Banger Pilot Polder Semarang

Technical and institutional implementation of a polder system

Posted on 2 May 2014


Indonesia faces daily flooding events, caused by both heavy rain-fall and by the sea and its tidal influence. A way to overcome the floods in the city is to implement a polder system. The city of Semarang was chosen for a the establishment of a pilot polder, mainly because of the governmental feasibility. The Indonesian government and the authorities in Jakarta province, which faces similar water problems, are following developments in the polder project with great interest.

The Netherlands have water boards that take care of water management. Indonesia does not have anything similar on a comparable scale. So a water board was established to manage the pilot polder. The new water board consists of eight people, including three local residents, three professors, and two people representing the authorities.

The institutional part of the project was managed by the Water Board Schieland and the Krimpenerwaard and financed by VNG international and the NWB-Waterfund. The technical design of this transformation was done by Witteveen + Bos and financed by Partners For Water.


1. The institutional strengthening of local water management in the city of Semarang by establishing a Water Board Organization, a Polder Authority that is set up by people’s participation and (partly) financed by the people themselves.

2. To show and teach the local communities by means of a pilot project how to manage water levels and to conquer flooding by applying and maintaining the principles of a polder system.



Pumping station and dam in Kali Banger

Fishing ponds as retention basins

Dredging and deepen of Kali Banger

Construction of Nothern dike (sea side)

Improvement Eastern dike (B.K. Timor)

Water inlet (B.K. Timor)

Construction of several weirs

Project location

Project partners

  • Aqua for All
  • Dutch Water Authorities | Unie van Waterschappen
  • Partners voor Water
  • Witteveen+Bos