complex / exciting soils · •use texture to make inferences into pore size •from pore size...
TRANSCRIPT
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Complex / Exciting Soils
Soils: Understanding the Foundations of an Onsite Wastewater System
Created with a trial version of Syncfusion Essential PDF
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Soils: Understanding the Foundations of an Onsite Wastewater System
• Texture• Clay Minerology• Structure• Soil Wetness Conditions
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Factors That Impact Water Movement in Soil
• Soil texture• Soil mineralogy• Soil structure• Soil wetness• Organic matter and vegetation• Land use• Landscape position• Parent material
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7/15/20 Soil and Site. Lindbo et al. DRAFT 5
Soil Texture
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What is Soil Texture• Soil texture is the relative proportion of • Sand• Silt• Clay
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Soil Texture
• Use texture to make inferences into pore size• From pore size begin to estimate water
movement and treatment• Finer texture means slower water movement• Finer texture means greater treatment
• Texture by itself is not enough information to determine site suitability
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Soil Texture (Mineral Material Only)
• Sand – gritty
• Silt - smooth, velvety
• Clay - slick, sticky
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USDA Textural Classes (12)
• Sand• Loamy Sand• Sandy Loam• Loam• Silt Loam• Silt
• Sandy Clay Loam • Silty Clay Loam• Clay Loam • Sandy Clay • Silty Clay• Clay
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Examples
Soil Texture
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150’ – 200’ Trench
LTAR = 0.8 – 0.6 gpd/ft2
40 % Sand40 % Silt20 % Clay
LOAM
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300’ – 1200’ Trench
LTAR = 0.4 – 0.1 gpd/ft2
25 % Sand30 % Silt45 % Clay
Clay
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65 % Sand20 % Silt15 % Clay
Sandy Loam 150’ – 200’ Trench
LTAR = 0.8 – 0.6 gpd/ft2
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Textural Groups for OSWW• Group I:
• Sand, Loamy sand• Group II:
• Sandy loam, Loam, • Group III:
• Sandy clay loam, Silt loam, Clay loam, Silty clay loam, Silt
• Group IV: • Sandy clay, Silty clay, Clay
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Determining Texture
Soil Texture
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Determination of Texture• Field procedure• Laboratory procedure• Hydrometer• Pipette
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Field Determination Of Texture• Soil must be moist, not saturated; moist enough
to mold like putty when you try to form a ball in your hand.• Soil Texture Class Key*• Does soil form a ball or cast?• No - the texture is SAND
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Soil does not form a cast:
Textural class is SAND
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Field Determination Of Texture• Can the ball be handled?• No - the texture is LOAMY SAND.• OR•When pressing the soil between thumb and
forefinger does the soil form a ribbon that extends beyond your forefinger? • No - the texture is LOAMY SAND.
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Forms a cast of moist soil material.
Textural class is LOAMY SAND
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Making A Ribbon
The length of the ribbon will depend on mineralogy as well as clay content
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Field Determination Of Texture• If the soil forms a ribbon that that extends past
the forefinger, note the length of the ribbon. • Next excessively wet a small sample in the palm
and rub with the forefinger.
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Field Determination Of Texture
• If the ribbon was < 1 inch long when it broke and the excessively wet sample feels:
• gritty, the texture is SANDY LOAM; • smooth, the texture is SILT LOAM; • neither gritty nor smooth, the texture is LOAM.
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Field Determination Of Texture
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Field Determination Of Texture• If the ribbon was between 1 and 2 inches long
when it broke and the excessively wet sample feels:
• gritty, the texture is SANDY CLAY LOAM; smooth, • the texture is SILTY CLAY LOAM; • neither gritty nor smooth, the texture is CLAY LOAM.
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Field Determination Of Texture
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Field Determination Of Texture
• If the ribbon > 2 inches long when it broke and the excessively wet sample feels:
• gritty, the texture is SANDY CLAY; • smooth, the texture is SILTY CLAY; • neither gritty nor smooth, the texture is CLAY.
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Field Determination Of Texture
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Tricks For Determining Texture
• How much water does it take to moisten the sample?
• The more clay in the sample the more water it will take
• Does the sample leave hands with dusting• Silt
• Does your thumb leave a finger print in the sample?
• Fingerprints = Clay
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Tricks For Determining Texture
What do your hands look like after drying?
Sand will not leave much evidence
Silt will leave your hands with a dusty coating
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Avoid Texture Mistakes
• Don’t overestimate silt content • Mica in the soil will feel like silt but is actually sand
sized• Organic material will make a sample feel more silty
than it really is• Don’t overestimate clay content
• Expansive clays will make a sample feel like it is higher in clay than it really is
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Clay Mineralogy
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Clay Mineralogy
• Clay mineralogy affects:• The degree to which some soils swell when wetted• Thereby affecting the number of pores• Thereby affecting wastewater movement through soil
• Therefore … • Clay mineralogy affects site suitability
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Types of clay
• 1:1 Clays (such as kaolinite)• Do not expand extensively on wetting
• 2:1 Clays, including mixed mineralogy clays (e.g. mix of kaolinite and montmorillonite or other clay minerals)• May shrink and swell extensively when dried and wetted
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Impacts on Water Movement
Soil Structure
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What Is Soil Structure?
• The natural aggregation of basic soil particles into identifiable masses, or structural units
• These units are identified by:• Type- based on the shape• Size – based on the relative size• Grade- based on how well the structure is developed
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Definition
• Soil Structure• the arrangement of primary soil particles
into compound particles, peds, or clusters• that separate by natural planes of
weakness from adjoining aggregates.
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Soil Structure
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How Soils Get Structure• Excretions from soil microbes bind soil particles
together• Filaments from soil fungi tie soil particles together• Plant roots excrete sugars and waste products that
bind soil mineral particles• Movement of clay and organic materials helps bind
soil particles• Electrostatic forces
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Types Of Soil Structure
Granular (crumb)BlockyPlatyPrismaticColumnarWedgeSingle Grained
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Water Movement• Predominantly around structural units versus
through structural units
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Soil Structure• Crumb And Granular Soil Structure = Suitable
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Blocky Sub-Angular Blocky
Block-like Soil Structure
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Soil Structure
• PLATY SOIL STRUCTURE = Problematic
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Soil Structure
• PRISMATIC SOIL STRUCTURE = Problematic
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Soil Structure
• ABSENCE OF SOIL STRUCTURE –• Soils which are single grained and exhibit no
structural aggregates = SUITABLE • Soils which are massive and exhibit no structural
peds = UNSUITABLE.
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• The finer the ped size, the better the drainage
• Smaller Peds = Smaller Drainfield
How Does Structure Affect System Size
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Jonathan GodfreyDepartment of Crop & Soil Sciences
North Carolina State University
Soil Wetness
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Soil WetnessWe do not rely on visual observation of water or wet soils We use soil colors as an indication of how well-drained or wet a soil is (or was)
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Seasonally Waterlogged
Soils Will Develop a
Mixture ofGray and BrownColors as Fe is
ReducedAnd
Re-Oxidized
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Waterlogged Soils Are Identified By:
•Colors that form only in anaerobic soils: contain no oxygen (reduced) and are saturated.•Diagnostic colors are gray with spots of red or brown that form in soils that were reduced. •Termed Redox Depletions (gray) and Redox Concentrations (red, brown)
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How To Make A Soil Gray?
1. Specific chemical reactions must occur to cause gray colors to form when soils are saturated.
2. These reactions require: • Bacteria, • Organic matter, • Saturated soil, and • Slowly moving water lacking oxygen.
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Wheredoes the brown colorcomefrom?
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Red Soil Gray Soil
Remove
Fe coats
Gray sandcoveredby red Fe3+ coating
Sand withoutFe coatings
sand
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