Located near the big rivers of Xunjiang and Guijiang, Wuzhou has served for centuries as a gateway city and a regional transportation hub. It connects, particularly by river transportation, the People’s Republic of China’s (PRC) Guangxi province on the border with Viet Nam, with national and international markets. But the rivers also separate this medium-sized city into three parts and, along with the poor mountainous geological and geographic conditions, provide limited flat lands for urban development. Residents thus had to build their houses on marginal lands, gradually expanding upward on major slopes, making them vulnerable to geological disasters such as landslides, slope collapse, and mud and debris flows.
Wuzhou used to address the disaster risks by repeatedly constructing retaining walls and other slope protection structures. But as these traditional erosion control measures proved ineffective and inadequate, the Wuzhou municipal government (WMG) decided to explore alternative solutions. With support from the central government, it accessed a $100 million loan from the Asian Development Bank (ADB) for the Guangxi Wuzhou Urban Development Project. Approved in December 2008, the project was designed to contribute to sustained urban development and improved quality of life in Wuzhou. Its intended outcome was reduced geohazard threats to life and property and reduced geohazard constraints on urban development. It had 3 planned outputs: (i) Pingminchong valley resettlement and geological disaster risk prevention, (ii) Hongling road network and related infrastructure, and (iii) capacity development and institution building.
The project delivered most of its outputs as envisaged. The Zaochong resettlement community was completed in March 2012, a year ahead of schedule. It accommodated evacuated families not only from Pingminchong but also from other adjacent geohazard-prone valleys. The rehabilitation of Pingminchong, completed in September 2015, readied 19.3 hectares (ha) of geohazard-free land for future urban growth. Mountain slopes were cut to make them safe and
free from landslides; the valley was filled and turned into carefully designed terraces; and a drainage system was built to divert storm water and protect the treated terraces from erosion. A 32.5 kilometer (km)-long Hongling road network was built. Wuzhou’s geohazard management capacity was strengthened through the provision of modern forecasting and early warning system equipment and technical support.
The success of Pingminchong resettlement and rehabilitation encouraged the WMG to replicate the model in 3 other adjacent geohazard-prone valleys. This resulted in the relocation of a total of 34,959 people from 7,419 households to safe urban areas; and a total of 631.4 ha geohazard-free land made available for urban development, including those in the WMG-funded replication sites, and the ADB loan-financed Zaochong resettlement community and Hongling urban area. For their part, improved transport and urban infrastructure helped develop Hongling into a thriving geohazard-free urban district.
ADB’s East Asia Department rated the project successful. Planned allocation for the ADB loan was followed. Completion was extended from December 2014 to December 2016, to allow the resolution of some resettlement issues. The WMG was the executing agency, and the Dongtai State Assets Operations Corporation, the implementing agency.