Mapping and Economic Impact Analysis of Flood on Rice Field in Upper Citarum Watershed, Indonesia (PAP014961)

Código

PAP014961

Autores

Adang Hamdani, Budi Kartiwa

Tema

Land use and Floods, landslides and erosion

Resumo

Flooding events in the Citarum basin not only hit the local settlements, but alsodamaging rice crops and other infrastructures located in the national rice production centers in thenorth coast of West Java. Therefore, these losses then affect the national rice production whichdestabilize food security. The purposes of this study are to analyzing the characteristics of riverflow and flood discharge of Upper Citarum, preparing inundation maps of Upper Citarum in thescale of 1:100,000 with return flood period scenario of 2, 25 and 100 years, and analyzing thepotential for rice crop losses caused by the flood and inundation in the upper Citarum river basin,West Java. Flood return period was calculated based on the Gumbel frequency. Flood andinundation was modeled using HECRAS which was developed by the U.S. Army Corp ofEngineers (2002). While the rice crops losses by the flood and inundation was estimated usingRENDAMAN.CSM model. Potential loss of rice due to floods in the paddy fields on a two-yearreturn period reached 8.4 billion rupiah (USD $ 700,00) , this amount will be tripled in the 25 yearsflood return period and becomes 6.4 times in the 100-year return period. Paddy spikes loss ratio ofthe period of 25 years to 100 years is higher than 2-year period to 25 years. This is because floodproneareas in the 100-year return period not just located in the same area of 25-year flood returnperiod but also includes the wetland area with water levels in between 55 to 110 cm. Losses in thisarea is higher compared to the losses of 25-years flood return periods.