THE REMAINING STORAGE AND RATE OF SILTATION OF MAIRUWA DAM IN FUNTUA, NORTH CENTRAL NIGERIA
THE REMAINING STORAGE AND RATE OF SILTATION OF MAIRUWA DAM IN FUNTUA, NORTH CENTRAL NIGERIA
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Date
2014-05
Authors
SALAWU, ABDULAZEEZ OZOMARI
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Abstract
Mairuwa Dam is located at the outskirt of Funtua town in north western Nigeria. It was constructed in 1970 with a storage capacity of 5.5 million cubic metres for irrigation and water supply to Funtua and its environ. After 41 years of siltation since impoundment, it is not known how much water is left in the reservoir or how much sediment is being deposited annually. To determine the volume of water available in the reservoir, the author embarked on measurement of the remaining storage of the reservoir. The measurement was done using boat, measuring tape,, satellite navigator (GPS) and a heavy object to measure depth and edge of water table during the rainy season when the spillway is flowing. From the result of these measurements, a bathymetric map of the impounding reservoir was produced. The area bounded by the water was then determined by the least square method. The area calculated which is enclosed by successive isobaths was multiplied by the average depth obtained to get the volume. The results obtained from the measurements shows that the remaining storage capacity for the present year 2011 is 3,905,929 m3. Average depth from spillway is 2.60 m. The rate of siltation between 1970 and 2011 was calculated to be 38,880 m3/a. this represents storage loss of 0.70% per annum. At this rate, the dam will be silted up in the year 2111.the rate of erosion in the drainage basin of 102 km2 was calculated to be 0.45 mm/a. This is 511% higher than the world average of 0.088 mm/a.
Description
A THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL, AHMADU BELLO UNIVERSITY, ZARIA. NIGERIA IN PARTIAL FULFILLMENT FOR THE AWARD OF MASTER OF SCIENCE DEGREE IN GEOLOGY DEPARTMENT OF GEOLOGY AHMADU BELLO UNIVERSITY, ZARIA NIGERIA
MAY, 2014
Keywords
REMAINING STORAGE,, RATE,, SILTATION,, MAIRUWA DAM,, FUNTUA,, NORTH CENTRAL NIGERIA