Indonesia – Integrated Water Resources and Flood Management Project for Semarang


Region: Asia - Southeast Asia
Country: Indonesia
Location within Country: Semarang City, Central Java Province
Date: November 2007 - January 2016
Client: PKII was a sub-consultant of Nippon Koei for the Directorate General of Water Resources Ministry of Public Works
Funding Source: Japanese Yen Loan
Category: Flood Control & Drainage
Services: Study, Design, Detailed Engineering Design, Technical Assistance, Master Planning

Constructions Overview

Narrative Description of Project:

Indonesia has a tropical monsoonal climate with distinct wet and dry seasons, and about 80% of its rainfall is concentrated in the wet season.  Semarang, where the project is located, has suffered from flood damage for many years as a result of its climate and topography, and flood countermeasures are an urgent matter.  Moreover, water shortage has become a problem, particularly in the dry season, as a result of the population growth that is accompanying the industrialization and urbanization of Semarang, leading to severe land subsidence caused by excessive abstraction of underground water due to the lack of surface water.  An integrated water resources management strategy is therefore required.

Objective of the Project

– To mitigate fold and inundation damages along the West Floodway / Garang River, to develop water resources for the municipal use in Semarang city and to reduce the inundation damages in the northern central area ofSemarang City;
– To improve the environmental conditions along the river and the urban area; and,
– To upgrade the living conditions of inhabitant in the project area

Description of Actual Services Provided in the Assignment:

Scope of Work
Component A: West Floodway/Garang River Improvement

Project Works River Stretch/Location
1. West Floodway Improvement
– Dredging downstream channel
– Excavation of existing flood plain
– Raising/reinforcing existing flood wall
– Embankment of dike at the river mouth
2. Garang River Improvement
– Riverbed excavation
– Excavation of existing high-water channel bed
3. Rehabilitation of the SimonganWeir
– Fixed Weir
– Sediment flushing gate and Intake structure
5.3 km upstream from the river mouth

Component B: Construction of Jatibarang Multipurpose Dam
The design of the main structures of  the dam is summarized as follows:
– Function of Jatibarang Multipurpose Dam
– Dam Type
– Proposed Dam Facilities

Description of Actual Services Provided in the Assignment:

1. Assist in the preparation of completion report for the project.
2. Assist in finalizing the As-Built Drawings.
3. Assist in finalizing the Technical Notes.



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