Low_Water_Crossing_Drawing_1.pdf
PDF 12 KB Posted
- Attached to
- Demolition Svc Martin Co P. 03
- Solicitation number
- RFB 605 2400000543 3
- Issued by
- Letcher County, Kentucky
About this file
This is a conceptual drawing for a low-water crossing standard installation, providing technical specifications for stream channel construction projects. The drawing establishes design parameters for pipe installation within stream channels, including provisions for approach construction across floodplains and specifications for materials, dimensions, and clearances to ensure structural integrity and environmental compliance.
The standard specifies maximum pipe diameters of 24 to 36 inches with pipe inverts level to the original channel's low point. Construction requirements include no more than 12 inches of clearance between pipes, maximum fill height of 4 feet 6 inches from the low point of the original channel, and no more than 18 inches of fill coverage over pipes. All pipes and backfill must remain contained within the stream channel. Approach and access roadway construction across floodplains may involve excavation of unstable materials and replacement with riprap, crushed stone, or similar approved road construction materials; however, excavated materials must be disposed of outside the floodplain, and finished road surfaces cannot exceed 3 inches above the pre-construction floodplain surface beyond the top of banks. Only concrete or clean rock fill (no soil) may be used for fill material. The drawing notes that specific site conditions will determine final pipe quantities and other construction details, indicating this serves as a flexible template for project-specific adaptations.
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Text version
ATTACHMENT 1
NOTES:
1. This is a conceptual drawing. The number and size of pipes and other details will vary depending on specific site conditions.
2. The pipes and backfill must be contained within the stream channel as shown above. During the construction of the approaches and access roadway across the floodplain, unstable and unconsolidated materials unsuitable for roadways may be excavated and replaced with riprap, crushed stone, or other stable road construction materials. This may only be done, however, with the following provisions: (1) the disposal of excess, unconsolidated materials thus excavated must be outside of the floodplain and (2) the finished surface of the completed road may be no more than three inches (3”) above the pre-construction surface of the floodplain at any point beyond the top of banks.
no more than 12” clearance between pipes original groundline top of roadway original groundline concrete or clean rock fill only (no soil)
24” to 36” diameters only maximum fill height 4’6” from low point of original channel groundline after construction all pipe inverts should be level with the low point of the original channel no more than 18” of fill over pipes
LOW-WATER CROSSING
STANDARD DRAWING
Not to Scale
File details come from the government source that posted it. Updated .