Table 2: The Silt Aspect in Generation Tailwater Channel Observation Date Sand Amount over Designed Height Scouring Pit below Designed Height Sept, 1984 29,375 18,165 Oct, 1984 30,045 14,082 Nov, 1984 34,446 13,157 Dec, 1984 32,896 7,874 Jan, 1984 32,950 12,551 March, 1985 32,866 12,485 April, 1985 33,720 9,450 July, 1985 30,355 5,868 Sept, 1985 37,618 12,427