INFORMATIONAL MEETING Improvement of Judicial Ditch No. 24 Jackson - - PowerPoint PPT Presentation

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INFORMATIONAL MEETING Improvement of Judicial Ditch No. 24 Jackson - - PowerPoint PPT Presentation

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INFORMATIONAL MEETING Improvement of Judicial Ditch No. 24 Jackson County, MN June 6, 2019 Location and Scope of Improvement Location and Scope of Improvement - JD 24 Watershed - Jackson Co. Round Lake Twp. Portions of 17 Sections -

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SLIDE 1

INFORMATIONAL MEETING

Improvement of Judicial Ditch No. 24 Jackson County, MN

June 6, 2019

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SLIDE 2

Location and Scope of Improvement

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SLIDE 3

Location and Scope of Improvement

  • JD 24 Watershed
  • Jackson Co. Round Lake Twp. – Portions of 17

Sections

  • Nobles Co Indian Lake Twp. – Portions of 4 Sections
  • Total JD 24 Watershed = 8,130 Acres
  • Petition Location
  • Branch B, Branch Q, Branch S, Branch T, Branch U
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SLIDE 4

Existing Ditch System

  • Petitioned for Establishment 1913
  • Original Construction = 1917
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SLIDE 5

Capacity of Existing Drainage System

  • Analysis used Standard Engineering Methods
  • Tiles – Manning Equation
  • Recommended Standards
  • Natural Resources Conservation Service (NRCS)
  • 1/2” of runoff per day
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SLIDE 6

Capacity of Existing Drainage System

Tile Location Drainage Area (Acres) NRCS Flow (CFS) 1/2”/Day Existing Tile Size (Inches) Existing Tile Grade (%) Calculated Tile Capacity (CFS) n=0.013 Calculated Coefficient (In. Per Day) Branch B

  • Br. B2 Confluence

58 1.21 8” 0.10 0.38 0.16

  • Br. B1 Confluence

142 2.97 8” 0.10 0.38 0.06 Outlet to Open Ditch 176 3.69 8” 0.20 0.54 0.07 Branch B1 Branch B Confluence 34 0.72 6” 0.10 0.18 0.12 Branch B2 Branch B Confluence 50 1.04 8” 0.10 0.38 0.18

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SLIDE 7

Capacity of Existing Drainage System

Tile Location Drainage Area (Acres) NRCS Flow (CFS) 1/2”/Day Existing Tile Size (Inches) Existing Tile Grade (%) Calculated Tile Capacity (CFS) n=0.013 Calculated Coefficient (In. Per Day) Branch Q

  • No. of CSAH 4

184 3.87 8” 0.20 0.54 0.07

  • Br. Q5 Confluence

410 8.61 14” 0.05 1.20 0.25 20” 0.05 3.12 W ½ Sec. 20 560 11.77 14” 0.05 1.20 0.18 20” 0.05 3.12

  • Br. Q3 Confluence

662 13.91 15” 0.05 1.45 0.16 20” 0.05 3.12

  • Br. Q2 Confluence

704 14.78 15” 0.05 1.45 0.15 20” 0.05 3.12

  • Br. Q1 Confluence

718 15.09 15” 0.10 2.05 0.21 20” 0.10 4.41 Outlet to Open Ditch 795 16.71 15” 0.20 2.90 0.27 20” 0.20 6.24

  • Br. Q1

Branch Q Confluence 15 0.31 6” 0.20 0.25 0.41

  • Br. Q2

Branch Q Confluence 41 0.87 8” 0.20 0.54 0.31

  • Br. Q3

Branch Q Confluence 102 2.14 10” 0.05 0.49 0.11

  • Br. Q4

Branch Q Confluence 123 2.58 10” 0.10 0.69 0.13

  • Br. Q5

Branch Q Confluence 103 2.17 8” 0.10 0.38 0.25 10” 0.10 0.69

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SLIDE 8

Capacity of Existing Drainage System

Tile Location Drainage Area (Acres) NRCS Flow (CFS) 1/2”/Day Existing Tile Size (Inches) Existing Tile Grade (%) Calculated Tile Capacity (CFS) n=0.013 Calculated Coefficient (In. Per Day) Branch S

  • No. off CSAH 4

62 1.29 8” 1.00 1.21 0.47 N ½ Sec. 19 293 6.16 10” 0.10 0.69 0.06 Outlet to Open Ditch 469 9.85 12” 0.30 1.96 0.10 Branch T Upper End 751 15.77 15” 0.05 1.45 0.05

  • No. of 720th St.

1006 21.13 18” 0.05 2.36 0.06

  • Br. T1 Confluence

1093 22.96 18” 0.20 4.71 0.10 Outlet to Open Ditch 1184 24.88 18” 0.20 4.71 0.09

  • Br. T1

Confluence With Branch T 91 1.92 8” 0.25 0.61 0.16

  • Br. T2

Confluence With Branch T 72 1.52 8” 0.10 0.38 0.13

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SLIDE 9

Capacity of Existing Drainage System

Tile Location Drainage Area (Acres) NRCS Flow (CFS) 1/2”/Day Existing Tile Size (Inches) Existing Tile Grade (%) Calculated Tile Capacity (CFS) n=0.013 Calculated Coefficient (In. Per Day) Branch U

  • So. of CSAH 5

17 0.36 8” 0.40 0.77 1.08

  • Br. U5 Confluence

111 2.34 12” 0.10 1.13 0.24 SW ¼ Sec. 32 142 2.98 12” 0.10 1.13 0.19

  • Br. U4 Confluence

197 4.14 12” 0.10 1.13 0.14 W ¼ Corner Sec. 32 302 6.35 12” 0.10 1.13 0.09

  • Br. U3 Confluence

401 8.41 15” 0.10 2.05 0.12

  • So. Of 710th St.

443 9.30 15” 0.12 2.24 0.12

  • No. of 710th St.

456 9.59 15” 0.10 2.05 0.11

  • Br. U2 Confluence

471 9.90 15” 0.10 2.05 0.10

  • Br. U1 Confluence

518 10.89 15” 0.20 2.90 0.13 Outlet to Open Ditch 560 11.77 15” 0.20 2.90 0.12

  • Br. U3

Confluence with Branch U 98 2.07 8” 0.26 0.62 0.15

  • Br. U4

Confluence with Branch U 55 1.16 8” 0.20 0.54 0.23

  • Br. U5
  • W. of CSAH 5

56 1.18 8” 0.10 0.38 0.16 Confluence with Branch U 95 1.99 8” 0.10 0.38 0.10

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SLIDE 10

Capacity of Existing Drainage System

Branch No. Approximate Coefficient (in/day) % of NRCS Standard Branch B 1/16” 14% Branch Q 3/16” 41% Branch S 1/8” 20% Branch T 1/8” 18% Branch U 1/8” 24%

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SLIDE 11

Proposed Improvements

Proposed Drainage Features

  • Replace existing tile
  • 6-inch to 36-inch tile
  • Township road crossings – Open Trench
  • County Road Crossings – Trenchless
  • Lower than the existing tile
  • At least four feet of cover
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SLIDE 12

Proposed Improvement

Design Data

  • Proposed grades range from 0.10% to 2.9%
  • Type of Pipe
  • Dual Wall Polyethylene Drain Tile
  • Pipe deeper than 6’ will be non-perforated
  • Precast Reinforced Concrete Pipe
  • Design Criteria
  • Natural Resources Conservation Service (NRCS)
  • 1/2” of runoff per day
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SLIDE 13

Proposed Improvement

Tile Location Drainage Area (Acres) NRCS Flow (CFS) 1/2”/Day Proposed Tile Size (Inches) Proposed Tile Grade (%) Calculated Tile Capacity (CFS) n=0.012 Calculated Coefficient (In. Per Day) Branch B

  • Br. B2 Confluence

58 1.21 10” 0.50 1.68 0.69

  • Br. B1 Confluence

142 2.97 12” 0.60 3.00 0.50 Outlet to Open Ditch 176 3.69 12” 1.20 4.24 0.57 Branch B1 Branch B Confluence 34 0.72 8” 0.40 0.83 0.58 Branch B2 Branch B Confluence 50 1.04 10” 0.50 1.68 0.81 Branch Q

  • No. of CSAH 4

184 3.87 15” 0.35 4.15 0.54

  • Br. Q5 Confluence

410 8.61 30” 0.10 14.09 0.82 W ½ Sec. 20 560 11.77 30” 0.10 14.09 0.60

  • Br. Q3 Confluence

662 13.91 30” 0.10 14.09 0.51

  • Br. Q2 Confluence

704 14.78 30” 0.11 14.78 0.50

  • Br. Q1 Confluence

718 15.09 30” 0.45 29.89 0.99 Outlet to Open Ditch 795 16.71 30” 0.15 17.26 0.52

  • Br. Q1

Branch Q Confluence 15 0.31 6” 2.00 0.86 1.41

  • Br. Q2

Branch Q Confluence 41 0.87 8” 1.20 1.44 0.83

  • Br. Q3

Branch Q Confluence 102 2.14 15” 0.10 2.22 0.52

  • Br. Q4

Branch Q Confluence 123 2.58 18” 0.12 3.95 0.77

  • Br. Q5

Branch Q Confluence 103 2.17 15” 0.15 2.72 0.63

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SLIDE 14

Proposed Improvement

Tile Location Drainage Area (Acres) NRCS Flow (CFS) 1/2”/Day Proposed Tile Size (Inches) Proposed Tile Grade (%) Calculated Tile Capacity (CFS) n=0.012 Calculated Coefficient (In. Per Day) Branch S

  • No. off CSAH 4

62 1.29 8” 1.00 1.31 0.51 N ½ Sec. 19 293 6.16 24” 0.10 7.77 0.63 Outlet to Open Ditch 469 9.85 24” 0.16 9.83 0.50 Branch T Upper End 751 15.77 30” 0.13 16.06 0.51

  • No. of 720th St.

1006 21.13 36” 0.13 26.12 0.62

  • Br. T1 Confluence

1093 22.96 36” 0.16 28.98 0.63 Outlet to Open Ditch 1184 24.88 36” 0.16 28.98 0.58

  • Br. T1

Confluence With Branch T 91 1.92 12” 0.25 1.94 0.50

  • Br. T2

Confluence With Branch T 72 1.52 10” 0.80 2.13 0.70

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SLIDE 15

Proposed Improvement

Tile Location Drainage Area (Acres) NRCS Flow (CFS) 1/2”/Day Proposed Tile Size (Inches) Proposed Tile Grade (%) Calculated Tile Capacity (CFS) n=0.012 Calculated Coefficient (In. Per Day) Branch U

  • So. of CSAH 5

17 0.36 6” 1.00 0.61 0.86

  • Br. U5 Confluence

112 2.35 15” 0.16 2.81 0.60 SW ¼ Sec. 32 132 2.77 15” 0.16 2.81 0.51

  • Br. U4 Confluence

251 5.27 24” 0.10 7.77 0.74 W ¼ Corner Sec. 32 302 6.35 24” 0.10 7.77 0.61

  • Br. U3 Confluence

401 8.41 24” 0.12 8.51 0.51

  • So. Of 710th St.

443 9.30 24” 0.15 9.52 0.51

  • No. of 710th St.

456 9.59 24” 0.15 9.52 0.50

  • Br. U2 Confluence

471 9.90 24” 0.16 9.83 0.50

  • Br. U1 Confluence

518 10.89 24” 0.20 10.99 0.50 Outlet to Open Ditch 560 11.77 24” 0.23 11.79 0.50

  • Br. U3

Confluence with Branch U 98 2.07 12” 0.40 2.45 0.59

  • Br. U4

Confluence with Branch U 55 1.16 10” 0.45 1.60 0.69

  • Br. U5
  • W. of CSAH 5

56 1.18 15” 0.10 2.22 0.94 Confluence with Branch U 95 1.99 15” 0.10 2.22 0.56

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SLIDE 16

Proposed Improvement

  • Strip and replace topsoil in the trench area
  • Riprap at the outlet
  • Construct new intakes
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SLIDE 17

Proposed Improvement

  • Tile System Depth

Tile Branch Minimum Depth Maximum Depth Branch B 5.4’ 12.8’ Branch Q 4.5’ 17.5’ Branch S 5.2’ 13.9’ Branch T 6.4’ 21.3’ Branch U 5.0’ 16.4’

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SLIDE 18

Proposed Improvement

  • Water and Sediment Control Basin (WASCOB)
  • An embankment across the slope of a field or minor waterway
  • Temporarily detain water.
  • Traps sediment and slows down water
  • Proposed WASCOB at the outlet for Branch B
  • Close in the open waterway to the Open Ditch
  • Create 5.1 acre-feet of storage
  • Proposed WASCOB for Branch T
  • Construct a Berm through an opening in an old railroad embankment
  • 40 foot wide top with 1V:20H or flatter sides
  • Create 20 acre-feet of storage
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SLIDE 19

Adequacy of the Outlet

  • JD 24 Open Ditch
  • The Improvement creates a net increase in flow of 6 cfs
  • Assume peak flows from the tile and the ditch occur at

the same time

  • Estimate change in peak elevation and flow rates in the

JD 24 Open Ditch

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SLIDE 20

Change in Elevation – JD 24 Open Ditch

Change in Flow Rates Change in Flow Depth Flood Frequency Peak Flow Before Peak Flow After Flow Increase (%) Depth Before Depth After Depth Increase (ft) 2-Year 206 212 2.9% 1467.9 1468.0 0.1 5-Year 416 422 1.4% 1469.5 1469.5 0.0 10-Year 598 604 1.0% 1470.3 1470.3 0.0 25-Year 875 881 0.7% 1471.2 1471.2 0.0 50-Year 1110 1116 0.5% 1471.9 1472.9 0.0 100-Year 1390 1396 0.4% 1472.8 1472.8 0.0

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SLIDE 21

Estimate of Cost

  • Total Estimated Cost = $2,667,530
  • Includes 94.4 acres of Temporary R.O.W.
  • Includes 1.4 acres of Permanent R.O.W for the Branch B

WASCOB

  • Separable Maintenance Estimated Cost = $1,804,757
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SLIDE 22