English version of the description of the product WIT. W.I.T.© The sediment information system W.I.T. © offers an unique combinations of tools which makes it possible to process data and prepare long-term dredging plans. W.I.T.© is a dynamic web-based GIS application where all data of the drainage system is stored centrally. Practical modules allow for the optimisation of maintenance dredging by calculating quantities dredged material, the testing of data quality and planning of maintenance dredging. The data can be visualized in tables, diagrams, charts and maps. W.I.T.© provides answers to the following questions: * Which waterways should be dredged? * How much material (sediment) to be dredged? * What is the quality (chemical and physical) of the dredged material? * What are the costs of the dredging operations? * Which disposal sites are available? Design W.I.T. © database The following geometric database is required: * Hydrological units (representative of culverts and channels). * The hydrological units are the basis of WIT and are stored in a GIS database (shape format). * The basic assumption here is to use -as much as possible- information of already existing GIS databases. * Properties (also known as attributes in terms of GIS) of the hydrological units (such as ID, length, maintenance profiles, qualities categories etc.) are defined in the database. It’s also possible to use Google-maps as basic information for the hydrological units.

1. Dhaka WASA - VEI project
11
Preparation
2.3 Long term Urban Dredging Plan (WIT)
• Dredging strategy
• Sediment growth figures
• Clustering drainage units to dredging units
• Needed budgets

2. 5
operational excellence - sustainable services - bilateral cooperation
5
Take-home message(s):
Long term Urban Dredging plans gives insights in needed budgets!
How many years is long term?
What is the difference between drainage unit and dredging unit?

3. 5
operational excellence - sustainable services - bilateral cooperation
5
Learning Objectives of the Topic/Session:
At the end of the session the participants will be able to:
1. Explain the importance of Long term Urban Dredging Plans (LUDP)
2. Identify needed figures for making LUDP’s
3. Explain your dredging strategy
4. Relation between data collection and long term planning

4. 5
operational excellence - sustainable services - bilateral cooperation
5
LUDP gives answers to
1. Where to dredge in order to meet your design and hydraulic
requirements
2. When to dredge in order to meet your design and hydraulic
requirements
3. Costs and thus needed budgets when dredging at a certain
place is required
Floods are caused when your drainage system does not fulfill your design
and hydraulic requirements

5. 5
operational excellence - sustainable services - bilateral cooperation
5
WIT: Data information
Feasibility plan
Dredging plan
Do: dredging!
Framework assessment: from required
hydraulic dimensions to dredging
strategy
LUDP
Side selection

6. 5
operational excellence - sustainable services - bilateral cooperation
5
Generating LUDP’s you need:
1. WIT data information: what is in there?
Hydrographic survey and sampling (2 out of 7 catchments are known)
2. Framework assessment = Dredging strategy
3. Operational “Do” methods & Unit prices (unit prices x amounts = costs)
4. Sediment growth figures
5. Defined dredging units (side selection)
6. LUDP module WIT

7. 5
operational excellence - sustainable services - bilateral cooperation
5
Dredging strategy (important!)
• Dredging strategy = Dhaka WASA policy!
• Highly related with hydraulic capacity of your drainage system!
• Budgets and dredging strategies are strongly related!
• Dredging strategy = intervention depth and corresponding
dredging profile (with or without base layer)

8. 5
operational excellence - sustainable services - bilateral cooperation
5
Dredging strategy: required hydraulic dimensions
intervention depths
Intervention depth
Question: how much you should remove to fulfill your requirements above?
What does this picture mean?
Answer: nothing! Actual sediment is still below intervention depth!
Which year do you have to intervene when requirements do not fullfill anymore (when
does sediment reach intervention depth)?
WIT calculates year and corresponding amounts and costs!

9. 5
operational excellence - sustainable services - bilateral cooperation
5
Dredging strategy Kalyanpur: redefined canal contruction to dredging profile
(in this case: intervention = dredging profile)
Define your dredging strategy in WIT
754 + 112 = 866 m3
Question 1: Dredging amount in
this drainage unit?
Question 2: dredging strategy in
Segunbagicha box culvert?
WIT: all & only sediment
(Or 50 %)

10. 5
operational excellence - sustainable services - bilateral cooperation
5
Operational “Do” methods and unit prices (1)
• Define dredging-, transport and disposal methods and link to
drainage units in WIT
• WIT visualize defined methods on maps,
Question: What characteristics has the drainage unit Segunbagicha Box culvert if it will be dredged?

11. 5
operational excellence - sustainable services - bilateral cooperation
5
• Over-estimated unit prices used in WIT
WIT calculation: 49.283 m3 sediment in Segunbagicha Box Culvert
Dredging costs Segunbagicha: amount of sediment x unit prices
Operational “Do” methods and unit prices (2)

12. 5
operational excellence - sustainable services - bilateral cooperation
5
Sediment growth figures
1. Only Agargeon figures are known based on construction year and survey
0,25 meter/year
2. Currently, sediment growth survey: Kallyanpur Canals & Segunbagicha drains
Cross section ID Location Previous done
measured by
Date of previous
measurement
Survey
round 1
Survey
round 2
Survey
round 3
Survey
round 4
Kallyanpur_Main_D-39 Main Canal Globe survey January 2014 Week 45
2014
Week 06
2015
Week 19
2015
Week 32
2015
Kallyanpur_Main_D-13 Main Canal Globe survey January 2014 Week 45
2014
Week 06
2015
Week 19
2015
Week 32
2015
Kallyanpur_Main_UP-13 Main Canal Globe survey January 2014 Week 45
2014
Week 06
2015
Week 19
2015
Week 32
2015
Kallyanpur_Side3_25 Side Canal
3
BIDCON survey July 2014 Week 45
2014
Week 06
2015
Week 19
2015
Week 32
2015
Kallyanpur_Side4_55 Side Canal
4
BIDCON survey July 2014 Week 45
2014
Week 06
2015
Week 19
2015
Week 32
2015
Kallyanpur_Side6_38 Side Canal
6
BIDCON survey July 2014 Week 45
2014
Week 06
2015
Week 19
2015
Week 32
2015
Kallyanpur survey schedule

13. 5
operational excellence - sustainable services - bilateral cooperation
5
Defined dredging units
Drainage unit
(specific characteristics: dimensions,
dredging methods, etc.)
Dredging unit
(project)
Catchment Area
Give examples
…….
…….
…….
Segunbagicha
Segunbagicha upstream box culvert
Segunbagicha box culvert
cluster

14. 5
operational excellence - sustainable services - bilateral cooperation
5
LUDP WIT (1)
• Detail information drainage unit
- Dredging strategy
- Amounts of sediment calculations
- Dredging-, transport- and disposal method
• Unit costs
• Compose/cluster dredging units
• Planning dredging units
• Export planning en key parameters
Drainage unit
Dredging unit
Planning

15. 5
operational excellence - sustainable services - bilateral cooperation
5
LUDP WIT (2)
• Planning dredging units
Drainage unit
Dredging unit
Planning
- Required year of dredging? WIT calculates the year of
intervention with sediment growth figures: signaling
function on maps (e.g. 2018)
(not obligatory to use)
- Use WIT dredging calendar: WIT calculates needed
budgets in annual dredging calendar with unit prices,
sediment growth figures and amounts (m3)
- WIT users are able to slide dredging units in annual
calendar to optimize budgets!

16. 5
operational excellence - sustainable services - bilateral cooperation
5
LUDP WIT (3)
• Planning dredging units
- WIT annual dredging calendar

17. 5
operational excellence - sustainable services - bilateral cooperation
5
WIT demonstration!!
Results:
Amounts and needed budgets if Kallyanpur Main Canal, Agargeon,
Segunbagicha Box culvert and Segunbagicha side drains will be dredged in this year!
Or later……. If the WIT LUDP method is used

18. 5
operational excellence - sustainable services - bilateral cooperation
5
Dhaka data in WIT
- GIS data set with drainage network Dhaka WASA
Provided by Dhaka WASA GIS department
- Hydrographic survey
Globe survey: January 2014, Kallyanpur main Canal
BIDCON survey: August 2014, Kallyanpur side Canals
BIDCON survey: September 2014, Segunbagicha side drains
UDDP survey: December 2013, Segunbagicha Box culvert
Currently: rest of Kallyanpur catchment (closed drains), Segunbagicha Khal, sediment growth survey
- Dredging strategy
Kallyanpur Main Canal: designed dredging profile, Agargeon and Segunbagicha: only all sediment
- Chemical quality sediment
Laboratory results: Kallyanpur = uncontaminated & Segunbagicha = contaminated
- Defined dredging units
Kallyanpur Main Canal (UDDP project),
Agareon (UDDP project),
Segunbagicha Box culvert (UDDP project),
Segunbagicha side drains (surveyed and direct related with UDDP project)

19. 5
operational excellence - sustainable services - bilateral cooperation
5
Remaining WIT necessaires
- Dhaka WASA employees to be trained
WIT users at O&M
WIT maintenance at GIS department
- Annual dredging budgets coming 10 years (requirement)
- Intervention levels (requirement)
This represents the minimum hydraulic capacity of your drainage system.
Intervention levels might be designed in the Drainage Master Plan (?)
- If available, dimensions of closed drains
To compare with measurements of hydrographic surveys (data validation)
- If available, hydrographic survey data from other catchment areas

20. 5
operational excellence - sustainable services - bilateral cooperation
5
Take-home message(s):
Long term Urban Dredging plans gives insights in needed budgets!
How many years is long term?
What is the difference between drainage unit and dredging unit?

21. Questions?

22. Thank you for your attention!