KRUENG MOUNTALA WATER SUPPLY FEASIBILITY STUDY

KRUENG MOUNTALA WATER SUPPLY FEASIBILITY STUDY

NOVEMBER 2006 This publication was produced by Development Alternatives, Inc. for the United States Agency for International Development under Contract No. 497-M-00-05-00005-00

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Photo credit: ESP NAD. The Mountala River (Krueng Mountala) in Aceh Besar district, NAD.

KRUENG MOUNTALA WATER SUPPLY FEASIBILITY STUDY

Title:

Krueng Mountala Water Supply Feasibility Study

Program, activity, or project number:

Environmental Services Program, DAI Project Number: 5300201.

Strategic objective number:

SO No. 2, Higher Quality Basic Human Services Utilized (BHS).

Sponsoring USAID office and contract number:

USAID/Indonesia, 497-M-00-05-00005-00.

Contractor name:

DAI.

Date of publication:

November 2006

TABLE OF CONTENTS LIST OF TABLES ....................................................................................................................... II 1.

KRUENG MOUNTAL WATER SUPPLY SCHEME....................................................... 1

2.

PROJECT BRIEF................................................................................................................. 1

3.

BASE FLOW CAPACITY ................................................................................................. 2

4.

KRUENG MOUNTALA INTAKE AND TRANSMISSION LINE TO KOTA JANTHO 3

5. TRANSMISSION LINE JANTHO – SEULIMEUM –INDRAPURI – LAMBARO (BANDA ACEH)......................................................................................................................... 3 6.

ELEVATIONS AND THEORETICAL PRESSURE HEAD............................................. 4

7. SERVICE AREAS KOTA JANTHO AND SEULIMEUM AND POTENTIAL SERVICE AREAS ......................................................................................................................................... 4 8.

COST ESTIMATE .............................................................................................................. 5

9.

CONCLUSIONS................................................................................................................. 6

10.

FOLLOW-UP.................................................................................................................. 6

LIST OF TABLES TABLE 1 DEMAND FORECAST, POPULATION PROJECTION (FROM ACEH BESAR INFRASTRUCTURE OUTLINE PLAN, ESP, FEBRUARY 2006) ....................................................................................................................2 TABLE 2 ELEVATIONS AND THEORETICAL PRESSURE HEAD ...............................................................................4 TABLE 3 COST ESTIMATE ...................................................................................................................................5

1. KRUENG MOUNTALA WATER SUPPLY SCHEME

2. PROJECT BRIEF In its Infrastructure Outline Concept Plan Aceh Besar, February 2006, ESP suggests that PDAM Tirta Mountala of Aceh Besar may be able to convey drinking water under gravity from Krueng Mountala through Kota Jantho to Seulimeum, Indrapuri and onwards to Banda Aceh, and adjacent peri-urban areas.

KRUENG MOUNTALA WATER SUPPLY FEASIBILITY STUDY

Table 1 Demand Forecast, Population Projection (From Aceh Besar Infrastructure Outline Plan, ESP, February 2006) No

Kecamatan

Projected water demand 2007

2008

2010

2015

2020

Specific consumption in liter per capita and day

120

140

160

180

180

Service area coverage

20%

40%

50%

60%

60%

1108030

Indrapuri

424

1,005

1,479

2,151

2,317

1108031

Kuta Cot Glie

274

649

955

1,389

1,496

1108040

Seulimeum

474

1,120

1,644

2,391

2,576

1108041

Kota Jantho

198

400

490

712

767

Jantho service area

Airport City and Krueng Raya service area Specific consumption in liter per capita and day

120

140

160

180

180

Service area coverage

0%

0%

20%

40%

60%

1108050

Mesjid Raya

0

0

506

1,227

1,982

1108060

Darussalam

0

0

602

1,459

2,358

1108061

Baitussalam

0

0

580

1,405

2,271

in m3 per day

1,370

3,174

6,255

10,734

13,767

in liter per second

16

37

72

124

159

Jantho service area

3. BASE FLOW CAPACITY Initial observations at Krueng Mountala indicate a dry weather base flow at the existing intakes of some 0.200m3/s (see chapter 2.8 below). An extraction of 50% should be environmentally acceptable and technically feasible.

If at a later stage, a larger flow is really required, i.e. when the actual demand exceeds 100 liter per second, a second catchment area can be realized at Krueng Inong, Jantho, at a distance of approximately 5km from the existing intake area (approximate coordinates E 785,960; N 580,810).

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KRUENG MOUNTALA WATER SUPPLY FEASIBILITY STUDY

4. KRUENG MOUNTALA INTAKE AND TRANSMISSION LINE TO KOTA JANTHO PDAM operates two intakes at Krueng Mountala, both approximately at an elevation of 270m above sea level, and approximate coordinates E 781,920; N 583,390. The intakes are in a ‘Protected Forest Area’. From there water is conveyed to a small service area in Kota Jantho. The total length of the transmission line is approximately 7km. The existing installations including the intakes, transmission pipes, a pressure breaking intermediate reservoir, a sand trap and the distribution network in Kota Jantho are in poor state of repair but remain operational.

THW refurbished one intake and the subsequent transmission pipes in August 06. The agency also plans to extend the supply network in Kota Jantho to a housing scheme for tsunami victims (financed by CARE). THW has some water quality analysis but only episodic information on the seasonal discharge pattern in Krueng Mountala. PDAM maintains no data on flow and water quality in Krueng Mountala.

5. TRANSMISSION LINE JANTHO – SEULIMEUM –INDRAPURI – LAMBARO (BANDA ACEH) Between Jantho and Seulimeum the proposed transmission line would most likely follow the access road to Kota Jantho. The approximate distance is 11km.

From the Seulimeum intersection towards Banda Aceh there are three possible public right of ways, the Banda Aceh to Sigli Road, an irrigation channel, and an old train track (abandoned). The total length of this section is 32km.

At Lambaro several options for further inter-connection (with sufficient pressure head) exist, namely: 1. connection to the supply network of PDAM Tirta Daroy of Kota Banda Aceh at Lambaro WTP (2km further); 2. connection to the supply network of PDAM Aceh Besar at Siron 2 WTP (3km further).

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KRUENG MOUNTALA WATER SUPPLY FEASIBILITY STUDY

6. ELEVATIONS AND THEORETICAL PRESSURE HEAD Table 2 Elevations and Theoretical Pressure Head Approx elevation of service area in m asl

Cumulative distance from intake in km

Cumulative head loss in m

Theoretically remaining pressure headin m

Intake

270

-

-

0

Kota Jantho

120

7

21

228

Seulimeum

60

18

54

156

Indrapuri

20

36

108

142

Lambaro / Banda Aceh

10

50

150

110

7. SERVICE AREAS KOTA JANTHO AND SEULIMEUM AND POTENTIAL SERVICE AREAS PDAM does not maintain consistent records of the existing supply network in Kota Jantho.

THW is of the opinion that most of the secondary pipelines will need replacement in the medium term and that more supply robustness has to be added by new looped supply mains.

In Seulimeum PDAM owns a small independent water supply scheme covering the town’s centre, mainly the market area. The scheme with a design capacity of 10l/s includes an intake at Krueng Buga (one submersible pump), a small package treatment plant, a reservoir, and a distribution network. All parts of this scheme have been out of operation for several years and may now be beyond repair.

The town of Indrapuri has never been served by PDAM. The UNICEF funded pipeline project from Siron 2 WTP to 22 temporary living centres (TLC) is a first step of PDAM to expand its service area in the sub-districts of Baitussalam, Darussalam, and eventually Mesjid Raya. Even though this project mostly caters for the demands of existing TLC and transitional shelter schemes, it will eventually stimulate PDAM to expand its service area. In addition, PDAM may soon find a rapidly expanding market for water provision in this area, due to housing projects of BRR and several international agencies, the provincial plan to establish an ‘airport city’ including a light industry zone, and foreseen demands of the Malahayati Port and adjacent settlements.

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KRUENG MOUNTALA WATER SUPPLY FEASIBILITY STUDY

8. COST ESTIMATE Price basis for a preliminary cost estimate are tenders and implemented projects of THW in Banda Aceh, Aceh Besar and on Simeulue during 2006. Assumptions are: 1. Transmission lines HDPE 2 * OD355 in parallel, pipe trench, supply and installation, including fittings, special structures (pipe bridges, etc) USD 195.-/m 2. Storage reservoirs at high points, storage volume 50% of daily consumption, construction in reinforced concrete at elevated locations USD 150.-/m3 3. Secondary and tertiary network HDPE OD75 to OD160 in pipe trench, supply and installation, including fittings, special structures (valve boxes, flush outs, etc) USD 23.-/m 4. Service connections 10m length, with close off valves and water meter USD 50.-/unit Table 3 Cost Estimate Item

Units

Quantity

Costs in USD

Intake, pre-treatment plant

lump sum

1

2,000,000.-

Transmission line

m

50,000

9,750,000.-

Banda Aceh service area

3

Reservoirs

m

3,600

504,000.-

Supply network

m

510,000

11,730,000.-

Service connections

no

10,200

510,000.-

Sub-total

24,494,000.-

Airport City and Krueng Raya service area Transmission line

m

30,000

5,850,000.-

Reservoirs

m3

3,300

462,000.-

Supply network

m

470,000

10,810,000.-

Service connections

no

9,400

470,000.-

Sub-total

17,592,000.-

Total investment costs until 2020

42’086’000.-

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KRUENG MOUNTALA WATER SUPPLY FEASIBILITY STUDY

9. CONCLUSIONS 1. The concept to supply drinking water from Krueng Mountala to Seulimeum and onwards to Banda Aceh is technical feasible.

2. Costs for Intake, pre-treatment, transmission lines and reservoirs are estimated at US$ 18,566,000 and the costs of Supply network and service connections amount to US$ 23,520,000.

3. The proposed scheme would solve the current problems with water treatment in Banda Aceh (high turbidity of raw water, risk of up-stream contamination incidents, high costs for Operation & Maintenance).

4. The gravity fed system would require comparably lower operation and maintenance inputs (Electricity and chemicals).

5. The estimated investment costs of some US$ 13 million for intake, pre-treatment and transmission line for the Banda Aceh area are in the same order of re-investments in the Lambaro WTP of Kota Banda Aceh, due in 10 years time.

10. FOLLOW-UP 1. Furthering this concept could include: • At the water source • Collection and analysis water quality samples over a period of time, including analysis of trace metals, pesticides, major cations and anions, and nutrients - PO4-P, nitrateN, nitrite-N, and ammonium; • Monitoring of water flow over a period of time, of particular interest will be the dry season base flow; • Proposal for source protection; • Evaluation of appropriate treatment process for raw water.

2. With respect to the transmission line • Field verification of technical feasible alignments, in particular old railway alignment and irrigation channel.

3. Concerning the service areas • Inspection of all existing facilities in Kota Jantho and Seulimeum with PDAM operators; • Mapping and analysis of existing networks in Kota Jantho and Seulimeum with the help of knowledgeable PDAM operators, e.g. using EPANET; • Compilation of information on ongoing and planned housing schemes in the area, the ‘airport city’ and the port-area development, realistic and robust demand forecasts; • Study of technical feasible service area as well as build-up over time using high resolution aerial imagery. The imagery can be obtained from the GTZ / SLGSR GIScentre in Jantho. Contact person at the GIS centre is Jochen Kranik at jochenkranik@yahoo.com.

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ENVIRONMENTAL SERVICES PROGRAM Ratu Plaza Building, 17th. Fl. Jl. Jend. Sudirman No. 9 Jakarta 10270 Indonesia Tel. +62-21-720-9594 Fax. +62-21-720-4546 www.esp.or.id