wsp-training-pack-mod2.pptwater training

water supply system management

1. 1

2. Module 2 Describe the water supply system
Session structure
•Overview
•System components and description
•Outputs
•Challenges
•Factors to consider
•Exercise
2

3. Module 2 Describe the water supply system
Overview
• First task of WSP team
• Aim: To enable risks to be assessed and managed
•Involves field investigations and local knowledge
•Each system assessed on its own
•Involves documentation, review and update
3

4. Module 2 Describe the water supply system
System components
Catchment
Treatment
Distribution
User
Filtration
Coagulation
Clarification
Disinfection
Water supply and quality
Land use
Abstraction method and location
Networks
Service reservoirs
Tankers
General public
Potable
4

5. Module 2 Describe the water supply system
Description also involves
• Knowing water quality standards
• Assessing the likely changes to source water quality following
changes in weather
• Describing any interconnectivity of source waters (e.g. 2 wells, 1
aquifer)
• Gathering information relating to water storage
• Identifying the operational & managerial staff involved
• Familiarization with existing documents relating to the supply
• Etc.
5

6. pH
Turbidity
UV254
pH
pH
Turbidity
UV254
pH
Turbidity
UV254
pH
Coagulant
& pH
adjustment
RAPID MIX FLOCCULATOR CLARIFICATION FILTRATION
Tropical
forest
River
catchment
1
Run-off
Raw water
transfer
Users
City 1
Water
treatment
Abstraction
from river
Distribution
system
Private
connectio
n
Supply flow diagram
Refer to C1 description
Water
treatment
Output 1
6

7. Module 2 Describe the water supply system
Output 2 – understanding of current water quality
Regulatory limit
Nitrate concentration leaving works
7

8. Module 2 Describe the water supply system
Outputs 3 Identification of users and uses
Intended use Intended users
The water supplied is intended for
general consumption by ingestion.
The water supplied is also for bathing
and laundry. (Note that these
activities can also result in dermal
exposure and inhalation – through
showering – of waterborne hazards.)
Foodstuffs may be prepared from the
water.
The organization provides water to the
general population.
The intended consumers do not
include those that are significantly
immunocompromised or industries
with special water quality needs.
These groups are advised to provide
additional point-of-use treatment.
8

9. Module 2 Describe the water supply system
Challenges
• Out of date or no maps
• Unknown catchment land use
• Little stakeholder interaction / unknown stakeholders
• Unknown risks
• Limited staff time / resources available
• Out-of-date documentation
9

10. Module 2 Describe the water supply system
Factors to consider
Options = photographs,
symbols, drawings
Use flow direction arrows
Cross-reference to other
documents
e.g. maps, treatment flow diagrams
Continually update
10

11. Module 2 Describe the water supply system
Exercise – create a system flow diagram
• In small groups
•Use symbols to describe a supply system known to you
•Describe from catchment to user
•Add star where information is not known
•Add banner to cross-reference to other documentation
•List the most important items to consider
•Plan how to obtain unknown information
• 25 minutes
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