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This report presents a detailed calculation of the mean annual flow per unit area for the Upper and Lower Blanco drainage areas. The Upper Blanco has a total drainage area of 0.619 km² and an annual flow of 68.14 ft³/s, with annual precipitation recorded at 912 mm. For the Lower Blanco, covering 1.130 km² (with 0.511 km² as incremental), the mean annual flow is 123.76 ft³/s and precipitation is 930 mm. The mean annual flow represents about 10% of the precipitation in the Upper Blanco area.
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Mean annual flow per unit area calculation Upper Blanco Total Drainage Area: 619 km2 Incremental Area: 619 km2 (No upstream inflows) Mean Annual Flow: 68.14 ft3/s Precipitation: 912 mm Annual Flow Volume Annual Flow per unit area Flow is about 10% of Precipitation. This makes sense
Mean annual flow per unit area calculation Lower Blanco Total Drainage Area: 1130 km2 Incremental Area: 511 km2 (1130-619 from Upper Blanco) Mean Annual Flow: 123.76 ft3/s Precipitation: 930 mm Annual Flow Volume Annual Flow per unit area