2004-04-07 Mud Lake Outlet-A
SEH
April 7, 2004
Ms. Patricia Fowler
Area Hydrologist
MN DNR
940 Industrial Drive South
Suite 103
Sauk Rapids, MN 56379
Dear Ms. Fowler:
RE: Albertville, Minnesota
Mud Lake Outlet
SEH No. A ALBEV 0314 32
We would like to finalize the permit application for the Mud Lake (86-26P) outlet which we submitted to
your office last fall. The following items are in response to your letter dated Nov. 7, 2003:
1. The watershed model shows that a 27-inch culvert at elevation 945.9 will meet your office's
requirement of maintaining the existing outlet elevation and also meet the 17.1 cfs Mud Lake
peak discharge agreement with the City of Otsego (for the 100-year rain event). We propose to
change our application to this outlet configuration.
2. The natural runout location for Mud Lake has not been touched by any of the Mud Lake outlet
cleanout operations we conducted. This area has not been surveyed by SEH for any City projects,
so we cannot determine if the existing channel profile matches what the DNR surveyed in 1986.
We are assuming the existing designated DNR runout location and elevation are still the official
outlet characteristics.
Please advise us as soon as possible as to the next steps we need to take to finalize this application. You
can reach me at 320.229.4383 with any questions.
Sincerely,
J
t �
annon Smith, PE
Project Engineer
ses/djg
c: Pete Carlson, SEH
Jim Schulz, SEH
u.\alslne.%031400\cDrrv-dnr-WO4.doc
Short Elliott Hendrickson Inc., 1200 25th Avenue South, P.O. Box 1717, St. Cloud, MN 56302-1717
SEH is an equal opportunity employer l www.sehinc.com 1 320.229.4300 1 800.572.0617 1 320.229.4301 fax
Albertville Hydrologic Study
Table 1 - Proposed Conditions XP-SWMM Modeling Results
AALBEV0314.00
Wetland (upstream of Both) _
946.9
37 cfs
36"
RCP
945.5
944.9
Wetland (Downstream of Mud)
36"
RCP
946.2
945.5
Mud Lake
36"
CMP
945.9
946.2
School Lake
36"
CMP
946.2
946.7
)Jcisttn Cdndlion
otlandlvaton
D t; ar
Wetland (upstream of loth)
947.1
46 cfs
36"
RCP
945.5
944.9
Wetland (Downstream of mud)
947.5
20 cfs
36"
RCP
946.2
945.5
Mud Lake
947.6
20 cfs
36"
CMP
945.9
946.2
School Lake
949.0
30 cfs
36"
CMP
946.2
946.7
Wetland (upstream of loth)
946.9
33.6 cfs
36"
RCP
945.5
944.9
Mud Lake
947.5
17.1 cfs
27"
RCP
945.9
- 945.5
School Lake
949.0
30.4 cfs
36"
CMP
946.2
946.7
Notes:
1. All models run for 100-yr event.
2. Proposed Condition: Maintain existing NWL; Do not exceed a final discharge of 17.4 cfs.
Mud Lk. and Downstream wetland are one pool; delete one culvert
Starting water surface of Mud lake = 946.0
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