Basic HTML Version
632
Location : on left bank at Ban Khian Sa.
6,697
sq.km.
WATER YEAR : 2012
TAPI RIVER BASIN
Tapi River at Ban Khian Sa , Surat Thani (X.217)
Lat 08 - 50 - 54 N Long 99 - 12 - 03 E
Drainge Area
Amphoe
Khian Sa
Changwat
Surat Thani
Ban
Khian Sa
Water - stage recorder
+0.000 m. (MSL.)
B.M.-H.D.
On left bank at the abutment of the bridge.
Elevation
Recording.
Arithmetic mean of 24 readings
2003 to date
Rating Operation
Period of Available Gage Records
Basis of Mean Daily Gage Height
Gage Reading Frequency
Zero Gage at Bottom
+9.801 m. (MSL.)
Type of Gage
Bench Mark
Location BM
2003 to date
-
2003 to date
Fairly stable because of backwater effect.
No overbank flow.
Records fair. Stage-discharge relation defined by 22 discharge measurements made in 2012.
Rated by Current Meter
Stability of Channel Regimes
Overbank Flow Conditions
General Description
Period of Rating
Rated by Flot
Date
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Annual
----------
-----------------
1
0.91
1.49
1.95
1.54
0.80
1.71
1.99
1.38
1.39
1.42
0.65
0.73
2
0.87
1.44
2.03
1.23
0.74
1.76
2.10
1.19
1.39
1.50
0.61
0.57
3
0.74
1.38
2.12
1.14
0.66
1.74
2.21
1.27
1.36
1.54
0.59
0.57
4
0.72
1.32
2.22
1.11
0.67
1.65
2.30
1.24
1.32
1.54
0.69
0.57
5
0.93
1.19
2.33
1.10
0.69
1.45
2.35
1.44
1.22
1.51
0.51
0.57
6
0.98
1.00
2.53
1.16
0.65
1.22
2.37
1.59
1.08
1.44
0.53
0.59
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Gage Height in Meter (MSL.) Water Year April 1, 2012 to March 31, 2013
7
1.04
1.12
2.76
1.32
0.59
1.19
2.33
1.49
0.97
1.47
0.50
0.62
8
1.07
1.33
2.98
1.42
0.51
1.26
2.26
1.60
0.87
1.49
0.53
0.64
9
1.15
1.45
3.22
1.50
0.47
1.33
2.19
1.57
0.83
1.46
0.60
0.61
10
1.11
1.53
3.47
1.59
0.53
1.32
2.14
1.59
0.80
1.39
0.62
0.49
11
0.95
1.57
3.75
1.66
0.55
1.24
2.07
1.60
0.85
1.32
0.69
0.37
12
0.91
1.51
4.17
1.72
0.54
1.13
2.03
1.68
1.00
1.27
0.64
0.45
13
1.03
1.35
4.46
1.76
0.44
1.13
2.00
1.71
1.19
1.22
0.77
0.41
14
1.00
1.09
4.58
1.72
0.40
1.32
1.97
1.64
1.28
1.18
0.68
0.34
15
0.97
0.88
4.57
1.83
0.46
1.53
1.96
1.63
1.27
1.15
0.57
0.47
16
0.89
0.66
4.47
1.79
0.47
1.70
1.95
1.68
1.30
1.07
0.57
0.48
17
0.88
0.64
4.33
1.70
0.48
1.82
1.95
1.75
1.40
0.96
0.67
0.44
18
0.89
0.73
4.18
1.49
0.45
1.90
1.93
1.40
1.45
0.92
0.55
0.35
19
0.85
0.85
4.02
1.37
0.58
1.94
1.95
1.44
1.46
1.03
0.43
0.31
20
1.07
0.93
3.90
1.28
0.55
1.94
2.02
1.47
1.41
0.86
0.46
0.29
21
1.39
0.81
3.66
1.21
0.48
1.89
2.03
1.36
1.22
0.64
0.54
0.23
22
1.54
0.83
3.52
1.09
0.47
1.78
1.90
1.27
1.00
0.79
0.56
0.25
23
1.63
0.72
3.34
0.93
0.47
1.65
1.83
1.21
1.03
0.76
0.48
0.29
24
1.72
0.75
3.16
0.81
0.66
1.55
1.76
1.15
1.28
0.77
0.68
0.24
25
1.79
0.76
2.99
0.74
0.85
1.49
1.74
1.23
1.49
0.73
0.65
0.21
26
1.84
0.88
2.75
0.75
1.08
1.47
1.74
1.37
1.54
0.75
0.68
0.32
27
1.86
1.19
2.46
0.86
1.25
1.49
1.65
1.33
1.58
0.75
0.61
0.31
28
1.82
1.44
2.19
0.90
1.36
1.55
1.54
1.25
1.61
0.72
0.65
0.30
29
1.74
1.61
1.94
0.86
1.44
1.72
1.54
1.28
1.56
0.74
0.33
30
1.62
1.75
1.53
0.78
1.56
1.87
1.51
1.33
1.45
0.67
0.39
31
1.86
0.80
1.65
1.45
1.40
0.66
0.44
----------
--------------
Mean
1.20
1.16
3.19
1.26
0.73
1.56
1.96
1.44
1.26
1.09
0.60
0.43
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Max
1.86
1.86
4.58
1.83
1.65
1.94
2.37
1.75
1.61
1.54
0.77
0.73
4.58
Min
0.72
0.64
1.53
0.74
0.40
1.13
1.45
1.15
0.80
0.64
0.43
0.21
0.21
4.59
m. (MSL.) ,
0.00
m. (MSL.) ,
River Bed -7.63
m. (MSL.)
9.94
m. (MSL.) ,
8.63
m. (MSL.) ,
Drainage Area 6697 Square Kilometers
at 19.00 Hours , on Jun 14 , 2012
Annual Max Momentary Gage Height
Zero Gage at Bottom Elevation
Right Bank Elevation
Left Bank Elevation