Basic HTML Version
402
Location : on right bank at the bridge near Wat Koei Chai Nua
57,384 sq.km.
WATER YEAR : 2011
NAN RIVER BASIN
Nan River at Ban Koei Chai, Nakhon Sawan (N.67)
Lat 15 - 52 - 05 N Long 100 - 16 - 07 E
Amphoe
Chum Saeng
Changwat
Nakhon Sawan
Ban
Koei Chai
Drainge Area
Water - stage recorder
+0.000 m. (MSL.)
B.M.-H.D.
On right bank near the gage observe's house
Elevation
Recording
Arithmetic means of 24 readings
1997 to date
+27.470 m. (MSL.)
Bench Mark
Type of Gage
Rating Operation
Period of Available Gage Records
Location BM
Basis of Mean Daily Gage Height
Gage Reading Frequency
Zero Gage at Bottom
1997 to date
-
1997 to date
Fairly stable.
Overbank flow starts at elevation +28.340 m.(MSL.), records are channel flow only.
Records good. Flow effected by Mae Yom side flow.
Stage-discharge relation defined by 65 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
20.41
20.83
24.21
23.22
26.44
28.10
28.40
27.71
22.82
22.56
23.55
23.45
2
20.46
20.91
24.63
23.33
26.49
28.11
28.40
27.62
22.56
22.58
23.56
23.27
3
20.70
21.11
24.88
23.55
26.66
28.11
28.43
27.55
22.40
22.49
23.62
23.15
4
20.71
21.28
24.92
23.96
26.89
28.11
28.45
27.49
22.29
22.37
23.74
23.06
5
20.56
21.40
24.83
24.32
27.08
28.12
28.45
27.44
22.07
22.35
23.83
23.01
6
20.59
21.38
24.68
24.55
27.19
28.12
28.46
27.39
21.80
22.52
23.83
23.01
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Gage Height in Meter (MSL.) Water Year April 1, 2011 to March 31, 2012
7
20.48
21.55
24.68
24.56
27.26
28.13
28.47
27.33
21.50
22.76
23.78
23.03
8
20.19
22.14
24.87
24.36
27.27
28.13
28.48
27.25
21.23
23.00
23.74
22.99
9
19.86
22.58
25.10
24.06
27.29
28.13
28.48
27.15
21.20
23.22
23.67
22.99
10
19.64
22.64
25.25
23.68
27.32
28.13
28.48
27.09
21.47
23.36
23.64
22.95
11
19.57
22.48
25.27
23.38
27.36
28.14
28.48
27.04
21.59
23.17
23.58
22.97
12
19.72
22.27
25.16
23.29
27.42
28.15
28.49
26.94
21.54
22.83
23.66
23.10
13
19.97
21.87
24.91
23.33
27.48
28.16
28.49
26.81
21.39
22.62
23.71
23.19
14
20.12
21.81
24.57
23.42
27.54
28.19
28.48
26.70
21.27
22.59
23.75
23.21
15
20.18
21.83
24.18
23.67
27.60
28.22
28.47
26.58
21.54
22.61
23.83
23.17
16
20.64
22.10
23.80
24.08
27.64
28.23
28.44
26.47
21.93
22.60
23.75
23.14
17
20.97
22.60
23.60
24.61
27.66
28.25
28.41
26.32
22.21
22.66
23.72
23.10
18
21.02
23.01
23.41
24.93
27.72
28.26
28.38
26.14
22.38
22.64
23.78
22.99
19
20.98
23.12
23.43
25.33
27.84
28.29
28.35
26.01
22.34
22.56
23.87
22.59
20
20.94
23.12
23.60
25.60
27.85
28.33
28.32
25.87
22.26
22.66
23.92
22.22
21
20.86
23.17
23.73
25.78
27.88
28.34
28.29
25.71
22.04
22.87
23.93
21.74
22
20.86
23.25
23.77
25.96
27.93
28.35
28.26
25.47
21.97
22.97
23.91
21.36
23
20.78
23.22
23.74
26.08
27.93
28.36
28.23
25.18
22.03
23.03
23.88
21.15
24
20.56
23.07
23.66
26.18
27.93
28.37
28.20
24.92
22.08
23.11
23.80
20.83
25
20.24
22.79
23.55
26.25
27.94
28.38
28.15
24.60
22.17
23.13
23.73
20.59
26
20.10
22.50
23.37
26.30
27.97
28.38
28.11
24.25
22.20
23.10
23.72
20.48
27
20.34
22.37
23.11
26.35
28.00
28.39
28.06
23.95
22.10
23.11
23.68
20.47
28
20.63
22.47
22.90
26.39
28.03
28.42
28.00
23.64
22.01
23.13
23.67
20.43
29
20.81
22.77
22.87
26.41
28.06
28.43
27.92
23.35
22.14
23.22
23.62
20.38
30
20.80
23.27
23.08
26.42
28.08
28.41
27.85
23.09
22.35
23.36
20.43
31
23.80
26.42
28.09
27.78
22.56
23.47
20.31
----------
--------------
Mean
20.46
22.35
24.13
24.83
27.54
28.24
28.31
26.10
21.98
22.86
23.74
22.22
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Max
21.02
23.80
25.27
26.42
28.09
28.43
28.49
27.71
22.82
23.47
23.93
23.45
28.49
Min
19.57
20.83
22.87
23.22
26.44
28.10
27.78
23.09
21.20
22.35
23.55
20.31
19.57
28.49
m. (MSL.) ,
0.00
m. (MSL.) ,
River Bed 12.80
m. (MSL)
28.55
m. (MSL.) ,
28.33
m. (MSL.) ,
Drainage Area 57384 Square Kilometers
at 11.00 Hours , on Oct 12 , 2011
Annual Max Momentary Gage Height
Zero Gage at Bottom Elevation
Left Bank Elevation
Right Bank Elevation