Item

Description

1. Name of Project

Okak  Irrigation Sub-Project

2. Location

(1)        General Layout is shown in Figure A-1.

(2)        Project Location and Administration

·          Province         : Riau

·          District           : Rokan Hulu

·          Sub-district     : Rambah Samo

        164 km from city of Pekanbaru

3. Objective

(1)       To enhance rice production through water resources development

(2)       To increase the income of inhabitants in and around the project area

(3)       To raise the farmers living standard

(4)       To increase employment opportunity in the area

(5)       To contribute to the development of the rural socio-economic conditions

4. Type of Development

New development:

(1)       Construction of 2 weirs and head works.

(2)       Construction of main irrigation system and tertiary systems

5. Irrigation Development Area

(1)       Whole project area                 :    1,000 ha

(2)       Target area under PTSL-II      :    1,000 ha

6. Water Supply and Water Requirement

(1)     Water source: Dua River and Limau River

(2)     Available water supply: as shown in Table A-1

(3)     Irrigation water requirement: as shown in table A-2

(4)     Diversion water requirement: 1.72 l/sec/ha

Item

Description

1. Necessity of the project

Entering the 1990s the self-sufficiency of rice in Indonesia is facing a crisis.  Rice production is quite abnormal and irregular compared with the 1980s.  The average unit yield of rice stands stationary in the 1990s.  The expansion of irrigation area lost momentum in the 1990s, and the rice import resumed from 1994.  Under such situation, the Government has adopted a policy of food security and sustenance of self-sufficiency in rice production.

The crop intensity of paddy fields in Indonesia is as low as 119% that indicates a possibility to expand the harvested area and thereby to increase the rice production through the irrigation development.  In 1999, there was about 2.1 million ha of rain-fed paddy fields and 1.17 million ha of upland paddy fields in Indonesia, for which the irrigated agriculture can be efficiently introduced without major problems such as transmigration, large-scale land development, social infrastructures, etc.

In order to promote the food security and sustenance of self-sufficiency in rice production, the Government is keen to implement the irrigation development being effective for rice production, quick yielding and cost effective

The primary objective of PTSL-II is to enhance rice production through water resources development such as irrigation projects or pond/dam projects, contributing to the self-sufficiency of rice in Indonesia.

2. Beneficiary Area

The socio-economic condition of the people in the project area is at the subsistence level due to the limited income from agricultural activities.  The basic development constraint is the lack of irrigation water.  The present condition is as shown below.

·            Cropping Pattern    : Paddy/polowijo-paddy

·            Cropping intensity : 56%

·            Unit Yield (ton/ha) : 2.75 t/ha of paddy

·            Cultivated area       : 482 ha

The irrigation benefit of the project is primarily derived from the increased crop production attributable to a stable irrigation water supply and an optimum input.

The construction of weirs, irrigation systems and drainage facilities including tertiary system will be carry out under PTSL-II. 

With the project implementation, the principal benefit of the project is as follows:

·            Increase of cropping intensity from 56% to 200%

·            Increase of unit yield of crop by changing from rainfed agricultural land to irrigated land

1. Water resources

The irrigation water for Okak sub-project is taken from the Dua River and from the Limau River having a total catchment area of 92.4 km² at the proposed two weirs sites..

The average, the maximum, and the minimum (10 days basis) discharge of the two rivers are estimated to be 2.84 m³/sec, 10.81 m³/sec, and 0.44 m³/sec, respectively.

The river discharge is sufficient for the whole Okak Irrigation area of 1,000 ha with a cropping pattern of paddy (100%) in the rainy season and paddy (50%) and polowijo (50%) in the dry season (total annual cropping intensity of 200%).  

2. Land use

The present land use in the area:

Irrigated paddy field                :  -  ha

Rain-fed paddy field                :  482 ha

Rubber plantation                    : 305 ha

Bush and grassland                  : 213 ha

The rubber plantations are owned by local farmers. The farmers are keen in the conversion of rubber plantation of 305 ha into paddy field. 

3. Institutional set-up

There is no water users association in the sub-project area because no irrigation water supply is made so far. 

4. Environmental issues

·       Type of development is new therefore countermeasures for land acquisition are needed for construction of the weirs, main canal, and secondary canals. 

·        The area in which the development works are to be carried out is already used for agriculture in the form of rain-fed paddy field, rubber plantation or grassland. Therefore the existing flora and fauna have been well adapted to the existing agricultural system.

·         Based on strong requests from local farmers for preventing public facilities from being inundated, the weir crest is lowered. In order to minimize the inundation area in the upstream of the weir, the weir crest needs to be lowered therefore the weir crest shall be 4.0 m lower than the original crest.

·          There is no major negative environmental impact because there will be no major change in the appearance of landscape, no disturbance on natural habitats, and no loss on historical, cultural and religious sites. 

Item

Scope of Work

1.

Construction of weirs and head works

2 nos.

2.

Main Irrigation Canal System

(1) Construction  of main irrigation canal

8.3 km

(2) Construction  of secondary irrigation canal

      Karya Mukti secondary canal

7.3 km

      Karya Mulya secondary canal

      Pasir Makmur I secondary canal

      Pasir Makmur II secondary canal

5.6 km

1.2 km

1.6 km

(3) Construction of irrigation canal related structures

      Measuring structure

   2 nos.

      Division structure

2 nos.

      Off-take structure

17 nos.

      Check structure

 11 nos.

      End-check and waste way

 2 nos.

      Side spillway

                          3 nos.

      Irrigation culvert

26 nos.

      Drain chute

8 nos.

      Drainage culvert

35 nos.

      Aqueduct

1 nos.

      Foot bridge

7 nos.

      Outlet

1 nos.

3.

On-farm System

(1) Tertiary system

290 ha

(2) Land Development including tertiary system

710 ha

Item

Description

1. Executing Agency

Directorate General of Water Resources, Ministry of Settlement and Regional Infrastructure

2. Implementation Management

Implementation of Okak Irrigation Sub-project is managed by the sub-project manager of Okak Irrigation Sub-project.

3. Monitoring and Management

·            At the sub-project level, the sub-project manager will monitor and control physical and financial progress of the project work under the guidance of the Riau Irrigation and Swamp Project Manager and the Chief of Provincial Water Resources Services.

·            At the central level, Directorate of Water Resources in Western Region (DWRW) is responsible for monitoring the progress of the project.  DWRW will report the progress to Directorate of Technical Guidance (DTG).

·            DTG will compile the information together with other sub-projects information to prepare the progress report to JBIC. 

The organization and management structure of the project implementation is as per attached in Figure G-1. 

4. Payment Procedure and Monitoring of Financial Progress

·            Direct payment is applied to the civil work contractors. 

·            Any payment will be processed with the confirmation of the contents of invoices by the PTSL-II consultant.

The flow chart of payment and monitoring procedure for financial progress is as per attached in Figure G-2.