River and Reservoir Watch Version 4.6

River Discharge and Reservoir Storage Changes Using Satellite Microwave Radiometry

Location of this Satellite Gauging Reach

Sao Francisco

Center:

-43.47

Long.

Signal/Noise:

19.1

GFDS Area ID:

21

Brazil

Center:

-13.04

Lat.

Excellent

GEE Time Lapse

WorldView Time Lapse

Learn more about this river

262424

sq km

WBM contributing area

Last measured:

31-May-25

Discharge:

2504

m3/sec

Status:

2

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

7-day Runoff

5.8

mm

87%

(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:

>.03 daily signal change

Notes:

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

Mean discharge

2818

m3/s

Annual Runoff (percent of mean, 1998-2021)

Mean Runoff

342

mm

Mann-Kendall Runoff Trend Analysis (5%)

M-K

-27

Significant?

no

Major Floods

10 = flood of record

Sen's slope:

0.00

z-stat

-0.57

Regression slope:

0.00

p-value

0.57

Annual Maximum Q, m3/s

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

Robert.Brakenridge@Colorado.edu

Sen's slope:

0.96

z-stat

Regression slope:

11.81

p-value

1.00

Significant?

no

Coefficients of Polynomial or Linear Rating Curve used:

0.00

1760471.18

-3682731.75

1920996.59

x^4

x^3

x^2

x

+