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Module 2 (iii) Technical Soil Services PERSPECTIVE

NASIS SOIL SURVEY INTERPRETATIONS. Module 2 (iii) Technical Soil Services PERSPECTIVE. Rationale.

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Module 2 (iii) Technical Soil Services PERSPECTIVE

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  1. NASIS SOIL SURVEY INTERPRETATIONS Module 2 (iii) Technical Soil Services PERSPECTIVE

  2. Rationale The Technical Soil Scientist is the NRCS soils consultant and deals primarily with soil interpretations. In order to be effective in delivering soils interpretations there must be an understanding in the process of creating an interpretation and understanding the interrelationships of the soil properties used in interpretations for land use decisions.

  3. Exercise Objectives • Differentiate Properties and Interpretations • This module will use an exercise in Pond building to understand how the Interpretation 8 step process is used in TSS • Be able to compile a list of soil properties for an interpretation • Identify the interrelationships of soil properties • Understand how to troubleshoot an interpretation • Understand how to overcome soil property limitations

  4. Define Property: a quality or trait belonging to an individual or thing Define Interpretation: to explain or tell the meaning of or to present in understandable terms

  5. Interpretations NSSH 617.00 • (a) Purpose • Soil survey interpretations predict soil behavior for specified soil uses and under specified soil management practices. • They help to implement laws, programs, and regulations at local, State, and National levels. • They assist the planning of broad categories of land use, such as cropland, rangeland, pastureland, forestland, or urban development. • Soil survey interpretations also help to plan specific management practices that are applied to soils, such as irrigation of cropland or equipment use.

  6. Properties ?? Pedon Description Lab Data Properties Interpretations What properties do you extract from a pedon description??

  7. Review • Interpretations ?? Properties ?? K factor ? Septic tankAdsorption fields? Texture ? PermeabilityS, Si, Cwater tablerocksflooding, etc. Silt, VF Sand, Sand > 0.1mm, OM, Structure, Permeability Sand, silt and clay

  8. Soil Interpretation Criteria (617.10) Step 1. Define the Activity Step 2. Separate Aspects Step 3. Identify Site Features Step 4. List Soil Properties Step 5. Select the Number of Separations Step 6. Document Assumptions Step 7. Develop the Criteria Table Step 8. Application, Presentation, and Testing

  9. Define the Activity • A landowner has come into the office to obtain assistance in building a pond. • What activities need defining?

  10. Step 1. Define the Activity • Pond Reservoir Area • Livestock Water • Hold water most of the year • 3 meters (10 feet deep) • D8 dozer • View survey first, then onsite • describe the activity or use; • identify the function(s) of the activity or use; • define the desired performance of the activity or use; • specify the soil depths that are affected; • identify the type of equipment for installation; • define the needed map and interpretation reliability and uniformity.

  11. Gathering Information - Survey

  12. Defining the Activity Land Use? Soils? Smithdale Soil properties and possible limitations?

  13. Pond Reservoir Rating Map

  14. Disclaimer • Bottom of the Home Page

  15. Soil Interpretive Rating

  16. So, you go dig a hole

  17. Soil Features - Onsite

  18. Let’s get to moving dirt!! I WANT A POND, HERE!

  19. Questions??? • What is a pond reservoir area? • What soil properties would be possible limiting features for a pond reservoir area?

  20. Practice Standards • National Practice Standardshttp://www.nrcs.usda.gov/technical/Standards/nhcp.html

  21. State Practice Standards

  22. Pond 378

  23. What is it? • A pond reservoir area is an area that holds water behind a dam or embankment. Livestock or wildlife watering facilities are examples of the potential application of pond reservoir areas.

  24. What soil properties? • The soils best suited to this use have a low seepage potential, which is determined by permeability and depth to fractured or permeable bedrock, to a cemented pan, or to other permeable material.

  25. Where do you find that information?

  26. Step 2. Separate Aspects • Separate different aspects of the activity for separate interpretations. Aspects of interpretations are planning elements that require different criteria, such as installation, performance, maintenance, and effect. Each aspect is a unique interpretation that has separate criteria and users. Mention other aspects that may need interpretation but are not addressed.

  27. So what aspects need to be considered for a Pond? • Installation? • Performance? • Maintenance?

  28. Step 3. Identify Site Features • Identify significant site features for the interpretation and any assumptions about them. Site features are not soil properties, but are features such as climate factors, landscape stability hazard, vegetation, and surface characteristics. Identify and record the implied affect of site features on each aspect of the interpretation. Although site features are not soil properties, they are commonly recorded on soil databases and are valuable for developing interpretations because they are geographically specific to soils.

  29. So, what Site Features do we need to consider? • List them …

  30. Developing Soil Interpretation Criteria (617.10) Step 1. Define the Activity Step 2. Separate Aspects Step 3. Identify Site Features Step 4. List Soil Properties Step 5. Select the Number of Separations Step 6. Document Assumptions Step 7. Develop the Criteria Table Step 8. Application, Presentation, and Testing

  31. Step 4. List Soil Properties • Identify and list the specific soil properties that are significant to the interpretation. Use only basic properties, qualities, or observed properties and do not make interpretations from previous interpretations or models.

  32. Smithdale soil properties

  33. Step 5. Select the Number of Separations • Select the number of interpretative separations (groups), and define the intent of the separation or classification. Each separation should have a purpose, which normally represents a significant management grouping and a need for separate treatment. Commonly used terms in separations are Not Limited (slight) , Somewhat Limited (moderate), and Very Limited (severe) for limitations or good, fair, and poor for suitability's. User needs dictate the number of separations. The levels of user needs may vary. Some users do not use groupings (class).

  34. Number of Separations? • Landowner has two • Can I build a pond? • Can I not build a pond?

  35. Properties and Criteria Interpretation Criteria • The soils best suited to this use have a low seepage potential, which is determined by permeability and depth to fractured or permeable bedrock, to a cemented pan, or to other permeable material. • Ratings are based on soil properties and qualities to act as a natural barrier against seepage into deeper layers, without regard to cutoff trenches or other features that may be installed under the pond embankment. Excessive slope in the direction perpendicular to the axis of the pond embankment seriously reduces the storage capacity of the reservoir area. Suitable sites may be difficult to find on slopes steeper than about 10 percent.

  36. Break Out Rooms?? • Brainstorm steps 1-5 • Identify necessary interpretation items • interpretation aspects • site properties and • soil properties • What is your recommendation?

  37. Step 6. Document Assumptions • Document assumptions about the significance of the property and established values for separating criteria. (a) A record of the significance of the property (b) Indicate why the feature is important and why the specific break was chosen (c) Establish values that are significant to the interpretation and not to the mapping

  38. Step 7. Develop the Criteria Table • Assign feature and impact terms, and develop the criteria table. The following categories of column headings are recommended for use in the criteria table: • Factor - this is the soil property; • Degree of Limitation - such as Very Limited (severe), Moderately Limited (moderate), Not Limited (slight), etc.; • Feature - the term to be displayed for soil property; and • Impact - the dominant impact that the soil property has on the practice being rated.

  39. Evaluating Soil Properties

  40. How do you identify the Interpretation Criteria? • No longer have NSSH Rating Guides • Stored in NASIS • Stored in SSURGO • Reports are available

  41. NASIS • Load the Rule you wish to run

  42. NASIS

  43. NASIS Reports

  44. SSURGO – Access template • Run specific report

  45. SSURGO – Access Template

  46. SSURGO - SDM

  47. SSURGO - SDM

  48. SSURGO - SDM

  49. Step 8. Application, Presentation, and Testing • Database needs • Temporal considerations for application • Reliability • Testing • Date the interpretation and criteria • Document, document, document

  50. Back to the Landowner • Now that you have the soils information, • And you have the interpretation criteria - • Do you feel the pond will hold water?

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