Effect of Snow Cover on Upward Movement of Soil Moisture
The soil moisture in the ground beneath a snow cover in the north central United States has been observed to increase during the winter season. The maximum prethaw soil moisture frequently...

Deterioration of Concrete Ditch Liners in Saline-Alkali Soil
Irrigation head ditches are normally installed at a slightly higher elevation than the field they serve. Since moisture diffuses toward the highest elevation, evaporation and salt accumulation...

Infiltration and Landfill Behavior
The effects of infiltration on sanitary landfill leachate and gas production were examined under both field and laboratory conditions. Maximum field leachate production occurred during...

Subgrade Moisture under Oklahoma Highways
Data and conclusions from a 6-yr field study of subgrade moisture under existing Oklahoma highways are presented to show the effects of soil, climate, and highway design on subgrade moisture...

Viscoelastic Shrinkage Stress in Soil-Cement Base
Engineers generally consider cracking in soil-cement bases to be caused by stresses induced by shrinkage and ambient temperature. When the shrinkage is assumed to be proportional to the...

Simulation of Post-Irrigation Moisture Movement
The transpiration-induced moisture removal by the plant roots is represented by a negative source term in the Darcy equation. When the soil is wetted to near saturation, the moisture flow...

Liquid Limit Values by Soil Moisture Tension
The feasibility of using soil mositure tension as a practical method of determining consistency limit values is investigated. Samples with known limits determined by standard methods were...

Access Tube Installation For Nuclear Depth Gages
Contract research to measure subgrade moisture variations under Oklahoma highways with nuclear depth moisture and density gages required development of special procedures to install nuclear...

Water Movement in an Unsaturated Sanitary Landfill
Understanding of the moisture regimen of a sanitary landfill is basic to a knowledge of the character and quantity of the water-borne contaminants it generates. Moisture-routing methods...

Antecedent Retention Indexes Predict Soil Moisture
Two models for calculating antecedent moisture index values are evaluated by comparisons with measured soil moisture. One model, based on the traditional antecedent precipitation index...

Ignition Noise in Neutron Moisture Gages
Spark-fired engines were found to couple spurious counts into neutron moisture gauges. Electromagnetic coupling to the cable connecting the probe unit and counter unit seemed to be the...

Effect of Moisture on the Strength of a Clean Sand
Fully-drained triaxial compression tests on samples of a clean river sand (Antioch sand) indicated that the soil was considerably stronger in the oven dry than in the saturated state....

Estimating Consumptive Use By the Munson P.E. Index Method

Irrigation Water Requirements of Lawns
Irrigation water requirements for lawn grasses can be estimated by an empirical formula when adequate climatological data are available. The modified Blaney-Criddle formula can be used...

Atmospheric Moisture-Precipitation Relations
Relationships are established between water vapor inflow, precipitable water depth, and surface precipitation, in Illinois, under average and extreme weather conditions. The water vapor...

Electrical Determination of the Moisture in Sand
Method of instantly and continuously measuring moisture content of sand in concrete mix; use of electric gage to register immediately moisture content of sand or any similar inert granular...

Shrinkage, Swelling and Creep in Cement
Reference is made to author's previous article, indexed in Engineering index 1958 p 175; active water theory is presented; it attributes phenomena considered to stress condition...

Shrinkage, Swelling and Creep in Cement
Reference is made to author's previous article, indexed in Engineering index 1958 p 175; active water theory is presented; it attributes phenomena considered to stress condition...

The Sudagai Underground Power Plant, Japan
Description of 46,000 kw project given; methods used in excavating and concreting underground powerhouse; model studies made for design of tailrace surge chamber and particular attention...

Moisture Conditions Under Flexible Airfield Pavements
Investigation of conditions under pavements on 13 airfields over period of several years indicates that base course and subgrade moisture contents become stabilized after about 2 yr; moisture...

 

 

 

 

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