No abstract

The availability of water in the reservoirs in the Central Citarum sub-watershed must be sustainable because it is the mainstay of irrigation water, electricity, and drinking water in parts of West Java and DKI Jakarta. This study aims to determine the effect of land cover change on hydrological parameters by simulating the SWAT (Soil and Water Assessment Tool) model. The research area covering an area of 273,240.85 ha, based on observations of Spot imagery in 2019, has a forest cover of 20.16%. The surface runoff calculation shows that the Flow Regime Coefficient (KRA) is very high (128). Based on the simulation with SWAT, the KRA value will be better (79) if the 2019 RTRW is fulfilled. The results of several land cover scenarios show that an increase in the forest area of 10 – 12% will increase infiltration by about 8-9% and reduce surface runoff by about 8%, and groundwater recharge will be better. The flow of the Citarum river fluctuates and fills the Jatiluhur Cirata Reservoir with an average of 800,081,212.0 m3/year. One way to improve the hydrological function is to convert some dryland agriculture, streamlining urban forest plants to obtain a forest area of 37%.

Inter-urban transportation railway becomes the chosen mass transportation mode by the people for daily commuting. The tariff is relatively cheaper and affordable. The travel times are shorter as compared to other modes of transportation. This study aimed to understand the development surrounding Jakarta – Bogor Inter-urban transportation railway station - Cilebut Station located in Sukaraja District. Correlation between passengers and population is 0.99 that shows great impacts to development area surrounding it. Analysis of development aspects are land use, population, and economic change. Using Geographic Information System analysis from the year 2010 to 2015, residential area increased by 18.11% and plantation area decreased by 32.9%. Population was analyzed using average rate of growth from the year 2011 to 2015, the result is 4.6%. Population density increased from 3809 people/sq.km to 4694 people/sq.km. Facilities of industry and grocery store increased, likewise labor structure of business and hotel increased by 11350 persons and services by 3460 persons. But agriculture labor decreased by 894 persons. Based on this research, local government should be alerted. In the case a region has a railway station and is stopped-by inter-urban transportation trains, the area development will take place rapidly, intervention needs to be done.