| River and Reservoir Watch
Version 4.6 |
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| River
Discharge and Reservoir Storage Changes Using Satellite Microwave Radiometry |
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Location of this Satellite Gauging Reach |
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Nam Ngum |
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Center: |
102.505 |
Long. |
Signal/Noise: |
6.7 |
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| GFDS Area ID: |
242 |
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Laos |
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Center: |
18.3665 |
Lat. |
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Fair |
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| GEE
Time Lapse |
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WorldView
Time Lapse |
Learn more about this
river |
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15318 |
sq km |
WBM contributing area |
| Last measured: |
18-Nov-24 |
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| Discharge: |
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473 |
m3/sec |
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Status: |
2 |
(1, low; 2, normal flow; 3, moderate flood, r
>2.33 y; 4, major flood, r >5 y) |
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| 7-day Runoff |
20.4 |
mm |
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111% |
(7-day runoff compared to 20 y average for this
date, 2004-2023) |
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| Flood Magnitude: |
0.0 |
Scale of 0-10 |
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Flood
Magnitude Defined |
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Technical
Summary |
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Notes: |
7-day forward weighted moving average is
applied. |
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Geolocation correction, commencing April 1,
2012: |
0 |
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Low flow is 20th percentile discharge for this
day, 2003-2013. |
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Notes: |
Log
Pearson Type III is used to compute recurrence intervals from 24 years of
record (1998-2023) |
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Mean discharge |
656 |
m3/s |
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| Annual Runoff (percent of mean, 1998-2021) |
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Mean Runoff |
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1362 |
mm |
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| Mann-Kendall
Runoff Trend Analysis (5%) |
M-K |
-11 |
Significant? |
no |
Major Floods |
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10 = flood of record |
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0.00 |
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z-stat |
-0.22 |
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| Regression
slope: |
0.00 |
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p-value |
0.83 |
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Annual Maximum Q, m3/s |
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| Brakenridge, G.
R., Nghiem, S. V., Kettner, A. J., Paris, S., Cohen, S. |
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Access to Data |
| River and
Reservoir Watch Version 4.6, DFO Flood Observatory, University of Colorado |
Mann-Kendall Max Q Trend Analysis (5%) |
M-K |
-81 |
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| Robert.Brakenridge@Colorado.edu |
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Sen's slope: |
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-28.12 |
z-stat |
-1.76 |
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Regression slope: |
-19.70 |
p-value |
0.08 |
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Significant? |
no |
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Coefficients of
Polynomial or Linear Rating Curve used: |
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-40908.57 |
40068.87 |
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x^4 |
x^3 |
x^2 |
x |
+ |
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