Basic HTML Version
366
Location : on left bank at Ban Tha Ngam.
4,774
sq.km.
Drainge Area
WATER YEAR : 2014
NAN RIVER BASIN
Khwae Noi River at Ban Tha Ngam , Phitsanulok (N.22A)
Lat 16 - 59 - 33 N Long 100 - 19 - 31 E
Amphoe
Wat Bot
Changwat
Phitsanulok
Ban
Tha Ngam
Staff gage
+41.630 m. (MSL.)
B.M.-H.D.
Near the gage site.
Elevation
5-time daily readings at 06.00, 09.00, 12.00, 15.00 and 18.00 hours.
Arithmetic means of 5 readings
2008 to date
Rating Operation
Period of Available Gage Records
Location BM
Basis of Mean Daily Gage Height
Gage Reading Frequency
Zero Gage at Bottom
+52.936 m. (MSL.)
Bench Mark
Type of Gage
2008 to date
-
2008 to date
Fairly stable because of backwater effect.
No overbank flow.
Records good. Stage-discharge relation defined by 31 discharge measurements made in 2014.
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
42.25
42.25
42.41
42.68
42.17
42.56
42.33
42.75
42.98
43.12
43.09
42.97
2
42.22
42.27
42.43
42.38
42.41
43.67
42.04
42.69
42.87
43.03
42.93
42.96
3
42.31
42.26
42.03
42.40
42.28
43.23
42.83
42.74
42.91
42.99
43.13
42.76
4
42.17
42.23
42.01
42.42
42.03
43.11
42.10
42.78
42.94
43.03
43.03
42.80
5
42.37
42.25
42.00
42.32
42.19
42.51
42.62
42.71
42.97
43.03
42.68
42.83
6
42.20
42.25
42.30
41.66
42.23
42.29
42.68
42.95
43.00
43.06
42.85
42.82
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Gage Height in Meter (MSL.) Water Year April 1, 2014 to March 31, 2015
7
42.06
42.20
42.43
41.91
42.51
42.04
42.56
42.76
42.98
43.07
42.68
42.80
8
41.97
42.21
42.31
42.42
42.73
41.72
42.59
42.86
42.88
43.00
42.61
42.81
9
41.94
42.36
42.48
42.19
42.31
41.60
42.64
43.05
42.91
42.97
42.55
42.82
10
42.20
42.40
42.38
42.06
42.49
41.63
42.63
43.01
42.94
43.03
42.49
42.74
11
42.57
42.45
42.02
42.41
41.99
41.63
42.62
42.98
43.02
43.09
42.58
42.71
12
42.74
43.04
42.11
42.33
42.28
41.60
42.80
42.98
42.86
43.03
42.70
42.71
13
42.68
42.90
42.24
42.16
41.98
41.73
42.79
42.82
42.94
42.80
42.72
42.72
14
42.37
42.77
42.26
41.96
42.14
41.93
42.85
42.79
42.94
42.77
42.74
42.71
15
42.40
42.18
42.19
42.36
42.29
42.13
42.77
42.46
43.02
42.88
42.81
42.68
16
42.44
42.23
42.15
42.46
43.26
42.13
42.69
42.80
43.01
42.83
42.88
42.65
17
42.69
42.22
42.37
42.13
42.90
41.98
42.63
43.00
43.03
42.81
42.95
42.64
18
42.74
42.32
42.28
42.23
42.26
41.91
42.78
42.93
43.03
42.80
42.96
42.67
19
42.81
42.58
42.20
42.13
42.57
42.09
42.62
42.90
42.97
42.84
42.95
42.68
20
42.77
42.57
42.10
42.03
42.09
42.01
42.57
42.95
42.97
42.82
42.93
42.67
21
42.66
42.31
42.26
42.13
42.20
41.99
42.56
42.86
43.12
42.90
42.92
42.68
22
42.61
42.28
42.27
42.05
42.75
42.05
42.55
43.06
42.98
42.83
42.93
42.71
23
42.57
42.46
42.21
42.08
41.98
41.96
42.92
42.98
42.93
42.83
42.96
42.60
24
42.51
42.40
42.11
42.01
42.09
41.85
43.17
42.96
42.96
42.89
42.95
42.92
25
42.37
42.21
42.14
42.08
42.01
42.30
44.46
42.90
43.01
42.83
42.97
42.61
26
42.27
42.55
42.16
42.29
42.01
41.91
42.83
42.87
43.39
42.83
42.99
42.50
27
42.27
42.28
42.23
42.07
42.26
42.00
42.81
42.99
43.31
42.90
42.98
42.96
28
42.39
42.36
42.16
42.34
42.65
41.89
42.65
42.88
43.23
42.83
42.97
42.93
29
42.50
42.37
42.17
42.33
42.32
41.99
42.73
42.90
43.23
42.83
42.58
30
42.40
42.19
42.19
42.16
42.92
42.16
42.61
42.96
43.19
43.03
42.56
31
42.38
42.00
42.98
42.77
42.95
43.18
42.19
----------
--------------
Mean
42.42
42.38
42.22
42.20
42.36
42.12
42.72
42.88
43.02
42.93
42.85
42.72
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Max
42.81
43.04
42.48
42.68
43.26
43.67
44.46
43.06
43.39
43.18
43.13
42.97
44.46
Min
41.94
42.18
42.00
41.66
41.98
41.60
42.04
42.46
42.86
42.77
42.49
42.19
41.60
44.73
m. (MSL.) ,
41.63
m. (MSL.) ,
River Bed 39.29
m. (MSL.)
52.77
m. (MSL.) ,
52.77
m. (MSL.) ,
Drainage Area 4774 Square Kilometers
at 06.00 Hours , on Oct 25 , 2014
Annual Max Momentary Gage Height
Zero Gage at Bottom Elevation
Left Bank Elevation
Right Bank Elevation