Workshop and Training on Water and Urban Initiative Case study in Jakarta, Indonesia

Asia Pacific Center for Ecohydrlogy (APCE) in collaboration with United Nations University (UNU) held Workshop on Water and Urban Initiative: Case Study in Jakarta on August 21-24 in Grand Kemang Hotel, Jakarta. The first day of the Workshop, stakeholders came from Provincial Government of DKI Jakarta, Ministry of Environment and Forestry, and mostly researchers from many different organizations. This workshop was officialy opened by Dr. Zainal Arifin, Deputy for Earth Science of LIPI/Indonesia Institute of Sciences. Speech also delivered by Dr. Oswar Muadzin Mungkasa, Deputy Governor for Spatial Planning and Environment of DKI Jakarta. Along with him, Dr. Ignasius Dwi Atmana Sutapa, the Executive Director of APCE also delivered his titled “Ecohydrology Approach for Water Quality Improvement”.

On the second day, the event continued with a workshop “ Hands-on Training Workshop of Water Quality Projection Model for Jakarta, Indonesia. This workshop was delivered by experts from many countries, such as Nepal, Japan, and India. The next day, the event titled “Hands-on Training  Workshop of Flood Inundation Modeling and Damage Assessment”. This event was attended by various researchers (Institut Pertanian Bogor/IPB, Institut Teknologi Bandung), government agencies (BMKG/Geophysics National Agency), Research Center for Limnology LIPI, Research Center for Geotechnology LIPI, LAPAN/Aerospace National Agency), non-government organization, and policymakers, such as local government and Central Government Agencies. The Training begins with the opening of the executive director of APCE, Dr. Ignatius, said that in sustainable water management also requires a change of social and cultural aspects. There must be a change in people's habits to become a new sustainable culture. Considering the principles of hydrology, ecology, ecotechnology and culture, a modeling system and ecohydrological measurements were developed to estimate the risk of disasters so as to reduce risks and improve the water environment.

The hands-on training method concerning Ciliwung River Basin was delivered by Mishra and Kefi from UNU. The study presents that Jakarta floods occur due to changes in land use, climate change, low river water capacity, land subsidence and sedimentation. The projection of land use change (2030) was carried out to obtained the information of hydrological and flood response in the future. When the projected land use of 2030 were simulated into  the model, the peak discharge results show an increase up to 20% from 2007. Whereas when the effects of land use change and climate change combined into the model, resulting a peak flow of 130% (2030). Using a hydrological model capable of calculating and displaying the depth of flood, the loss value can be calculated with the depth-damage curve. Which is a graph of the relationship between the estimated losses at the depth of a particular inundation.

The FLO-2D practice was aimed to model the extent and depth inundation of the Jakarta floods. So in the future we  can reduce, anticipate, and even mitigate disasters and losses due to Jakarta floods. By using FLO-2D model, the participant will be able to project future flood inundation conditions in Jakarta. FLO-2D model is used as a hydrological-hydraulic model, with DEM data input, River basin, river network and rainfall. Grid size of DEM depend on the user necessary and the area of river basin. The smaller the grid size, the longer the model is processing. In the model we can choose inlet (based on the highest elevation) and outlet of the river basin (based on the smallest elevation). The elevation value can be changed manually based on the land use type.  After all the parameter inputted, we can run the model resulting water elevation and contour in visualization. The water level also can be visualize in ArcGIS software.