2004-04-16 Mud Lake Permit AppSEH
April 16, 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
Permit Application, Mud Lake
SEH No. A ALBEV 0314 32
The following items are in response to our phone conversation of April 12, 2004 about the outlet permit
application for the proposed outlet structure, Mud Lake (86-26P), in Wright County.
1. Model results. I have attached a new Table 1, which reports the model results for the proposed
Mud Lake culvert outlet.
2. Wetland permit. The Developer will be completing the wetland permit as a part of their planning
process.
3. Culvert plan details. I have attached a typical detail sheet that shows what the outlet requirements
will be for this culvert, including the apron and riprap. The road elevation at that location is
proposed to be about 956.00-feet. With this elevation, and the modeled 100-year high water level
of 947.5-feet, there is no predicted 100-year event flooding risk for the new road.
4. Channel clean out. The City has no plans to clean out the channel for any purpose, other than to
keep the outlet channel free from vegetation that hinders water discharge. The Developer also has
no plans to clean out any material from the channel, except for under the proposed roadway.
Under the roadway they will clean out material that is not suitable as a road base. The Developer
will be able to present their calculations for wetland material removal as they progress with the
plans. At this time, they are waiting for the outlet permit approval before they finalize their plans.
Please let me know if there is any further information that you need to submit the permit application. You
can reach me at 320.229.4383 with any questions.
Sincerely,
Shannon Sant , E
Project Engineer
sesljmw
c: Pete Carlson, SEH
Jim Schulz, SEH
Fran Hagen, Westwood Professional Services
_ cAa projem\albev0314U-dnr-041504.doc
Short Elliott Hendrickson Inc., 1200 25th Avenue South, P.O. Box 1717, St. Cloud, MN 56302-1717
SEH is an equal opportunity employer I www.sehinc.com 1 320.229.4300 1 800.572.0617 1 . 320.229.4301 fax
Albertville Hydrologic Study
Table 1 - Existing and Proposed Conditions XP-SWMM Modeling Results
AALBEV0314.00
Wetland (Upstream of loth)
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
Wetland (Upstream of loth)
947.1 46 cfs
947.5 20 cfs
36" RCP
d
945.5
944.9
Wetland (Downstream of Mud)
36" RCP
946.2
945.5
Mud Lake
947.6 20 cfs
949.0 30 cfs
36" CMP
945.9
946.2
School Lake
36" CMP
946.2
946.7
33.6 cfs
946.9 3Rv
.'*`.'.�
Wetland (Upstream of loth)
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:
s 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
Tablel 041304 short ver.xls 4/15/04
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CLASS III RIPRAP- REQUIREMENTS 2 1 O
12" TO 24" 6 CUBIC YARDS
27" TO 33" 12 CUBIC YARDS
36" TO 48" 18 CUBIC YARDS 5 X DIAMETER
54" AND UP 24 CUBIC YARDS
(ONE CUBIC YARD IS OR SPAN
APPROXIMATELY 2,800 LBS) PLAN
GEOTEXTILE FILTER BLANKET
SHALL EXTEND UNDER APRON
NOTE FILTER BLANKET RE,______
UNDER RIPRAP OR 2 LAYERS OF 50OX
"MIRAFI" FABRIC OR EQUAL
a
SEC. A -A
SEC. B-B
RIPRAP
SLOPE VARIES
RIPRAP
LINER
RIPRAP
FILTER BLANKET
LINER
- CLASS III RIPRAP, D50- 9 IN. (MNDOT SPEC 3601)
RIPRAP AT OUTLETS
ALBERTVILLE, MINNESOTA
STO-9b