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Dynamic Soil Properties and Dynamic Land Uses: The Need for Dynamic Soil Interpretations

Dynamic Soil Properties and Dynamic Land Uses: The Need for Dynamic Soil Interpretations. Randall J. Miles University of Missouri National Cooperative Soil Survey National Conference Interpretations Forum June 5, 2007. Dynamic Soil Properties. Near-surface soil properties

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Dynamic Soil Properties and Dynamic Land Uses: The Need for Dynamic Soil Interpretations

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  1. Dynamic Soil Properties and Dynamic Land Uses:The Need for Dynamic Soil Interpretations Randall J. Miles University of Missouri National Cooperative Soil Survey National Conference Interpretations Forum June 5, 2007

  2. Dynamic Soil Properties • Near-surface soil properties • Multiple depth intervals • Vegetative characteristics

  3. Dynamic Land Uses • More intensive land use patterns • Use of “marginal” soil/site conditions (places greater emphasis on surface soil properties) • Non-traditional uses • “Socially controlled” land use patterns • Greater engineering controls

  4. This Increase in Intensive Land Use Pressures Can be Termed: Dynamic Use-Dependent Factors

  5. An Example of a Use-Dependent Factor is Onsite Wastewater Treatment Systems • Applications to: • Stormwater abatement • Soil Erosion • Biosolids Applications • Many others

  6. OWTS Would Use Many of the Following Fundamental Aspects of: • Temporal distribution of water • Spatial distribution of water • Volume distribution of wastewater from the OWTS • Wastewater quality with temporal distribution of wastewater

  7. Wastewater Distribution System Fundamentals Gravity Distribution: Wastewater Goes in and Wastewater goes out: “Socially Controlled” versus Timed Dosed Distribution: A Defined Volume of Wastewater Per Time Unit: “Engineering Control”

  8. “Socially Controlled” System • Gravity Distribution • Dictated by use pattern at the time • Provides a diverse flux of water volume within the system and subsequent soil receiving environment • Provides a diverse flux in quality based on volume and functional component within the housing structure

  9. Source Drop or Distribution Box Drainfield Septic tank with or without effluent screen Soil Basic Gravity System Components

  10. In ground trench

  11. HOURLY VARIATION IN WASTEWATER FLOW

  12. Socially Controlled Provides a Diversity of Wastewater Quality over Time • Nutrients-N,P, etc • Organics • Total Suspended Solids • Heavy Metals • Bacteria, Pathogens, Viruses

  13. SLOPE CONSIDERATIONS 1 3 Horizontal Flow 2

  14. NOT TO SCALE

  15. NOT TO SCALE

  16. NOT TO SCALE

  17. NOT TO SCALE

  18. NOT TO SCALE

  19. Time Dosed Distribution:Engineered Distribution • Provides time/volume control distribution over a 24/7 time frame • Provides more uniform distribution of wastewater quality (integration of wastewater quality) • Provides aeration and resting of soil absorption treatment system

  20. Source Pressure manifold Pump Tank Drainfield Soil Septic Tank with effluent screen Pressure manifold to gravity or pressure

  21. NOT TO SCALE

  22. Drip Distribution Principles • A method of wastewater distribution over a large area as uniformly as possible shallowly • Similar to drip irrigation for plants but need to disperse the effluent all the time. • Most uniform method of distribution

  23. Drip Distribution System

  24. Summit Shoulder Side or back slope Foot slope Toe slope Drainage way

  25. 1 2 3 4 5

  26. HYDROLOGIC CYCLE Precipitation Septic System Infiltration Evapotranspiration Wastewater Input Runoff Lateral Flow Water Table Stream Slowly Permeable layer Ground Water Slow Moving Impermeable Layer

  27. Lateral movement • Overall system issue • Controlled by “smallest window” • Related to: • Over all length • Over all [Compounding] flow

  28. Dynamic Interpretations for Dynamic Use-Dependent Factors • Need fundamental spatial distribution of water movement in the soil landscape • Need fundamental temporal distribution fo water movement in the soil landscape • Socially controlled versus Engineering Controlled distribution • Need water quality parameters

  29. Additional Pressure for DynamicUse-Dependent Interpretations • Many land use applications are likely to evolve from prescriptive based applications to performance based applications. An example is the National Onsite Wastewater Recycling Association’s Model Code • Applications to many other land uses as a result of greater pressure induced by sprawl plus use and fluxes of water within the soil landscape

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