Drought is one of the main natural disasters that have affected agriculture and rice production in Cambodia. The main objective of this study is to assess the drought in the Cambodia Mekong Delta using different drought indices (Standardized Precipitation Index (SPI), Percent Normal Index (PNI) and Decile Index (DI). The results showed that Index (PCI) values ranged from 14.79 to 16.69, meaning that the rainfall pattern of the study area is seaso

The study aimed to analyze rainfall trend in Tonle Sap Lake regions of the Lower Mekong Basin and to determine if these time series belonged to a similar regime, have had any significant trends. To reveal the behaviors of annual and monthly rainfall for trends, historical data series of available 6 stations in more than 30 years from the 1980s to 2012 were used in this study. From the basic daily rainfall data, total and means of monthly and annua

People are faced with shortages of freshwater for consumption and irrigation during the dry season and the early part of the wet season1 as well as during the dry spell within the wet season. This paper assesses rice water use in Chrey Bak river catchment located in the Rolea B’ier district, Kompong Chhnang province - Cambodia using CROPWAT model. The study of rice crop water requirement is important not only for irrigation system design, irrigat

The main objective of this study is to assess the SWAT performance for simulating daily water discharge and sediment transport from a catchment of Tonle Sap Lake Basin. The model was calibrated from June 2010 to November 2013 for flow and from June 2011 to November 2013 for sediment. The result showed that the flow simulation was better than that of sediment transport. The model calibration was better during the first hydrological year but lower

Effects of aluminium sulfate and Klaraid on physico-chemical characteristics of wastewater and total phosphorous removal during wastewater treatment process at a local beverage company in Phnom Penh were investigated followed by the determination of the optimum application of aluminium sulfate and Klaraid for phosphorous flocculation. Aluminium sulfate versus total phosphorous at different ratios of 20:1, 21:1, 22:1, 23:1, and 24:1 were studied w

Chrey Bak River catchment is recognized by the Royal Government of Cambodia (RGC) as an important area for agricultural investment and development. As a consequence, the catchment has experienced intensive land use and land cover changes. The objectives of this paper are to investigate the land use change in Chrey Bak River catchment during 2010-2040 and to define the underlying factors/decision variables that affect to land use change and to use

Water allocation in the Chrey Bak catchment faces the management problem that can cause water scarcity. Thus, water management and allocation for agriculture is conducted using the WEAP model to predict water demand. The study depends on collected data such as, stream flow (discharge), irrigation water need for each irrigation scheme in the Stung Chrey Bak catchment which exist of 7 irrigation schemes. There are two scenario is created; the refer

Flood and drought have always been the most frequent disaster in the world record. Cambodia, being at rank of 116 of the most vulnerable country, has suffered so much from flood and drought. That’s why the main purpose of this study is to identify flood and drought characteristic. This study of flood and drought is based on CAESAR-Lisflood, a combination of CAESAR and LISFLOOD-FP. Study area of this case is Pursat Catchment. Calibration and valid

Discontinuous systems have been increasingly paid attention since they can be found ranging from physical to biological systems. In this paper we consider an effective estimation algorithm for systems with discontinuous vector field. We propose an incorporation between the existing recedinghorizon nonlinear Kalman filter (RNKF) and the unscented transformation, which is named receding-horizon unscented Kalman filter (RUKF). The use of unscented t

The influences of climate change have also covered Stung Chrey Bak Catchment,with increasing the significant issues over water demands for irrigation schemes. Thus, the aim of this research is to predict water demands of each irrigation schemes through climate change scenarios, using Water Evaluation and Planning model (WEAP). Stung Chrey Bak catchment consists of seven irrigation schemes. Two demand management scenarios were developed for this s