Soil Conservation Research Demonstration and Training Centre, Government of India, Dehra Dun.
Rainfall is the most dominant component of the hydrologic cycle affecting several important hydrologic phenomena. Rainfall data is needed by all agencies dealing with the use and management of natural resources. The total and distribution of rainfall, intensity, duration and frequency data are often needed for design of structures, analysis of erosion and flood problems. The annual and seasonal data are represented by a bar diagram. Normals have been calculated for the same. The frequency curve for Dehra Dun has been plotted, and tables have been prepared to estimate rainfall for various recurrence intervals and percentage chances. The frequency and duration analysis has been made for 24 hours and less duration and tables have been prepared for rainfall intensities of various durations and frequencies. Mathematical equations for frequency curves have been developed for various durations and probable maximum rainfall. The paper further brings out the need for similar analysis for other localities to prepare an isopluvial map of India for various duration and recurrence intervals.
