The document outlines the aim and content of a module on water supply and sanitation. The module aims to enable students to (a) identify sources of water in Sri Lanka and describe infrastructure required, (b) compare characteristics of raw waters and water quality tests, and (c) understand current water treatment and maintenance methods. The module covers topics like water sources and quality, collection and distribution systems, treatment methods, and sewage collection and treatment. Students will learn to identify water and sanitation infrastructure needs and maintain related systems.

1. National Diploma for Industrial Technician
Civil Engineering
Module : Water Supply and Sanitation
Module No : C 1-5
Module Value : 01
60 Hours ( 2 Hours per Week)
Rational :
Assessment Method : AE
Aim of the module : To enable the students to,
(a) Identifies the main sources of water in Sri Lanka for Public supply
and describes the headwork required in each case.
(b) Compares and explains the characteristics of raw waters from all
sources and lists the physical and bacteriological tests used to
determine the quality of raw and tested water.
(c) Know current methods of water treatment operation and
maintenance of water supply and relates their necessity to the
quality of raw waters.
(d) Describe the types of reservoirs and ancillary equipment required.
Describe the distribution system including operation, maintenance.
(e) Determine capacity requirements of a water supply, drainage &
sewerage
(f ) Understand the major types of sewer systems, current methods of
sewage treatment ,the operation and maintenance of sewerage
systems
SPECIAL NOTES :
(a) To enhance the various processes introduced in class room site
visits should be used whenever possible.
WATER SUPPLY AND SANITATION Unit No: C 1-5
C

2. (b) The suggested assessment method consists of 2 assignments
and an end test of 2 or 3 hour duration.
( c) For final assessment 50% of the marks of previous 2 assignments
.should be. counted together with 50% of the marks of end test .
(d) Suggested time allocations for Sections :-
A - 20 hrs
B - 20 hrs
C - 20 hrs
A.
01. Develop the awareness of the scope of water supply & sanitation
1.1 Identify the duties of the water works engineer & sanitary
Engineer.
1.2 Describe the water borne diseases.
02. Develop an understanding of the quantity of water and the systems of water
supply.
2.1 State the water demands such as domestic, industrial, public and fire
2.2 Estimate the water quantity.
2.3 Forecasting of average per capita water consumption and peak domestic water
demand, forecasting of , public, industrial, commercial and agricultural water
demand, other basic design data required, service level
2.4 Explain the factors affecting consumption rate.
03. Develop an understanding of the characteristics of available water sources.
3.1 Explain hydrologic cycle.
3.2 State the characteristics of Surface Water & ground water and , their
characteristics, rain water harvesting
3.3 Classify the sources of water.
3.4 select the water sources.
04. Develop an understanding of the various forms of ground water.
4.1 State in construction of dug wells, bored well, drilled well and their locations.
4.2 State the methods of measuring the yield and do the sums.
4.3 State the protection of a well from contamination.
05. Develop an understanding of the types of surface water sources.
5.1 State the catchments area and the site of a reservoir.
5.2 Explain the impounded reservoir, yield, and its capacity and control.

3. B.
06. Develop an understanding of the methods of collection and distribution or water
through intakes.
6.1 Identify the locations of distribution reservoirs and intakes.
6.2 describe the types of distribution reservoirs and storage capacity
6.3 Describe the types of intakes such as, river, reservoir pipe, intake well
6.4 Identify the systems or distribution or water (different types of transmission
devices and their effects including strength considerations).
6.5 Sketch and describe storage tank details, Types, layout & design of distribution
systems, sizing of pipes, use of Hazen William formula, pipe material and jointing
and types of valves and water meters, their uses and maintenance
.
07. Develop an understanding of the various types of pump and Pumping station.
7.1 Identify the types of pumps & pumping stations
7.2 Compare the main types of pumps (displacement, centrifugal, airlift, hydraulic
etc.).
7.3 Select an appropriate pump with respect to location, capacity, power
requirements.
08. Develop an understanding of the qualities of water supply.
8.1 List The Impurities Or Water.
8.2 Describe examination of water, such as; Physical, chemical and bacteriological
tests of water and important laboratory procedures.
8.3 State the standards of drinking water.
09. Develop an understanding of various treatments of water.
9.1 State the common treatments and their achievements.
9.2 Identify the location of a treatment plant.
9.3 Sketch a layout of a typical treatment plant and describe its functions.
10. Develop an understanding of sedimentation filtration and disinfection.
10.1 Sketch and describe the fill and draw type and continuous type sedimentation
tanks.
10.2 List the common coagulants and state their properties
10.3 Sketch and describe in common types of filters.

4. 10.4 Describe the Qualities & methods of disinfection.
10.5 Identify the importance of other treatments of water such as softening, aeration
activated carbon.
C- Sanitary Engineering.
11. Develop an understanding types of waste water ) and their characteristics,
measurement of strength of waste water , hazardous waste and sewerage systems
11.1 Define sewage, sewer, refuse, garbage, rubbish, invert, Sewerage system,
silage.
11.2 Identify the systems (separate and combined etc.), design of sewerage systems,
sewer sections, sewer materials and specific properties
11.3 Compare the sanitation systems.
12. Develop an awareness of sewer pipes sewer appurtenance
12.1 Differentiate the sewer pipes made out of various materials Such as bricks,
stoneware, cement concrete, cast-iron, asbestoses, plastic.
12.2 Differentiate the efficiency of the various to cross sections.
12.3 Identify the sewer appurtenances such as manhole; street inlets, grease and oil
traps. Automatic flushing tanks inverted siphons.
13. Develop an understanding of physical & chemical characteristics of sewage.
Explain the physical characteristics such as...
13.1 Odour, colour, temperature, & solids of sewage.
13.2 Explain the chemical characteristics such as composition of sewage, aerobic and
anaerobic decompositions, ammonia Organic nitrogen, albuminoidal nitrogen,
nitrites & nitrides, chlorides, hydrogen sulphide, dissolved oxygen, B.O.D,C.O.D
relative stability & bacterial life.
14. Develop an understanding of disposal of sewage and sewage treatment.
14.1 Explain, land disposal and advantages and disadvantages .
14.2 Classify the sewage treatment.
14.3 Explain The Functions of A Typical Treatment System.
15. Develop an understanding of waste and its transmission-
15.1 Explain the types of pumps
15.2 Explain how to maintain capacity of sewerage systems
15.3 Associated problems and hazards related.
15.4 Explain the safety equipment.
Learning Outcomes

5. The student will be able to,
 Identify the requirements for water supply, drainage & sewerage
 Knowledge about the construction of water supply drainage & sewerage systems and
maintain water supply drainage & sewerage systems and related appurtenances