Basic HTML Version
390
Location : on left bank at Ban Na Chan.
415
sq.km.
Drainge Area
WATER YEAR : 2011
NAN RIVER BASIN
Lam Nam Khan at Ban Na Chan , Phitsanulok (N.59)
Lat 17 - 01 - 49 N Long 100 - 50 - 35 E
Amphoe
Nakhon Thai
Changwat
Phitsanulok
Ban
Na Chan
Staff gage
+197.680 m. (MSL.)
B.M.-H.D.
On left bank about 25 meters from the top staff gage.
Elevation
5-time daily readings at 06.00, 09.00, 12.00, 15.00 and 18.00 hours.
Arithmetic means of 5 readings
1984 to date
Rating Operation
Period of Available Gage Records
Location BM
Basis of Mean Daily Gage Height
Gage Reading Frequency
Zero Gage at Bottom
+206.935 m. (MSL.)
Bench Mark
Type of Gage
1996 to date
-
1996 to date
Stable.
Overbank flow startsat elevation +205.930 m.(MSL.), records are channel flow only.
Records good. Stage-discharge relation defined by 23 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
200.46
202.34
202.92
202.49
204.45
205.80
203.73
201.54
200.90
200.69
200.61
200.42
2
200.43
202.38
202.71
203.63
204.37
204.97
204.02
201.46
200.89
200.69
200.61
200.42
3
200.45
201.22
201.88
202.86
204.54
206.20
203.70
201.40
200.89
200.69
200.94
200.44
4
200.44
201.27
202.11
203.25
203.82
204.95
205.67
201.39
200.88
200.67
201.00
200.41
5
200.43
203.34
202.53
202.61
203.07
204.48
204.71
201.38
200.87
200.67
200.86
200.39
6
200.43
203.31
202.59
202.48
202.56
206.53
204.83
201.38
200.87
200.66
200.72
200.41
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Gage Height in Meter (MSL.) Water Year April 1, 2011 to March 31, 2012
7
200.32
203.69
202.83
202.01
202.28
206.55
204.08
201.37
200.87
200.65
200.66
200.39
8
200.34
203.27
202.12
201.93
202.12
206.42
203.58
201.35
200.88
200.64
200.64
200.38
9
200.44
202.28
201.88
201.91
203.04
205.92
203.22
201.33
200.86
200.63
200.61
200.37
10
200.42
201.98
201.80
201.92
202.61
205.79
202.88
201.32
200.85
200.62
200.60
200.43
11
200.41
202.35
201.66
202.46
203.00
205.06
202.51
201.31
200.84
200.58
200.58
201.05
12
200.56
201.78
201.64
201.83
203.32
204.95
202.12
201.27
200.83
200.61
200.58
201.06
13
200.50
201.42
201.87
202.47
202.86
205.34
203.05
201.23
200.82
200.62
200.58
200.64
14
200.47
201.42
203.52
202.33
202.74
205.30
202.59
201.20
200.80
200.62
200.57
200.53
15
200.42
202.57
201.88
203.10
202.75
205.11
203.01
201.18
200.79
200.63
200.57
200.51
16
200.37
201.48
202.05
204.46
202.42
205.69
203.56
201.16
200.77
200.63
200.57
200.55
17
200.41
201.41
203.48
203.42
203.27
206.22
202.30
201.15
200.76
200.59
200.56
200.65
18
200.35
201.88
204.92
202.59
203.84
205.23
202.31
201.14
200.73
200.56
200.55
200.54
19
200.33
202.92
203.44
205.09
203.70
204.75
202.27
201.13
200.71
200.59
200.55
200.48
20
200.73
204.73
202.78
204.09
205.53
204.40
202.08
201.12
200.68
200.66
200.54
200.46
21
200.46
202.79
202.32
203.60
204.67
204.84
202.02
201.05
200.65
200.77
200.53
200.44
22
200.42
202.10
202.24
203.21
203.87
204.12
201.92
201.01
200.64
200.72
200.51
200.43
23
202.53
201.63
202.23
203.01
203.26
204.78
201.88
201.00
200.63
200.67
200.49
200.41
24
200.99
202.04
201.89
202.90
202.91
204.79
201.83
200.99
200.63
200.61
200.49
200.41
25
200.72
202.82
202.08
202.74
202.51
204.77
201.81
200.98
200.62
200.62
200.50
200.38
26
200.80
202.38
202.08
202.90
202.90
204.41
201.75
200.97
200.62
200.61
200.51
200.42
27
200.87
202.81
202.04
203.02
203.95
205.08
201.71
200.96
200.61
200.61
200.50
200.38
28
200.62
203.87
202.54
203.36
202.89
205.59
201.69
200.95
200.60
200.60
200.45
200.37
29
200.97
205.05
202.22
203.17
202.72
205.04
201.70
200.94
200.60
200.59
200.43
200.40
30
200.76
204.33
202.00
203.45
205.52
204.28
201.63
200.94
200.59
200.61
200.39
31
203.50
203.06
206.41
201.58
200.58
200.61
200.38
----------
--------------
Mean
200.60
202.59
202.41
202.95
203.48
205.25
202.77
201.19
200.75
200.64
200.60
200.48
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Max
202.53
205.05
204.92
205.09
206.41
206.55
205.67
201.54
200.90
200.77
201.00
201.06
206.55
Min
200.32
201.22
201.64
201.83
202.12
204.12
201.58
200.94
200.58
200.56
200.43
200.37
200.32
206.75
m. (MSL.) ,
197.68
m. (MSL.) ,
River Bed 198.28
m. (MSL)
206.39
m. (MSL.) ,
205.92
m. (MSL.) ,
Drainage Area 415 Square Kilometers
at 06.00 Hours , on Aug 31 , 2011
Annual Max Momentary Gage Height
Zero Gage at Bottom Elevation
Left Bank Elevation
Right Bank Elevation