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K-State Agronomy eUpdates

Department of Agronomy

Kansas State University

1712 Claflin Rd.

2004 Throckmorton PSC

Manhatan, KS 66506

785-532-6101

agronomy@ksu.edu

Extension Agronomy

Heavy rains in northeast Kansas September 14 reach historic levels

The heavy rains that occurred in south central Kansas on Sept. 8-9 moved in to Northeastern Division on Sept. 14. Hiawatha, in Brown County, had particularly heavy amounts. As reported in the Sept. 12, 2106 issue of the Agronomy eUpdate, the Hydrometerological Design Studies Center, a branch of the National Oceanic and Atmospheric Administration, NOAA Atlas 14, addresses the frequency of rainfall events on time-scales ranging from 5 minutes to 60 days. Not surprisingly, return rates will differ at different parts of the state, as rainfall patterns vary. The 24-hour total of 9.73 inches reported at the Hiawatha COOP station falls in the 200-year return rates. Other stations in the vicinity reported 11 inches. The table below shows the recurrence intervals, with the recent event highlighted:

POINT PRECIPITATION FREQUENCY (PF) ESTIMATES for Hiawatha 9SE, Kansas

WITH 90% CONFIDENCE INTERVALS AND SUPPLEMENTARY INFORMATION

NOAA Atlas 14, Volume 8, Version 2

Duration

Average recurrence interval (years)

1

2

5

10

25

50

100

200

500

1000

60-min

1.38

1.64

2.09

2.47

3.01

3.44

3.88

4.34

4.96

5.45

(1.07‑

1.79)

(1.27‑

2.13)

(1.60‑

2.71)

(1.89‑

3.22)

(2.23‑

4.04)

(2.49‑

4.67)

(2.73‑

5.37)

(2.93‑

6.14)

(3.23‑

7.18)

(3.46‑

7.97)

2-hr

1.72

2.05

2.62

3.11

3.8

4.36

4.94

5.54

6.36

7.01

(1.34‑

2.21)

(1.60‑

2.64)

(2.03‑

3.37)

(2.40‑

4.01)

(2.85‑

5.07)

(3.20‑

5.87)

(3.51‑

6.77)

(3.78‑

7.77)

(4.19‑

9.13)

(4.50‑

10.2)

3-hr

1.92

2.29

2.93

3.49

4.29

4.94

5.62

6.33

7.32

8.1

(1.50‑

2.45)

(1.79‑

2.93)

(2.29‑

3.75)

(2.71‑

4.48)

(3.24‑

5.70)

(3.65‑

6.62)

(4.02‑

7.68)

(4.36‑

8.84)

(4.85‑

10.4)

(5.23‑

11.7)

6-hr

2.25

2.68

3.42

4.08

5.04

5.83

6.66

7.54

8.77

9.76

(1.78‑

2.84)

(2.12‑

3.38)

(2.69‑

4.33)

(3.19‑

5.17)

(3.85‑

6.63)

(4.35‑

7.74)

(4.81‑

9.02)

(5.24‑

10.4)

(5.88‑

12.4)

(6.37‑

13.9)

12-hr

2.58

3.03

3.83

4.55

5.61

6.5

7.44

8.44

9.86

11

(2.06‑

3.21)

(2.42‑

3.78)

(3.05‑

4.79)

(3.60‑

5.71)

(4.34‑

7.33)

(4.90‑

8.55)

(5.43

9.98)

(5.94‑

11.6)

(6.68‑

13.8)

(7.25‑

15.5)

24-hr

2.92

3.4

4.24

5

6.14

7.08

8.09

9.18

10.7

11.9

(2.36‑

3.60)

(2.74‑

4.20)

(3.41‑

5.25)

(4.00‑

6.21)

(4.80‑

7.93)

(5.40‑

9.23)

(5.98‑

10.8)

(6.52‑

12.5)

(7.33‑

14.9)

(7.95‑

16.7)

2-day

3.33

3.85

4.76

5.57

6.77

7.76

8.81

9.93

11.5

12.8

(2.71‑

4.06)

(3.13‑

4.70)

(3.86‑

5.82)

(4.50‑

6.84)

(5.34‑

8.63)

(5.97‑

9.98)

(6.57‑

11.6)

(7.12‑

13.3)

(7.96‑

15.8)

(8.59‑

17.7)

3-day

3.65

4.2

5.15

6

7.23

8.24

9.3

10.4

12

13.3

(2.99‑

4.42)

(3.44‑

5.09)

(4.20‑

6.26)

(4.87‑

7.31)

(5.73‑

9.14)

(6.38‑

10.5)

(6.97‑

12.1)

(7.53‑

13.9)

(8.36‑

16.4)

(8.98‑

18.3)

4-day

3.93

4.5

5.49

6.35

7.61

8.63

9.71

10.8

12.4

13.7

(3.23‑

4.74)

(3.70‑

5.43)

(4.49‑

6.63)

(5.17‑

7.71)

(6.05‑

9.56)

(6.70‑

11.0)

(7.30‑

12.6)

(7.85‑

14.4)

(8.68‑

16.9)

(9.30‑

18.7)

7-day

4.67

5.29

6.34

7.26

8.59

9.66

10.8

12

13.6

14.9

(3.88‑

5.58)

(4.38‑

6.32)

(5.24‑

7.60)

(5.96‑

8.73)

(6.87‑

10.7)

(7.56‑

12.1)

(8.17‑

13.8)

(8.73‑

15.7)

(9.57‑

18.3)

(10.2‑

20.2)

 

The full atlas, with access to other locations, can be found online at http://www.nws.noaa.gov/oh/hdsc/index.html

Additional precipitation maps for Kansas can be found on the Kansas Climate website at:  http://climate.k-state.edu/

Mary Knapp
mknapp@ksu.edu

Christopher Redmond
christopherredmond@ksu.edu