Homework
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This document contains runoff data from the Ban Yan Din Daeng watershed in Surat Thani, Thailand from 1969 to 2006. It shows the monthly and annual runoff in million cubic meters (MCM) and cubic meters per second (CMS). Runoff was highest from September to November and lowest from February to April. On average, annual runoff was 3758.20 MCM or 119.17 CMS, but varied significantly from year to year.
![Runoff in Water Year [Ban Yan Din Daeng, A. Phrasaeng, Surat Thani, (X.37A)]
Runoff
Year Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar
MCM CMS
1969 - - - 460.20 280.0 1 58.70 722.60 893.80 330.70 189.90 77.20 49.80 2782.90 88.25
1970 53.14 74.56 154.83 249.78 459.04 417.31 569.55 678.59 433.38 189.13 58.49 83.20 3421.00 108.48
1971 36.89 49.94 68.52 104.98 90.29 129.17 522.12 303.96 443.66 170.12 56.16 38.71 2014.52 63.88
1972 61.78 64.20 71.11 96.34 117.50 341.28 594.09 600.48 574.73 134.96 54.86 40.35 2751.68 87.26
1973 33.83 109.56 215.48 539.65 467.17 521.08 539.83 1051.40 752.37 212.72 81.13 62.04 4586.26 145.43
1974 51.20 150.90 154.50 182.30 296.00 377.10 676.90 955.70 617.20 2166.70 227.90 129.40 5985.80 189.81
1975 87.01 172.37 518.40 319.08 390.53 354.50 555.03 781.23 377.40 119.06 57.54 42.60 3774.75 119.70
1976 53.31 195.70 212.11 164.16 272.77 513.73 465.35 604.11 482.98 164.07 65.32 48.04 3241.65 102.79
1977 48.99 62.55 72.06 98.93 168.83 300.07 521.34 654.13 287.54 117.16 62.81 49.16 2443.57 77.49
1978 78.07 190.23 271.48 424.17 409.16 506.01 516.53 427.35 263.14 103.51 56.03 46.28 3291.96 104.39
1979 61.34 89.64 183.73 825.89 665.98 588.72 627.55 532.73 355.61 110.99 62.16 67.21 4171.55 132.28
1980 47.20 90.40 256.80 587.40 691.10 818.70 904.90 880.80 730.90 188.00 86.60 69.70 5352.50 169.73
1981 60.56 245.98 375.72 136.22 84.49 184.09 256.06 615.49 779.89 122.09 50.58 46.23 2957.40 93.78
1982 80.05 216.02 338.78 723.70 549.07 484.84 640.99 669.58 274.41 105.05 43.17 23.74 4149.40 131.58
1983 24.37 72.83 219.54 275.42 453.33 527.29 779.03 634.30 240.69 131.73 124.90 61.19 3544.62 112.40
1984 72.37 228.39 283.02 426.92 226.26 311.77 706.96 300.21 795.66 429.95 123.16 112.43 4017.10 127.38
1985 77.13 276.91 347.46 152.33 180.92 348.36 739.73 623.25 350.77 144.10 56.45 38.16 3335.57 105.77
1986 38.60 192.40 180.80 366.50 593.60 1071.10 1192.10 846.80 461.00 161.00 77.20 57.40 5238.50 166.11
1987 40.98 87.43 167.94 59.77 377.41 382.76 464.12 585.95 847.87 210.84 96.32 55.94 3377.33 107.09
1988 63.30 176.10 72.50 354.10 347.10 704.00 749.50 1416.10 668.20 192.00 82.60 63.60 4889.10 155.03
1989 72.61 139.13 140.02 215.02 309.34 410.51 752.13 551.03 115.70 56.84 33.14 32.39 2827.86 89.67
1990 47.20 86.50 123.10 89.60 187.30 202.50 436.90 709.70 376.30 119.20 63.20 61.50 2503.00 79.37
1991 34.16 103.82 248.95 327.03 516.36 708.06 618.98 437.73 272.33 216.25 70.60 43.01 3597.28 114.07
1992 27.29 51.48 52.88 48.06 232.06 339.59 608.74 611.23 190.37 88.72 43.61 41.29 2335.32 74.05
1993 56.00 67.40 71.60 203.00 209.00 477.10 848.70 625.20 1144.90 452.60 124.60 119.90 4400.00 139.52
1994 106.04 243.62 227.86 226.36 452.28 821.62 786.31 589.85 512.00 163.95 75.55 52.30 4257.74 135.01
1995 43.24 34.09 72.74 88.70 437.49 703.10 581.25 821.75 504.87 125.65 92.72 45.84 3551.44 112.62
1996 76.30 127.93 188.31 254.42 298.30 483.75 603.90 621.34 813.36 198.51 110.69 67.49 3844.30 121.90
1997 48.00 47.90 73.70 258.00 578.60 1005.70 908.30 630.10 354.30 107.80 44.30 26.60 4083.30 129.48
1998 28.20 29.50 100.00 204.70 435.50 771.50 1028.40 882.90 673.80 280.10 279.40 233.60 4947.60 156.89
1999 414.99 293.98 417.26 330.59 261.97 477.94 702.00 925.76 419.63 128.87 114.55 190.08 4677.62 148.33
2000 319.59 536.01 590.59 398.76 459.24 439.58 727.57 856.40 728.15 567.64 272.75 250.41 6146.69 194.91
2001 204.16 464.95 319.18 441.26 335.48 460.12 776.26 801.95 300.74 126.40 51.88 51.57 4333.95 137.43
2002 47.90 84.87 41.44 74.87 144.47 296.73 634.88 677.08 310.64 265.04 55.89 36.73 2670.54 84.68
2003 48.39 61.80 73.93 188.53 294.13 399.65 745.38 - 613.60 196.65 89.07 64.94 2776.07 88.03
2004 59.44 76.92 134.59 212.27 335.91 402.16 778.29 292.38 132.41 81.82 54.58 53.81 2614.58 82.91
2005 26.23 40.97 187.03 151.18 114.39 123.25 421.26 559.59 1098.08 465.25 277.56 114.53 3579.32 113.50
2006 - 487.21 567.54 794.29 479.25 534.39 825.07 345.01 165.33 90.85 - 49.00 4337.94 137.56
Average 75.83 154.71 210.69 290.91 349.23 473.63 671.81 675.54 494.60 239.35 93.37 71.58 3758.20 119.17
max 414.99 536.01 590.59 825.89 691.10 1071.10 1192.10 1416.10 1144.90 2166.70 279.40 250.41 6146.69 194.91
min 24.37 29.50 41.44 48.06 84.49 58.70 256.06 292.38 115.70 56.84 33.14 23.74 2014.52 63.88
STDEV 78.95 126.21 143.85 199.70 161.81 227.51 176.85 225.10 254.37 340.72 65.26 52.08 1011.04 32.06
April 75.83](https://image.slidesharecdn.com/random-120704092635-phpapp01/85/Homework-1-320.jpg)
Homework
- 1. Runoff in Water Year [Ban Yan Din Daeng, A. Phrasaeng, Surat Thani, (X.37A)] Runoff Year Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar MCM CMS 1969 - - - 460.20 280.0 1 58.70 722.60 893.80 330.70 189.90 77.20 49.80 2782.90 88.25 1970 53.14 74.56 154.83 249.78 459.04 417.31 569.55 678.59 433.38 189.13 58.49 83.20 3421.00 108.48 1971 36.89 49.94 68.52 104.98 90.29 129.17 522.12 303.96 443.66 170.12 56.16 38.71 2014.52 63.88 1972 61.78 64.20 71.11 96.34 117.50 341.28 594.09 600.48 574.73 134.96 54.86 40.35 2751.68 87.26 1973 33.83 109.56 215.48 539.65 467.17 521.08 539.83 1051.40 752.37 212.72 81.13 62.04 4586.26 145.43 1974 51.20 150.90 154.50 182.30 296.00 377.10 676.90 955.70 617.20 2166.70 227.90 129.40 5985.80 189.81 1975 87.01 172.37 518.40 319.08 390.53 354.50 555.03 781.23 377.40 119.06 57.54 42.60 3774.75 119.70 1976 53.31 195.70 212.11 164.16 272.77 513.73 465.35 604.11 482.98 164.07 65.32 48.04 3241.65 102.79 1977 48.99 62.55 72.06 98.93 168.83 300.07 521.34 654.13 287.54 117.16 62.81 49.16 2443.57 77.49 1978 78.07 190.23 271.48 424.17 409.16 506.01 516.53 427.35 263.14 103.51 56.03 46.28 3291.96 104.39 1979 61.34 89.64 183.73 825.89 665.98 588.72 627.55 532.73 355.61 110.99 62.16 67.21 4171.55 132.28 1980 47.20 90.40 256.80 587.40 691.10 818.70 904.90 880.80 730.90 188.00 86.60 69.70 5352.50 169.73 1981 60.56 245.98 375.72 136.22 84.49 184.09 256.06 615.49 779.89 122.09 50.58 46.23 2957.40 93.78 1982 80.05 216.02 338.78 723.70 549.07 484.84 640.99 669.58 274.41 105.05 43.17 23.74 4149.40 131.58 1983 24.37 72.83 219.54 275.42 453.33 527.29 779.03 634.30 240.69 131.73 124.90 61.19 3544.62 112.40 1984 72.37 228.39 283.02 426.92 226.26 311.77 706.96 300.21 795.66 429.95 123.16 112.43 4017.10 127.38 1985 77.13 276.91 347.46 152.33 180.92 348.36 739.73 623.25 350.77 144.10 56.45 38.16 3335.57 105.77 1986 38.60 192.40 180.80 366.50 593.60 1071.10 1192.10 846.80 461.00 161.00 77.20 57.40 5238.50 166.11 1987 40.98 87.43 167.94 59.77 377.41 382.76 464.12 585.95 847.87 210.84 96.32 55.94 3377.33 107.09 1988 63.30 176.10 72.50 354.10 347.10 704.00 749.50 1416.10 668.20 192.00 82.60 63.60 4889.10 155.03 1989 72.61 139.13 140.02 215.02 309.34 410.51 752.13 551.03 115.70 56.84 33.14 32.39 2827.86 89.67 1990 47.20 86.50 123.10 89.60 187.30 202.50 436.90 709.70 376.30 119.20 63.20 61.50 2503.00 79.37 1991 34.16 103.82 248.95 327.03 516.36 708.06 618.98 437.73 272.33 216.25 70.60 43.01 3597.28 114.07 1992 27.29 51.48 52.88 48.06 232.06 339.59 608.74 611.23 190.37 88.72 43.61 41.29 2335.32 74.05 1993 56.00 67.40 71.60 203.00 209.00 477.10 848.70 625.20 1144.90 452.60 124.60 119.90 4400.00 139.52 1994 106.04 243.62 227.86 226.36 452.28 821.62 786.31 589.85 512.00 163.95 75.55 52.30 4257.74 135.01 1995 43.24 34.09 72.74 88.70 437.49 703.10 581.25 821.75 504.87 125.65 92.72 45.84 3551.44 112.62 1996 76.30 127.93 188.31 254.42 298.30 483.75 603.90 621.34 813.36 198.51 110.69 67.49 3844.30 121.90 1997 48.00 47.90 73.70 258.00 578.60 1005.70 908.30 630.10 354.30 107.80 44.30 26.60 4083.30 129.48 1998 28.20 29.50 100.00 204.70 435.50 771.50 1028.40 882.90 673.80 280.10 279.40 233.60 4947.60 156.89 1999 414.99 293.98 417.26 330.59 261.97 477.94 702.00 925.76 419.63 128.87 114.55 190.08 4677.62 148.33 2000 319.59 536.01 590.59 398.76 459.24 439.58 727.57 856.40 728.15 567.64 272.75 250.41 6146.69 194.91 2001 204.16 464.95 319.18 441.26 335.48 460.12 776.26 801.95 300.74 126.40 51.88 51.57 4333.95 137.43 2002 47.90 84.87 41.44 74.87 144.47 296.73 634.88 677.08 310.64 265.04 55.89 36.73 2670.54 84.68 2003 48.39 61.80 73.93 188.53 294.13 399.65 745.38 - 613.60 196.65 89.07 64.94 2776.07 88.03 2004 59.44 76.92 134.59 212.27 335.91 402.16 778.29 292.38 132.41 81.82 54.58 53.81 2614.58 82.91 2005 26.23 40.97 187.03 151.18 114.39 123.25 421.26 559.59 1098.08 465.25 277.56 114.53 3579.32 113.50 2006 - 487.21 567.54 794.29 479.25 534.39 825.07 345.01 165.33 90.85 - 49.00 4337.94 137.56 Average 75.83 154.71 210.69 290.91 349.23 473.63 671.81 675.54 494.60 239.35 93.37 71.58 3758.20 119.17 max 414.99 536.01 590.59 825.89 691.10 1071.10 1192.10 1416.10 1144.90 2166.70 279.40 250.41 6146.69 194.91 min 24.37 29.50 41.44 48.06 84.49 58.70 256.06 292.38 115.70 56.84 33.14 23.74 2014.52 63.88 STDEV 78.95 126.21 143.85 199.70 161.81 227.51 176.85 225.10 254.37 340.72 65.26 52.08 1011.04 32.06 April 75.83
- 2. May 154.71 June 210.69 July 290.91 August 349.23 800.00 September 473.63 October 671.81 November 675.54 700.00 December 494.60 January 239.35 February 93.37 March 600.0071.58 500.00 Q Runoff 400.00 300.00 200.00 100.00 0.00 April May June July August September October November December January February March Month
- 3. The relationship between basin area and average annual runoff. Watershead Area Water Runoff Code of station (square Kilomeater) (MCM.) The relationship between basin area and average annual X.53 233 299.53 runoff. X.64 957 578.15 10000 X.158 1819 1585.87 5046.7 4634.71 3825.71 3654.11 X.36 3012 3654.11 1585.87 X.38 2690 4634.71 1000 777.97 578.15 X.39 1437 297.24 299.53 297.24 X.57 8 24.92 189.65 135.91 115.34 Area 100 85.09 X.58 312 777.97 X.99 62 85.09 24.92 X.103 180 115.34 10 y = 0.997x + 32.891 X.106 309 135.91 R² = 0.8227 X.37A 5200 3825.71 1 X.6B 4415 5046.7 1 10 100 1000 10000 Runoff X.81A 220 189.65