text: Anda di halaman 1dari 3
  
  # Assignment
  
  Problem 1
  The names and locations of the rain gauge stations with their mean annual precipitation are as
  given in the table below. Calculate average precipitation of the catchment area by Isohyetal
  method.
  Name of
  Station
  
  Latitude
  Degrees
  
  Minutes
  
  Longitude
  Degrees
  Minutes
  
  Mean Annual
  Precipitation
  (in)
  
  A
  B
  C
  D
  E
  F
  G
  H
  I
  J
  K
  L
  
  16
  16
  14
  17
  17
  17
  14
  16
  15
  17
  15
  16
  
  03
  35
  58
  25
  27
  10
  53
  25
  15
  26
  45
  26
  
  103
  104
  102
  104
  101
  104
  103
  101
  104
  102
  102
  102
  
  04
  44
  07
  50
  44
  09
  29
  08
  53
  46
  02
  51
  
  39.85
  56.58
  45.73
  85.12
  47.51
  70.59
  52.67
  50.83
  60.57
  56.22
  41.50
  46.81
  
  Latitude and Longitude of the Catchment Area are 140 30 to 180 30 and 1010 00 to 1040
  00, respectively.
  Problem 2
  Assuming the rain falling vertically, express the catch of a gauge inclined 15 from the vertical
  as a percentage of the catch of a gauge installed vertically.
  Problem 3
  A 3-hour storm occurred at a place and the precipitation in the neighboring rain-gage stations P,
  Q and R were measured as 3.8, 4.1 and 4.5 cm respectively. The precipitation in the neighboring
  station S could not be measured since the rain gauge was damaged. The normal annual
  precipitation in the four stations P, Q, R and S were 45, 48, 53 and 50 cm, respectively. Estimate
  the storm precipitation at station S.
  Problem 4
  In a catchment one precipitation station A, was inoperative for part of a month during which
  storm occurred. The respective storm totals at three surrounding stations 1, 2 and 3 are 35, 40
  and 30 mm, respectively. The normal annual precipitations at A, 1, 2 & 3 are respectively 985,
  1125, 940 and 1210 mm. Estimate the storm precipitation for Station A.
  
  Problem 5
  The average annual precipitation for the four sub-basins constituting a large river basin is 58, 67,
  85 and 80 cm. The sub-basin areas are 900, 690, 1050 and 1650 km, respectively. What is the
  average annual precipitation for the basin as a whole?
  Problem 6
  The annual precipitation at station A and the
  15 surrounding stations are given in the Table 3.19 given below:
  a. Determine the consistency of the record at station A.
  
  average
  
  precipitation
  
  at
  
  ## b. In which year, there is a regime change indicated?
  
  Table 3.19 Data Table
  Year
  
  1971
  1972
  1973
  1974
  1975
  1976
  1977
  1978
  1979
  1980
  
  Annual Precipitation
  Station A
  15 Station
  (cm)
  Average (cm)
  
  50.5
  90.0
  16.0
  21.5
  50.5
  62.5
  69.5
  36.0
  42.0
  42.0
  
  71.5
  57.0
  27.5
  25.0
  60.0
  22.0
  55.0
  57.0
  36.5
  19.5
  
  Year
  
  1981
  1982
  1983
  1984
  1985
  1986
  1987
  1988
  1989
  1990
  
  Annual Precipitation
  Station A
  15 Station
  (cm)
  Average (cm)
  
  36.0
  42.0
  18.0
  30.0
  54.0
  48.0
  12.0
  36.0
  42.0
  36.0
  
  27.5
  60.5
  55.0
  38.5
  38.5
  47.5
  49.5
  24.0
  44.0
  60.5
  
  Problem 7
  The Table 3.20 given below gives the annual rainfall at a station A and the average annual
  rainfall of 10 stations in the vicinity for a period of 17 years. It is suspected that there has been a
  change in the location of the rain gauge at Station A during the period of this record. Determine
  the year when this change occurred and the corrected rain gauge readings prior to this year.
  
  ## Table 3.20 Rainfall Data
  
  Rainfall
  Year
  
  Station A
  (mm)
  
  Average
  Annual
  Rainfall of 10
  Stations (mm)
  
  1931
  1932
  1933
  1934
  1935
  1936
  1937
  1938
  1939
  1940
  
  505
  900
  60
  215
  505
  625
  695
  360
  420
  360
  
  615
  570
  275
  250
  605
  220
  550
  570
  365
  275
  
  Year
  
  Rainfall
  Average
  Station A
  Annual
  (mm)
  Rainfall of 10
  Stations (mm)
  
  1941
  1942
  1943
  1944
  1945
  1946
  1947
  
  420
  180
  300
  540
  480
  120
  360
  
  605
  550
  385
  385
  475
  495
  240
  
  Problem 8
  Point rainfalls due to a storm at several rain-gauge stations in a basin are shown in Fig. 3.16.
  Determine the mean areal depth of rainfall over the basin.
  
  8 cm
  
  6 cm
  zone
  Area(km)
  I
  410
  II
  900
  III
  2850
  IV
  1750
  V
  720
  VI
  550
  Area of the Basin = 7180 km
  
  8 cm
  zone I
  
  N (9.2)
  
  zone VI
  
  O (7.4 cm)
  
  D (9.2)
  G (8.5)
  
  A (8.6)
  
  L (5.2)
  
  C (10.8)
  M (5.6)
  H (10.5)
  E (13.8)
  
  K (7.8)
  
  B (7.6)
  F (10.4)
  
  I (11.2)
  J (9.5)
  zone II
  
  10 cm
  zone V
  zone IV
  
  zone III
metadata: {"found_math": false, "script_math_tex": 0, "script_math_asciimath": 0, "math_annotations": 0, "math_alttext": 0, "mathml": 0, "mathjax_tag": 0, "mathjax_inline_tex": 0, "mathjax_display_tex": 0, "mathjax_asciimath": 0, "img_math": 0, "codecogs_latex": 0, "wp_latex": 0, "mimetex.cgi": 0, "/images/math/codecogs": 0, "mathtex.cgi": 0, "katex": 0, "math-container": 0, "wp-katex-eq": 0, "align": 0, "equation": 0, "x-ck12": 0, "texerror": 0}