Concurrent Sessions D: Design and Performance of Roughened Channels - Rock Weir Fish Passage Challenges

Transcription

1 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: 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 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.

2 Peoples Irrigation Dam fish bypass project

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4 fish passage project sponsored and funded by the Crooked River Watershed Council

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8 NRCS orthophoto, 2004

9 dam before bypass

10 google maps, 2013 dam fish bypass channel

11 gated culverts to irrigation dam log boom sheetpile weir bypass channel with 12 step-pool rock weirs

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13 looking upstream

14 looking upstream

15 dam Crooked River flow looking downstream

16 bypass channel design and hydraulic analysis by

17 with support from Portland Oregon

18 Dan Moore, P.E. Hydraulic Engineer Kip Yasumiishi, P.E. Civil Engineer

19 Dan Moore lifting the stop logs Kip Yasumiishi

20 Dan Moore lifting the stop logs Kip Yasumiishi

21 3 feet 20 feet

22 notch floor 1 foot below top of Peoples Dam

23 challenges for natural channel fish bypass of an 8-foot irrigation dam

24 Don t use much space (it s been donated)

25 Don t capture the whole river or let it take over the bypass

26 Don t put the bypass so close that the river seeps and sand boils into it.

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28 Build a stable channel.

29 Meet irrigation demand

30 river flow to dam to bypass Make sure the fish notice the bypass!

31 Make the fish passage channel passable by fish!

32 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.

33 a few issues related to hydrology and hydraulics

34 An upstream control on flow that isn t necessarily fish-friendly.

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37 Weir flow calculations are empirically based. head Q = CLH 1.5 weir length coefficient of discharge

38 Weir flow calculations are empirical. Q = CLH 1.5 varies with head weir height crest width and shape amount of submergence

39 sharp-crested? both H and h vary

40 broadcrested? weir length?

41 a few issues related to construction

42 de-watering inadequate lower end channel depth not achieved

43 project performance monitoring (This was expected and project modifications ensued.)

44 original sheet-pile weir more efficient than expected

45 Measured jump heights and velocities were good.

46 Pool volumes were good.

47 At higher flows

48 some streaming flow became dominant.

49 Flow depths began to exceed rock lining.

50 Crooked River backwater did not provide enough protection.

51 Crooked River backwater did not provide enough protection. to dam river flow bank damage

52 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)

53 sheetpile weir modifications

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57 dam Crooked River flow rock weirs added

58 hydraulic modeling with HecRAS

59 let s zoom in!

60 zoom in more!

61 new rock weirs

62 project cost: original work 168k modifications 63k

63 During de-watering for project modifications about 250 redband trout were rescued.

64 questions?