Basic HTML Version
642
Location : on left bank at Ban Tha Pho.
488
sq.km.
Drainge Area
WATER YEAR : 2011
TAPI RIVER BASIN
Tapi River at Ban Tha Pho , Nakhon Si Thammarat (X.195)
Lat 08 - 30 - 24 N Long 99 - 30 - 39 E
Amphoe
Chawang
Changwat
Nakhon Si Thammarat
Ban
Tha Pho
Water - stage recorder
+0.000 m. (MSL.)
B.M.-H.D.
Near the top staff gage.
Elevation
Recording
Arithmetic means of 24 readings
1998 - 2006, 2011 to date
Rating Operation
Period of Available Gage Records
Location BM
Basis of Mean Daily Gage Height
Gage Reading Frequency
Zero Gage at Bottom
+40.509 m. (MSL.)
Bench Mark
Type of Gage
1998 - 2006, 2011 to date
-
1998 - 2006, 2011 to date
Fairly stable.
No overbank flow.
Records fair. Stage-discharge relation defined by 26 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
38.16
34.33
34.20
34.01
34.06
34.25
34.63
34.13
34.26
34.32
34.73
33.84
2
37.27
34.32
34.24
34.00
33.99
34.29
34.51
34.05
34.42
36.11
34.41
33.82
3
36.56
34.18
34.29
34.02
33.95
34.29
34.58
34.01
34.33
36.39
34.38
33.81
4
36.12
34.03
34.25
34.00
33.90
34.26
34.51
33.98
34.38
35.68
34.29
33.80
5
35.81
34.08
34.22
33.98
33.85
34.25
34.54
33.98
34.37
35.13
34.25
33.87
6
35.63
34.11
34.18
33.98
33.83
34.25
34.49
33.92
34.27
34.91
34.22
33.87
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Gage Height in Meter (MSL.) Water Year April 1, 2011 to March 31, 2012
7
35.50
34.16
34.16
33.96
33.85
34.25
34.44
33.80
34.16
34.78
34.19
33.85
8
35.32
34.09
34.15
33.96
33.85
34.28
34.27
33.80
34.10
34.70
34.17
33.87
9
35.16
34.09
34.16
33.95
33.85
34.29
34.19
33.86
34.06
34.60
34.15
33.99
10
35.04
34.16
34.20
33.95
33.85
34.11
34.12
33.90
34.23
34.50
34.13
33.87
11
34.90
34.15
34.29
33.96
33.90
34.31
34.23
33.77
34.47
34.46
34.12
33.88
12
34.80
34.15
34.26
34.00
33.85
34.66
34.47
33.75
34.35
34.47
34.10
33.90
13
34.75
34.09
34.29
34.10
33.82
34.62
34.47
33.73
34.18
34.65
34.11
33.87
14
34.71
34.12
34.24
34.26
33.80
34.49
34.42
33.91
34.09
34.61
34.09
33.83
15
34.67
34.10
34.19
34.22
33.80
34.47
34.36
33.80
34.06
35.71
34.07
33.81
16
34.67
34.09
34.18
34.21
33.80
34.37
34.30
33.80
34.69
35.21
34.06
33.79
17
34.64
34.22
34.18
34.11
33.80
34.20
34.21
33.80
34.89
34.98
34.02
33.78
18
34.62
34.16
34.25
34.05
33.80
34.15
34.14
33.80
34.76
34.80
33.93
33.78
19
34.66
34.30
34.31
33.96
33.88
34.12
34.13
33.77
34.64
34.67
34.19
33.84
20
34.68
34.22
34.22
33.95
33.87
34.14
34.12
33.75
34.46
34.63
34.11
33.81
21
34.57
34.34
34.17
33.95
33.93
34.21
34.08
33.82
34.35
34.77
33.98
33.81
22
34.53
34.27
34.13
33.95
33.95
34.33
34.04
34.48
34.41
34.55
33.93
33.77
23
34.49
34.20
34.11
33.95
34.22
34.28
33.99
35.02
34.53
34.42
33.91
33.77
24
34.46
34.16
34.12
33.97
34.06
34.34
33.98
34.79
34.45
34.35
33.89
33.75
25
34.41
34.14
34.10
33.97
34.04
34.27
33.98
35.57
34.87
34.30
33.87
33.74
26
34.37
34.19
34.07
33.96
34.48
34.23
34.15
35.67
34.82
34.26
33.86
33.72
27
34.37
34.13
34.06
33.99
34.26
34.40
34.23
35.31
34.51
34.23
33.85
33.65
28
34.36
34.15
34.05
34.08
34.41
34.55
34.14
34.96
34.35
34.19
33.84
33.63
29
34.35
34.12
34.03
34.17
34.37
34.61
34.14
34.70
34.26
34.17
33.84
33.60
30
34.34
34.13
34.02
34.22
34.36
34.81
34.29
34.45
34.21
34.23
33.45
31
34.16
34.08
34.31
34.25
34.17
34.43
33.45
----------
--------------
Mean
35.06
34.17
34.18
34.03
33.99
34.34
34.27
34.20
34.39
34.75
34.09
33.78
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Max
38.16
34.34
34.31
34.26
34.48
34.81
34.63
35.67
34.89
36.39
34.73
33.99
38.16
Min
34.34
34.03
34.02
33.95
33.80
34.11
33.98
33.73
34.06
34.17
33.84
33.45
33.45
38.50
m. (MSL.) ,
0.00
m. (MSL.) ,
River Bed 32.35
m. (MSL)
40.75
m. (MSL.) ,
40.78
m. (MSL.) ,
Drainage Area 488 Square Kilometers
at 01.00 Hours , on Apr 1 , 2011
Annual Max Momentary Gage Height
Zero Gage at Bottom Elevation
Left Bank Elevation
Right Bank Elevation