7-Kos952935D_25-09_Final_Plans_6-18-25.pdf

PDF 7 MB Posted Sep 7, 2025

Attached to: Kos952935D Nutrient Reduction Wetland
Solicitation number: 009-RFB-WRBWL-CY25-09
Issued by: Polk County, Davenport City, Iowa

About this file

Written by GovTribe AI · Dec 1, 2025

Summary

This is a final construction plans document for Project KOS952935D, a Constructed Wetland for Nutrient Removal in Kossuth County, Iowa, prepared by Ducks Unlimited, Inc. in cooperation with the Iowa Department of Agriculture and Land Stewardship and the United States Department of Agriculture. The project encompasses extensive earthwork and environmental infrastructure including 13,843 cubic yards of general excavation, 21,697 cubic yards of earthfill across three categories, 636 square feet of steel sheet piling, 1,082 tons of Class E riprap, 812 linear feet of HDPE dual-wall tile installation (both 12-inch and 15-inch diameter), concrete structures including a water control structure and multiple CMP risers, and 34.8 acres of seeding across structural and buffer areas. The project includes detailed specifications for 28 bid items with quantities ranging from mobilization/demobilization to specialized components such as filter diaphragms, turf reinforcement matting, and erosion control check dams. Construction is planned for completion by June 15, 2026, with final seeding completion by June 30, 2026. A pre-bid conference is scheduled for September 16, 2025, in Algona, Iowa, and all bids must be submitted through the IMPACS platform by September 30, 2025, at 3:00 PM CDT. The planned wetland will encompass approximately 27.576 acres at normal water level with an average pool depth of 1.5 feet, designed to provide nutrient reduction from a 64-acre contributing surface watershed and 1,154.9-acre subsurface watershed.

The estimated construction cost ranges between $650,000 and $800,000. Bidders must be registered with the Iowa Division of Labor and submit a bid bond equivalent to 10% of the project cost, with a Performance/Payment Bond of 100% of the contract price required upon award. Funding sources include support from the USDA and IDALS. The plans note that construction site safety is the sole responsibility of the contractor, and all work must comply with NRCS specifications for Iowa or the Iowa Statewide Urban Design and Specifications (SUDAS) standards. The project involves coordination with multiple property owners including Giese Family Farms, Inc., Sabin Family Farms LLC, DAPEMA LLC, and others whose land comprises the project site. Contractors must comply with all applicable federal, state, and local laws, including the Federal Endangered Species Act, with specific requirements for tree removal timing between October 1 and March 31 to protect threatened/endangered bats. Technical questions should be directed to Andrew Schippers, P.E., the professional engineer of record (License P26317, renewal date December 31, 2025).

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File	Type	Posted
6-Kos952935D_25-09_Project_Specifications_05-07-25.pdf	PDF	Sep 7, 2025
3-Kos952935D_25-09_Contract_Doc_DD.pdf	PDF	Sep 7, 2025
5-Kos952935D_25-09_Bid_Construction_Book_General_Requirements.pdf	PDF	Sep 7, 2025
2-Kos952935D_25-09_Affidavit_Doc_CC.pdf	PDF	Sep 7, 2025
8-Kos952935D_25-09_Appendix1_Construction_&_AdminForms.pdf	PDF	Sep 7, 2025
1338572-event.pdf	PDF	Sep 7, 2025
1-Kos952935D_25-09_Notice_to_Bidders.pdf	PDF	Sep 7, 2025
4-Kos952935D_25-09_Bid_Bond_Doc_EE.pdf	PDF	Sep 7, 2025

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PROJECT NO. KOS952935D

CONSTRUCTED WETLAND FOR NUTRIENT REMOVAL

KOSSUTH COUNTY

S35, T95N, R29E

IOWA

IN COOPERATION WITH

IOWA DEPARTMENT OF AGRICULTURE AND LAND STEWARDSHIP

& UNITED STATES DEPARTMENT OF AGRICULTURE

IOWA ENGINEERING JOB CLASS II

PROJECT LOCATION

Know what's below.

Call before you dig.

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PROJECT LOCATION MAP

SCALE: 1" = 1000'

AFFIX SEAL: DUCKS UNLIMITED, INC.

ON:

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CAD FILE:

DRAWN BY:

SURVEYED BY:

REVIEWER:

DATE:

PROJECT NUMBER:

R ev is io ns D at e

B y

R ev is io n S he et

C001

04-28-2025

T.P.

A.B. & A.S.

M.L.H.

A.S.

IA-340-11 MANSKE C001 - COVER -

MLH

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170TH ST.

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PROJECT LOCATION

IOWA

.\Xref Links\usda-logo-color.png

UTILITIES NOTE:

BEFORE THE START OF CONSTRUCTION, THE OWNER OF

ANY UTILITIES INVOLVED MUST BE NOTIFIED. THE

EXCAVATOR/CONTRACTOR IS RESPONSIBLE FOR GIVING

THIS NOTICE BY CALLING "IOWA ONE CALL" AT (800) 292-8989

AT LEAST 48 HOURS PRIOR TO ANY EXCAVATION.

TICKET #:

To the best of my professional knowledge, judgement, and belief, these plans meet applicable NRCS Standards

I hereby certify that this engineering document was prepared by me or under my direct personal supervision and that I am a duly licensed Professional Engineer under the laws of the State of Iowa.

Andrew Schippers, P.E. Date

My license number is P26317 My license renewal date is December 31, 2025 Pages of sheets covered by this seal: 1 - 21 (C001-C401)

Sheet List Table

Sheet Number Sheet Title

C001 COVER SHEET

C002 SPECIFICATIONS, QUANTITIES, & NOTES

C051 TOPOGRAPHY & EXISTING CONDITIONS

C101 SITE PLAN

C201 PRIMARY SPILLWAY & DRAW DOWN PLAN

C202 AUXILIARY SPILLWAY PLAN

C203 WETLAND PROFILES

C204 MAIN BERM PROFILES

C205 CHANNEL PROFILES

C206 RIPRAP RIFFLE DIVERSION PLAN & PROFILE

C207 15 INCH HDPE PLAN & PROFILE

C208 12 INCH PIPE PLAN & PROFILE

C209 OXBOW SPILLWAY PLAN & PROFILE

C301 RIPRAP RIFFLE INTAKE STRUCTURE DETAILS

C302 SHEET PILE DETAILS

C303 CONSTRUCTION DETAILS

C304 WCS DETAILS SHEET 1

C305 WCS DETAILS SHEET 2

C306 FILTER DIAPHRAGM DETAILS

C307 ANTI-SEEP COLLAR DETAILS

C401 SEEDING PLAN

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CAD FILE:

DRAWN BY:

SURVEYED BY:

REVIEWER:

DATE:

PROJECT NUMBER:

R ev is io ns D at e

B y

R ev is io n S he et

C002

04-28-2025

T.P.

A.B. & A.S.

M.L.H.

A.S.

IA-340-11 MANSKE C001 - COVER -

MLH

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US-IA-340-11

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ESTIMATED QUANTITIES

NOTE # BID ITEM # SPEC # DESCRIPTION QUANTITY UNIT

1 1 IA CS-001 STRIPPING LS 1.0

2 2 IA CS-001 CROP DAMAGE AC 0.0

3 3 IA CS-006 STRUCTURE SEEDING AC 4.8

4 4 IA CS-006 BUFFER SEEDING AC 30.0

5 5 CS-008 MOBILIZATION & DEMOBILIZATION LS 1.0

6 6 IA CS-009 DRAINAGE TILE INVESTIGATION LS 1.0

7 7 IA CS-013 STEEL SHEET PILING SF 636.0

8 8 IA CS-021 EXCAVATION (GENERAL) CY-P 13,843.0

9 9 IA CS-023 EARTHFILL (GENERAL) CY-P 1,944.0

10 10 IA CS-023 EARTHFILL (GENERAL DAM) CY-P 15,518.0

11 11 IA CS-023 EARTHFILL (DAM CORE) CY-P 4,235.0

12 12 IA CS-024 DRAINFILL (SAND) TN 20.0

13 13 IA CS-024 FILTER DIAPHRAM LS 1.0

14 14 IA CS-026 TOPSOIL PLACEMENT CY-P 20,148.0

15 15 IA CS-046 12"Ø HDPE DUAL-WALL LF 95.0

16 16 IA CS-046 15"Ø HDPE DUAL-WALL LF 572.5

17 17 IA CS-051 ALUMINUM WATER CONTROL STRUCTURE (WCS) LS 1.0

18 18 IA CS-051 15"Ø ALUMINUM CMP DRAWDOWN PIPE LF 65.0

19 19 IA CS-046,

IA CS-081 STOPLOG STORAGE STRUCTURE LS 1.0

20 20 IA CS-051 CMP INLET - 12"Ø LF 20.0

21 21 IA CS-051 CMP OUTLET - 15"Ø LF 40.0

22 22 IA CS-051 CMP OUTLET - 18'Ø LF 20.0

23 23 IA CS-061 RIPRAP (IA DOT CLASS E) TN 1,082.0

24 24 IA CS-062 CONCRETE GROUT CY 12.0

25 25 IA CS-051 36" ALUMINUM CMP RISER INLET LS 1.0

26 26 IA CS -051 15" ALUMINUM CMP RISER INLET LS 1.0

27 27 SUDAS

9040.2.17

TURF REINFORCEMENT MAT, TRM (SUDAS TYPE 4) SY 1,045.0

28 28 IA CS-061 EROSION CONTROL CHECK DAMS EA 3.0

CONSTRUCTION NOTES:

1. BID ITEM FOR STRIPPING SHALL INCLUDE REMOVAL OF THE FIRST 12" OF TOPSOIL MATERIAL BELOW THE BERM, WETLAND

GRADING, CHANNEL AREA, SUBMERGED BERMS, SPILLWAYS, AND RIFFLE AREA (ESTIMATED STRIPPING QUANTITY IS 28,003 C.Y.). THE TOPSOIL MATERIAL SHALL BE STOCKPILED ON-SITE FOR RESPREAD, WHICH IS INCLUDED IN A SEPARATE BID ITEM.

WASTE MATERIAL SHALL BE DISPOSED OF ON-SITE AT DESIGNATED AREAS, DESCRIBED IN "BIDDING NOTES".

2. CROP DAMAGES WILL BE A PASS-THROUGH COST BY THE CONTRACTOR TO THE LANDOWNER. ENGINEER WILL MEASURE THIS AREA AND IDALS WILL AGREE WITH THE LANDOWNER ON A UNIT COST DURING CONSTRUCTION. BID ITEM FOR CROP DAMAGE SHALL INCLUDE AREA OF CROPS DAMAGED, AS NECESSARY, IN ORDER TO COMPLETE THE WORK AS DETAILED. CONTRACTOR

SHALL MINIMIZE CROP DAMAGE AS MUCH AS POSSIBLE DURING CONSTRUCTION ACTIVITIES.

3. BID ITEM FOR STRUCTURE SEEDING SHALL CONSIST OF SEEDING, MULCHING, AND FERTILIZING ALL STRUCTURES, EMBANKMENTS, AND ALL OTHER DISTURBED AREAS (OUTSIDE OF POOL AREA), AS INDICATED ON THE DRAWINGS OR OTHERWISE DESIGNATED. SEED MIX SHALL BE APPROVED BY ENGINEER AT LEAST 2 WEEKS BEFORE PLANNED SEEDING.

4. BID ITEM FOR BUFFER SEEDING SHALL CONSIST OF SEEDING THE AREAS DESIGNATED ON THE PLANS AS BUFFER SEEDING AND INCLUDE BORROW AREAS, DISTURBED AREAS NOT SEEDED AS PART OF STRUCTURAL SEEDING, AND OTHER AREAS WITHIN THE EASEMENT. SEED MIX SHALL BE APPROVED BY ENGINEER AT LEAST 2 WEEKS BEFORE PLANNED SEEDING.

5. BID ITEM FOR MOBILIZATION & DEMOBILIZATION SHALL INCLUDE THE SUPPLY OF ALL LABOR, MATERIAL AND EQUIPMENT TO TRANSPORT ALL NEEDED LABOR, MATERIAL AND EQUIPMENT, TO AND FROM THE PROJECT SITE, TO SUCCESSFULLY COMPLETE THE PROJECT AS SHOWN ON THE PLANS. ANY ADDITIONAL MOBILIZATION OF MANPOWER, EQUIPMENT, OR MATERIALS REQUIRED TO COMPLETE THE PROJECT SHALL BE PROVIDED BY THE CONTRACTOR AT NO ADDITIONAL EXPENSE.

ANY AND ALL WORK NEEDED TO PROVIDE ACCESS TO THE SITE TO COMPLETE CONSTRUCTION ACTIVITIES SHALL BE INCLUDED WITHIN THIS BID ITEM. THIS WORK SHALL ALSO INCLUDE RESTORATION OF THE ACCESS ROUTES UPON

CONSTRUCTION COMPLETION.

6. BID ITEM FOR DRAINAGE TILE INVESTIGATION SHALL CONSIST OF INVESTIGATION, LOCATION, REPAIR, REMOVAL AND/OR CAPPING/PLUGGING OF SUBSURFACE DRAINS (TILE) IN WETLAND RESTORATION AREA, ENHANCEMENT, OR CREATION PROJECT AREAS, OR OTHER SITUATIONS WHERE SUBSURFACE DRAINS MAY BE PRESENT. THIS BID ITEM DOES NOT INCLUDE INSTALLATION OF NEW TILE, WHICH IS INCLUDED IN SEPARATE LINE ITEMS. CONTRACTOR SHALL LOOK FOR EVIDENCE OF TILE DURING EXCAVATION OF THE CORE TRENCH, AS WELL AS DURING EXCAVATION OF THE POOL AREAS. ANY TILE FOUND SHALL BE PLUGGED TO ENSURE THEY ARE NON-FUNCTIONAL, IN ACCORDANCE WITH THE PROJECT SPECIFICATIONS.

7. BID ITEM FOR STEEL SHEET PILING SHALL CONSIST OF FURNISHING AND DRIVING THE SPECIFIED SHEET PILING AT THE LOCATION SHOWN ON THE DRAWINGS. THIS BID ITEM SHALL INCLUDE SHEET PILING CAP AND ALL OTHER LABOR AND MATERIALS NECESSARY TO PROVIDE A COMPLETE INSTALLATION. SHOP DRAWINGS SHALL BE REQUIRED FOR SHEET PILE

STRUCTURE.

8. BID ITEM FOR EXCAVATION (GENERAL) SHALL CONSIST OF EXCAVATION AND GRADING OF MATERIAL NEEDED FOR THE BERM CORE TRENCH, SEDIMENTATION BASIN, INLET/OUTLET CHANNELS, WETLAND GRADING, SPILLWAYS, RIFFLE AREA, AND

CHANNEL BEYOND THE INTIAL 12" OF TOPSOIL STRIPPING.

9. BID ITEM FOR EARTHFILL (GENERAL) SHALL CONSIST OF THE EARTHFILL NECESSARY TO CONSTRUCT THE SUBMERGED BERMS, SPILLWAYS, RIFFLE AREA, AND CHANNEL FILL. COHESIVE MATERIAL FOUND DURING GENERAL EXCAVATION CAN BE USED FOR

THESE AREAS. SAND AND GRAVEL FOUND ON SITE SHALL NOT BE USED FOR THIS EARTHFILL.

10. BID ITEM FOR EARTHFILL (GENERAL DAM) SHALL CONSIST OF EXCAVATING, PLACING, AND COMPACTING EARTHFILL NECESSARY TO CONSTRUCT THE PORTION OF THE EMBANKMENT THAT IS NOT CONSIDERED PART OF THE EMBANKMENT CORE.

COHESIVE MATERIAL FOUND DURING GENERAL EXCAVATION CAN BE USED FOR THIS AREA. SAND AND GRAVEL FOUND ON

SITE SHALL NOT BE USED FOR FILL FOR THIS ITEM.

11. BID ITEM FOR EARTHFILL (DAM CORE) SHALL CONSIST OF EXCAVATING, PLACING, AND COMPACTING EARTHFILL NECESSARY TO CONSTRUCT THE PORTION OF THE EMBANKMENT DESIGNATED THE EMBANKEMENT CORE, INCLUDING THE CORE TRENCH.

COHESIVE MATERIAL TAKEN FROM THE DESIGNATED BORROW AREA SHOULD BE USED FOR THIS AREA (NORTHERN MOST WETLAND POTHOLE LOCATION, OR OTHER AS APPROVED BY ENGINEER). ESTIMATED PLAN VALUE INCLUDES 25% SHRINKAGE

FACTOR.

12. BID ITEM FOR DRAINFILL (SAND) SHALL CONSIST OF FURNISHING AND PLACING DRAINFILL REQUIRED IN THE CONSTRUCTION OF STRUCTURE DRAINAGE SYSTEMS AND FILTER DIAPHRAGMS AROUND CONDUITS. THIS ITEM WILL CONSIST OF THE EXCAVATION NECESSARY TO CONSTRUCT THE TOE DRAINS, INCLUDING BACKFILL WITH MATERIAL MEETING THE REQUIREMENTS OF FINE DRAINFILL. GRADATIONS SHALL BE PROVIDED TO ENGINEER PRIOR TO ARRIVING ON-SITE.

13. BID ITEM FOR FILTER DIAPHRAGM SHALL CONSIST OF FURNISHING AND PLACING ALL MATERIAL REQUIRED IN THE CONSTRUCTION OF FILTER DIAPHRAGM AROUND CONDUITS. THIS ITEM WILL CONSIST OF THE EXCAVATION NECESSARY TO CONSTRUCT THE FILTER, INCLUDING BACKFILLING WITH FILTER GRAVEL (40 TON) OF IA DOT GRADATION 1 SAND MEETING

4110, AND (5 TON) OF IA DOT GRADATION 6 - 3/8" CHIP.

14. BID ITEM FOR TOPSOIL PLACEMENT SHALL CONSIST OF SPREADING SALVAGED AND STOCKPILED TOPSOIL AS THE SURFACE LAYER OF ALL EXCAVATIONS AND EARTHFILLS THAT WILL BE SEEDED. TOPSOIL SHALL BE PLACED AS THE FINAL LIFT. AREAS TO RECEIVE A MINIMUM OF 6" LAYER OF TOPSOIL INCLUDE AREAS OF THE EMBANKMENT THAT DO NOT HAVE RIPRAP, BORROW AREA, AND ADDITIONAL FILL PLACED OVER NEW TILE. 6" THICK TOPSOIL SHALL BE RE-SPREAD OVER THE EXCAVATED AREAS

WITHIN THE POOL & CHANNEL.

15. BID ITEM FOR 12"Ø HDPE DUAL-WALL SHALL CONSIST OF FURNISHING AND INSTALLING 12-INCH, NON-PERFORATED, HDPE, DUAL-WALL CORRUGATED POLYETHYLENE TUBING USED AS A DRAIN TILE AS SHOWN ON THE DRAWINGS. MEASUREMENT AND PAYMENT FOR 12-INCH NON-PERFORATED DUAL-WALL POLYETHYLENE TUBING SHALL BE ON AN INSTALLED LINEAR FOOT BASIS, AND SHALL INCLUDE ALL NECESSARY FITTINGS AND ADAPTERS. - A 20' LENGTH OF 15"Ø GALVANIZED CMP SHALL BE UTILIZED AT THE EXPOSED DOWNSTREAM OUTLETS OF THE TILE (TWO LOCATIONS). THE METAL OUTLETS SHALL BE PAID UNDER A SEPARATE BID ITEM (SEE NOTE 21). THIS BID ITEM SHALL INCLUDE FURNISHING/INSTALLING THE ANTI-SEEP COLLAR AROUND THE 12" PIPE AT THE BERM. - A 20' LENGTH OF 12"Ø GALVANIZED CMP SHALL BE UTILIZED AT THE EXPOSED UPSTREAM INLET OF THE TILE (ONE LOCATION). THE METAL INLET SHALL BE PAID UNDER A SEPARATE BID ITEM (SEE NOTE 20).

16. BID ITEM FOR 15"Ø HDPE DUAL-WALL SHALL CONSIST OF FURNISHING AND INSTALLING 15-INCH, NON-PERFORATED, HDPE, DUAL-WALL CORRUGATED POLYETHYLENE TUBING USED AS A DRAIN TILE AS SHOWN ON THE DRAWINGS. MEASUREMENT AND PAYMENT FOR 15-INCH NON-PERFORATED DUAL-WALL POLYETHYLENE TUBING SHALL BE ON AN INSTALLED LINEAR FOOT BASIS, AND SHALL INCLUDE ALL NECESSARY FITTINGS AND ADAPTERS. A 20' LENGTH OF 18"Ø GALVANIZED CMP SHALL BE UTILIZED AT THE EXPOSED DOWNSTREAM OUTLET OF THE TILE. THE METAL OUTLETS SHALL BE PAID UNDER A SEPARATE BID

ITEM (SEE NOTE 22).

17. BID ITEM FOR ALUMINUM WATER CONTROL STRUCTURE SHALL CONSIST OF PROVIDING AND INSTALLING THE ALUMINUM DRAW DOWN STRUCTURE, STOP LOGS, AND CONCRETE BASE AS SHOWN ON THE DRAWINGS AND DETAIL SHEETS. THE WCS SHALL BE FROM WISCONSIN FLOWGATE, OR APPROVED EQUAL. SHOP DRAWINGS SHALL BE APPROVED BY ENGINEER PRIOR

TO FABRICATION.

18. BID ITEM FOR ALUMINUM CMP DRAWDOWN PIPE SHALL CONSIST OF PROVIDING AND INSTALLING THE 15-INCH DIAMETER

CMP INLET AND OUTLET PIPES AS SHOWN ON THE DRAWINGS.

19. THE BID ITEM FOR STOPLOG STORAGE BOX SHALL INCLUDE ALL LABOR AND MATERIALS TO PROVIDE THE STOPLOG STORAGE BOX, AS DETAILED IN THE PLANS. EXACT LOCATION SHALL BE DETERMINED IN THE FIELD WITH APPROVAL FROM ENGINEER.

20. BID ITEM FOR CMP INLET 12"Ø SHALL CONSIST OF FURNISHING AND INSTALLING THE 12"Ø CMP AND FITTINGS SHOWN ON THE PLANS FOR THE INLET (1 LOCATION), INCLUDING ANIMAL GUARD AT INLET END OF PIPE. SEE NOTE 15.

21. BID ITEM FOR CMP OUTLET - 15"Ø SHALL CONSIST OF FURNISHING AND INSTALLING THE 15"Ø CMP AND FITTINGS SHOWN ON THE PLANS FOR TILE OUTLETS, INCLUDING ANIMAL GUARD AT OUTLET END OF PIPE (SEE NOTE 15).

22. BID ITEM FOR CMP OUTLET - 18"Ø SHALL CONSIST OF FURNISHING AND INSTALLING THE 18"Ø CMP AND FITTINGS SHOWN ON THE PLANS FOR TILE OUTLETS, INCLUDING ANIMAL GUARD AT OUTLET END OF PIPE (SEE NOTE 16).

23. BID ITEM FOR RIPRAP (IA DOT CLASS E) SHALL CONSIST OF FURNISHING AND PLACING THE ROCK RIPRAP IN THE LOCATIONS AS SHOWN ON THE DRAWINGS. ROCK SHALL BE CLASS E REVETMENT STONE AS DEFINED BY IOWA DEPARTMENT OF TRANSPORTATION. NON-WOVEN FILTER FABRIC IS REQUIRED BENEATH ALL ROCK/RIPRAP AND SHALL BE SECURED TO SLOPES AND BOTTOM, USING PINS, AS NOTED IN THE SPECIFICATIONS. QUANTITY IS BASED ON TONS. CONTRACTOR SHALL PROVIDE SCALE TICKETS WITH WEIGHTS INCLUDING TARE WEIGHTS, GROSS WEIGHTS, AND NET WEIGHTS OF MATERIAL DELIVERED.

CONTRACTOR SHALL PROVIDE GRADATIONS TO ENGINEER PRIOR TO RIPRAP ARRIVING ON-SITE.

24. BID ITEM FOR CONCRETE GROUT SHALL CONSIST OF FURNISHING AND PLACING CONCRETE GROUT ON THOSE PORTIONS OF THE RIPRAP SHOWN ON THE DRAWINGS. GROUT FILL QUANTITY IS BASED ON AN APPLICATION RATE OF 0.6FT3/FT2 OF RIPRAP.

WHITE PIGMENTED CURE SHALL BE APPLIED AND IS INCIDENTAL TO THIS BID ITEM.

25. BID ITEM FOR 36"Ø ALUMINUM CMP RISER INLET SHALL CONSIST OF PROVIDING AND INSTALLING THE 36-INCH DIAMETER CMP RISER IN WETLAND AS SHOWN ON THE DRAWINGS. SHOP DRAWINGS SHALL BE APPROVED BY ENGINEER PRIOR TO

FABRICATION.

26. BID ITEM FOR 15"Ø ALUMINUM CMP RISER INLET SHALL CONSIST OF PROVIDING AND INSTALLING THE 15-INCH DIAMETER CMP RISER IN WETLAND AS SHOWN ON THE DRAWINGS. SHOP DRAWINGS SHALL BE APPROVED BY ENGINEER PRIOR TO

FABRICATION.

27. BID ITEM SHALL CONSIST OF FURNISHING AND PLACING TURF REINFORCEMENT MAT SUDAS TYPE 4 TRM PER SECTION 9040

2.17 AND INSTALLATION TO MANUFACTURER'S RECOMMONDATIONS. TRM SHALL BE PROPEX ARMORMAX 75 OR APPROVED

EQUAL.

28. BID ITEM FOR EROSION CONTROL CHECK DAMS SHALL CONSIST OF FURNISHING AND PLACING THE ROCK IN THE LOCATIONS

AS SHOWN ON THE DRAWINGS.

29. DEWATERING AND WATER MAINTENANCE IS THE CONTRACTOR'S RESPONSIBILITY, AND IS CONSIDERED INCIDENTAL TO THE

PROJECT.

NRCS SPECIFICATIONS:

IA CS-001 SITE PREPARATION

IA CS-005 POLLUTION CONTROL

IA CS-006 SEEDING AND MULCHING FOR PROTECTIVE COVER

CS-008 MOBILIZATION & DEMOBILIZATION

IA CS-009 SUBSURFACE DRAIN INVESTIGATION, REMOVAL, AND REPAIR

IA CS-011 REMOVAL OF WATER

IA CS-013 SHEET PILING

IA CS-021 EXCAVATION

IA CS-023 EARTHFILL

IA CS-024 DRAINFILL (SAND)

IA CS-026 TOPSOILING

IA CS-031 CONCRETE

IA CS-046 TILE DRAINS FOR LAND DRAINAGE

IA CS-051 CORRUGATED METAL PIPE CONDUITS

IA CS-061 LOOSE ROCK RIPRAP

IA CS-062 CONCRETE GROUT FOR RIPRAP

IA CS-081 METAL FABRICATION AND INSTALLATION

IA CS-095 GEOTEXTILE

SUDAS 9040 2.17 TURF REINFORCEMENT MAT, TRM

ADDITIONAL NOTES:

1. THE PROJECT SPECIFICATIONS ARE FROM NRCS FOR THE STATE OF IOWA ADAPTED BY IDALS/DU.

2. ALL APPLICABLE FEDERAL, STATE, AND LOCAL LAWS AND ORDINANCES WILL BE COMPLIED WITH IN

THE CONSTRUCTION OF THIS PROJECT.

3. USDA, IDALS, AND DU DO NOT GUARANTEE THE WETLAND WILL FILL OR REMAIN FILLED WITH WATER

TO THE PRINCIPAL CREST ELEVATION.

4. IF CULTURAL RESOURCE IS IDENTIFIED DURING CONSTRUCTION, STOP IMMEDIATELY AND NOTIFY

ENGINEER AND IDALS.

5. PRODUCT DATA SHEETS SHALL BE PROVIDED FOR ALL BID ITEM MATERIALS, AS WELL AS ANY OTHER

MATERIALS, AS REQUESTED BY THE ENGINEER.

6. NO ACTIVITY WILL BE AUTHORIZED WHICH JEOPARDIZES THE CONTINUED EXISTENCE OF A

THREATENED OR ENDANGERED SPECIES OR A SPECIES PROPOSED FOR SUCH DESIGNATION, AS

INDENTIFIED UNDER THE FEDERAL ENDANGERED SPECIES ACT, OR WILL DESTROY OR ADVERSELY MODIFY THE CRITCIAL HABITAT OF SUCH A SPECIES. THE ENGINEER WILL CONSULT WITH A QUALIFIED

BIOLOGIST IF SUCH A SITUATION IS BELIEVED TO EXIST ONSITE AND A COURSE OF ACTION

DETERMINED. EXISTING EAGLE NESTS WILL BE PROVIDED WITH A 660' BUFFER ZONE UNLESS

OTHERWISE INDICATED BY THE NATIONAL BALD EAGLE MANAGEMENT GUIDELINES PUBLISHED BY THE

US FISH AND WILDLIFE SERVICE MAY 2007.

7. TO PROTECT THREATEND/ENDANGERED BATS, TREES SHALL BE REMOVED IN ACCORDANCE WITH IOWA DOT ARTICLE 2101.10 BETWEEN OCTOBER 1ST AND MARCH 31ST. TREE FELLING IN THAT TIME WILL ONLY REQUIRE TREES 3" IN DIAMETER AND LARGER TO BE CUT 3 TO 4 FEET ABOVE GROUND LINE. THE CONTRACTOR SHALL LIMIT REMOVAL OF FOREST COVER TO THOSE AREAS WHICH ARE NECESSARY FOR

THE CONSTRUCTION OF THE WORK AND AS DIRECTED BY THE ENGINEER.

8. IF SAND IS FOUND DURING EXCAVATION THE ENGINEER MUST BE NOTIFIED IMMEDIATELY TO DETERMINE NECESSARY REMEDIATION ACTIONS. WORK IN THE AREA WHERE SAND IS IDENTIFIED

SHALL BE POSTPONED UNTIL A COURSE OF ACTION CAN BE DETERMINED.

9. ALL WORK SHALL BE COMPLETED PER NRCS SPECIFICATIONS. IF REQUIRED WORK IS NOT INCLUDED IN NRCS SPECIFICATIONS, WORK SHALL CONFORM TO THE CURRENT EDITION OF THE IOWA STATEWIDE

URBAN DESIGN AND SPECIFICATIONS (SUDAS).

10. THE VOLUMES AND QUANTITIES AS PROVIDED ARE ESTIMATED FROM TOPOGRAPHIC INFORMATION, ACQUIRED FROM MULTIPLE SOURCES, USING A COMPUTER PROGRAM. PAYMENT WILL BE MADE BASED ON PLAN QUANTITIES UNLESS OTHERWISE NOTED OR ADDITIONAL EXCAVATION IS DIRECTED BY THE

ENGINEER. EXCAVATION RESULTING FROM THE CONTRACTOR'S IMPROPER CONSTRUCTION

OPERATIONS, SITE CONDITIONS, OR OTHERWISE, WILL NOT BE INCLUDED FOR MEASUREMENT AND

PAYMENT.

BIDDING NOTES:

1. BORROW EXCAVATION: 7,855 C.Y. (INCIDENTAL TO BID ITEM NO. 8 & NO. 11) (REFERENCE IA CS-021 & IA CS-023)

2. FILL BORROW PIT WITH EXCESS TOPSOIL: 7,855 C.Y. (INCIDENTAL TO BID ITEM NO. 1) (REFERENCE IA CS-001 3.0

STRIPPED MATERIAL DISPOSAL)

3. FILL GRAVEL PIT WITH EXCESS TOPSOIL: 6,754 C.Y. (INCIDENTAL TO BID ITEM NO. 1) (REFERENCE IA CS-001 3.0

STRIPPED MATERIAL DISPOSAL)

EXISTING GRAVEL

& SAND PIT

K E LIVESTOCK &

GRAVEL INC

GIESE FAMILY

FARMS INC

DAPEMA LLC

SIMPSON, BARRYDAPEMA LLC

SABIN FAMILY

FARMS LLC

SABIN FAMILY

FARMS LLC

GIESE FAMILY

FARMS INC

GIESE FAMILY

FARMS INC

R & L ROCHLEAU

FARMS LLC

TEST PIT #3

TEST PIT #7

TEST PIT #4

TEST PIT #9

TEST PIT #2

TEST PIT #5

TEST PIT #6

TEST PIT #8

TEST PIT #1

CP 1

CP 3

CP 4

FLOW

12001

6'X6' RCB

INV. ELEV: 1112.29

12015

6'X6' RCB

INV. ELEV: 1112.83

18164

6'X6' RCB

INV. ELEV: 1123.24

18165

6'X6' RCB

INV. ELEV: 1123.23

18166

6'X6' RCB

INV. ELEV: 1123.30

18167

6'X6' RCB

INV. ELEV: 1123.33

LEGEND

CHANNEL

DITCH

SPOT ELEVATION

HORIZONTAL &

VERTICAL CONTROL

MAJOR CONTOUR

MINOR CONTOUR

ROAD OR TRAIL

APPROXIMATE

PROPERTY LINE

SOIL BORING

March 2, 2023

US-IA-340-11, Kossuth County - Manske

HORIZONTAL CONTROL

Coordinates are NAD 83, Iowa State Plane North Zone 1401, and units of measurement are in U.S. Survey Feet. Raw data was collected for 10.5 hours on March 02, 2023 using a Trimble R12 GPS base receiver. Coordinates are established with the NGS OPUS (National Geodetic Survey, Online Positioning User Service) solution for the occupied control point 1.

VERTICAL CONTROL

Elevations established from with the NGS OPUS solution for the occupied control point number 1. Vertical Datum was observed in NAVD 88, using GEOID18.

ONSITE CONTROL, HORIZONTAL AND VERTICAL

Control Point 1 - Set capped rebar N: 3829631.59 E: 4726585.33

ELEV: 1130.22

March 1, 2023 - DU started topographic survey of bottomland areas.

March 2, 2023 - DU performed the remaining topographic survey including linework from the culvert on 170th Street to the Des Moines River and linework around existing wetlands. Some topographic survey completed within the oxbow area.

March 7, 2023 - DU performed topographic survey within the oxbow area and line work around the oxbow and along the Des Moines River. Additional topographic survey was completed in the swale from 120th to the March 1, 2023 topographic survey.

LIDAR was used to fill in areas not covered by the topographic survey.

CONTROL POINT DATA

POINT #

ELEVATION

1130.22

1134.74

1100.89

NORTH

3829631.59

3829710.23

3828257.43

EAST

4726585.33

4724723.11

4724734.83

DESCRIPTION

SET CAPPED REBAR

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GRAPHIC SCALE

1 inch = feet200

200 0 100 200 400 800

170TH ST

U .S

EAST FORK DES MOINES RIVER

R ev is io ns B y

D at e

REVIEWER:

DRAWN BY:

SURVEYED BY:

PROJECT NUMBER:

DATE:

CAD FILE:

R ev is io n S he et

AFFIX SEAL: DUCKS UNLIMITED, INC.

ON:

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C051

04-28-2025

T.P.

A.B. & A.S.

M.L.H.

A.S.

IA-340-11 MANSKE C051 - TOPO

SURVEY - MLH

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US-IA-340-11

-2

N A L

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S A .S

CONSTRUCTION ACCESS

TEST PIT SOIL DATA

AutoCAD SHX Text

LOCATION

AutoCAD SHX Text

TRENCH #1

AutoCAD SHX Text

TRENCH #2

AutoCAD SHX Text

TRENCH #3

AutoCAD SHX Text

TRENCH #4

AutoCAD SHX Text

TRENCH #5

AutoCAD SHX Text

TOP

AutoCAD SHX Text

TOPSOIL W/ 16" ROOT ZONE

AutoCAD SHX Text

TOPSOIL W/ 12" ROOT ZONE

AutoCAD SHX Text

TOPSOIL W/ 12" ROOT ZONE

AutoCAD SHX Text

18" TOPSOIL

AutoCAD SHX Text

TOPSOIL MIX /DEPOSITS 6"-10" ROOT ZONE

AutoCAD SHX Text

ELEV. RANGE

AutoCAD SHX Text 1102.51-1104.24

AutoCAD SHX Text 1097.65-1100.60

AutoCAD SHX Text 1099.30-1100.03

AutoCAD SHX Text 1099.20-1100.40

AutoCAD SHX Text 1099.30-1100.86

AutoCAD SHX Text

MIDDLE

AutoCAD SHX Text

DARK BROWN SOIL/SILT (BREAKS APART W/ ADDED WATER)

AutoCAD SHX Text

LIGHT BROWN CLAY MIX

AutoCAD SHX Text

DARK BROWN SOIL/CLAY, DRY BUT COHESIVE WITH ADDED WATER

AutoCAD SHX Text

DARK BROWN TOPSOIL TRANSITION

AutoCAD SHX Text

BROWN TOPSOIL W/SAND & GRIT

AutoCAD SHX Text

ELEV. RANGE

AutoCAD SHX Text 1099.37-1102.51

AutoCAD SHX Text 1093.21-1097.65

AutoCAD SHX Text 1096.07-1099.30

AutoCAD SHX Text 1097.26-1099.20

AutoCAD SHX Text 1096.32-1099.30

AutoCAD SHX Text

BOTTOM

AutoCAD SHX Text

SANDY BROWN SOIL

AutoCAD SHX Text

BLUE CLAY W/ SAND

AutoCAD SHX Text

DARK BROWN/GREY CLAY

AutoCAD SHX Text

DARK BROWN COHESIVE SOIL

AutoCAD SHX Text

LIGHTER BROWN SOIL W/ MORE SAND CONTENT

AutoCAD SHX Text

ELEV. RANGE

AutoCAD SHX Text 1096.11-1099.37

AutoCAD SHX Text 1091.83-1093.21

AutoCAD SHX Text 1093.03-1096.07

AutoCAD SHX Text 1092.56-1097.26

AutoCAD SHX Text 1094.02-1096.32

AutoCAD SHX Text

LOCATION

AutoCAD SHX Text

TRENCH #6

AutoCAD SHX Text

TRENCH #7

AutoCAD SHX Text

TRENCH #8

AutoCAD SHX Text

TRENCH #9

AutoCAD SHX Text

TOP

AutoCAD SHX Text

TOPSOIL MIX W/ DEPOSITS

AutoCAD SHX Text

TOPSOIL W/ 12" ROOT ZONE

AutoCAD SHX Text

TOPSOIL MIX W/ DEPOSITS

AutoCAD SHX Text

TOPSOIL W/ FIBER DEPOSITS 12-16" ROOT ZONE

AutoCAD SHX Text

ELEV. RANGE

AutoCAD SHX Text 1094.22-1094.95

AutoCAD SHX Text 1095.94-1100.01

AutoCAD SHX Text 1094.37-1095.57

AutoCAD SHX Text 1098.99-1101.53

AutoCAD SHX Text

MIDDLE

AutoCAD SHX Text

MINIMAL TRANSITION

AutoCAD SHX Text

DARK BROWN TOPSOIL W/ COHESIVE MATERIAL

AutoCAD SHX Text

DARK BROWN MIX CLAY/SILT/ TOPSOIL COHESIVE

AutoCAD SHX Text

DARK BROWN CLAY

AutoCAD SHX Text

ELEV. RANGE

AutoCAD SHX Text N/A

AutoCAD SHX Text 1093.07-1095.94

AutoCAD SHX Text 1093.15-1094.37

AutoCAD SHX Text 1094.71-1098.99

AutoCAD SHX Text

BOTTOM

AutoCAD SHX Text

DARK BROWN MIX CLAY/SILT/ TOPSOIL COHESIVE

AutoCAD SHX Text

DARK BROWN/GREY CLAY MATERIAL

AutoCAD SHX Text

DARK GREY WET CLAY W/ SOME SAND

AutoCAD SHX Text

LIGHT BROWN CLAY

AutoCAD SHX Text

ELEV. RANGE

AutoCAD SHX Text 1090.07-1094.22

AutoCAD SHX Text 1091.26-1093.07

AutoCAD SHX Text 1090.58-1093.15

1093.49-1094.71

EXISTING GRAVEL

& SAND PIT

K E LIVESTOCK &

GRAVEL INC

GIESE FAMILY

FARMS INC

DAPEMA LLC

SABIN FAMILY

FARMS LLC

SABIN FAMILY

FARMS LLC

GIESE FAMILY

FARMS INC

GIESE FAMILY

FARMS INC

CP 3

CP 4

FLOW

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T O

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F D

U C K S U

D U

C K S U

M A K

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F A N

Y K

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T O

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H E

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F O

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A R E

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F A L

P R O

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N A L

A R C H

T, L

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D S C A

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U R V

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W A Y.

I F

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G T

H E

M P

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A L

P R O

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N A L

E A

G E

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A R C H

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D S C A

A R C H

T O

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U R V

O R S

H A

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T A N

D I

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F O

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R S

R E, T H

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N O

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T R

U C

GRAPHIC SCALE

1 inch = feet150

150 0 75 150 300 600

LEGEND

APPROXIMATE PROPERTY LINE

PROPOSED DIKE

PROPOSED CHANNEL/DITCH

PROPOSED MAJOR CONTOUR

PROPOSED MINOR CONTOUR

PROPOSED PIPE

(000)

PROPOSED SOIL BORING

PROPOSED FULL SERVICE LEVEL (FSL)

PROPOSED SPOIL AREA

PROPOSED BORROW AREA

PROPOSED PAVING AND DIKE

SURFACING

PROPOSED RIPRAP

0.00 PROPOSED SPOT ELEVATION

SB1

PROPOSED LIMITS OF DISTURBANCELOD

PROPOSED LIMITS OF CONSTRUCTIONLOC

20' WIDE RIPRAP

SPILLWAY; TOP OF

RIPRAP ELEV. 1099.0'

30' WIDE AUXILIARY SPILLWAY WITH

TRM & RIPRAP OUTLET CHANNEL

BERM W/ 12' WIDE TOP, 6:1 SIDE

SLOPES, AND TYP. TOP ELEV. 1103.75'

SUBMERGED BERM; TOP OF BERM ELEV. 1101.2'

W/ 10' WIDE TOPS AND 6:1 SIDE SLOPES

BERM SLOPES UP AT THIS

SECTION TO END STATION

RIPRAP RIFFLE DIVERSION IN EXISTING

CREEK; DIVERSION STRUCTURE TO 15"Ø

HDPE DUAL-WALL PIPE TO WETLAND;

PIPE INVERT 1103.3'

15"Ø HDPE DUAL-WALL OUTLET

TO WETLAND CHANNEL

OUTLET INVERT ELEV. 1102.7'

SHEET PILE WEIR AT 1101.7'; STILLING

BASIN DOWNSTREAM OF WEIR ROUTES TO

EXISTING OXBOW VIA CHANNEL

EXISTING OXBOW

NWL = 1099.0' @

3.14 ACRES

20' WIDE CHANNEL THROUGH

WETLAND; FIRST 12" TOPSOIL TO

BE RE-SPREAD OUTSIDE OF

FLOODPLAIN AREA. REMAINING

MATERIAL TO BE USED FOR BERM

CONSTRUCTION.

EXCAVATE CHANNEL

FROM OXBOW TO

SPILLWAY 20' WIDE

W/ 3:1 SIDE SLOPES

EXISTING WETLAND NWL

ELEV. 1099.0' @ 0.84 ACRES

15"Ø RISER INTAKE TO 12"Ø HDPE DUAL-WALL PIPE TO

EXISTING WETLAND; RISER RIM ELEV. 1101.7'; MAY

REQUIRED SHALLOW SCRAPING FROM PIPE OUTLET TO

EXISTING WETLAND TO ROUTE WATER.

WETLAND NWL ELEV. 1101.7';

APPROXAIMTELY 27.576 ACRES

WITH AVERAGE DEPTH OF 1.5

FEET.

12"Ø HDPE DUAL-WALL OUTLET PIPE TO

RIVER; OUTLET INVERT ELEV. 1096.0'

(VERIFY WITH RIVER TOE); PROVIDE

FLAP GATE AT PIPE END

FLOW

FLO

EAST FORK DES MOINES RIVER

FLOW

FEMA 100-YEAR FLOOD ELEVATION

APPROXIMATELY 1104.44'

DESIGN CRITERIA

DESIGN CRITERIA VALUE UNIT REQUIREMENT/

NOTES

CONTRIBUTING SURFACE WATERSHED AREA 64.0 ACRES

CONTRIBUTING SUBSURFACE WATERSHED AREA 1154.9 ACRES

POOL NORMAL WATER LEVEL (NWL) ELEVATION 1101.7 FT.

DESIGNED WETLAND POOL AREA (@ NWL) 27.576 ACRES

PERCENT POOL AREA TO WATERSHED AREA 2.4 % >=0.50%

MAX. POOL DEPTH 2.9 FT.

AVG. POOL DEPTH 1.5 FT.

DEEP WATER AREA (DEPTH >3 FT) 0.0 ACRES <25%

PERCENT DEEP WATER TO POOL AREA 0 %

POOL STORAGE VOLUME AT NWL 42.079 ACRE-FT

BERM ELEVATION 1103.75 FT. *STEPS UP

POOL STORAGE VOLUME AT TOP OF BERM 104.439 ACRE-FT

MAX BERM HEIGHT (TO EXISTING GRADE) 4.25 FT.

AVG. BERM HEIGHT 2.88 FT. TO E.G.

BERM LENGTH 4,324 FT.

PRINCIPLE WEIR ELEVATION 1101.7 FT.

PRINCIPLE WEIR LENGTH 20.0 FT.

AUXILIARY SPILLWAY ELEVATION 1102.30 FT. 30' WIDE

5-YEAR STORM HWL IN POOL 1102.19 FT.

5-YEAR PEAK INFLOW 186.53 CFS

5-YEAR PEAK OUTFLOW 26.38 CFS

10-YEAR STORM HWL IN POOL 1102.30 FT.

10-YEAR PEAK INFLOW 228.97 CFS

10-YEAR PEAK OUTFLOW 34.65 CFS

25-YEAR STORM HWL IN POOL 1102.46 FT.

25-YEAR PEAK INFLOW 297.61 CFS

25-YEAR PEAK OUTFLOW 53.94 CFS

FEMA 100-YEAR FLOOD ELEVATION (NAVD88) 1104.44 FT. APPROXIMATE

ALUMINUM CMP WATER

CONTROL STRUCTURE

SUBMERGED BERM; TOP OF BERM

ELEV. 1101.7' W/ 10' WIDE TOPS

AND 6:1 SIDE SLOPES

SUBMERGED BERM; TOP OF BERM ELEV. 1101.2'

W/ 10' WIDE TOPS AND 6:1 SIDE SLOPES

WETLAND POOL CHARACTERISTICS

WETLAND

POOL

DEPTH

ELEV.

INCREMENTAL

AREA (AC)

CUMULATIVE

VOLUME

(ACRE-FT)

0.0 1098.8 4.614 -

0.2 1099.0 5.370 4.992

1.2 1100.0 6.506 10.930

2.0 1101.0 21.631 24.999

2.9 1101.7 27.576 42.079

3.2 1102.0 28.419 50.418

4.2 1103.0 31.361 80.308

4.95 1103.75 32.988 104.439

PROPERTY LINE

NOTE:

BORROW AREAS SHALL

INCLUDE THE NORTHERN

MOST WETLAND POTHOLE

LOCATION,

GRADE TO DIVERT WATER

INTO CHANNEL/WETLAND

25-YEAR STORM BOUNCE

ELEVATION 1102.47' PROPOSED SPOIL AREA TO

STABILIZE EXISTING SAND PIT.

ESTIMATED 6,754 C. Y. TO BE

RESEEDED WITHIN 2.1 ACRES

(AVERAGE DEPTH 2')

WS PROFILE #3

WS PROFILE #2

WS PROFILE #1

EROSION CONTROL STONE

CHECK DAMS IN VALLEY

EROSION CONTROL STONE

CHECK DAMS IN VALLEY

EASEMENT BOUNDARY

EASEMENT

BOUNDARY

AFFIX SEAL: DUCKS UNLIMITED, INC.

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U se rs \m ha as e\ D uc ks

U nl im ite d In co rp or at ed \I ow a

Io w a\

3D P ro je ct s\

-3

-2

C R

P R O

\K O

S S U

A N

S K E

3D _D

R A W

\I A -3

-1

A N

S K E

A N

.d w g, /1

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CAD FILE:

DRAWN BY:

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REVIEWER:

DATE:

PROJECT NUMBER:

R ev is io ns D at e

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T.P.

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M.L.H.

A.S.

IA-340-11 MANSKE C101 - SITE

PLAN - MLH

K O

D K O

S S U

O U

A N

US-IA-340-11

-2

N A L

A N

S A .S

EXCAVATION NOTE:

IF SANDY MATERIAL IS FOUND DURING EXCAVATION, THE

ENGINEER MUST BE NOTIFIED IMMEDIATELY TO DETERMINE

NECESSARY REMEDIATION ACTIONS. WORK IN THE AREA

WHERE SAND IS IDENTIFIED SHALL BE POSTPONED UNTIL

A COURSE OF ACTION CAN BE DETERMINED.

EASEMENT BOUNDARY

0+50

0+80

BTM SHEETING

ELEV. 1087.7'

BTM SHEETING

ELEV. 1093.75'

BTM SHEETING

ELEV. 1088.75'

8.00' 2.10' 2.10'

8.00'20.00'

44.20'

52.36'

2.00' 2.00'

TOP SHEET PILING IN

SPILLWAY ELEV. 1101.7

SETTLED TOP OF

BERM ELEV. 1103.75

SETTLED TOP OF

BERM ELEV. 1103.75

BOTTOM PLUNGE

POOL ELEV. 1097.7

RIPRAP

1.5' THICK

PLACE GEOTEXTILE

FABRIC UNDER ALL RIPRAP

2:1 2:1

9' 9' 9' 9'

14' 14'

14'

14' 14' 14'14'

14'

14' 14'

TOP SHEETING

ELEV. 1102.75'

NOTE:

BERM SHALL BE OVERBUILT BY 5% (1103.9')

SO THAT THE SETTLED TOP OF BERM WILL BE 1103.75'

9' 9' 9' 9'

GRAPHIC SCALE

1 inch = feet30

30 0 15 30 60 120

N O

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T H

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F A L

P R O

S S

N A L

A R C H

T, L

A N

D S C A

A R C H

T O

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A N

D S

U R V

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A N

M I

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W A Y.

I F

A N

M B

G T

H E

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A L

P R O

S S

N A L

E A

G E

N G

A R C H

T, L

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D S C A

A R C H

T O

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A N

D S

U R V

O R S

H A

M P

D O

C U

T A N

D I

N C

D E

N O

O N

B Y"

F O

B Y

R S

R E, T H

E D

O F

S U

C H

O N

A N

D A

C R

N O

E A

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N O

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C O

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U C

PROFILE PRIMARY SPILLWAY

@BERM STA. 8+22

CROSS SECTION

PRIMARY SPILLWAY

VERTICAL SCALE

1 inch = feet

HORIZONTAL SCALE

1 inch = feet

10 205

VERTICAL SCALE

1 inch = feet

HORIZONTAL SCALE

1 inch = feet

10 205

BOTTOM STILLING

BASIN ELEV. 1097.7'

CLASS E RIPRAP

1.5' THICK

PLACE GEOTEXTILE FABRIC

UNDER ALL RIPRAP

BOTTOM OUTLET TO

OXBOW ELEV. 1095.0'

EXISTING

GROUND

BOTTOM STONE

LINED CHANNEL

ELEV. 1099.0'

TOP OF BERM

ELEV. 1103.75

TOP OF SHEET PILING AT

SPILLWAY ELEV. 1101.7'

BOTTOM OF

WATER CHANNEL

ELEV. 1099.0'

6:1 6:1

3:1

12.00'

IA DOT CLASS E RIPRAP PLACED IN

12' DIAMETER MOUND AROUND RISER

36" Ø SLOTTED ALUMINUM CMP

INTAKE RISER RIM ELEV. 1101.7'

15" Ø CMP INV. ELEV. 1099.0

48" Ø ALUMINUM CMP WCS INV. ELEV. 1099.0'

(W/ 15" Ø ALUMINUM DRAWDOWN PIPES)

15" Ø ALUMINUM DRAWDOWN PIPE

OUTLET ELEV. 1099.0'

(PROVIDE RODENT GUARD)

OXBOW NWL ELEV. 1099.0'

BOTTOM OF

SHEET PILING

ELEV. 1087.7'

FLOW

IADOT CLASS E RIPRAP

1.5' THICK

RIPRAP

1.5' THICK

SHEET PILING

CLASS E RIPRAP

GROUTED 1.5' THICK

9.00'

15.00'

9.00'

GROUTED RIPRAP

(GREY AREAS)

5.0'

9'X20' STILLING BASIN

BOTTOM ELEV. 1097.7'

FILTER DIAPHRAGM

EXCAVATE CHANNEL FROM

WETLAND TO RISER;

10' WIDE BOTTOM

W/ 3:1 SIDE SLOPES

(INCIDENTAL TO PROJECT)

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3-w w w .d uc ks

.o rg

U se rs \m ha as e\ D uc ks

U nl im ite d In co rp or at ed \I ow a

Io w a\

3D P ro je ct s\

-3

-2

C R

P R O

\K O

S S U

A N

S K E

3D _D

R A W

\I A -3

-1

A N

S K E

.d w g, /1 8/

M ic ha el H aa se

A R Y

A Y

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D O

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N on e

CAD FILE:

DRAWN BY:

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REVIEWER:

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T.P.

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M.L.H.

A.S.

IA-340-11 MANSKE C201 -

PROFILES - MLH

K O

D K O

S S U

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A R Y

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D O

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-2

N A L

A N

S A .S

200 180 160 140 120 100 80 60 40 20 0 20 40

17+50

18+00

18+50

.4 19+00

GRAPHIC SCALE

1 inch = feet20

20 0 10 20 30 60

N O

C E:

C O

N S

U C

O N

E S A

S T

H E

S O

N S

Y O

E C O

A C

D U

C K S U

S H

N O

T A S S U

M E

A N

Y R

R T

H E

S A

E W

O R K P

R M

R S O

N S E

N G

A G

N T

H E

W O

R K

R B Y

U C

R O

F O

S O

N S O

N -S

M A

L, D

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D I

R M

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I S T

H E

O F

D U

C K S U

I T

M A Y

N O

T B E

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F O

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H O

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C O

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T O

F A N

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F D

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D U

C K S U

M A K

N O

R W

A R R A N

F A N

Y K

D R

A R D

T H

L, D

A N

D I

R M

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B U

T N

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T O

E A C C U

R A C Y

O F

M A

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F A L

P R O

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N A L

A R C H

T, L

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D S C A

A R C H

T O

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A N

M I

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N Y

W A Y.

I F

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G T

H E

M P

O F

A L

P R O

S S

N A L

E A

G E

N G

A R C H

T, L

A N

D S C A

A R C H

T O

R L

A N

D S

U R V

O R S

H A

M P

D O

C U

T A N

D I

N C

D E

N O

O N

B Y"

F O

B Y

R S

R E, T H

E D

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C H

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A N

D A

C R

N O

E A

O N

N O

T F

O R

C O

N S

T R

U C

VERTICAL SCALE

1 inch = feet

HORIZONTAL SCALE

1 inch = feet

10 205

AFFIX SEAL: DUCKS UNLIMITED, INC.

ON:

G R

A N

C R

N A L

M A N

B O

V A R D

B U

A N

3-w w w .d uc ks

.o rg

U se rs \m ha as e\ D uc ks

U nl im ite d In co rp or at ed \I ow a

Io w a\

3D P ro je ct s\

-3

-2

C R

P R O

\K O

S S U

A N

S K E

3D _D

R A W

\I A -3

-1

A N

S K E

.d w g, /1 8/

M ic ha el H aa se

A U

R Y

A Y

A N

N on e

CAD FILE:

DRAWN BY:

SURVEYED BY:

REVIEWER:

DATE:

PROJECT NUMBER:

R ev is io ns D at e

B y

R ev is io n S he et

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04-28-2025

T.P.

A.B. & A.S.

M.L.H.

A.S.

IA-340-11 MANSKE C201 -

PROFILES - MLH

K O

D K O

S S U

O U

A U

R Y

A Y

A N

US-IA-340-11

-2

N A L

A N

S A .S

PROFILE AUXILIARY SPILLWAY

@ BERM STA. 18+40

VERTICAL SCALE

1 inch = feet

HORIZONTAL SCALE

1 inch = feet

10 205

CROSS SECTION

AUXILIARY SPILLWAY

CLASS E RIPRAP 1.5' THICK

TOP OF BERM ELEV. 1103.75

SPILLWAY ELEV. 1102.3

TOP OF BERM ELEV.

1103.75 SPILLWAY ELEV.

1102.3

TOP OF BERM ELEV.

1103.75

IADOT CLASS E RIPRAP

@1.5' THICK OVER

GEOTEXTILE FABRIC

SUDAS CLASS 4

TURF REINFORCEMENT MAT;