River and Reservoir Watch Version 4.6

River Discharge and Reservoir Storage Changes Using Satellite Microwave Radiometry

Location of this Satellite Gauging Reach

Some >7 day gaps in data collection exist in this record

Magdalena

Center:

-73.98

Long.

Signal/Noise:

8.6

GFDS Area ID:

130

Colombia

Center:

9.01

Lat.

Good

GEE Time Lapse

WorldView Time Lapse

Learn more about this river

165106

sq km

WBM contributing area

Last measured:

17-Jul-25

Discharge:

6511

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

24.7

mm

83%

(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

8335

m3/s

Annual Runoff (percent of mean, 1998-2021)

Mean Runoff

1580

mm

Mann-Kendall Runoff Trend Analysis (5%)

M-K

-101

Significant?

yes

Major Floods

10 = flood of record

Sen's slope:

-0.01

z-stat

-2.20

Regression slope:

-0.01

p-value

0.03

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:

-88.98

z-stat

Regression slope:

-120.85

p-value

0.22

Significant?

no

Coefficients of Polynomial or Linear Rating Curve used:

0.00

-57479.75

59131.74

x^4

x^3

x^2

x

+