River and Reservoir Watch Version 4.6

River Discharge and Reservoir Storage Changes Using Satellite Microwave Radiometry

Location of this Satellite Gauging Reach

Niger

Center:

-3.15

Long.

Signal/Noise:

28.5

GFDS Area ID:

59

Mali

Center:

16.66

Lat.

Excellent

GEE Time Lapse

WorldView Time Lapse

Learn more about this river

377414

sq km

WBM contributing area

Last measured:

4-Jul-25

Poorly located site

Discharge:

147

m3/sec

Status:

1

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

7-day Runoff

0.2

mm

55%

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

Flood Magnitude:

0.0

Scale of 0-10

Flood Magnitude Defined

Technical Summary

Notes:

7-day forward moving average is applied.

Geolocation correction, commencing April 1, 2012:

0

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

Noise filter:

>.05 daily signal change

Notes:

Log Pearson Type III is used to compute recurrence intervals from 27 years of record (1998-2024)

Mean discharge

1798

m3/s

Annual Runoff (percent of mean, 1998-2021)

Mean Runoff

151

mm

Mann-Kendall Runoff Trend Analysis (5%)

M-K

51

Significant?

no

Major Floods

10 = flood of record

Sen's slope:

0.01

z-stat

1.10

Regression slope:

0.01

p-value

0.27

Annual Maximum Q, m3/s

Brakenridge, G. R., Nghiem, S. V., Kugler, Z., 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

Robert.Brakenridge@Colorado.edu

Sen's slope:

97.56

z-stat

Regression slope:

96.16

p-value

0.01

Significant?

yes

Coefficients of Polynomial or Linear Rating Curve used:

0.00

-26178.21

26056.00

x^4

x^3

x^2

x

+