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Water Safety Plan for Kandana Water Treatment Plant

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Water Safety Plan for Kandana Water Treatment Plant
Draft Water Safety Plan
For

Kandana Water Treatment Plant

Step 1:

Catchment and intake

Source:

Surface water: Kalu Ganga

Capacity (Max.): 60,000 m3/day

Kalu Ganga

• Kalu Ganga is the second largest river basin (2719 km2), starting from central hills (2250m) and running across the wet zone.

• Main sources of water of the river are mountainous forests in the central province and the Sinharaja Forest Reserve.

• Largest amount of water (4000 m3) is discharged to the sea at Kalutara after travelling across Sabaragamuva (Ratnapura) and Western (Horana, Mathugama, Kalutara) provinces (129km).

• Upper part of the basin has steep slope and lower part has mild slope.

• Upper part of the catchment is highly affected by intensive cultivation of permanent export crops (Tea, Rubber, etc.) and urban centres.

• Middle part is flowing through well populated urban areas and export crop cultivated areas.

• Lower part is mainly affected by paddy cultivation and also it is affected by flood due to hydrological and topographical characteristics of the basin during southwest monsoon season.

o Extensive clearing of natural vegetation

o Using agrochemical and various chemical manures

o Dumping urban solid waste

o Encroachment of Reservations

o Gem Mines & Washing

o Sand Mining

Treatment

Total capacity of Kandana Treatment Plant is 60,000 m3/day.

• 500,000 populations are serviced and supply areas are Horana, Bandaragama, Panadura, and Moratuwa.

• Water abstraction point is Kandana.

• Conventional treatment process is processed.

Post Chlorination

Transmission

Adjusting pH

Distribution

Consumer

Step 2:

Typical Hazards and Hazardous Events Identification

Catchment

|Hazardous Events |Hazards

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