Basic HTML Version
638
Location : on left bank at Ban Tha Khanon.
2,968
sq.km.
Drainge Area
WATER YEAR : 2011
TAPI RIVER BASIN
Khlong Phum Duang at Ban Tha Khanon , Surat Thani (X.36)
Lat 09 - 01 - 44 N Long 98 - 58 - 00 E
Amphoe
Khiri Ratnikhom
Changwat
Surat Thani
Ban
Tha Khanon
Staff gage
+0.000 m. (MSL.)
B.M.-H.D.
On left bank near the sixth staff gage.
Elevation
5-time daily readings at 06.00, 09.00, 12.00, 15.00 and 18.00 hours.
Arithmetic means of 5 readings
1963 to date
Rating Operation
Period of Available Gage Records
Location BM
Basis of Mean Daily Gage Height
Gage Reading Frequency
Zero Gage at Bottom
+10.520 m. (MSL.)
Bench Mark
Type of Gage
1989 to date
-
1989 to date
Stable.
Overbank flow starts at elevation +12.110 m.(MSL.),records are channel flow only.
Records good. Flow regulated by Ratcha Prapha Dam.
Stage-discharge relation defined by 25 discharge measurements made in 2011.
Period of Rating
Rated by Flot
Rated by Current Meter
Stability of Channel Regimes
Overbank Flow Conditions
General Description
Date
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Annual
----------
-----------------
1
13.06
2.05
3.39
3.48
3.25
6.05
4.56
2.65
2.04
2.06
2.09
3.08
2
11.98
2.43
3.01
3.55
2.75
4.86
5.06
2.61
2.62
3.37
1.92
2.65
3
9.37
2.30
4.06
3.55
2.68
4.42
4.96
2.54
3.12
6.05
1.84
3.08
4
6.75
2.79
3.23
2.54
2.98
4.19
5.07
2.74
3.46
5.23
2.36
2.81
5
5.14
1.93
3.31
2.83
2.98
3.56
5.80
2.69
3.03
5.28
2.07
1.76
6
5.00
1.89
3.19
3.68
2.90
4.18
5.97
2.56
2.83
5.25
1.92
3.35
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Gage Height in Meter (MSL.) Water Year April 1, 2011 to March 31, 2012
7
4.77
2.02
3.32
3.76
2.80
4.38
5.21
2.49
2.73
5.27
1.63
1.82
8
4.26
2.12
3.73
3.90
2.62
4.36
5.18
2.66
2.84
3.80
1.97
2.02
9
3.41
1.91
3.75
4.06
3.63
3.66
4.74
2.80
2.48
2.47
2.06
2.66
10
2.83
3.59
3.75
4.05
3.50
4.40
4.45
1.92
2.03
2.37
3.33
2.79
11
2.57
4.29
3.84
3.87
2.84
6.33
4.55
2.16
2.12
1.98
2.29
2.83
12
2.38
3.98
4.13
3.91
2.82
7.74
4.91
1.97
2.05
2.16
2.09
3.47
13
2.10
2.94
3.49
4.03
2.79
7.99
4.76
1.88
2.06
2.16
2.02
2.52
14
2.31
2.99
3.50
3.90
2.91
6.99
4.71
2.12
1.81
2.23
2.27
2.20
15
2.20
2.95
3.32
4.02
2.86
5.70
4.76
2.28
2.04
3.09
1.95
2.17
16
1.92
2.85
3.64
4.43
2.77
5.58
4.05
2.06
2.54
2.94
1.71
1.74
17
3.22
3.08
3.80
3.64
2.75
4.62
4.17
2.00
2.43
2.71
1.65
1.70
18
3.23
3.20
3.66
3.77
3.10
4.16
4.30
2.01
1.88
3.08
2.72
1.85
19
3.00
4.46
3.80
3.90
3.55
2.90
4.17
1.94
1.83
2.56
2.26
2.88
20
2.96
4.55
3.51
3.90
3.27
3.42
4.49
1.98
1.79
2.40
2.67
2.84
21
1.95
3.26
3.58
3.60
2.91
4.90
4.15
2.17
1.65
2.53
1.99
2.95
22
1.92
3.32
4.20
3.16
3.15
4.46
4.29
2.21
1.48
2.78
2.12
2.90
23
1.94
3.81
4.12
2.46
2.72
4.36
4.20
3.34
2.86
2.67
2.08
3.04
24
1.86
2.94
3.98
2.89
3.81
4.14
3.72
3.20
2.69
2.31
2.39
3.09
25
1.92
2.35
4.05
2.56
4.83
2.78
4.29
3.14
2.39
2.17
2.39
3.19
26
1.90
2.19
3.49
2.84
5.31
2.31
3.86
2.71
2.41
2.10
2.60
2.94
27
2.33
2.37
4.11
3.87
5.61
2.75
4.05
2.91
2.15
1.95
2.28
3.70
28
2.49
2.60
4.02
4.07
7.60
4.79
3.85
2.72
2.07
1.97
3.22
3.60
29
2.46
2.85
3.83
4.55
8.23
4.58
3.96
2.62
2.44
2.08
4.39
3.53
30
2.42
2.47
4.25
5.00
8.09
4.36
3.88
1.88
2.38
1.89
3.26
31
2.20
4.96
7.89
3.50
2.07
2.17
3.05
----------
--------------
Mean
3.79
2.86
3.70
3.70
3.87
4.63
4.50
2.43
2.33
2.94
2.29
2.76
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Max
13.06
4.55
4.25
5.00
8.23
7.99
5.97
3.34
3.46
6.05
4.39
3.70
13.06
Min
1.86
1.89
3.01
2.46
2.62
2.31
3.50
1.88
1.48
1.89
1.63
1.70
1.48
13.14
m. (MSL.) ,
0.00
m. (MSL.) ,
River Bed -0.95
m. (MSL)
12.10
m. (MSL.) ,
12.11
m. (MSL.) ,
Drainage Area 2968 Square Kilometers
at 03.00 Hours , on Apr 1 , 2011
Annual Max Momentary Gage Height
Zero Gage at Bottom Elevation
Left Bank Elevation
Right Bank Elevation