Hydrology Properties at Sembrong Dam Reservoir in Johor Halizah Awang 1, a , Zawawi Daud 2,b , Tan Lai Wai 2,c and Mohd Zainuri Mohd Hatta 2,d 1 Faculty of Technical and Vocational Education, Universiti Tun Hussein Onn Malaysia, 86400 Parit Raja, Batu Pahat, Johor Malaysia 2 Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia, 86400 Parit Raja, Batu Pahat, Johor Malaysia a halizah@uthm.edu.my, b zawawi@uthm.edu.my, c laiwai@uthm.edu.my, d mzainuri88@gmail.com Keywords: Sembrong dam, water catchment, rainfall, soil and evaporation. Dam reservoir required a proper management that all components of the water resource system be known. This study focused on soil condition, rainfall and evaporation by Sembrong dam in Johor. The available data from soil loss estimation by environment impact assessment (EIA) and average of year from 1984 to 2009 daily rainfall and evaporation data across the Sembrong dam catchment by the Water Resources Management and Hydrology Division, Department Of Irrigation and Drainage, Malaysia. Result indicated that soil loss about 487.12 kg/km 2 /day, for rainfall and evaporation records are 1862 mm and 1098 mm. This result effect on the water quality of water in Sembrong dam reservoir in Johor by those hydrology charateristics.. Introduction Water is fresh potable water where is not always available at the right time or the right place for human or ecosystem use [1]. Water impoundments constructed by damming rivers are called dam reservoirs. Under the Malaysian Western Johore Agricultural Development Project, the main function of the Sembrong dam is flood mitigation. The secondary function of the dam was to provide a clean water supply to 240,000 consumers in Kluang district area where used for daily activities [2]. Water from the Sembrong dam reservoir is treated at the West Sembrong Water Treatment Plant before the distribution. Daily reservoir inflow data were extracted by applying the water balance model to the Sembrong dam reservoir. Developing hydrologic hazard curves for risk assessment uses the length of record and type of data to determine the extrapolation limits for flood frequency analysis [3]. Extrapolation beyond the data is often necessary to provide information needed for dam safety risk assessments [4]. The sources of information used for flood hazard analyses include stream flow, precipitation records and flood data. Methodology Study Area and Sampling Methods Sampling stations were selected based on criteria of utilization of water and effect nearby activities. Sembrong Lake was located in the districts of Air Hitam and Kluang, within the range of 2°01′35″N - 1°58′29″N latitude and 103°09′32″E - 103°12′57″E longitude (Figure 1). Applied Mechanics and Materials Submitted: 2014-10-03 ISSN: 1662-7482, Vols. 773-774, pp 1330-1334 Revised: 2014-11-25 doi:10.4028/www.scientific.net/AMM.773-774.1330 Accepted: 2015-01-10 © 2015 Trans Tech Publications Ltd, Switzerland Online: 2015-07-15 This is an open access article under the CC-BY 4.0 license (https://creativecommons.org/licenses/by/4.0/)