1 Salinisation of the Kapuas Delta Solutions for raw water intake during the dry season - Introduction - Current situation - Long term & Short term Solutions.

1Salinisation of the Kapuas Delta

Solutions for raw water intake during the dry season

- Introduction- Current situation- Long term & Short term Solutions- Criteria

Imput from:Cipta Karya (Province): Pak Angiat BWSK: Pak SapriPak Masryatno (former technical director)PDAM Kota Pontianak

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Introduction: characteristics of the treatment facility in Pontianak

2010 2017- Drinking water demand: 1,068 m3/s 1,769 m3/s - Production capacity 1,21 m3/s 1,51 m3/s- Production capacity in the dry season: 300 l/s 1300 l/s- Costumers coverage: 60% 90%- Population growth: 2,74 %/year 2,74 %/year

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(Technical) Problems during the dry season

- During the extreme events of 1997 and 2002 (resp. 110 and 80 days) the pipe to Penepat (24 km upstream) was only 20-30% of the time operational due to:

- Lack of fuel

- Mechanical failure of the pumps

- Leakage of the transport pipe

- Beside these problems there is a capacity deficit of approx.

900 l/s

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New transport pipe to Penepat- New transport pipe to Penepat (under construction)

Capacity: - Current Pipe (d=600 mm) = 300 l/s (v = 1 m/s)

- New Pipe (d=800) = 500 l/s (v = 1 m/s) - In Holland the transport velocity of 1 m/s is normal)

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A sustainable solution for the future?

6Salinisation of the Kapuas Delta

Short term / Long term

7Salinisation of the Kapuas Delta

Scope of solutionsShort term-Intake further upstream-Optimise capacity WTPs and decrease leakage-Update Penepat intake, including reservoir or extend pipeline to Biyung

Long term-Blocking salt water from the sea-Create fresh water reservoir for the dry period-Flushing KK by constructing canal Sukalanting

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Stop sea water from entering the river system

Construct a dam, must be able toRegulate river dischargePass the ships

It depends on the functional requirements

Location: River mouth (Jungkat) or Ambawang (idea of Prof. Arwin)

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A fresh water reservoir1.26 m3/s = 150,000 m3/day (in combination with Penepat)Dry season = 110 days

Reservoir: 12,000,000 m3

When you fill it up to two meters you need an area of approx. 600 ha.

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Flushing the Kapuas Kecil in the dry season

- Construct a bypass in the river near Sukalanting (not as simple as it looks like)

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Criteria Feasibility