Subsurface Drainage: Principals and Practice. Adapted from presentations by John Panuska and Matt Ruark,, December 2008
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1 Subsurface Drainage: Principals and Practice Adapted from presentations by John Panuska and Matt Ruark,, December 2008
2 Why Tile? Maintain a proper water table level for healthiest plant growth. Keep soil voids free of excess water, which permits air flow and allows soil biological processes to occur.
3 Why Tile? Reduce nitrogen losses from the soil root zone. Minimize inefficient equipment operation caused by wet areas.
4
5 Sub-surface Drainage of Agricultural Land
6 Benefits of Subsurface Drainage Increase crop yields and field traffic-ability. Greater available soil water storage capacity. Conserve topsoil by reducing runoff. Soil temperature increases more quickly. Dry soil is warmer than wet soil. It takes 5 times as much heat to raise an equal volume of water 1 as it does to raise an equal volume of soil 1.
7 Tiling Improves Root Development
8 Increased Yields Agricultural Drainage in the North Central Region, Ohio State University, 1999
9 Drainage Design Using DRAINMOD Relative Yield (%) Net Return ($/a) Tile spacing (ft) -300 Tile spacing (ft) 12 Drainage (in/a/yr) Source: Helmers and Singh, ISU Function of: Soil texture, bulk density, soil type Tile spacing (ft)
10 What Water is Drainable? Gravitational water = volume between saturation and field capacity
11 Flow Into Drains soil surface D d m h water table d D Drain Spacing, L tile drain equivalent confining layer confining layer Factors impacting drainage rate - Tile depth and spacing - Tile line slope and pipe diameter - Soil permeability - Adequate outlet - Confining layer depth
12 Drain Construction Then and Now In 1914, skilled tile layers were paid $2 a day. The grade was set using a level and grade hubs
13 Drain Construction Then and Now Ditches were 3 to 5 feet deep and about 300 feet long. Due to the labor- intensive nature of the work, only 7 to 15 acres of tile were laid per year, taking 7 years to complete the 80 acre project.
14 Drain Construction Then and Now
15 Drain Construction Then and Now
16 Drain Construction Then and Now
17 Drain Construction Then and Now
18 Environmental Risks of Tiles Increased export of nutrients (NH 4, NO 3 and soluble P) and pesticides (Atrazine). Surface inlets act direct conduits to receiving waters. Macropores (roots and earth worm holes) are natural direct conduits. Drainage of wetlands is prohibited.
19 Agricultural Drainage in the North Central Region, Ohio State University, 1999 Interpreting Nitrate Concentration in Tile Drainage Water, Purdue University, Brouder et al., 2005
20 Environmental Risks of Tiles - Macropores - Preferential flow through: 0 - Earthworm burrows 1 - Root holes Shrinkage cracks Structural porosity Dyed Burrows Dyed Burrow 2-3 -
21 Preferential Flow on a Large Scale Photos: Wisconsin Geological and Natural History Survey, UWEX
22
23 Control Measure - Manure in tiles - Manure consistency: 0-2% solids: high risk 2-5% solids: moderate risk > 5% solids: low risk Plugs or shut-offs. Modify tillage / manure incorporation. Precision or smart application (avoid tiles).
24 Environmental Risks of Tiles - Surface Inlets -
25 Control Measures - Blind Inlet (French Drain) - Can be used when water quantity to remove is small or sediment load is high Do not function satisfactorily for more than a few years They are expensive to construct, but do not interfere with farming operations
26 Control Measures - Surface inlet replacement - Drain (D) depth = 3-4 feet efotg.nrcs.usda.gov/references/public/ia/interim980apr08.pdf
27 Field Locating Tile - Air Photos - Pattern tile laterals at ~ 60 ft spacing. Electronic soil survey map from Outagamie Co., WI
28 Field Locating Tile - Crop Health - Regular patterns in crop stand health and yields can indicate tile line location. Yield monitors make this very evident!
29 Field Locating Tile - Crop Growth Patterns - Hay field in Brown County at the end of September.
30 Ineligible for USDA program benefits if: Regulatory Issues - Triggers for Swamp Buster - Plant a commodity crop on wetlands converted between December 23, 1985 and November 28, 1990; or Convert wetlands after November 28, 1990 Wis. DNR, the Corps of Engineers, the county and the local drainage board may also have regulatory authority. Check with your local NRCS field office to be sure!
31 I Wish I Would Have Tiled
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