(1) Figure (a) shows a plan view of Wasco reservoir east of Portland, Oregon. Figure (b) shows the area-capacity curve f

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1 Figure A Shows A Plan View Of Wasco Reservoir East Of Portland Oregon Figure B Shows The Area Capacity Curve F 1 (381.71 KiB) Viewed 45 times

(1) Figure (a) shows a plan view of Wasco reservoir east of Portland, Oregon. Figure (b) shows the area-capacity curve for the reservoir. The storage reserved for conservation (iirigation) is between elevation 3488 ft and 3514 ft. The data in the table below shows the mean monthly flows for the creeks discharging into the Wasco reservoir and pan evaporation estimates during a drought period. (a) For this reservoir, what outflow could be assured during the drought period? (b) Determine the wave height and runup under a maximum wind speed of 80 miles per hour for Wasco Dam which is a 50-ft earth dam with an upstream slope of 1 V to 2.5 H. The reservoir side of the embankment is surfaced with 24-in riprap. Use a 10% for Waves Exceeding Specific Wave Height. 3530 N 3520 Maximum W.S. EI. 3520 Normal W.S El. 3514.4 Capacity 3510 Reservoir water surface elevation 3500 3490 Area 3480 Wasco Dam 7 Feet 0 1000 2000 3000 Th 0 500 1000 Clear Creek 3470 0 1 2 3 4 5 6 Area in hundreds of acres 0 3 6 9 12 15 18 Capacity in thousands of acre-feet (b) Area-Capacity curves for Wasco Reservoir 21 Meters (a) Wasco Reservoir Flow (cfs) Month Pan Evaporation (in.) 1975 1976 1977 1978 (4-33740ZO 13 67 30 62 23 26 39 56 57 6 20 15 30 10 12 14 20 10 4 18 25 23 15 20 24 19 15 8 6 8 14 55 41 56 37 29 42 61 45 12 7 6 0.5 0.2 0.0 0.0 0.0 0.5 3.0 4.0 5.0 7.0 6.0 4.0 5 7 3 2