. Compute the average rainfall for a given watershed by the Thiessen method from the following data. How do weighted average and the station average compare? Rain Gage Area, ha (ac) 14.0 (34.60) 4.5 (11.20) 5.3 (13.20) 4.9 (12.1) Rainfall, mm (in.) 58 (2.30) 41 (1.60) 51 (2.02) 43 (1.71) A C

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9:18
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GElוווי
ABEN_4422_LWCE_PSO1_questi...
ABEN–1422– Land and Water Conservation Engineering
ABEN 4422 – Land and Water Conservation Engineering
Problem Set No. 1
2.4. Compute the average rainfall for a given watershed by the Thiessen method from the
following data. How do weighted average and the station average compare?
Rain Gage
Area, ha (ac)
14.0 (34.60)
4.5 (11.20)
5.3 (13.20)
4.9 (12.1)
Rainfall, mm (in.)
58 (2.30)
41 (1.60)
51 (2.02)
43 (1.71)
A
C
2.6. From the rainfall data presented on the table below, (a) calculate and plot the best
theoretical probability curve for the return periods of 2, 5, 20, and 100 years; (b) For 90%
chance of occurrence is the period adequate?
August
Total (mm)
No.
Year
Mean (mm)
1
1989
451.4
14.6
1990
462.8
14.9
3
1991
578.4
18.7
4
1992
505.3
16.3
5
1993
396.7
12.8
1994
261.1
8.4
7
1995
304.9
9.8
8
1996
257.6
8.3
9
1997
334.4
10.8
10
1998
265.4
8.6
11
1999
547.5
17.7
12
2000
405.5
13.1
13
2001
314.2
10.1
14
2002
297.1
9.6
15
2003
448.7
14.5
16
2004
621.6
20.1
17
2005
269.6
8.7
18
2006
390.2
12.6
19
2007
369.5
11.9
20
2008
330.7
10.7
21
2009
530.4
17.1
22
2010
307.1
9.9
23
2011
360.3
11.6
24
2012
552.3
17.8
25
2013
593.7
19.2
Problem Set No.1 | 1
ABEN_4422 – Land and Water Conservation Engineering
2.7. Plot the data in Problem 2.6 using the ASCE empirical equation for plotting positi
2.8. If the average rainfall intensity for 50 years of records is 50 mm/h (2.0 iph)
duration of 60 min and the coefficient of variation of the data is 0.324. Con
theoretical rainfall intensities for a return periods of 2, 5, 20, and 100 years. Assume that
Transcribed Image Text:9:18 3.00 KB/S GElוווי ABEN_4422_LWCE_PSO1_questi... ABEN–1422– Land and Water Conservation Engineering ABEN 4422 – Land and Water Conservation Engineering Problem Set No. 1 2.4. Compute the average rainfall for a given watershed by the Thiessen method from the following data. How do weighted average and the station average compare? Rain Gage Area, ha (ac) 14.0 (34.60) 4.5 (11.20) 5.3 (13.20) 4.9 (12.1) Rainfall, mm (in.) 58 (2.30) 41 (1.60) 51 (2.02) 43 (1.71) A C 2.6. From the rainfall data presented on the table below, (a) calculate and plot the best theoretical probability curve for the return periods of 2, 5, 20, and 100 years; (b) For 90% chance of occurrence is the period adequate? August Total (mm) No. Year Mean (mm) 1 1989 451.4 14.6 1990 462.8 14.9 3 1991 578.4 18.7 4 1992 505.3 16.3 5 1993 396.7 12.8 1994 261.1 8.4 7 1995 304.9 9.8 8 1996 257.6 8.3 9 1997 334.4 10.8 10 1998 265.4 8.6 11 1999 547.5 17.7 12 2000 405.5 13.1 13 2001 314.2 10.1 14 2002 297.1 9.6 15 2003 448.7 14.5 16 2004 621.6 20.1 17 2005 269.6 8.7 18 2006 390.2 12.6 19 2007 369.5 11.9 20 2008 330.7 10.7 21 2009 530.4 17.1 22 2010 307.1 9.9 23 2011 360.3 11.6 24 2012 552.3 17.8 25 2013 593.7 19.2 Problem Set No.1 | 1 ABEN_4422 – Land and Water Conservation Engineering 2.7. Plot the data in Problem 2.6 using the ASCE empirical equation for plotting positi 2.8. If the average rainfall intensity for 50 years of records is 50 mm/h (2.0 iph) duration of 60 min and the coefficient of variation of the data is 0.324. Con theoretical rainfall intensities for a return periods of 2, 5, 20, and 100 years. Assume that
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