE EYE WITH SHACKLE GALVANIZED GHAIN SHACKLE
N BLOULDER BALLAST
ram) TE: LOWER LOG OF Y-LOG "�
TEM IS NOT SHOWN RUN BOTTOM OF CHAIN
I DRILLED THROUGH HOLE DRED PRESSED EYE AND SHACKLE
(r/) IN BOULDERTWu� ATTACHMENT TO LOG
BOUNDER BALLAST CAL Two„ DAYS� Y—LOG — PLAN VIEW ,�,�,�„m
"
1.eoaaz
s YPICAL LOG PLACEMENT — SECTION VIEW CHAIN/SHACKLE DETAIL
PRELIMINARY — NOT FOR CONSTRUCTION NTs NTS
s - •y A OF �� �u 9D tv �`°'*' HOOD CANAL SALMON ENHANCEMENT GROUP Jc
-2st 7—� E'ngineeriny Services Associates ,�'
a;Sri° P �d 9-'D-� /y oft t9{jW AW Ca ►.,,. �•a� Y LOG BANK PROTECTION f 5
PHM sl-lo-a L/ ,►ref xro CA*m m ate► AMd PLAN AND DETAILS
Approved dM(�E:tir, I'a 986.A (98'0).Y76-7SW
� No.1/at� B1l Ckd Appr lbvision pltMl� 6-a-tot t