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Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group Agricultural Drainage, Extreme.

Published byMadeline Sharyl Henry Modified over 8 years ago

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Presentation on theme: "Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group Agricultural Drainage, Extreme."— Presentation transcript:

1 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group Agricultural Drainage, Extreme Weather, and Management Opportunities

2 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group Outline Why do we need agricultural drainage in VA? What are the approaches to drainage & water table management? How does extreme weather drive need for drainage?

3 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group Benefits Artificial drainage… Increases land productivity Improves trafficability and timeliness Provides opportunity to control & treat discharges

4 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group

5 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group Benefits Artificial drainage… Increases land productivity Improves trafficability and timeliness Provides opportunity to control & treat discharges

6 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group Benefits Artificial drainage… Increases land productivity Improves trafficability and timeliness Provides opportunity to control & treat discharges

7 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group \

8 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group Different practices for different conditions Source of water Surface, subsurface, combination strategies Drainage vs. water table control Drainage only or water table control More opportunity to improve water quality What are the approaches to drainage & water table management?

9 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group Ag Drainage 101 Surface drainage problems

10 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group Ag Drainage 101 Subsurface drainage problems Does not remove plant available water

11 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group Ag Drainage 101: Approaches Problem & Soil CharacteristicsPotential Solution Soil completely saturated (poorly drained) Ditch or tile Low infiltration rate (clay or compacted soils) Surface smoothing Shallow impeding soil layersDitches or tile with inlets

12 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group Ag Drainage 101: Surface Fine textured soil, low permeability Water originating on- site ( gpsontario.ca) Land Leveling ( Source: bae.ncsu.edu) Ditching Two-stage Channel

13 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group Ag Drainage 101: Subsurface ( Source: G. Sands, UMN) Removes water from the root zone

14 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group Ag Drainage 101: Subsurface - Plans Different configurations: Different spacing requirements: ( extension.iastate.edu) ( omafra.gov.on.ca)

15 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group Ag Drainage 101: Combined Systems

16 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group Environmental Consequences Water quantity manipulation Water quality alteration

17 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group Ag Drainage 101: Managed Systems Environmental benefits Conservation Practice Standard 554 More efficient use of rainfall, decreased need for irrigation

18 Drainage Handbook Ag Drainage 101: Managed Systems

19 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group How does extreme weather drive need for drainage ? Need for drainage water management is site specific: Climate Geology Topography Soil characteristics Crops Farming methods …and the climate is changing!

20 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group Precipitation Trends in Virginia: Eastern VA: 13-29% Western VA: 10-22% North central VA: -3-7% South-central VA: -2-8% Eastern VAWestern VA Rainfall generally increasing 1980-2014 Rainfall intensity increasing as well

21 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group Future Precipitation Trends? Predicted 2041-2070 precipitation changes

22 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group ?

23 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group Water quality implications of extreme weather Increased nutrient and sediment export Increased soil erosion Increased demand on water supply drive need for controlled drainage

24 ‘The question then is not whether one can afford to drain, but whether one can afford not to drain’

25 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group Contact http://www.virginiaplaces.org/waste/stormwater.html Zachary Easton Assistant Professor zeaston@vt.edu 540-231-0689 Emily Bock Grad Research Assist. emilyml@vt.edu 757-710-1503 Thank you!

26 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group Resources National Engineering Handbook – USDA- NRCS Ch 10, part 634-Drainage, Water Table Control Ch 14, part 650-Water Management, Drainage Extension publication: extension.umn.edu/agriculture For Virginia—coming soon! Agricultural Drainage Management Stems Task Force

27 Invent the Future Biological Systems Engineering VirginiaTech Invent the Future Watershed Science and Engineering Group List of Drainage BMPs General: controlled drainage Tile systems: Reactive barriers Biofilters Wetlands (surface, riparian) Ditch systems: Reduced dip out frequency mowing Two-stage ditches Reactive barriers, in-ditch filters

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