From: Markus Ritsch [MLRitsch@water-and-earth.com]
Sent:
Sunday, August 03, 2008 3:00 PM
To: Kevin Stewart; Chad
Kudym
Cc: Markus Ritsch
Subject: Re: July 2008 Peak Rainfall
Intensity-Duration Amounts
Kevin,
This was pretty
interesting. Although July was a dry month, there was an unusually strong
storm on July 6 between 2:30 PM and 3:00 PM to the east of
Denver.
The Murphy Creek
Golf Course (ID 870) had short duration rainfall intensity that exceeded the
100-year values for the 10 and 15 minute periods (see the tables
below).
Why did I not see
sensor 830 and sensor 2930 in the rainfall rate alarm log file? These two
stations also had high intensity short duration rainfall.
Let me know if you
have any questions regarding the analysis or if you need more data/analysis from
me.
Thanks,
Markus
| 5
Minute Peak Intensities |
| Station |
Date |
Tips |
Inches |
in/hr |
Return |
| 870 |
7/6/08 2:46
PM |
17 |
0.669 |
8.031 |
< 100-yr |
| 830 |
7/6/08 2:40
PM |
11 |
0.433 |
5.197 |
10-year |
| 2930 |
7/18/08 7:04
PM |
10 |
0.394 |
4.724 |
< 10-yr |
| 730 |
7/6/08 2:29
PM |
9 |
0.354 |
4.252 |
<
10-yr |
| 10
Minute Peak Intensities |
| Station |
Date |
Tips |
Inches |
in/hr |
Return |
| 870 |
7/6/08 2:51
PM |
31 |
1.220 |
7.323 |
> 100-yr |
| 730 |
7/6/08 3:05
PM |
15 |
0.591 |
3.543 |
5-yr |
| 2930 |
7/18/08 7:08
PM |
14 |
0.551 |
3.307 |
5-yr |
| 830 |
7/6/08 2:40
PM |
12 |
0.472 |
2.835 |
>
2-yr |
| 15
Minute Peak Intensities |
| Station |
Date |
Tips |
Inches |
in/hr |
Return |
| 870 |
7/6/08 2:51
PM |
40 |
1.575 |
6.299 |
> 100-yr |
| 730 |
7/6/08 2:30
PM |
20 |
0.787 |
3.150 |
5-yr |
| 2930 |
7/18/08 7:11
PM |
16 |
0.630 |
2.520 |
5-yr |
| 30
Minute Peak Intensities |
| Station |
Date |
Tips |
Inches |
in/hr |
Return |
| 870 |
7/6/08 2:54
PM |
44 |
1.732 |
3.465 |
25-yr |
| 730 |
7/6/08 2:30
PM |
22 |
0.866 |
1.732 |
> 2-yr |
| 2930 |
7/18/08 7:15
PM |
17 |
0.669 |
1.339 |
<
2-yr |
| 1
Hour Peak Intensities |
| Station |
Date |
Tips |
Inches |
Return |
| 870 |
7/6/08 3:18
PM |
46 |
1.811 |
> 10-yr |
| 730 |
7/6/08 3:12
PM |
42 |
1.654 |
>
10-yr |
Markus Ritsch,
P.E.
Water & Earth Technologies,
Inc.
1225 Red Cedar Circle, Suite
A
Fort Collins, CO
80524
Tel: (970)
225-6080
Fax: (970)
225-6990