Basic HTML Version
318
Location : on right bank upstream of the bridge from Pong Sanuk - Chiang Muan road.
590
sq.km.
Drainge Area
WATER YEAR : 2011
YOM RIVER BASIN
Nam Pi at Ban Mang , Phayao (Y.24)
Lat 18 - 53 - 11 N Long 100 - 17 - 20 E
Amphoe
Chiang Muan
Changwat
Phayao
Ban
Mang
Staff gage
+257.765 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
1977 to date
Rating Operation
Period of Available Gage Records
Location BM
Basis of Mean Daily Gage Height
Gage Reading Frequency
Zero Gage at Bottom
+264.800 m. (MSL.)
Bench Mark
Type of Gage
1979 - 1986 , 1996 to date
-
1979 - 1986 , 1996 to date
Fairly stable because of backwater effect.
No overbank flow.
Records fair. The channel flow silted about 100 meters downstream from the gage site.
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
259.77
260.13
260.25
260.28
262.22
260.39
261.96
259.88
259.76
259.67
259.68
259.82
2
259.81
260.25
260.15
260.20
261.67
260.34
261.82
259.88
259.76
259.67
259.68
259.82
3
259.79
260.15
260.12
260.15
261.31
260.28
261.18
259.87
259.76
259.67
259.66
259.82
4
259.79
260.20
260.20
260.11
260.84
260.23
260.82
259.87
259.74
259.67
259.67
259.83
5
259.74
260.28
260.16
260.07
260.55
260.60
260.43
259.86
259.71
259.69
259.67
259.83
6
259.74
260.28
262.03
260.05
260.39
260.88
260.26
259.87
259.70
259.72
259.68
259.83
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Gage Height in Meter (MSL.) Water Year April 1, 2011 to March 31, 2012
7
259.74
260.37
260.75
260.04
260.34
260.78
260.23
259.87
259.70
259.71
259.67
259.84
8
259.70
260.30
260.43
260.00
260.36
260.61
260.26
259.86
259.68
259.71
259.66
259.83
9
259.68
260.16
260.19
259.94
260.27
260.65
260.23
259.86
259.68
259.69
259.62
259.82
10
259.68
260.51
260.15
259.92
260.22
260.57
260.20
259.88
259.69
259.68
259.62
259.82
11
260.06
260.98
260.08
260.58
261.83
260.51
260.16
259.86
259.68
259.67
259.57
259.82
12
260.02
260.43
259.99
260.20
261.38
260.41
260.11
259.86
259.69
259.66
259.57
259.82
13
260.07
260.12
259.98
260.09
260.86
260.34
260.04
259.86
259.69
259.65
259.58
259.83
14
260.02
260.09
259.95
260.04
260.54
260.38
260.06
259.86
259.70
259.66
259.57
259.85
15
260.00
260.22
259.93
260.20
260.40
260.28
260.06
259.85
259.72
259.65
259.57
259.87
16
259.95
260.22
259.92
260.47
260.32
260.26
259.88
259.85
259.75
259.63
259.57
259.86
17
259.90
260.33
259.90
260.39
262.03
260.21
260.06
259.84
259.72
259.62
259.57
259.87
18
259.86
260.68
259.88
260.22
261.41
259.94
260.06
259.84
259.71
259.62
259.57
259.84
19
259.88
261.41
259.87
260.21
261.41
259.93
260.05
259.83
259.70
259.62
259.56
259.84
20
259.92
261.07
259.86
260.15
262.10
260.30
260.01
259.82
259.70
259.62
259.53
259.84
21
259.91
260.38
259.83
260.19
261.56
260.28
259.95
259.82
259.69
259.84
259.55
259.84
22
259.87
260.21
259.80
260.16
261.27
260.27
259.93
259.81
259.67
259.84
259.61
259.84
23
259.82
260.13
259.84
260.10
261.00
260.27
259.92
259.81
259.66
259.84
259.65
259.84
24
259.81
260.07
259.85
260.31
260.95
260.39
259.92
259.80
259.67
259.84
259.72
259.84
25
260.19
260.22
259.97
260.60
260.85
260.30
259.91
259.79
259.67
259.84
259.76
259.84
26
260.11
260.31
262.96
260.24
260.72
260.24
259.92
259.78
259.67
259.83
259.80
259.83
27
260.00
260.19
261.97
260.12
260.60
260.22
259.90
259.78
259.67
259.83
259.83
259.83
28
259.91
260.44
261.40
260.36
260.49
260.23
259.89
259.77
259.67
259.83
259.82
259.83
29
259.90
261.18
260.71
260.31
260.32
260.29
259.89
259.77
259.67
259.83
259.82
259.83
30
259.92
260.61
260.42
260.16
260.45
260.25
259.89
259.76
259.67
259.82
259.82
31
260.40
260.80
260.43
259.89
259.67
259.82
259.82
----------
--------------
Mean
259.89
260.40
260.35
260.21
260.94
260.35
260.22
259.84
259.70
259.72
259.65
259.83
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Max
260.19
261.41
262.96
260.80
262.22
260.88
261.96
259.88
259.76
259.84
259.83
259.87
262.96
Min
259.68
260.07
259.80
259.92
260.22
259.93
259.88
259.76
259.66
259.62
259.53
259.82
259.53
263.30
m. (MSL.) ,
257.77
m. (MSL.) ,
River Bed 255.80
m. (MSL)
266.24
m. (MSL.) ,
266.70
m. (MSL.) ,
Drainage Area 590 Square Kilometers
at 12.00 Hours , on Jun 26 , 2011
Annual Max Momentary Gage Height
Zero Gage at Bottom Elevation
Left Bank Elevation
Right Bank Elevation