Measurement Of The Remaining Storage And Rate Of Siltation In Tagwai Impounding Reservoir Niger State

An attempt was made to measure the remaining storage of Tagwai Impounding Reservoirusing bathymetric mapping and remotely sensed surface area data. A field study on Tagwaireservoir was carried out in Tagwai drainage basin, Niger State, Nigeria. The depths of wateraccompanied with their corresponding coordinates were measured from which area and storagewere calculated based on data acquired from the field and that from satellite images. Theremaining storage was at the time of measurement, in year 2010, the same as the total storageof the reservoir presently because the dead storage has been already silted up. Remainingstorage was in year 2010, 21,650,648 m3 i.e. 76.5 % of the original storage. Thus, rate at whichthe storage shrunk from 1978 and 2010 is 207,792 m3/ year. Losses to siltation are 6,649,352m3 during a period of 32 years. This corresponds to the average annual loss to siltation of 0.73%. The reservoir will be completely silted up in 136 years from the date of its impoundment i.e.in the year 2114, if the rate of siltation is not reduced by upgrading the environment in thedrainage basin.

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