View source for 12 Survey, Design and Procurement

=== Embankment Design Criteria ===
There are three types of full flood protection embankment aimed to prevent entry into the polder of the highest flood flows, and, in coastal areas, to prevent entry of tidal floods and surges, and saline water:

# '''marginal''' dykes along small rivers/canals
# '''interior''' dykes along big rivers
# '''sea dykes''' along sea faces or large rivers close to the sea. 

The embankment crest level is designed either: (a) for a 1 in 20 year flood plus a freeboard allowance to protect agricultural assets; or (b) for a 1 in 100 year flood plus a freeboard allowance to protect against loss of human life, property and installations (especially along Jamuna, Padma and Meghna Rivers). The free board depends on the fetch (the normal distance from windward shore to the embankment affected) and wind characteristics. It allows for wave height, wave run-up height and a factor of safety against overtopping. For BWDB embankments in the coastal region, freeboard usually varies from 0.30m to 1.00m depending on the type of embankment.
{| class="wikitable"
|+'''Table 12.1 Embankment Types, Slope and Crest Width'''
!'''Dyke'''
! colspan="2" |'''Slope'''
!'''Crest width'''

(m)
|-
|Marginal
|country side

river side
|1V:2H

1V:2H
|2.44
|-
|interior
|country side

river side 
|1V:2H

1V:3H
|4.30
|-
|sea dyke
|country side

river side 
|from 1V:2H to  1V:3H

from 1V:5H to  1V:7H
|by  calculation
|}
{| class="wikitable mw-collapsible"
|+'''Table 12.2 Design Crest Levels and Widths for Blue Gold Polders'''<ref>{{Cite book|last=|first=|title=Standard Design Criteria|publisher=Standard Design Manual Committee, BWDB Chief Engineer (Design)|year=|isbn=|series=Standard Design Manual|volume=Volume 1|location=|publication-date=June 1995|pages=}}</ref>
!'''Polder'''
!'''Type'''
!'''Crest Level''' 

(m PWD)
!'''Crest Width'''

(m)
|-
!'''2'''
|interior
|4.30
|4.30
|-
!'''22'''
|interior
|4.30
|4.30
|-
!'''25'''
|interior
|4.30
|4.30
|-
!'''26'''
|interior
|4.30
|4.30
|-
!'''27/1'''
|interior
|4.30
|4.30
|-
!'''27/2'''
|interior
|4.30
|4.30
|-
!'''28/1'''
|interior
|4.30
|4.30
|-
!'''28/2'''
|interior
|4.30
|4.30
|-
!'''29'''
|interior
|4.30
|4.30
|-
!'''30'''
|interior
|4.30
|4.30
|-
!'''31-part'''
|interior
|4.30
|4.30
|-
!'''34/2-part'''
|interior
|4.30
|4.30
|-
!'''43/1A'''
|marginal

interior
|4.30

4.30
|2.44

4.30
|-
!'''43/2A'''
|marginal

interior
|4.30

4.30
|2.44

4.30
|-
!'''43/2B'''
|marginal

interior
|4.30

4.30
|2.44

4.30
|-
!'''43/2D'''
|marginal

interior
|4.30

4.30
|2.44

4.30
|-
!'''43/2E'''
|marginal

interior
|4.30

4.30
|2.44

4.30
|-
!'''43/2F'''
|marginal

interior
|4.30

4.30
|2.44

4.30
|-
!'''55/2A'''
|marginal

interior
|4.30

4.30
|2.44

4.30
|-
!'''55/2C'''
|marginal

interior
|4.30

4.30
|2.44

4.30
|-
!'''47/3'''
|marginal

interior
|4.57

4.88
|2.44

4.30
|-
!'''47/4'''
|marginal

interior

sea dyke
|4.57

4.88

6.10
|2.44

4.30

4.30
|}