Habitat_Boulder_Specifications.pdf
PDF 64 KB Posted
- Attached to
- Duff Creek Aquatic Organism Passage Federal contract opportunity
- Solicitation number
- AG-9A40-S-16-0004
About this file
Boulder Habitat Specifications
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| Construction_Drawings_Rev_04_21.pdf | ||
| SF_30.pdf | ||
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| RFI_Bates_Construction.pdf | ||
| Habitat_Boulder_Specifications.pdf | ||
| SF-30_Amendment_No._3.pdf | ||
| Duff_Creek_Schedule_of_Items.xls | XLS spreadsheet | |
| SF-30_Amendment_No.2.pdf | ||
| RFI_March_21.pdf | ||
| Drawings_REV_2.pdf | ||
| Pre-bid_Notes.pdf | ||
| Duff_Creek_Schedule_of_Items.xls | XLS spreadsheet | |
| Drawings_REV_1.pdf | ||
| PART_IV.pdf | ||
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| EROSION_CONTROL_PLAN.pdf | ||
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| SOW.pdf | ||
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| Duff_Creek_Schedule_of_Items.xls | XLS spreadsheet |
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Text version
Habitat Boulder Specifications
Base on Washington Dept. of Fish and Wildlife “Water Crossing Design Guidelines” chapter 9-03.11(3) Habitat Boulders. It states that “habitat boulders shall be hard, sound and durable material, free from seams, cracks, and other defects tending to destroy its resistance to weather. Habitat boulder sizes are approximately as follows; see contract provision for sizes specified:”
Rock Size Approximate Size One Man 12”-18” Two Man 18”-28”
Three Man 28”-36” Four Man 36”-48” Five Man 48”-54” Six Man 54”-60”
Note 1: Approximate size can be determined by taking the average dimension of the three sizes of the rock; length, width, and thickness by use of the following calculation:
𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿ℎ + 𝑊𝑊𝑊𝑊𝑊𝑊𝐿𝐿ℎ + 𝑇𝑇ℎ𝑊𝑊𝑖𝑖𝑖𝑖𝐿𝐿𝐿𝐿𝑖𝑖𝑖𝑖
= 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝑊𝑊𝐴𝐴𝐴𝐴𝐿𝐿𝐿𝐿 𝑆𝑆𝑊𝑊𝑆𝑆𝐿𝐿
By using the average dimension calculated as above, exceptionally thin or narrow boulders meet the specification but would weigh less, not perform in the stream channel in the same fashion as a more compact shape, and would be difficult to place. For instance, 36x36x12 meets the average dimension spec (28”) for the largest 2-man rock, but it is a pancake with approximately 88% of the volume of a spheroid shape.
An alternative method for specifying habitat boulders would be to state the boulder size by the b axis (the intermediate dimension) as is commonly done when doing a pebble count or what is determined by sieve analysis. In addition, specify a minimum dimension which would exclude thin or narrow boulders (pancakes or pencils). An Example would be: Three Man rock with an intermediate dimension of 28”-36” with no dimension less than 20.”
Size, shape and placement of the boulders are essential to the longevity of the structure. A minimum of two rows of rocks form the weir. One row creates the crest over which the flow drops, the other row is below and slightly in front of the crest and prevents scour beneath the top row. Boulders used for weir and foundation rock should be sized on the basis of the stream design discharge and slope. Small, lower-gradient streams should use a minimum two-foot mean dimension rock. Larger, high-gradient streams require rock as large as four to six feet mean dimension.
In the document, it is prefer to have round and not angular rock.
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