© Everone Sinks Starco/Flickr


Pioneer in climate change resilience
Already facing flooding, coastal erosion, drought, and landslides, the city of Semarang, Indonesia, is becoming an Asian pioneer in climate change adaptation and resilience. As one of the ten core cities in the Asian Cities Climate Change Resilience Network, Semarang has completed a vulnerability assessment and launched a number of projects, including a flood warning system, rainwater harvesting, and mangrove planting. Semarang has also invested in green procurement, bus rapid transit, and a switch to LEDs for public street lighting.



City Challenge Winner 2014

With the effects of climate change already visible, and in the absence of a substantial international mitigation agreement, many cities have started to highlight adaptation and resilience. The UN global campaign Making Cities Resilient, in a few short years, managed to convince more than 2,000 cities to sign up to systematically reduce urban risks from disasters.

In addition the Asian Cities Climate Change Resilience Network (ACCCRN), a network funded by the Rockefeller Foundation, has been “experimenting with a range of activities that will collectively improve the ability of the cities to withstand, to prepare for, and to recover from the projected impacts of climate change.” The network was founded in 2008 with ten cities in India, Indonesia, Thailand, and Vietnam, and has since been expanded with another 20, including some in Bangladesh and the Philippines. The goal is to find good practices that build climate change resilience for poor and vulnerable people, and to spread the practices to other cities.

Severe environmental pressures

As one of the core cities of ACCCRN, Semarang is the capital and largest city of Central Java, Indonesia, a major port city with 1.5 million inhabitants (5.5 million in metro), with manufacturing and tourism as the primary industries. Semarang is already experiencing severe environmental pressures, including storms, floods, landslides, sinking and inundated lands, coastal erosion, and drought and depleted water supplies – all problems that are exacerbated by climate change. Like Venice and Mexico City, Semarang has been called a sinking city, with scientists estimating land subsidence rates of as much as 10 centimeters or more per year.

Semarang started its work with ACCCRN with capacity building, initiating a dialogue with stakeholders and establishing a city team on climate change adaptation. Next, the city carried out a comprehensive vulnerability assessment and a city resilience study that identified the four top climate hazards of inundation and flooding, coastal erosion, drought and landslides. These are to be combatted via a number of pilot projects: seawall construction, mangrove planting, a stakeholder platform, housing renovation with microcredits, adaptive measures against landslides and drought with warning systems, and plantations.

The vulnerability assessment identified and ranked adaptation actions such as rainwater harvesting, flood shelters, institutional development, liquid waste management, master plan revision, education, water saving, private sector involvement, purification of water sources, slope planting, creating a green belt of plants along shores, river conservation, diversification of marine and fisheries businesses, neighborhood drainage systems, a citywide rainwater channel belt, seawater desalination, and a sea wall.

Rainwater harvesting and flood warning

Almost half of the population is not served by municipal water authorities and are vulnerable to disruptions of clean water, contamination in floods, loss of groundwater, and drought. The city has so far built around 100 rainwater harvesting systems, both on a household and communal scale and some for school buildings. Providing clean water to poorer communities will also reduce groundwater exploitation that speeds up land subsidence. In cooperation with government agencies, experts, and other stakeholders, Semarang has developed a flood early warning system which includes evacuation plans and flood shelters. It reduces climate change vulnerability and disaster risk, and enables the community to prepare measures to reduce damages. The Public Works Agency is now better informed about areas where infrastructure capacity needs to be strengthened in order to minimize the flood impact.

The continuing work on a sea wall with mangrove planting goes back to 2002 and has already reclaimed half of 196 hectares of lost fishponds. The national project of the Jatibarang dam, started in 2014, is expected to reduce flooding, improve the drainage system and deal with the problem of clean water as limited water supply leads to uncontrolled exploitation of groundwater that in turn speeds up subsidence.

Urban resilience pioneer

In 2013, Semarang was one of the first 33 cities worldwide to be selected by the Rockefeller Foundation’s 100 Resilient Cities Centennial Challenge that awards cities who have "demonstrated a dedicated commitment to building their own capacities to prepare for, withstand, and bounce back rapidly from shocks and stresses". Semarang has also launched other sustainability projects, including green procurement, bus rapid transit (BRT), and public lighting replacement.

  • The city has a green procurement policy for all government purchases, with criteria that include energy efficiency and recycled material requirements. The policy also has specific emissions reductions goals for certain types of appliances, such as reducing emissions from air conditioner use by 30%.

  • Semarang currently operates two BRT corridors, with a further six corridors planned for completion by 2020. The system is part of a wider modal shift strategy that also includes wider collection of parking fees and a Car Free Day on Sundays.

  • The city has launched a program to replace 30% of park and street lighting with LED lights. In a previous pilot light replacement project with the private sector, a 33% reduction in emissions from lighting was achieved.


Want to know more about Urban solutions?

Contact Barbara Evaeus
Climate communicator, WWF Sweden

+46 709 111 111


Gunawan Wicaksono, Environmental board Semarang municipality, “Urban Climate Change Resilience in Semarang – Indonesia”, http://www.hls-esc.org/documents/5hlsesc/Semarang.pdf

Asian Cities Climate Change Resilience Network (ACCCRN), Semarang, http://www.acccrn.org/initiatives/indonesia/semarang

Semarang ACCCRN City Team and Mercy Corps, “Semarang Climate Change Resilience Strategy, Indonesia”, http://acccrn.org/sites/default/files/documents/6_Semarang_Resilience_Strategy.pdf

United Nations Population Fund (UNFPA) and The International Institute for Environment and Development (IIED), “Climate vulnerability and adaptation in the Semarang Metropolitan Area: a spatial and demographic analysis”, http://www.droughtmanagement.info/literature/UNFPA_IIED_climate_vulnerability_adaptation_semarang_metropolitan_area_2013.pdf

carbonn Climate Registry, City Climate Report: Semarang, http://citiesclimateregistry.org/index.php?id=313&tx_datareport_pi1%5Buid%5D=583

The Rockefeller Foundation, 100 Resilient Cities, http://www.100resilientcities.org/cities

The Jakarta Post, “Jatibarang Dam to begin operation soon”, May 21 2013, http://www.thejakartapost.com/news/2013/05/21/jatibarang-dam-begin-operation-soon.html

The Jakarta Post, “Semarang joins the ‘sinking cities network’”, October 06 2012, http://www.thejakartapost.com/news/2012/10/06/semarang-joins-sinking-cities-network.html
Comment and ask your questions about Urban solutions

Text by: Martin Jacobson
Last edited: 2017-03-15