Topsoil Loss and Modification During Suburbanization: Impact on Demands for Municipal Water. R.G. Darmody

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1 Topsoil Loss and Modification During Suburbanization: Impact on Demands for Municipal Water R.G. Darmody Department of Natural Resources and Environmental Sciences University of Illinois

2 The Problem Demands on water in the US, have grown tremendously. In 1900, the Americans used 5-10 gpd. In 2000, gallons a day. 36% of U.S. domestic water goes to lawn and garden irrigation Sprawl, suburbanization National Wildlife Federation, 2004; Sustainable Building Sourcebook, 2004

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4 Topsoil Definitions Topsoil is one of those things that are hard to define, but you know it when you see it. - Upper, outermost layer of soil, top 2 to 8 in., highest organic matter and microorganisms, most biological activity. - Upper surface of the Earth's crust, no deeper than 20 cm, rich humus, minerals, and compost, nutritious plant substrate. - Surface soil, including the organic layer in which plants root, farmers turn over in plowing. - Fertile, upper part of the soil. - Organically enriched A horizon at the soil surface. - Upper part of the solum, the plow-layer, synonymous with A horizon.

5 Illinois Topsoil, best in the world!

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14 Research Methods 1. Site selection 2. Soil sample retrieval - description, lab materials; 3/site 3. Soil bulk density sampling; volumetric core sampler; 3/site 4. Infiltration measurement infiltrometer; 3/site 5. Penetrometer resistance; penetrometer 6. Soil fertility analysis, extractable elements

15 Research Sites Plainfield - 12 recently constructed schools, 1 8 years old - Sampled near and away from building, three reps per sub-site - Two reference farm fields, 10,000 years old - Total of 126 samples Champaign - 10 residential sites, 2 15 years old - Front and back lawns, three reps per site - 1 commercial site, 2 sun-sites - Three reference farm fields, 12,000 years old - Total of 69 samples/observation sets

16 Aux Sable Middle School Soil Map 2 1

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19 Plainfield Reference Site

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24 Commercial site

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30 Plainfield Pre-Development Soils Site Soil Map Unit Soil Series Drainage Class Soil Classification 1 541B Graymont SiL Moderately Fine-silty, mixed, superactive, mesic Well Oxyaquic Argiudolls 2 541B Graymont SiL 3 541B Graymont SiL 4 356A Elpaso SiCL Poorly Fine-silty, mixed, superactive, mesic Typic Endoaquolls 5 293A Andres SiL Somewhat Fine-loamy, mixed, superactive, mesic Poorly Aquic Argiudolls 6 293A Andres SiL 7 541B Graymont SiL Mod. Well Fine-silty, mixed, superactive, mesic Oxyaquic Argiudolls 8 541B Graymont SiL 9 356A Elpaso SiCL Poorly Fine-silty, mixed, superactive, mesic Typic Endoaquolls A Elpaso SiCL A Mundelein SiL Somewhat Fine-silty, mixed, superactive, mesic Poorly Aquic Argiudolls A Drummer SiCL Poorly Fine-silty, mixed, superactive, mesic Typic Endoaquolls A Andres SiL Somewhat Fine-loamy, mixed, superactive, mesic Poorly Aquic Argiudolls A Andres SiL

31 Champaign Pre-Development Soils Site Soil Map Unit Soil Series 1 152A Drummer SiCL Drainage Class Poorly Soil Classification Fine-silty, mixed, superactive, mesic Typic Endoaquolls 2 152A Drummer SiCL 3 56B Dana SiL Moderately Fine-silty, mixed, superactive, mesic Well Oxyaquic Argiudolls 4 330A Peotone SiCL Very Poorly Fine, smectitic, mesic Cumulic Vertic Endoaquolls 5 152A Drummer SiCL Poorly Fine-silty, mixed, superactive, mesic Typic Endoaquolls 6 152A Drummer SiCL 7 152A Drummer SiCL 8 154B Flanagan SiL Somewhat Fine, smectitic, mesic Aquic Poorly Argiudolls 9 154B Flanagan SiL A Drummer SiCL Poorly Fine-silty, mixed, superactive, mesic Typic Endoaquolls A Peotone SiCL Very Poorly Fine, smectitic, mesic Cumulic Vertic Endoaquolls A Drummer SiCL Poorly Fine-silty, mixed, superactive, mesic Typic Endoaquolls A Drummer SiCL Poorly

32 Plainfield Pre-Development Soils Soil Map Unit Soil Map Unit Name Avail. H 2 O (in/in) Bulk Density Ksat (in/hr) ph CEC SOM % Limitation, lawns 152A Drummer SiCL Very limited: depth to saturated zone, ponding 293A Andres SiL Somewhat limited: depth to saturated zone 356A Elpaso SiCL Very limited: depth to saturated zone, ponding 442A Mundelein SiL Somewhat limited: depth to saturated zone 541B Graymont SiL Not limited

33 Champaign Pre-Development Soils Soil Map Unit Soil Map Unit Name Avail. H 2 O (in/in) Bulk Density Ksat (in/hr) ph SOM % CEC Limitation, lawns 56B Dana SiL Slight 152A Drummer SiCL Severe, ponding 154B Flanagan SiL Moderate, wetness 330A Peotone SiCL Severe, ponding

34 Standard Infiltration Ratings Rate (in/hr) Rating < 0.2 very low 0.2 to 0.4 low 0.4 to 0.75 moderately low 0.75 to 1.25 moderate 1.25 to 1.75 moderately high 1.75 to 2.5 high > 2.5 very high

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37 Penetrometer Resistance of Soil in Lawn Penetrometer Resistance (MPa) Depth (cm)

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40 Soil Cores from Plainfield sites

41 Champaign Lawn Soil Cores

42 Soil Texture Plainfield Sites Champaign Sites Clay 70 Clay Loamy Sand Sand 50 Sandy Clay Sandy Clay Loam Sandy Loam Clay Loam Loam Silty Clay Silty Clay Loam Silt Loam Silt Loamy Sand Sand 50 Sandy Clay Sandy Clay Loam Sandy Loam Clay Loam Loam Silty Clay Silty Clay Loam Silt Loam Silt Percent Sand Percent Sand Hydrometer method for silt and clay, sands by sieving.

43 Plainfield Extractable elements (0-8 cm) Site CEC meq/ 100g ph Org. Matter % Extractable (mg kg -1 ) S P Ca Mg K Na B Fe Mn Cu Zn Al Aux Sable 26 ab 6.7 ab 3.7 b 48 a 56 ab c 171 e b 160 c 96 a 4.0 ab 2.3 b 788 b Plain. South 27 ab 6.9 ab 4.9 ab 57 a 65 ab c 277 c ab 125 d 97 a 9.5 a 3.2 b 616 d Eagle Point 27 ab 7.0 ab 4.4 ab 33 ab 52 b ab 247 cd ab 171 bc 98 a 3.6 ab 2.1 b 699 c Ridge 29 ab 7.2 a 5.4 a 34 ab 118 a a 377 a a 156 cd 72 b 6.1 a 11.7 a 599 d Dra. Point 29 a 7.3 a 5.2 ab 32 ab 180 a bc 325 b a 147 cd 81 ab 7.0 a 17.0 a 586 d Ch. Reed 28 ab 6.6 b 4.3 ab 28 b 54 b c 274 c ab 137 cd 56 c 4.1 ab 2.3 b 737 bc Ref. 24 b 5.8 c 5.0 ab 38 ab 98 ab c 220 d b 224 a 38 d 3.3 b 3.8 b 835 a Mehlich III extractables, water ph.

44 Champaign Extractable elements (0-8 cm) Lawn Type CEC (meq/ 100g) ph Org. Matter (%) Extractable (mg kg -1 ) S P Ca Mg K Na B Fe Mn Cu Zn Al R R R R R R R C C R Mehlich III extractables, water ph.

45 Bulk Density Sampler

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48 1.6 Plainfield Soil Bulk Densities 1.4 Bulk Density (g/cc)

49 40 Plainfield Soil Volumetric Water Contents 35 Volumetric H 2 O (%)

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52 Infiltrometer

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57 4.5 Comparison of Infiltration Means 4.0 Alternative Mean (in/hr) Site Geomean Site Harmean Site Trimean Site Median Arithmetic Mean (in/hr)

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59 Plainfield Sites Bulk Density vs. Infiltration Rate 1.6 Bulk Density (g/cc) Infiltration Rate (in/hr)

60 Champaign Sites 1.8 Bulk Density vs. Infiltration Rate 1.7 Bulk Density (g/cc) Infiltration Rate (in/hr)

61 Take Home Message 1. Illinois has some of the best soils in the world for agriculture 2. Illinois is a rapidly suburbanizing state 3. Water resources are limited, particularly in the collar counties 4. Soils are impacted by development, pavement is forever 5. Water that does not infiltrate is not available to plants and runs off exacerbating flooding 6. Soil bulk density and Infiltration rates are highly variable on disturbed soils 7. Statistically the research did not support the hypothesis that infiltration is negatively impacted by development.

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63 Soil at Eagle Point School

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65 Soil Cores from Champaign sites 60

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