Basic HTML Version
364
Location : on right bank about 2 kilometers upstream from Station N.13
8,706
sq.km.
Drainge Area
WATER YEAR : 2011
NAN RIVER BASIN
Nan River at Ban Bun Nak , Nan (N.13A)
Lat 18 - 33 - 12 N Long 100 - 46 - 03 E
Amphoe
Wiang Sa
Changwat
Nan
Ban
Bun Nak
Staff gage.
+177.400 m. (MSL.)
B.M.-H.D.
On right bank at the abutment of the bridge.
Elevation
3-time daily readings at 06.00, 12.00 and 18.00 hours.
Arithmetic means of 3 readings
1987 to date
Rating Operation
Period of Available Gage Records
Location BM
Basis of Mean Daily Gage Height
Gage Reading Frequency
Zero Gage at Bottom
+192.700 m. (MSL.)
Bench Mark
Type of Gage
1987 to date
-
1987 to date
Fairly Stable because of backwater effect.
No overbank flow.
Records good. Stage-discharge relation defined by 48 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
177.94
178.28
178.87
182.30
184.74
181.18
181.27
179.14
178.39
178.15
178.03
177.90
2
177.93
178.58
178.72
182.19
184.21
181.89
182.35
179.00
178.38
178.14
178.03
177.90
3
177.92
178.33
178.61
181.33
183.82
180.93
181.87
178.93
178.37
178.14
178.05
177.89
4
177.91
178.42
178.73
180.87
182.87
180.60
181.23
178.89
178.37
178.12
178.03
177.89
5
177.90
178.73
178.72
180.56
182.00
181.87
180.79
178.91
178.36
178.12
178.03
177.88
6
177.91
178.53
178.76
180.16
181.37
183.15
180.49
178.86
178.33
178.13
178.02
177.88
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Gage Height in Meter (MSL.) Water Year April 1, 2011 to March 31, 2012
7
177.90
178.93
180.37
179.89
182.43
182.57
180.28
178.80
178.31
178.12
178.00
177.88
8
178.09
178.59
179.49
179.55
183.80
182.84
180.19
178.78
178.30
178.11
177.99
177.87
9
178.17
178.42
179.16
179.67
182.86
183.33
180.12
178.76
178.30
178.09
177.99
177.87
10
178.03
178.37
179.06
180.22
182.53
182.59
180.03
178.89
178.30
178.10
177.98
177.87
11
178.08
178.83
178.81
181.33
183.30
181.76
179.94
178.85
178.30
178.09
177.97
177.91
12
178.07
179.13
178.66
180.72
183.66
181.32
179.74
178.74
178.30
178.09
177.96
177.92
13
178.01
178.63
178.87
180.10
182.92
181.19
179.75
178.69
178.29
178.09
177.97
177.90
14
177.96
178.57
178.80
182.48
182.28
181.07
179.70
178.67
178.27
178.10
177.98
177.88
15
177.94
178.60
178.65
184.34
181.72
181.17
179.82
178.64
178.26
178.10
177.96
177.89
16
177.92
178.63
178.57
184.78
181.31
181.56
179.73
178.61
178.25
178.09
177.97
177.96
17
177.91
178.88
178.51
184.99
181.69
181.74
179.74
178.60
178.24
178.09
177.96
178.01
18
177.90
179.50
178.48
184.48
182.98
181.62
179.57
178.58
178.24
178.10
177.96
177.94
19
177.89
179.60
178.47
182.43
182.19
183.54
179.52
178.57
178.23
178.08
177.95
177.89
20
177.88
179.76
178.51
181.93
184.25
183.37
179.35
178.55
178.23
178.08
177.95
177.88
21
177.88
179.54
178.53
182.46
185.29
183.00
179.28
178.53
178.22
178.06
177.93
177.85
22
177.87
179.29
178.51
182.08
185.38
183.56
179.22
178.51
178.20
178.05
177.93
177.84
23
177.86
178.84
178.46
181.94
184.86
182.53
179.17
178.49
178.19
178.04
177.92
177.84
24
177.95
178.61
178.39
181.55
183.82
182.23
179.12
178.49
178.19
178.04
177.91
177.83
25
178.15
178.81
178.90
182.37
182.75
181.65
179.06
178.48
178.18
178.03
177.91
177.82
26
178.35
179.33
185.93
181.41
182.89
181.49
179.04
178.46
178.17
178.03
177.91
177.81
27
178.10
179.02
187.80
180.88
182.41
181.85
179.02
178.44
178.15
178.03
177.90
177.81
28
177.99
178.85
187.61
181.10
182.59
181.41
179.01
178.43
178.15
178.02
177.90
177.81
29
177.97
179.19
186.84
181.22
182.09
181.14
178.97
178.42
178.16
178.02
177.89
177.81
30
178.07
179.06
184.53
180.49
181.32
180.89
179.00
178.41
178.16
178.01
177.82
31
179.05
183.77
181.52
179.29
178.15
178.01
177.84
----------
--------------
Mean
177.98
178.87
180.08
181.73
182.96
181.97
179.86
178.67
178.26
178.08
177.96
177.87
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Max
178.35
179.76
187.80
184.99
185.38
183.56
182.35
179.14
178.39
178.15
178.05
178.01
187.80
Min
177.86
178.28
178.39
179.55
181.31
180.60
178.97
178.41
178.15
178.01
177.89
177.81
177.81
187.87
m. (MSL.) ,
177.40
m. (MSL.) ,
River Bed 174.72
m. (MSL)
190.28
m. (MSL.) ,
192.58
m. (MSL.) ,
Drainage Area 8706 Square Kilometers
at 03.00 Hours , on Jun 27 , 2011
Annual Max Momentary Gage Height
Zero Gage at Bottom Elevation
Left Bank Elevation
Right Bank Elevation