University of Massachusetts - Amherst ScholarWorks@UMass Amherst International Conference on Engineering and Ecohydrology for Fish Passage International Conference on Engineering and Ecohydrology for Fish Passage 2013 Jun 27th, 3:50 PM - 4:10 PM Concurrent Sessions D: Design and Performance of Roughened Channels - Rock Weir Fish Passage Challenges Daniel S. Moore P.E., USDA Natural Resources Conservation Service Kip Yasumiishi P.E., USDA Natural Resources Conservation Service Follow this and additional works at: http://scholarworks.umass.edu/fishpassage_conference Moore, Daniel S. and Yasumiishi, Kip, "Concurrent Sessions D: Design and Performance of Roughened Channels - Rock Weir Fish Passage Challenges" (2013). International Conference on Engineering and Ecohydrology for Fish Passage. 71. http://scholarworks.umass.edu/fishpassage_conference/2013/june27/71 This Event is brought to you for free and open access by the The Fish Passage Community at UMass Amherst at ScholarWorks@UMass Amherst. It has been accepted for inclusion in International Conference on Engineering and Ecohydrology for Fish Passage by an authorized administrator of ScholarWorks@UMass Amherst. For more information, please contact scholarworks@library.umass.edu.
Peoples Irrigation Dam fish bypass project
http://crookedriver.deschutesriver.org fish passage project sponsored and funded by the Crooked River Watershed Council
NRCS orthophoto, 2004
dam before bypass
google maps, 2013 dam fish bypass channel
gated culverts to irrigation dam log boom sheetpile weir bypass channel with 12 step-pool rock weirs
looking upstream
looking upstream
dam Crooked River flow looking downstream
bypass channel design and hydraulic analysis by
with support from Portland Oregon
Dan Moore, P.E. Hydraulic Engineer Kip Yasumiishi, P.E. Civil Engineer
Dan Moore lifting the stop logs Kip Yasumiishi
Dan Moore lifting the stop logs Kip Yasumiishi
3 feet 20 feet
notch floor 1 foot below top of Peoples Dam
challenges for natural channel fish bypass of an 8-foot irrigation dam
Don t use much space (it s been donated)
Don t capture the whole river or let it take over the bypass
Don t put the bypass so close that the river seeps and sand boils into it.
Build a stable channel.
Meet irrigation demand
river flow to dam to bypass Make sure the fish notice the bypass!
Make the fish passage channel passable by fish!
Meet regs assembled by fish experts. Fish can pass 90% of the time. Fish means all life stages. Pool to pool: 6 maximum. Flow within velocity ranges. Pools have depth & volume.
a few issues related to hydrology and hydraulics
An upstream control on flow that isn t necessarily fish-friendly.
Weir flow calculations are empirically based. head Q = CLH 1.5 weir length coefficient of discharge
Weir flow calculations are empirical. Q = CLH 1.5 varies with head weir height crest width and shape amount of submergence
sharp-crested? both H and h vary
broadcrested? weir length?
a few issues related to construction
de-watering inadequate lower end channel depth not achieved
project performance monitoring (This was expected and project modifications ensued.)
original sheet-pile weir more efficient than expected
Measured jump heights and velocities were good.
Pool volumes were good.
At higher flows
some streaming flow became dominant.
Flow depths began to exceed rock lining.
Crooked River backwater did not provide enough protection.
Crooked River backwater did not provide enough protection. to dam river flow bank damage
project modifications 1. reduce bypass flow at sheetpile weir (due to higher efficiency than expected) 2. add rock weirs at lower end (due to construction not obtaining design depth)
sheetpile weir modifications
dam Crooked River flow rock weirs added
hydraulic modeling with HecRAS
let s zoom in!
zoom in more!
new rock weirs
project cost: original work 168k modifications 63k
During de-watering for project modifications about 250 redband trout were rescued.
questions?