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What can lake buoys tell us about a once in 250 year rainfall event – case study
from Lough Feeagh Elvira de Eyto, Mary Dillane, Liz
Ryder, Karin Sparber, Eleanor Jennings and Russell Poole
Gleon Wisconsin October 2009
Rainfall on 2nd July 2009
Lodge Gaulaun Buckagh Rough 2 Millrace Rough 3 BlackMaumeratt
aNamaroo
n
2nd July Total
64.8 46.8 60.8 56.4 52.9 42 42 30.840
2 hours 52.4 35.2 50.4 47.6 41.8 34.4 32 24.6 33.2
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
00
:00
:00
02
:00
:00
04
:00
:00
06
:00
:00
08
:00
:00
10
:00
:00
12
:00
:00
14
:00
:00
16
:00
:00
18
:00
:00
20
:00
:00
22
:00
:00
00
:00
:00
02
:00
:00
04
:00
:00
06
:00
:00
08
:00
:00
10
:00
:00
12
:00
:00
14
:00
:00
16
:00
:00
18
:00
:00
20
:00
:00
22
:00
:00
lodge
gaulaun
rr2
buc
fur
rr3
blk
maum
nam
250 year return time for 2 hourly rainfall of > 44.7 mm
01/0
1/20
0908
/01/
2009
15/0
1/20
0922
/01/
2009
29/0
1/20
0905
/02/
2009
12/0
2/20
0919
/02/
2009
26/0
2/20
0905
/03/
2009
12/0
3/20
0919
/03/
2009
30/0
3/20
0906
/04/
2009
13/0
4/20
0920
/04/
2009
27/0
4/20
0904
/05/
2009
11/0
5/20
0918
/05/
2009
25/0
5/20
09
01/0
6/20
0908
/06/
2009
15/0
6/20
0922
/06/
2009
29/0
6/20
0906
/07/
2009
13/0
7/20
0920
/07/
2009
27/0
7/20
0903
/08/
2009
0
1
2
3
4
5
6
7
Water Level (m)
Black river
01
/01
/20
09
07
/01
/20
09
13
/01
/20
09
19
/01
/20
09
25
/01
/20
09
31
/01
/20
09
06
/02
/20
09
12
/02
/20
09
18
/02
/20
09
24
/02
/20
09
02
/03
/20
09
08
/03
/20
09
14
/03
/20
09
20
/03
/20
09
26
/03
/20
09
01
/04
/20
09
07
/04
/20
09
13
/04
/20
09
19
/04
/20
09
25
/04
/20
09
01
/05
/20
09
07
/05
/20
09
13
/05
/20
09
19
/05
/20
09
25
/05
/20
09
31
/05
/20
09
06
/06
/20
09
12
/06
/20
09
18
/06
/20
09
24
/06
/20
09
30
/06
/20
09
06
/07
/20
09
12
/07
/20
09
0
1
2
3
4
5
6
Water Level (m)
Rough river
(daily maximum water levels)
Rough River 3-7-2009
Feeagh Harbour
0
100
200
300
400
500
600
Feb
-200
9
Mar
-200
9
Apr
-200
9
May
-200
9
Jun-
2009
Jul-
2009
Jul-
2009
Aug
-200
9
Dai
ly a
vere
age
Nep
hel
omet
er (
mV
)0
20
40
60
80
100
120
140
Dai
ly r
ain
fall
(mm
)
Daily Rainfall Nephelometer readings
18/0
5/20
0614
/06/
2006
11/0
7/20
0607
/08/
2006
03/0
9/20
0630
/09/
2006
27/1
0/20
0623
/11/
2006
20/1
2/20
0616
/01/
2007
12/0
2/20
0711
/03/
2007
07/0
4/20
0704
/05/
2007
31/0
5/20
0727
/06/
2007
24/0
7/20
0720
/08/
2007
16/0
9/20
0713
/10/
2007
09/1
1/20
0706
/12/
2007
02/0
1/20
0829
/01/
2008
25/0
2/20
0823
/03/
2008
19/0
4/20
0816
/05/
2008
12/0
6/20
0809
/07/
2008
05/0
8/20
0801
/09/
2008
28/0
9/20
0825
/10/
2008
21/1
1/20
0818
/12/
2008
14/0
1/20
0910
/02/
2009
09/0
3/20
0905
/04/
2009
02/0
5/20
0929
/05/
2009
25/0
6/20
0922
/07/
2009
18/0
8/20
0914
/09/
2009
0
100
200
300
400
500
600
700
800 0
20
40
60
80
100
120
140
160
180
200
Nephelometer for 2004 – 2009 for context
17 A
pril 2
007
6 Ju
ne 2
007
8 Au
gust
200
7
26 S
epte
mbe
r 200
7
24 O
ctob
er 2
007
16 N
ovem
ber 2
007
14 D
ecem
ber 2
007
8 Fe
brua
ry 2
008
18 M
arch
200
8
31 M
arch
200
8
29 A
pril 2
008
23 M
ay 2
008
23 J
une
2008
7 Au
gust
200
8
18 S
epte
mbe
r 200
8
24 O
ctob
er 2
008
3 D
ecem
ber 2
008
26 J
anua
ry 2
009
2 M
arch
200
9
16 A
pril 2
009
22 M
ay 2
009
22 J
une
2009
4 Au
gust
200
9
7 Se
ptem
ber 2
009
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Chlorophyll a µg l-1
flood
9 J
an
ua
ry 2
00
42
5 M
arc
h 2
00
42
2 A
pri
l 20
04
6 J
uly
20
04
15
Se
pte
mb
er
20
04
31
Ja
nu
ary
20
05
11
Ap
ril 2
00
52
3 J
un
e 2
00
51
5 S
ep
tem
be
r 2
00
51
7 F
eb
rua
ry 2
00
62
8 M
arc
h 2
00
62
5 M
ay
20
06
11
Au
gu
st
20
06
6 D
ec
em
be
r 2
00
61
7 A
pri
l 20
07
14
Ju
ne
20
07
8 A
ug
us
t 2
00
72
6 S
ep
tem
be
r 2
00
73
1 O
cto
be
r 2
00
72
8 N
ov
em
be
r 2
00
71
Fe
bru
ary
20
08
18
Ma
rch
20
08
3 A
pri
l 20
08
13
Ma
y 2
00
82
3 J
un
e 2
00
87
Au
gu
st
20
08
27
Au
gu
st
20
08
26
Se
pte
mb
er
20
08
24
Oc
tob
er
20
08
3 D
ec
em
be
r 2
00
81
5 J
an
ua
ry 2
00
91
9 F
eb
rua
ry 2
00
92
Ma
rch
20
09
1 A
pri
l 20
09
29
Ap
ril 2
00
92
2 M
ay
20
09
11
Ju
ne
20
09
24
Ju
ne
20
09
4 A
ug
us
t 2
00
91
Oc
tob
er
20
09
0
0.5
1
1.5
2
2.5
3
Secchi Depth meters
But what about the microbial loop?? Not sure yet
• Longevity of sediment readings – how long to get back to baseline?
• Effects on the microbial loop
• Effects on stratification/thermocline (at the moment looks like nothing really changed
• Effects on metabolism
• Effect on Lough Furnace
• Write it up maybe after a full annual cycle
• Any ideas about what we might look for / additional analysis
Thanks to Gleon and the Gordon and Betty Moore Foundation
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