DESIGN CONSIDERATIONS OF CONSTRUCTION OF EMBANKMENT

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Presentation transcript:

DESIGN CONSIDERATIONS OF CONSTRUCTION OF EMBANKMENT Taken up by Local Government Engineering Department

Typical Section of Embankment

Types of Embankment Submersible Flood Embankments It is designed mainly to protect boro rice from the pre-monsoon floods During monsoon season these embankments remain submerged and cannot be used for communication

Types of Embankment High Flood Embankments It is designed mainly to protect the subproject area from inundation by excluding both pre-monsoon and monsoon high floods.

Design Considerations Height of Embankment Height of embankment or crest level of embankment is fixed up to maintain integrity of the embankment for protection against the design flood. Crest level of embankment= Design Flood Level + Free Board

Design Considerations Crest Width of Embankment Crest width should be designed taking into account soil stability (seepage and slope sliding) and future use of the embankment. Generally crest width is fixed considering standard crest width of road.

Design Considerations Side Slope of Embankment Side slope should also be designed taking into account soil stability (seepage and slope sliding) and future use of the embankment. Phreatic line analysis and slope stability check should be considered to select the design slope and overall embankment width.

Phreatic Line Analysis

Fig: Swedish Slip Circle Method Slope Stability Check Fig: Swedish Slip Circle Method

Design Considerations Set Back Distance The minimum design set back distance, including re-sectioning of existing embankments, shall be 3.0 m. Approximate embankment set back distance (SB) can be determined from the following relation. SB = Ze x Dch Where: SB = embankment set back distance (m) Ze = side slope of embankment Dch = depth of channel (m)

Set Distance Calculation

Design Considerations Submersible Flood Embankments Design Water Level - 1:10-year Pre-monsoon HFL Freeboard - 0.30 m Crest Width - 2.50 m Side Slopes - 1:2

Design Considerations High Flood Embankments Design Water Level - 1:20-year Annual HFL Freeboard - 0.60 m Crest Width - Minimum 2.50 m Side Slopes - Maximum 1V: 1.5H

Standard Crest Width of Road Embankment Road Grade Required crest width (m) Upazila Road 7.32 m/9.8 m Union Road 5.5 m Village Road-type1 4.8 m Village Road-type2 4.2 m

Recommended Embankment Side Slope Embankment Height (m) Side Slope (V:H) 0 – 1.99 1:1.5 2.00 – 3.99 1 : 2 4.00 – 4.99 1 : 2.5 5 and above Determine from detail slope stability analysis

Reference: Small Scale Water Resources Subproject Planning And Design Guidelines, March-2004