1 - Alaska Energy Data Inventory

(2) Condition A - Maximum surge for condition A was calculated byfour different methods; two were manual and two were aigital computerso1utions. The manual methods were based upon the Calame Gaaen charts anathe R.D. Johnson charts. The digital computer programs were "MSURGE" ana"WHAMO." The Reservoir surface elevation for the condition was 1,022 ft,which is the maximum power pool used for transient calculations. Maximumsurge elevations for the various methods were as follows:Method1. Calame - Gaden2. R.D. Johnson3. Computer Program "MSURGE"4. Computer Program "WHAMO"Surge TankWater Surface Elevation1064.7 ft.1064.5 ft.1063.7 ft.1064.2 ft.The results of program "WHAMO" were used for the maximum wate'rsurface elevation at the Surge Tank. The other methods check within0.5,ft indicating that the solution is a dependable one. For program"MSURGP the elevation in the surge tank at the start of rejection wasequal to 1,014.25 ft with a power conduit discharge of 477.5 ft 3 /sresulting in a surge of 49.4 ft. For program "WHAMO" the elevation in thesurge tank at the start of rejection was equal to 1,013.7 ft with a powerconduit discharge of 467.8 ft 3 /s resulting in a surge of 50.5 ft.Plate B19 illustrates the similar results produced by "WHAMO" and "MSURGE".(3) Conditions B&C - Conditions Band C being at lower net headsthan Condition A, will require more discharge for the blocked output of34,500 kW resulting in larger rejection surges. Surge tank calculationsfor Band C were done by program MSURGEbecause of its simpl icity andproven accuracy. Surges for Band C were 51.4 ft and 56.9 ftrespectively. Maximum surge elevations for Band C were 978.0 and 926.3respectively.Conditions Band C have greater surges but result in lesserquarter cycle elevations in the surge tank, and therefore, do not governthe top elevation of the tank.The top elevation of the tank will be at1,150 ft. This elevation represents the point at which the surge tankdaylights and gives adequate freeboard for the maximum water surfaceelevation of 1064.2.B3-11