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Two Rivers Gravel Pit Mine
<br /> Riverside Berm Failure Analysis
<br /> and Flood Control Mitigation Plan
<br /> ' ' ' January 22,2020
<br /> TWO RIVERS
<br /> DESIGN HYDROGRAPHS (WINDAM C INPUT HGs)
<br /> FOR
<br /> REPRESENTATIVE HEADCUT AT BIG THOMPSON SIDE AND SOUTH PLATTE SIDE PITS
<br /> BT Side SP Side SP BT
<br /> Date Time Q Adjusted Q Adjusted Q- Q Q WinDAM WinDAM
<br /> (hr) (cfs) (cfs) 10-yr Q (cfs) (cfs) Headcut Headcut
<br /> (1) (2) (3) (4) (5) (6) (7) (8) (9)
<br /> 9/12/13 2400 0 100 540 0 0 0
<br /> 4 500 * 167 333
<br /> 8 1,500 * 500 1,000
<br /> 10:00 12 3,000 16,200 2,700 900 1,800
<br /> 16 6,000 * 2,000 4,000 0
<br /> 18:45 20 4,250 22,950 9,450 3,150 6,300 300
<br /> 9/13/13 1:00 24 5,000 27,000 13,500 4,500 9,000 3,000
<br /> 32 15,000 * 5,000 10,000 4,000
<br /> 36 15,500 * 5,167 10,333 4,333
<br /> 40 17,000 * 5,667 11,333 5,333
<br /> 44 18,000 * 6,000 12,000 6,000
<br /> 9/14/13 12:00 48 6,000 32,400 18,900 6,300 12,600 6,600
<br /> 52 17,500 * 5,833 11,667 5,667
<br /> 56 16,000 * 5,333 10,667 4,667
<br /> 60 15,000 * 5,000 10,000 4,000
<br /> 64 14,000 * 4,667 9,333 3,333
<br /> 68 13,000 * 4,333 8,667 2,667
<br /> 72 11,500 * 3,833 7,667 1,667
<br /> 76 10,000 * 3,333 6,667 667
<br /> 80 9,000 * 3,000 6,000 0
<br /> 84 7,500 * 2,500 5,000
<br /> 88 7,000 * 2,333 4,667
<br /> 92 5,500 * 1,833 3,667
<br /> 9/16/13 15:00 96 3,400 18,360 4,860 1,620 3,240
<br /> pg. 27
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