Hydrology
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Item Restricted The use of an agricultural rainfall index in Malaysia(Springer, 1982) M. Z. Ghazalli; S. NieuwoltMonthly rainfall probabilities of 80% are expressed as percentage of the potential evapotranspiration. This monthly value, called the Agriculture Rainfall Index, is used in zoning Peninsular Malaysia into agroclimatic regions, based on length of dry periods. Four agroclimatic zones are recognized in Peninsular Malaysia. These are (a) regions which have regular dry seasons for up to four months, (b) regions which have less regular and shorter dry seasons, (c) regions with a fairly regular occurrence of two dry seasons per year, and (d) regions with low risks of a dry period.Item Restricted Temporal and spatial characteristics of rainfall in Kuala Lumpur, Malaysia(Elsevier, 1996) M.N. Desa; J. NiemczynowiczKnowledge of temporal and spatial characteristics of rainfall in Kuala Lumpur, Malaysia is still lacking and they are still considered important for more efficient management of the implemented urban water resources projects. In view of this, a study was conducted to characterise the historical rainfall phenomena (from 1982 to 1992). Statistical properties of annual, monthly, and minutes rainfall were derived.Item Restricted Dynamics of short rainfall storms in a small scale urban area in Coly Limper, Malaysia(Elsevier, 1997) M.N.M. Desa; J. NiemczynowiczShort term storm rainfalls are recorded with a dense network of fine resolution rain gauges well distributed in a small urban catchment in Kuala Lumpur, Malaysia. The period of data collection covers the south-west monsoon (July-September), inter monsoon (October) and partly the north-east monsoon (November-December) seasons. This paper presents some findings with reference to the dynamic properties of short rainfall storms using the method of vector analysis and farther correlation analysis.Item Open Access Monthly distribution of precipitation in Peninsular Malaysia(Universiti Pertanian Malaysia Press, 1998) Alejandro Livio Camerlengo; Mohd. Nasir Saadon; Ahmad Shazli Aziz; Mohd. Rosni OthmanA study was made of the monthly distribution of rainfall in Peninsular Malaysia. It is shown that the principal influence is given by the passage of the Intertropical Convergence Zone (ITCZ), while the secondary influence is the effects of both the NE and the SW monsoons.Item Open Access Modelling evaporation and evotranspiration under temperature change in Malaysia(Universiti Pertanian Malaysia Press, 2000) Md. Hazrat Ali; Lee Teang Shui; Kwok Chee Yan; Aziz F. EloubaidyTemperature change has a direct effect on hydrology through its link withevapotranspiration. The potential impact of temperature change on the evapotranspiration is assessed; using a modelling approach based on a fewphysical weather measurements. Methods to estimate free-surface evaporation and potential evapotranspiration , without any model calibration parameters, for monthly time series are presented.Item Open Access On the monthly distribution of precipitation in Sarawak(Universiti Pertanian Malaysia Press, 2000) Alejandro Livio Camerlengo; Mohd. Nasir Saadon; Mohd. Azmi Ambak; Lim You RangIn this investigation the study of the monthly distribution of precipitation and the rainfall variability of Sarawak is addressed.Item Open Access Monthly and annual distribution of both the frequency of rainy days and rainfall intensity in Peninsular Malaysia(Universiti Pertanian Malaysia Press, 2000) Alejandro Livio Camerlengo; Nhakhorn SomchitThe aim of this study is to analyze both the monthly and the annual distributions of both the frequency of rainy days and the rainfall intensity in Peninsular Malaysia.Item Open Access Monthly and annual rainfall variability in Penisular Malaysia(Universiti Pertanian Malaysia Press, 2000) Alejandro Livio Camerlengo; Nhakhorn SomchitThis paper re-addresses the study of the rainfall variability in Peninsular Malaysia. An earlier investigation has been conducted forty years ago. Due to the fact that: (1) a larger and more sophisticated number of meteorological stations is nowadays in place, and (2) the effect that global warming has on precipitation, we feel that a new study of rainfall variability is both timely and pertinent. This is, therefore, the aim of this particular study. Our results show that larger variability does not (always) occur whenever lowest rainfall is recorded.Item Open Access Monthly distribution of preciptation and evaporation difference in Sabah and Sarawak(Universiti Pertanian Malaysia Press, 2000) Alejandro Livio Camerlengo; Mohd. Nasir SaadonIn spite of the fact that the annual pattern of precipitation and evaporation difference, P - E, is completely different in East Malaysia compared to Peninsular Malaysia. It is shown that this difference is also positive in both Sabah and Sarawak.Item Open Access Rainfall in Sarawak(Universiti Pertanian Malaysia Press, 2000) Alejandro Livio Camerlengo; Mohd. Azmi Ambak; Mohd. Nasir SaadonThe main objective of this study is to help understand, on a monthly basis, both the rainfall intensity and the distribution of rainy days in the state of Sarawak.Item Restricted Probable maximum precipitation for 24 h duration over southeast Asian monsoon region - Selangor, Malaysia(Elsevier, 2001) M.N. Desa M.; A.B. Noriah; P.R. RakhechaThe probable maximum precipitation (PMP) for stations in Malaysia using Hershfield formula is routinely estimated as mean plus 15 standard deviations processed from yearly maximum rainfall values. The value of 15 as frequency factor is too high for a humid region such as Malaysia. In this paper, yearly maximum 1-day rainfall data of about 30-60 years for 33 stations in the region of Selangor, Malaysia, were analysed in an attempt to estimate PMP for 1-day duration based on an appropriate frequency factor for the first time.Item Restricted Rainwater Composition and Acidity at Five Sites in Malaysia, in 1996(Kluwer Academic Publishers, 2002) G. P. Ayers; Leong Chow Peng; R. W. Gillett; Lim Sze FookRainwater chemical composition and acidity were determined from weekly-averaged wet-only rainwater samples collected atfive sites in Malaysia throughout 1996. The major aim of this work was to assess the extent to which acid deposition, found previously at one site in the Klang Valley, was a general,rather than local, phenomenon.Item Embargo Data Banjir KL 2003-2015(Fakulti Kejuruteraan dan Alam Bina (FKAB), 2003)Data banjir yang diambil daripada beberapa kawasan di Kuala Lumpur bermula dari tahun 2003 hingga 2015. Ukuran diambil berdasarkan tempoh (duration), keamatan (intensity) dan kedalaman banjir (flood depth).Item Restricted Estimation of evaporation and evapotranspiration in Malaysia using Penman and Christiansen methods(Universiti Malaysia Sabah, 2004) Ng Meng Wai; Alejandro Camerlengo; Ahmad Khairi Abdul Wahab; Sobri HarunThis study is to introduce the Christiansen's model for evaporation and potential evapotranspiration that provided exceptionally good results in Central Asia and to compare it with Penman's model and pan evaporation values.Item Open Access Modelling of changes in evapotranspiration for an area in Peninsular Malaysia(Universiti Pertanian Malaysia Press, 2005) Lee Teang Shui; M.M.M. Najim; M. Aminul Haque; Huang Yuk FengA study was carried out to check the sensitivity of evapotranspiration estimation due to changes in climate. The study used 30 years of data from the meteorological station in the FELCRA paddy estate, Seberang Perak, Peninsular Malaysia. The effect of changes in the climatic variables, temperature, solar radiation, relative humidity and wind speed on evapotranspiration were analyzed.Item Restricted Annual water balance and seasonality of evapotranspiration in a Bornean tropical rainforest(Elsevier, 2005) Tomo omi Kumagai; Taku M. Saitoh; Yoshinobu Sato; Hiroshi Takahashi; Odair J. Manfroi; Toshiyuki Morooka; Koichiro Kuraji; Masakazu Suzuki; Tetsuzo Yasunari; Hikaru KomatsuThis study presents the results of 2 years combined field measurements of water vapor exchange with the atmosphere and simplified model calculations at Lambir Hills National Park, Sarawak, Malaysia (4 12'N, 114 02'E). The study site was located in a lowland mixed dipterocarp forest, a major type of Bornean tropical rainforest, where there is no clear seasonality in environmental factors such as radiation, temperature, vapor pressure deficits and precipitation; instead, unpredictable dry spells often occur throughout the year.Item Open Access Characteristics of short-duration extreme rainfalls in Selangor, Malaysia(Wiley, 2006) M. N. Desa; P. R. RakhechaA short-duration rainfall analysis for Kuala Lumpur and part of the Malaysian state of Selangor was made by Desa (1997) but a detailed analysis is still lacking for other raingauges in the state. Here we analyse historical rainfall records from rain gauges from the whole of Selangor, located in the equatorial region so as to provide information on short-duration extreme rainfalls and to estimate their frequency of occurrence.Item Restricted Probable maximum precipitation for 24-h duration over an equatorial region: Part 2-Johor, Malaysia(Elsevier, 2007) M.N. Desa M.; P.R. RakhechaProbable maximum precipitation (PMP) is a characteristic of rainfall at a particular location that can be used in designing water impounding structures. The PMP for rainfall stations in Malaysia by Hershfield statistical method in earlier studies was estimated using a frequency factor of 15 which is the highest value in the world. The value of 15 as frequency was found to be too high for a humid country like Malaysia. The objective of this study therefore was to provide a fresh and reliable estimates of PMP in Malaysia using historical rainfall data.Item Restricted Mixed log series geometric distribution for sequences of dry days(Elsevier, 2009) Sayang Mohd Deni; Abdul Aziz JemainThe development of rainfall occurrence models is continuously being explored by a number of researchers in the field since the 20th century. In order to further enhance the development of rainfall occurrence modeling, this present study is aimed to propose a new probability model which is able to describe the daily series of rainfall occurrence, particularly on the duration of consecutive dry or wet days in Peninsular Malaysia.Item Restricted Rainwater Harvesting as an Alternative Water Supply in the Future(EuroJournals Publishing, Inc., 2009) Che-Ani A.I; Shaari N; A. Sairi; M.F.M. Zain; M.M. TahirThis paper discuss about the rainwater harvesting system and its implementation in Malaysia as part of the solution proposed by government to avoid water crisis in the future. It first reviewed the scenario of water shortage in Malaysia.