Saving Face
Inspections revealed that the glass-fiber-reinforced concrete (GFRC) and ceramic tile cladding on a wing of the University of Washington Medical Center, Seattle, failed and needed to be...

Testing of Hollow Clay Tile Masonry Prisms
This paper presents test results of 610-mm wide (24-in.) by 1219-mm high (48-in) by 203- or 330-mm (8- or 13-in.) thick prisms constructed of hollow clay tiles. Three prisms were extracted...

Hyper-Geodesic Structures: Excerpts from a Visual Catalog
A class of hyper-geodesic surface structures is presented. The surfaces of known polygons, polyhedra, plane and space tessellations, higher dimensional polytopes can be subdivided into...

Effect of Agricultural Drainage on Water Quality in the Humid Portion of the Pacific Northwest
Agricultural drainage first began in Washington around 1830 and in Oregon around 1840. The first efforts to drain soils for agricultural use began by constructing shallow ditches spaced...

A Comprehensive Tool for Tile Drainage Planning
The objective of the project is to design and develop a set of software tools, building on existing models and computer-assisted procedures, known as an Advanced Decision Support System...

Pesticide and Nitrate Movement Under Conservation and Conventional Tilled Plots
Carbofuran, alachlor, atrazine, nitrate and bromide (a tracer) were applied to plots with conventional and conservation tillage. During the early part of the growing season the conservation...

A Numerical Method to Describe Seepage Flow into a Row of Drain Tile

Tile Drainage of Irrigated Till Soils in Alberta

Management Impacts on Labor Productivity
This paper uses a simplified model of specific building operations in order to recognize and determine basic influences of management on labor productivity. By making continuous on-site...

Drain Discharge for a Level Agricultural Watershed
A hypothesis was developed that watershed discharge from rainfall, for nonfreezing periods from a tile drained level watershed, was mainly tile flow with negligible amounts of surface...

Bayesian Approach to Tile Drain Design
Economic and sociopolitical aspects of land reclamation in areas that necessitate drainage are combined with technical problems to yield a set of possible decisions, among which an optimum...

Structural Strength of Hollow Clay Tile Assemblages
Clay tile and wall assemblages were tested as compressive prisms with six types of tile units. Specimens were tested at eccentricity ratios of 0, 1/6, and 1/3. Wall column specimens were...

Pump Drainage in Carolina Bays
Small submersible electric pumps were used in conjunction with tile and surface-drainage systems for removing excess water from saucerlike basins at a reasonable cost. Only 0.67 in. (17...

Irrigation through Subsurface Drains
Field experiments were conducted to determine the feasibility of subirrigation on a Lumbee sandy loam soil. Results for the water table response to tile line subirrigation with tile spacings...

Moving Water Tables in Tile-Drained Soils
A Hele-Shaw analogy of the tile drainage problem was used to provide data on moving water table characteristics. The experimental data for water table recession following complete cessation...

Need for Envelope Material above Draintile
The effect of removal of half of the envelope on the performance of a drain-tile installation will vary with each drainage situation. Analysis herein is limited to a drainage situation...

Salt and Water Balance, Coachella Valley, California
The salt balance index (output/input) for the irrigated land of Coachella Valley during 1957-1965 was highly related to both the area of irrigated land having tile drainage and the leaching...

Effect of Opening on Design of Subsurface Drains
Theoretical effects of joint spacing on flow into drain tile and effects of perforations are presented in a form useful for the design engineer. The influence of these openings on the...

Hydraulics of Spatially Varied Pipe Flow
The flow profile in a gridiron drainage main tile where lateral inflows enter at constant intervals is studied in detail. Theoretical equations are derived for computing flow profiles....

Falling Water Table Between Tile Drains
The rate of fall of a water table between drains is determined in a Hele-Shaw model, and the results are compared with those obtained by use of the Glover equation. Considerable differences...

 

 

 

 

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