Nyoni and Kaseke
Greener Journal of Physical Sciences Vol. 4 (1), pp. 007-012, January 2014.
ISSN: 2276-7851 © 2011 Greener Journals
Manuscript Number: 1210131022
Assessing Water Availability in the Odzi Sub-Catchment of Zimbabwe using T.B. Mitchell’s Yield Estimation Method
Kosamu Nyoni*, Evans Kaseke
Faculty of Agriculture and Natural Sciences, Great Zimbabwe University, Zimbabwe.
*Corresponding Author’s Email: firstname.lastname@example.org
Climate change influences water availability by either
increasing or decreasing rainfall and mean annual runoff.
This study investigates available water resources of a
selected micro catchment of the Odzi sub catchment. It
specifically investigates the present commitment levels of
available water resources in the sub catchment. Results show
that the study area catchment size is about 7% that of Save
catchment, yet the net contribution of the yield is about
59% that of Save catchment. This shows that the greatest
amount of rainfall most probably falls in this part of the
Save catchment. Results also show that the micro catchment
has the capacity to supply 433832 people with water for
basic human needs as well as for growing food per annum.
However, the estimated number of people in the micro
catchment is 33409. This means that the amount of committed
water is 7.7% of the total available water in the micro
catchment. This leaves 92.3% being uncommitted. There is,
thus no water scarcity in the micro catchment. In this case,
water availability is much higher than demand; the
opportunity cost of the water will fall to the next best
type of use. Therefore, under such a scenario, inter basin
transfers are very possible.
Keywords: climate change, rainfall, runoff, trend analysis, catchment yield, water resources, water availability.