River and Reservoir Watch Version 4.6

River Discharge and Reservoir Storage Changes Using Satellite Microwave Radiometry

Location of this Satellite Gauging Reach

Tracking expansion and contraction of this lake

Poyang

Center:

116.005

Long.

Signal/Noise:

6.0

GFDS Area ID:

China

Center:

29.3465

Lat.

Fair

GEE Time Lapse

WorldView Time Lapse

Learn more about this lake

160997

sq km

WBM contributing area

Last measured:

17-May-25

Area Signal:

7395

Status:

#N/A

(1, low; 2, normal; 3, moderate flood, r >2.33 y; 4, major flood, r >5 y)

7-day Sum

#N/A

Area Signal/Contributing Area

#N/A

(7-day Signal compared to 20 y average for this date, 2004-2023)

Flood Magnitude:

#N/A

Scale of 0-10

Flood Magnitude Defined

Technical Summary

Notes:

7-day forward weighted moving average is applied.

Geolocation correction, commencing April 1, 2012:

Low Area is 20th percentile for this day, 2003-2013.

Notes:

Log Pearson Type III is used to compute recurrence intervals from 24 years of record (1998-2023)

Mean Area Signal

15026

Annual Area Signal (percent of mean, 1998-2021)

Mean Area/Contributing Area

2924

Mann-Kendall Runoff Trend Analysis (5%)

M-K

-77

Significant?

Major Floods

10 = flood of record

Sen's slope:

-0.01

z-stat

-1.68

Regression slope:

-0.01

p-value

0.09

Annual Maximum Area

Brakenridge, G. R., Nghiem, S. V., Kettner, A. J., Paris, S., Cohen, S.

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

-25

Robert.Brakenridge@Colorado.edu

Sen's slope:

-63.23

z-stat

-0.53

Regression slope:

-74.47

p-value

0.60

Significant?

Coefficients of Polynomial or Linear Rating Curve used:

-142061.92

136515.48

x^4

x^3

x^2