Kshipra Sub Basin - Asian Development Bank

Support to the National Water Mission NAPCC
Appendix 3 Kshipra Sub Basin 7
Figure 9: Deviation from Mean Annual Rainfall at IMD Grids
% Deviation from mean
200
150
100
50
0
-50
-100
1971
1973
1975
1977
1979
1981
10. Figure 9 shows deviations from the mean of annual precipitation in the Kshipra basin in the period
from 1971 to 2005. Precipitation is variable in space and time, and there is no evidence of trend in the
data.
2. Seasonal Precipitation
1983
1985
1987
11. Seasonal precipitation has been analysed in a similar way to that of annual precipitation. For the
purposes of analysis, seasons were defined as; March, April, May (MAM) June, July, August, September
(JJAS); October, November, December (OND); January, February (JF).
12. Figure 10 shows mean annual precipitation for the four seasons and Figure 11 the coefficients of
variation. During MAM precipitation is generally negligible and coefficients of variation are thus high, and
increase from southeast to northwest. During JJAS season approximately 93% of the annual rainfall in
the Kshipra basin occurs, coefficients of variation are significantly lower than in MAM, and the data are
less skewed. During OND there is little variation precipitation across the basin, with mean values of
approximately 50mm. January-February (JF) is the driest season, with such low rainfall there is significant
inter-annual variability and coefficients of variation are high. variations higher in the northwest than in the
southeast.
1989
1991
760230pcp 755235pcp
1993
1995
1997
1999
2001
2003
2005