The present study has further confirmed the inverse relationship between the intensity of the southern hemispheric equatorial trough, (SHET) arid the activity of the southern monsoon over India. Continuous monitoring of weekly mean cloudiness in the zone of SHET may, therefore, serve as an useful tool in foreshadowing wet spells of rainfall over India during the southwest monsoon.
An all time record flood occurred in the Yamuna river in September 1978 in Delhi surpassing the previous major floods of 1924. 1947 and 1976. This record flood caused colossal loss to life and property.
The present study deals with a detailed analysis of rainfall resulting in the floods and the associated synoptic situations.
This paper aims at evolving a conceptual technique for the computation of water yield from the basin snow cover. It may serve as a useful information to compute the snowmelt driven run-off particularly in the lean summer season. For this purpose, the measurement of snow cover area in catchment of Satluj river using very high resolution imagery received from the meteorological satellite NOAA-9 was undertaken on selected dates during the periods, (i) October 1985 to May 1986, and (ii) January to June 1987. The computed snowmelt water yield have been compared with the available actual run-off data.
The study shows that the satellite derived snow cover data are potentially useful in predicting the snowmelt run-off. The importance of this technique is further enhanced for the large watersheds over Himalayas where ground based measurements are too scanty.
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