Title |
Upper Colorado Region Comprehensive Framework Study: Appendix X, Irrigation and Drainage |
Creator |
Upper Colorado Region State-Federal Interagency Group for the Pacific Southwest Interagency Committee Water Resources Council |
Subject |
Water quality; Irrigation; Drainage; Reservoirs |
OCR Text |
Show This report was prepared at field level and presents a framework program for the development and management of the water and related land resources of the Upper Colorado Region. |
Publisher |
Upper Colorado Region State-Federal Inter-agency Group : Pacific Southwest Inter-agency Committee, Water Resources Council |
Contributors |
Shafer, Paul S.; Russiff, John N. |
Date |
1971-06 |
Type |
Text |
Format |
application/pdf |
Digitization Specifications |
Digital images were scanned by Backstage Library Works Inc. Bitonal materials were scanned at 400ppi using a Panasonic KV-S2065W sheetfed scanner. Grayscale materials were scanned at 400ppi using an Image Access WideTEK flatbed scanner. All files were saved as TIFF and converted to JPEG for Web presentation. PDF files were also generated from the TIFF files. |
Language |
eng |
Rights Management |
Digital image copyright 2004, University of Utah. All rights reserved. |
Contributing Institution |
S.J. Quinney Law Library, University of Utah. 332 South 1400 East, Salt Lake City, UT 84112-0730 |
Source Physical Dimensions |
26cm x 20cm |
Scanning Technician |
Backstage Library Works 1180 S. 800 E. Orem, UT 84097 |
Call Number |
KF5582.C6 A8 App. X |
ARK |
ark:/87278/s69z9475 |
Setname |
wwdl_documents |
ID |
1133400 |
Reference URL |
https://collections.lib.utah.edu/ark:/87278/s69z9475 |
Title |
UUM_UpperColoX_page_057 |
OCR Text |
Show PART III IRRIGATION POTENTIAL Table 20 - Land classification specifications for irrigation land classesj Irrigation land clas'ses Land characteristics Soils Texture (surface 12 inches)2/ Available water-holding capacity to k8 inches!/ Effective depth (inches)kj Salinity (ECe x 10^ at equilibrium with irrigation water) Sodic conditions^/ Percent area affected Severity of problems/ Permeability (in place-inches/hour) Permissible coarse fragments (percent by volume) Gravel Cobbles Rock outcrops (distance apart in feet) Soil erosion^/ Topography (or land development items)%J Stone for removal (cubic yards per acre) Slope (percent) Moderately to severely erodible Slightly erodible Surface leveling or tree removal (amount of cover) Irrigation method10/ Drainage Soil wetness Depth to water table during growing season with or without drainage Loam or finer Sandy Surface drainage Depth to drainage barrier in feet Air drainage.ll/_________________________________________________________________________________________________ T/ Specifications are representative of conditions after land is developed for irrigation.Each individual factor represents a minimum requirement, and unless all other factors are near optimum two or more interacting deficiencies may result in land being placed in lower class or designated class 6-nonarable. 2/ Finer textures may be required than those indicated for each class in areas subject to critical hot spells or wind; coarser textures permissible for specific crop and climatic conditions. 2/ In areas of very warm growing season 3 inches may be required for class k and in cold areas as little as 5 inches may be permitted for class 1. kj Depth of 60 inches or more required for class 1 where deep-rooted crops are important in crop pattern. 5/ More extensive and severe sodic problems may be tolerated in areas of wide crop adaptability. 6/ Severity of problem: Slight-ESP less than 15 percent or less than 25 percent if dominated by nonswelling clays, moderate-ESP less than 20 percent or less than 30 percent if clay minerals favorable, severe-ESP less than 30 percent; with certain soil minerals may range above 50 percent as measured by usual techniques. 7/ May range above 50 percent in subsoil for certain crops if surface soil favorable. 0/ Soil erosion-for all classes: severely eroded soils will be downgraded one class. Less severely eroded soils may be downgraded one class, depending on other conditions. 2/ Special crop and management practices may justify exceeding the limits for stone removal or slope in class k; irregularity of slope may necessitate downgrading of class unless deficiency is compensated for by possi- bility of sprinkler irrigation. 10/ Irrigation method-lands unsuited to gravity irrigation where land grading would permanently reduce soil fertility below irrigable limits or exceed permissible costs, or field pattern too complex, may be considered for sprinkler irrigation. Land must meet other requirements for irrigability. Designated by "S," as for example, class 3S. ll/ Air drainage a consideration mainly in areas adapted to fruit or to early or late vegetables. Class 1 Class 2 Class 3 Class h Class 6 Loamy very Loamy sand Medium sand Medium sand All oths-r fine sand to clay to clay to clay lands not to clay meeting loam criteria for irri-6.0" k.5" 3-0" 2.5" gability kO 30 20 10 h 8 12 16 5 15 25 35 Slight Moderate Moderate Moderate 0.2-5.0 0.05-5.0 0.05-10.0 Ko limit 15 35 55 TO 5 10 1/15 1/35 200 100 5C 30 10 25 50 70 2 5 10 20 k 10 20 25 Light Medium Medium heavy Medium heavy 60" if-O" 20" 10" 50" 30" 20" 10" Good Good Restricted Good 7 6 5 1-5 Ko problem Minor Restricted Restricted |
Format |
application/pdf |
Resource Identifier |
077_UUM_UpperColoX_page_057.jpg |
Source |
Original document: Upper Colorado Region Comprehensive Framework Study: Main Report |
Setname |
wwdl_documents |
ID |
1133347 |
Reference URL |
https://collections.lib.utah.edu/ark:/87278/s69z9475/1133347 |