Browsing by Author "Tigistu, Tamiru"

Now showing 1 - 1 of 1
  • No Thumbnail Available
    Item
    Analysis of Drought with Respect to Water Resources Availability and Water Quality: The case of Nyangatom Woreda, Southern Ethiopia
    (Addis Ababa University, 2020-06) Tigistu, Tamiru; Teferi PhD, Ermias
    Drought expressed in terms of failure and shortage of rainfall is the major hazard that affects the livelihood of the Nyangatom people. The objective of this study was exploring the occurrence of droughts and their impacts on water resources availability and Water Quality at Nyangatom Woreda. Based on the result of the SPEI-3 month values was used represented in ( Annex4),there are a severe drought on the study area from June 1999 and November, December 2010 this implies that the soil moisture, SPEI-6 month values SPEI value may also begin to be associated with anomalous stream flow and reservoir conditions deficit occurred from March 1997 ,SPEI12 to 24 month value , month duration were recorded in grid cells in one periods, namely in the years 1999-2003 this implies that the deficit surface water and ground water. In addition to result of the study indicated in SPEI –index, the SPEI value is less than or equal to −1 observed that the occurrence of months in which drought was detected in all severity classes within the range 72-81 and corresponds to about 19-21% of the entire time under analysis and also SPEI time series -1, 3,6,12 and 24 calculation, drought severity, duration and intensity were analysis obtained maximum duration of grid point, SPEI-24 has shown in (Figure .8) ranges between 3-7 years in category short until long duration ,the highest severity recorded at the meteorological grid point occurred SPEI result at 1999-2003 which a peak of drought with index value range - 1.38 up to -6.20 (extremely dry) and Highest intensity that occurred in grid cell -1.09 in 2009 to 2012 the highest intensity for SPEI-24 was recorded in meteorology station. SPEI –index, statistically analysis used Non-parametric methods have been developed to detect trends in hydro meteorological time series. In the SPEI-3 monthly series, a drying trend occurred only in March statically significant and SPEI-6 and SPEI-24 monthly series, a drying trend occurred four month in February, March, April and June and the result is statistically significant in the representation .Therefore, the result of February up to June often drought occurrence in this month represented and time series representing longer time scales a decreasing trend. Based on this the researcher tried to recommend that carrying out capacity building training to the woreda water experts is essential to ensure the appropriate implementation of water management and biodiversity, the woreda administration should create awareness to the people to reduce or stop vegetation clearance using fire that affect the biodiversity of the area