Salmon NMFS Stream Crossings 9/2001 Flashcards Preview

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Flashcards in Salmon NMFS Stream Crossings 9/2001 Deck (26):
1

5 alternatives and structure types, in order of preference

1. Nothing
2. Bridge -- allow for long-term dynamic stability
3. Streambed simulation strategies--e.g. bottomless arch, embedded culvert, ford
4. Non-embedded culvert--i.e., "hydraulic design" e.g., low slopes
5. Baffled culvert, or structure designed with a fishway, for steeper slopes

2

Simplified design method intended to size a culvert sufficiently large and embedded deep enough into the channel to allow for the natural movement of bedload and formation of a stable bed inside the culvert.

Active Channel Design Method

3

Stream channel types ill-suited for the Active Channel Design Method

1. > 3% naturals slope
2. >100 ft culvert lengths

4

2 stream channel types ill-suited for the Active Channel Design Method

1. > 3% naturals slope
2. >100 ft culvert lengths

5

3 parameters of Active Channel Design Method

1. Culvert width: = or > bankfull channel width, no less than 6 ft wide
2. Culvert slope: Shall approximate slope of the stream reach. Max slope

6

3 parameters of Active Channel Design Method

1. Culvert width: = or > 1.5 times active channel width,
2. Culvert slope: Shall be 0% slope
3. Embedment: Culvert bottom buried >20% of culvert height at outlet and

7

3 parameters of Stream Simulation Design Method

1. Culvert width: = or > bankfull channel width, no less than 6 ft wide
2. Culvert slope: Shall approximate slope of the stream reach. Max slope 30% of culvert height and

8

A design process that matches the hydraulic performance of a culvert with the swimming abilities of a target species and age class of fish

Stream Simulation Design Method

9

3 criteria for of Active Channel Design Method

1. Culvert width: = or > 1.5 times active channel width,
2. Culvert slope: Shall be 0% slope
3. Embedment: Culvert bottom buried >20% of culvert height at outlet and

10

3 criteria for Stream Simulation Design Method

1. Culvert width: = or > bankfull channel width, no less than 6 ft wide
2. Culvert slope: Shall approximate slope of the stream reach. Max slope 30% of culvert height and

11

3 pieces of information needed for the Stream Simulation Design Method

1) Hydrologic data analysis
2) open channel flow hydraulic calculations
3) Info on swimming ability and behavior of target fish

12

A design process that matches the hydraulic performance of a culvert with the swimming abilities of a target species and age class of fish

Hydraulic Design Method

13

3 pieces of information needed for the Hydraulic Design Method

1) Hydrologic data analysis
2) open channel flow hydraulic calculations
3) Info on swimming ability and behavior of target fish

14

3 criteria for of Active Channel Design Method

1. Culvert width: = or > 1.5 times active channel width,
2. Culvert slope: Shall be 0% slope
3. Embedment: Culvert bottom buried >20% of culvert height at outlet and

15

3 criteria for Stream Simulation Design Method

1. Culvert width: = or > bankfull channel width, no less than 6 ft wide
2. Culvert slope: Shall approximate slope of the stream reach. Max slope 30% of culvert height and

16

3 criteria for Hydrualic Design Method

1. Culvert width: > 3 feet,
2. Culvert slope: Shall be 1 foot. When phys poss, bottom shall be buried >20% of culvert height below the elevation of the tailwater control point downstream of the culvert. When phys conditions preclude embedment, the hydraulic drop at the outlet of the culvert shall not exceed the limits above

17

3 pieces of information needed for the Hydraulic Method

1) Hydrologic data analysis
2) open channel flow hydraulic calculations
3) Info on swimming ability and behavior of target fish

18

A design process that matches the hydraulic performance of a culvert with the swimming abilities of a target species and age class of fish

Stream Simulation Design Method

19

3 criteria for Stream Simulation Design Method

1. Culvert width: = or > bankfull channel width, no less than 6 ft wide
2. Culvert slope: Shall approximate slope of the stream reach. Max slope 30% of culvert height and

20

A design process intended to mimic the natural stream processes within a culvert

Stream Simulation Design Method

21

3 parameters of Active Channel Design Method

1. Culvert width: = or > 1.5 times active channel width,
2. Culvert slope: Shall be 0% slope
3. Embedment: Culvert bottom buried >20% of culvert height at outlet and

22

A design process intended to mimic the natural stream processes within a culvert

Stream Simulation Design Method

23

Typical structures employed when using the Stream Simulation Design Method

Open bottomed arches or boxes

24

Stream Simulation Design Method vs. Active Channel Design Method

S.S requires greater level of hydrology and geomorphology information, and higher level of engineering expertise

25

2 Design criteria for Hydraulic Design Method

Low and HIgh Fish Passage Design Flow

26

3 parameters of Active Channel Design Method

1. Culvert width: = or > 1.5 times active channel width (~OHW),
2. Culvert slope: Shall be 0% slope
3. Embedment: Culvert bottom buried >20% of culvert height at outlet and