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Availability of Rainfall in Bangladesh

M. M. Huq
Department of Farm Power & Machinery, Bangladesh Agricultural University, Mymenslngh

Alam
Department of Farm Power & Machinery, Bangladesh Agricultural University, Mymenslngh

T. Islam
Undergraduate student, Department of Farm Power & Machinery, Bangladesh Agricultural University, Mymenslngh

S. G. Costa
Undergraduate student, Department of Farm Power & Machinery, Bangladesh Agricultural University, Mymenslngh

Abstract/ Executive Summary:

The paper presents various statistical information on the availability and fluctuation in the distribution of rainfall in Bangladesh. Thirteen weather stations having 28-35 year monthly rainfall records were considered in this study. Seasonal distributions of monthly rainfall amounts was studied dividing the year into three seasons. Dividing the monthly mean rainfall amounts into classes of width 50 mm/m, frequency percentage distribution of rainfall amounts were made and monthly rainfall probabilities at 10, 20, 40, 50,75 and 80 percent level were estimated using ranking method. The mean monthly rainfall amounts were regressed with the probable rainfall amounts at 40, 50 and 75 percent level.

Keywords: Rainfall. Fluctuation, Statistics, Frequency, Quartiles, Variability. Probability. Irrigation

Location: Department of Farm Power & Machinery, Bangladesh Agricultural University,Mymenslngh.

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Rain water

Objectives:

To calculate rainfall probability and rainfall distribution for some selected locations in the country.

Methodology:

Monthly rainfall data on daily basis having 25 to 35 years (1950-1984) records for about 25 weather stations in Bangladesh were collected from the Mateorological Department. Locations having complete records were considered in this study. Almost all the stations had some missing data specially for the period of liberation war and these records were ignored in the analysis. Distribution of rainfall was studied dividing the year into three seasons. Rainy season (June-October), Dry season (Nov-March) and Little Rainy season (April-May). The simple statistical methods used in analyzing the rainfall distributions are monthly mean rainfall, standard deviation median. co-efficient of variation. quartiles and frequency percentage distributions. The monthly totals of rainfall for each month were divided into classes of width 50 mm/m including a class for zero rainfall. Then for all the months during 25- 35 years rain fail records having complete data. the frequency distribution of the observed monthly totals into these classes was determined for each month using the computer to count the occurrences in the 25-35 years of data. These frequency distributions were then converted into percentage distribution. Rainfall probability is the amount of assured rainfall occurrence, or the amount of rainfall that can be anticipated on an average, to be equaled or exceeded during a percent of time

Source of Information: Banqladesh J. Agrll. Scl. 15(1): 143-149; 1988

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Seasonal distributions of monthly rainfall amounts was studied dividing the year into three seasons. Dividing the monthly mean rainfall amounts into classes of width 50 mm/m, frequency percentage distribution of rainfall amounts were made and monthly rainfall probabilities at 10, 20, 40, 50,75 and 80 percent level were estimated using ranking method. The mean monthly rainfall amounts were regressed with the probable rainfall amounts at 40, 50 and 75 percent level.

Knowledge Management: Journal