Basic HTML Version
370
Location : on left bank at Ban Tha Ngam.
4,774
sq.km.
Changwat
Phitsanulok
Ban
Tha Ngam
NAN RIVER BASIN
Nan River at Ban Tha Ngam , Phitsanulok (N.22A)
Lat 16 - 59 - 33 N Long 100 - 19 - 31 E
Amphoe
Wat Bot
WATER YEAR : 2011
Drainge Area
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
Bench Mark
Location BM
Basis of Mean Daily Gage Height
Gage Reading Frequency
Zero Gage at Bottom
+52.936 m. (MSL.)
Type of Gage
Rating Operation
Period of Available Gage Records
2008 to date
-
2008 to date
Stable.
Overbank flow starts at elevation +49.590 m.(MSL.), records are channel flow only.
Records good. Stage-discharge relation defined by 20 discharge measurements made in 2011.
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
42.80
42.41
42.97
43.42
44.65
47.91
48.18
43.66
42.18
44.20
43.58
43.67
2
42.77
42.00
42.91
43.57
44.13
48.32
48.00
43.23
41.92
44.13
43.60
42.63
3
42.72
42.01
42.90
43.50
44.87
48.32
48.03
43.08
42.02
44.13
43.61
42.87
4
42.76
41.83
42.88
43.48
44.92
48.26
48.52
42.88
41.88
44.17
43.63
42.48
5
42.78
41.96
42.84
43.44
45.01
48.29
48.67
42.54
41.88
44.12
43.60
42.33
6
42.78
41.94
42.90
43.43
45.00
48.04
48.66
42.80
42.05
44.09
43.62
42.18
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Gage Height in Meter (MSL.) Water Year April 1, 2011 to March 31, 2012
7
42.86
42.15
42.83
43.43
44.75
47.00
48.72
42.86
42.63
44.06
43.61
42.14
8
43.02
42.13
42.67
43.63
45.17
46.37
48.67
42.69
43.19
44.02
43.61
41.96
9
43.55
41.96
42.65
43.66
45.33
47.62
48.56
43.18
43.00
43.93
43.63
42.23
10
43.55
42.01
42.70
43.67
45.46
48.10
48.48
42.51
43.06
43.88
43.67
41.96
11
43.63
42.05
42.69
43.66
45.70
47.65
47.67
42.25
43.04
44.00
43.66
41.98
12
42.96
42.00
42.77
43.65
46.08
47.46
47.01
42.44
43.06
43.96
43.64
42.06
13
43.21
41.94
42.80
43.71
45.96
48.24
46.94
42.35
43.07
43.93
43.61
41.93
14
43.69
42.74
43.25
43.86
45.55
48.95
46.61
42.33
43.32
43.87
43.49
41.93
15
43.32
43.14
43.18
43.74
45.95
49.01
47.28
42.29
43.45
43.85
43.46
42.03
16
43.18
43.26
43.04
43.83
45.86
49.01
47.08
42.21
44.17
43.82
43.56
42.12
17
43.16
43.23
43.31
44.05
46.38
49.42
46.63
42.48
43.65
43.78
43.54
41.93
18
42.30
43.12
43.46
44.06
47.29
49.79
46.40
42.33
43.40
43.84
43.49
42.05
19
43.38
43.18
43.46
43.99
47.38
49.94
46.44
42.26
42.62
43.85
43.48
41.98
20
42.26
42.40
43.41
43.50
46.95
49.93
46.30
42.25
43.25
43.60
43.49
42.08
21
42.01
42.68
43.41
43.05
46.89
49.92
45.99
42.25
43.32
43.72
43.44
42.05
22
42.30
42.52
43.41
42.43
47.78
49.92
44.64
42.20
43.29
43.80
43.43
41.96
23
42.26
42.43
43.41
42.23
47.78
49.86
44.53
42.17
43.24
43.60
43.43
42.04
24
42.23
42.36
43.39
42.15
47.77
49.62
43.08
42.14
43.29
43.69
43.41
41.98
25
42.50
42.42
43.37
42.15
47.95
49.30
42.91
42.13
43.27
43.59
43.32
42.03
26
42.25
42.76
43.42
42.17
48.28
49.12
43.08
42.07
43.26
43.20
43.49
41.99
27
41.83
42.83
43.44
42.52
48.52
49.23
43.03
41.98
43.68
43.82
43.37
41.97
28
41.11
42.90
43.42
42.92
48.35
49.32
42.98
41.97
44.22
43.91
43.28
41.93
29
41.76
42.82
43.38
43.01
47.90
49.18
42.93
41.88
44.19
43.62
43.25
41.93
30
42.50
43.22
43.40
43.08
47.82
48.63
42.94
41.88
44.15
43.62
41.93
31
43.50
43.13
47.61
42.96
44.11
43.59
41.93
----------
--------------
Mean
42.71
42.51
43.12
43.29
46.42
48.72
46.19
42.44
43.12
43.85
43.52
42.14
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Max
43.69
43.50
43.46
44.06
48.52
49.94
48.72
43.66
44.22
44.20
43.67
43.67
49.94
Min
41.11
41.83
42.65
42.15
44.13
46.37
42.91
41.88
41.88
43.20
43.25
41.93
41.11
49.95
m. (MSL.) ,
41.63
m. (MSL.) ,
River Bed 40.18
m. (MSL)
50.18
m. (MSL.) ,
49.58
m. (MSL.) ,
Drainage Area 4774 Square Kilometers
at 19.00 Hours , on Sep 19 , 2011
Annual Max Momentary Gage Height
Zero Gage at Bottom Elevation
Left Bank Elevation
Right Bank Elevation