Page 620 - Slide 1

586
Location : on right bank at the bridge of Phet Kasem Highway near the guidepost 423.
61 sq.km.
Amphoe Bang Saphan Noi Changwat Prachuap Khiri Khan Ban Chang Laek
WATER YEAR : 2012
WEST COAST - GULF BASIN
Khlong Yai at Ban Chang Laek , Prachuap Khiri Khan (Gt.11)
Lat 11 - 03 - 44 N Long 99 - 22 - 30 E
Drainge Area
Staff gage
+36.375 m. (MSL.)
B.M.- Highways Dept.
On right bank at the abutment of the bridge. Elevation
5-time daily readings at 06.00, 09.00, 12.00, 15.00 and 18.00 hours.
Arithmetic mean of 5 readings
1979 to date
Basis of Mean Daily Gage Height
Gage Reading Frequency
Zero Gage at Bottom
+45.340 m. (MSL.)
Type of Gage
Bench Mark
Location BM
Rating Operation
Period of Available Gage Records
1980 to date
-
1980 to date
Stable.
No overbank flow.
Records good. Stage-discharge relation defined by 38 discharge measurements made in 2012.
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
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1 37.17 37.15 37.30 37.29 37.28 37.26 37.26 37.41 37.99 37.26 37.17 37.09
2 37.17 37.15 37.30 37.29 37.28 37.26 37.26 37.31 37.84 37.26 37.15 37.09
3 37.17 37.15 37.30 37.29 37.28 37.26 37.26 37.29 37.68 37.25 37.13 37.09
4 37.17 37.17 37.34 37.29 37.28 37.26 37.26 37.29 37.63 37.25 37.11 37.09
5 37.16 37.18 37.37 37.29 37.28 37.26 37.26 37.29 37.57 37.25 37.07 37.09
6 37.16 37.18 37.31 37.28 37.27 37.26 37.26 37.29 37.53 37.24 37.04 37.09
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Gage Height in Meter (MSL.) Water Year April 1, 2012 to March 31, 2013
7 37.16 37.18 37.31 37.28 37.26 37.26 37.26 37.29 37.49 37.24 37.02 37.08
8 37.16 37.17 37.31 37.28 37.26 37.26 37.26 37.29 37.46 37.23 37.02 37.08
9 37.15 37.16 37.31 37.28 37.26 37.30 37.28 37.29 37.44 37.23 37.01 37.08
10 37.15 37.15 37.30 37.28 37.26 37.27 37.30 37.29 37.41 37.22 37.00 37.08
11 37.16 37.15 37.30 37.28 37.26 37.27 37.29 37.29 37.36 37.22 37.07 37.08
12 37.16 37.15 37.30 37.28 37.26 37.27 37.29 37.29 37.36 37.22 37.11 37.07
13 37.16 37.15 37.30 37.28 37.26 37.27 37.29 37.29 37.36 37.21 37.11 37.07
14 37.15 37.14 37.30 37.28 37.26 37.27 37.29 37.29 37.35 37.21 37.10 37.07
15 37.15 37.14 37.30 37.28 37.26 37.27 37.29 37.29 37.34 37.21 37.10 37.07
16 37.15 37.14 37.30 37.28 37.26 37.26 37.29 37.29 37.33 37.20 37.10 37.07
17 37.15 37.15 37.29 37.28 37.26 37.37 37.29 37.29 37.32 37.20 37.10 37.06
18 37.15 37.16 37.29 37.28 37.26 37.29 37.29 37.35 37.31 37.20 37.10 37.06
19 37.16 37.16 37.29 37.28 37.26 37.27 37.29 37.35 37.30 37.20 37.10 37.06
20 37.16 37.15 37.29 37.28 37.26 37.27 37.29 37.40 37.30 37.20 37.10 37.07
21 37.17 37.15 37.29 37.28 37.26 37.26 37.29 37.30 37.30 37.19 37.10 37.07
22 37.17 37.15 37.29 37.28 37.26 37.26 37.29 37.29 37.29 37.19 37.10 37.07
23 37.17 37.15 37.29 37.28 37.26 37.25 37.29 37.29 37.29 37.19 37.10 37.07
24 37.16 37.16 37.29 37.28 37.26 37.25 37.74 37.30 37.28 37.19 37.10 37.07
25 37.16 37.16 37.29 37.28 37.26 37.25 37.55 37.36 37.28 37.19 37.10 37.07
26 37.15 37.17 37.29 37.28 37.26 37.24 37.40 37.69 37.28 37.20 37.09 37.07
27 37.15 37.17 37.29 37.28 37.26 37.24 37.33 37.71 37.28 37.20 37.09 37.07
28 37.15 37.18 37.29 37.28 37.26 37.24 37.30 37.78 37.27 37.20 37.09 37.07
29 37.15 37.24 37.29 37.28 37.26 37.25 37.30 38.01 37.26 37.21 37.07
30 37.15 37.28 37.29 37.28 37.26 37.25 37.29 37.98 37.26 37.29 37.06
31 37.29 37.28 37.26 37.29 37.26 37.18 37.06
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Mean 37.16 37.17 37.30 37.28 37.26 37.26 37.31 37.40 37.40 37.22 37.09 37.07
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Max 37.17 37.29 37.37 37.29 37.28 37.37 37.74 38.01 37.99 37.29 37.17 37.09 38.01
Min 37.15 37.14 37.29 37.28 37.26 37.24 37.26 37.29 37.26 37.18 37.00 37.06 37.00
38.16 m. (MSL.) ,
36.38 m. (MSL.) , River Bed 36.70 m. (MSL.)
44.68 m. (MSL.) ,
45.62 m. (MSL.) , Drainage Area 61 Square Kilometers
at 20.00 Hours , on Nov 29, 2012 Annual Max Momentary Gage Height
Zero Gage at Bottom Elevation
Right Bank Elevation
Left Bank Elevation