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Some Needs for Irrigation Research in Czechoslovakia
In association with the changes in agrarian and social policy in Czechoslovakia under conditions of economic reform, a transformation of agricultural enterprise has been taking place....

Modeling the Distinction Between Regional Flow and Flow to Drains
Previous research at the Newlands Agricultural Research Center, in Fallon, Nevada, suggests that the quality of the water flowing to the 15 subsurface drain laterals in related to the...

Optimizing Conjunctive Water Use in a Dynamic Stream-Aquifer System with US/REMAX
Long-term water management planning models frequently use large time steps and must employ fairly crude assumptions (such as average climatic conditions, etc.). Managing stream aquifer...

Water Distribution Plan Utah Lake/Jordan River Basin
The Utah Lake/Jordan River basin is comprised of several river systems that are hydrologically related but, for the most part, have been managed and operated separately. To further complicate...

Sediment Entrapment by Stream Channel Vegetation
Degraded headwater streams are common in the mountainous West. They have experienced a variety of stresses from public and private uses and will require specific management consideration...

Primary Metals and Criteria for Water use in the Columbia River, British Columbia
We assessed primarily concentrations of lead, cadmium, copper, zinc and water hardness in the Columbia River between Birchbank and Waneta. Water quality in this reach of the river is affected...

Impacts of Potential Climate Change on Colorado-Big Thompson System Operations
The objective of this study is to examine the response of the Colorado-Big Thompson (CBT) system to specific local changes in climate, using the model CBTAOP to project the operating plan...

Chaos Characteristics of Tree-Ring Series
Thirteen tree-ring series from the Salt and Verde River basins in Arizona are studied to distinguish between chaos and randomness. A chaotic moving average model that represents the time...

Spatial and Temporal Precipitation Characteristics in Southwest Idaho
The USDA-ARS, Northwest Watershed Research Center operates a precipitation gage network on the Reynolds Creek Experimental Watershed in southwest Idaho. Analysis of the 30-yr (1962-1991)...

Application of Distributed Parameter Watershed Model for Determining the Effects of Climate Change on Water Resources
Projected scenarios of climate change are likely to have significant effects on hydrology and water resources in the semi-arid western United States. The paper describes the application...

Climate Change: Is Trouble Ahead for Water Engineers?
Very long range forecasts of future global warming from 2 to 5?C have been made as a result of the increase in carbon dioxide and trace gases in the atmosphere due to man's activities....

Effect of Agricultural Drainage on Water Quality in the Mid-Atlantic States
Agricultural drainage development in the form of drainage alone and controlled drainage-subirrigation (CD-SI) has created conflicts with environmental concerns. Most concerns the lack...

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...

Evaporation Pond Hydrology
Drainwater evaporation ponds are impoundment facilities designed for drainwater disposal by evaporation. In California, these ponds are typically constructed on the clay soils of the western...

Development of a Selenium TMDL for the San Joaquin River
The objective of this study is to devise a user-friendly, reliable method to calculate a screening-level 'Total Maximum Daily Load' (TMDL) for the San Joaquin River and similar western...

A GIS Approach for Studying Irrigation Management Alternatives to Reduce Salt Loading of River Basins
As part of an ongoing effort to improve the water quality of the Colorado River, many methods have been employed to analyze the overall benefits of alternate irrigation management practices...

Managing Irrigation in the Presence of Groundwater
A method was developed to use lysimeter data for groundwater contribution to crop water use in the irrigation scheduling procedure for a subsurface drip irrigated field underlain by shallow...

Irrigating Lettuce with Buried Drip, Surface Drip, and Furrow Irrigation Systems: Overall Performance
Groundwater nitrate contamination is a major concern in the Salinas Valley of California. The source of much of the nitrate appears to be vegetable production in the valley. A field-scale...

Distribution and Mobilization of Dissolved Selenium in Ground Water of the Irrigated Grand and Uncompahgre Valleys, Western Colorado
Distribution of dissolved selenium in ground water of the irrigated Grand and Uncompahgre Valleys is affected by the aqueous geochemical environment of the shallow ground-water system...

Planning for Remediation of Irrigation-Induced Water Quality Problems in the Middle Green River Basin, Utah
Reconnaissance investigations and detailed studies between 1986-1990 under the National Irrigation Water Quality Program of the Department of the Interior identified and quantified elevated...

 

 

 

 

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