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Articles 871 - 900 of 1349

Full-Text Articles in Hydrology

Saltland Drainage : Case Studies, P R. George, R A. Nulsen Jan 1985

Saltland Drainage : Case Studies, P R. George, R A. Nulsen

Journal of the Department of Agriculture, Western Australia, Series 4

Over the past five years farmers have become increasingly interested in the use of drainage to overcome saltland problems.

Experimental work by the Department of Agriculture on sub-surface drainage includes tube drainage and drainage by pumping. The Department is also monitoring the performance of open drains installed by farmers. Major sites are at Esperance, Dalwallinu, Namban and Watheroo.

Some of these projects have been reported in an earlier issue of the Journal of Agriculture. In this article P. R. George, Research Officer and R. A. Nulsen, Principal Research Officer with the Salinity and Hydrology Research Branch, discuss recent results from …


Drainage To Control Waterlogging, D J. Mcfarlane, T R. Negus, J W. Cox Jan 1985

Drainage To Control Waterlogging, D J. Mcfarlane, T R. Negus, J W. Cox

Journal of the Department of Agriculture, Western Australia, Series 4

Drains can be classified in several ways. Drains on flat land have similar drainage effects on either side of the drain and are called relief drains. Drains on sloping land intercept seepage water moving down hillsides and therefore have most effect on the downslope side. They are called interceptor drains.

Drains can also be classified as being open drains (that is, open at the ground surface) or buried drains (for example, tube drains).


Draining Irrigation Areas, K S. Cole, J P. Middlemas Jan 1985

Draining Irrigation Areas, K S. Cole, J P. Middlemas

Journal of the Department of Agriculture, Western Australia, Series 4

Many irrigation schemes throughout the world have turned into unproductive saline flats and swamps. This dramatic change can occur within a few years of irrigation starting and has been part of irrigation schemes from earliest times up to the present day.

The main cause of this salinisation is normally excess irrigation water use combined with poor drainage. Any form of waterlogging will have an adverse effect on plant growth.


Assessment Of Waterlogged Sites, D J. Mcfarlane Jan 1985

Assessment Of Waterlogged Sites, D J. Mcfarlane

Journal of the Department of Agriculture, Western Australia, Series 4

Soil is said to be waterlogged if any part of the plant root zone is saturated with water. In severe cases soil is saturated to the surface and waterlogging is obvious. Waterlogging is distinguished from flooding in which surface runoff brings down water from higher up in a catchment. However, flooding may result in waterlogged sites.


Atlas Illustrating The Characteristics Of Groundwater In Nebraska, Vince Dreeszen Jan 1985

Atlas Illustrating The Characteristics Of Groundwater In Nebraska, Vince Dreeszen

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.


Annual Outflow Of Water From Nebraska, 1950-1984, Conservation Survey Division Jan 1985

Annual Outflow Of Water From Nebraska, 1950-1984, Conservation Survey Division

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.


Estimate Of Self-Supplied Domestic Water Use In Nebraska During 1980, E.K. Steele Jan 1985

Estimate Of Self-Supplied Domestic Water Use In Nebraska During 1980, E.K. Steele

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.


Transmissivity Of The Principal Aquifer In Nebraska Jan 1985

Transmissivity Of The Principal Aquifer In Nebraska

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.


Concentration Of Nitrate-Nitrogen In Groundwater Central Platte Region, Nebrask 1984, M. E. Exner Jan 1985

Concentration Of Nitrate-Nitrogen In Groundwater Central Platte Region, Nebrask 1984, M. E. Exner

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.


Thermal Infrared Remote Sensing Of Near-Surface Moisture: A Case Study In The Nebraska Sandhills, L. P. Queen, D. C. Rundquist, M. P. Lawson Jan 1985

Thermal Infrared Remote Sensing Of Near-Surface Moisture: A Case Study In The Nebraska Sandhills, L. P. Queen, D. C. Rundquist, M. P. Lawson

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.


Water Supplies : Dams And Roaded Catchments, W J. Burdass, T. R. Negus, A. L. Prout, I. A. F. Laing Jan 1985

Water Supplies : Dams And Roaded Catchments, W J. Burdass, T. R. Negus, A. L. Prout, I. A. F. Laing

Journal of the Department of Agriculture, Western Australia, Series 4

Western Australia's Upper and Lower Great Southern statistical areas include most of the broad-scale agricultural land south of a line from Perth to Hyden. Much of the area is well-developed and carries 13.4 million sheep, 203 00 cattle and 95 000 pigs, almost half the State's livestock.

There are few natural rivers and lakes to water livestock in summer and much of the bore water is salty. On-farm waterr conservation, therefore, consits mainly of excavated earth tanks (dams) which are filled by surface runoff or shallow seepage. In the drier areas and in the sandplain roaded catchments have neen built …


Drainage Prospects For Saline Wheatbelt Soils, P R. George Jan 1985

Drainage Prospects For Saline Wheatbelt Soils, P R. George

Journal of the Department of Agriculture, Western Australia, Series 4

Sub-surface or groundwater drainage by buried tube drains or open ditches can reclaim saltland in the Western Australian wheatbelt. However, this method is expensive and not all sites can be drained cost-effectively. Each drainage site is unique, so careful investigation of each site is essential before recommendations on drainage method and design can be made.


Significant Rises And Declines In Nebraska Groundwater Levels (From Pre-Development As Of Fall 1984)/Registered Irrigation Wells In Nebraska (As Of January 1, 1985, Conservation Survey Division, U.S. Geological Survey Jan 1985

Significant Rises And Declines In Nebraska Groundwater Levels (From Pre-Development As Of Fall 1984)/Registered Irrigation Wells In Nebraska (As Of January 1, 1985, Conservation Survey Division, U.S. Geological Survey

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.


Irrigation Water Diagram Jan 1985

Irrigation Water Diagram

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.


Airborne Thermal Mapping Of A "Flow-Through" Lake In The Nebraska Sandhills, Donald Rundquist, Gene Murray, Lloyd Queen Jan 1985

Airborne Thermal Mapping Of A "Flow-Through" Lake In The Nebraska Sandhills, Donald Rundquist, Gene Murray, Lloyd Queen

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.


Annual Outflow Of Water From Nebraska, 1950 - 1985 And Annual Inflow Of Water To Nebraska, 1950 - 1985, Conservation And Survey Division Jan 1985

Annual Outflow Of Water From Nebraska, 1950 - 1985 And Annual Inflow Of Water To Nebraska, 1950 - 1985, Conservation And Survey Division

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.


Geology Of Ponca State Park, Nebraska, Roger K. Pabian, Dennis R. Lawton Dec 1984

Geology Of Ponca State Park, Nebraska, Roger K. Pabian, Dennis R. Lawton

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.


Inventory Of Irrigation Water Use Box Butte County, Nebraska 1981, Dennis R. Lawton, Larry L. Teahon Jul 1984

Inventory Of Irrigation Water Use Box Butte County, Nebraska 1981, Dennis R. Lawton, Larry L. Teahon

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.


Groundwater Levels In Nebraska, 1983, Martin S. Johnson, Darryll T. Pederson Jun 1984

Groundwater Levels In Nebraska, 1983, Martin S. Johnson, Darryll T. Pederson

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.


Plant Collections For Saltland Revegetation And Soil Conservation, A J. Clarke, T C. Swaan, C V. Malcolm Jan 1984

Plant Collections For Saltland Revegetation And Soil Conservation, A J. Clarke, T C. Swaan, C V. Malcolm

Technical Bulletins

In 1967, during an overseas plant exploration trip, seeds of plants of reputed salt tolerance and forage value were obtained from seven countries. Since 1971, over 600 plants have been added to the original collection of 343 plants already under observation for suitability for forage production in saline and arid areas. Additions to the test programme since 1971, include shrubs from Algeria; Argentina; Australia; Chile; England; Iran; Israel; Libya; Morocco; Netherlands; Russia; South Africa; Spain; Tunis and the United States of America. This Bulletin includes details of all plant collections from 1966 to December 1983.


Soil Conservation Research In New South Wales And Its Significance To Research On Water Erosion In Western Australia, D J. Mcfarlane Jan 1984

Soil Conservation Research In New South Wales And Its Significance To Research On Water Erosion In Western Australia, D J. Mcfarlane

Resource management technical reports

No abstract provided.


Water Erosion On Potato Land During The 1983 Growing Season Donnybrook, D J. Mcfarlane Jan 1984

Water Erosion On Potato Land During The 1983 Growing Season Donnybrook, D J. Mcfarlane

Resource management technical reports

Soil losses over a three month period varied from 10 to 49 mm.. Soil loss was most highly correlated with length of slope of the plots. Other important factors appeared to be slope angle and soil textures. Grade furrows appear to be the best method of breaking-up long slope lengths. The low capacity of the furrows requires them to be on grades of about 4 to 4 per cent to prevent siltation and overtopping during high density storms.


Annual Outflow Of Water From Nebraska, 1950-1983, Conservation Survey Division Jan 1984

Annual Outflow Of Water From Nebraska, 1950-1983, Conservation Survey Division

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.


Soil Types And Drainage, Eric Bettenay, N. J. Schofield Jan 1984

Soil Types And Drainage, Eric Bettenay, N. J. Schofield

Journal of the Department of Agriculture, Western Australia, Series 4

At least 90 per cent of the phosphorus entering the Peel-Harvey estuarine system comes from land cleared for agriculture, most of it from the coastal plain. These soils are naturally deficient on phosphorus and sulfur and this is supplied in superphosphate, which contains about 10 per cent phosphorus and 1 percent sulphur.

However, rain leaches some of this applied phosphorus from the land into drains and rivers which flow into the estuary. In 1981, farmers in the Harvey River-Mayfields Drain catchment lost the equivalent of 1,300 tonnes of superphosphate into the estuary. Between them they have in effect spent $120,000 …


1984 County Gravity Survey, Complete Gravity Listings, Raymond R. Burchett Jan 1984

1984 County Gravity Survey, Complete Gravity Listings, Raymond R. Burchett

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.


Annual Installation Of Irrigation Wells In Nebraska Through 1983, Conservation Survey Division Jan 1984

Annual Installation Of Irrigation Wells In Nebraska Through 1983, Conservation Survey Division

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.


Annual Departures From Average Annual Precipitation In Nebraska, 1850-1983, Conservation Survey Division Jan 1984

Annual Departures From Average Annual Precipitation In Nebraska, 1850-1983, Conservation Survey Division

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.


Annual Departures From Average Annual Precipitation In Nebraska, 1850-1983, Conservation And Survey Division Jan 1984

Annual Departures From Average Annual Precipitation In Nebraska, 1850-1983, Conservation And Survey Division

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.


Inventory Of Irrigation Water Use In Box Butte County, Nebraska 1981, D. R. Lawton, L. L. Leahon Jan 1984

Inventory Of Irrigation Water Use In Box Butte County, Nebraska 1981, D. R. Lawton, L. L. Leahon

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.


Dakota Aquifers In Eastern Nebraska, Aspects Of Water Quality And Use, D. R. Lawton, O. Goodenkauf, B. V. Hanson, F. A. Smith Jan 1984

Dakota Aquifers In Eastern Nebraska, Aspects Of Water Quality And Use, D. R. Lawton, O. Goodenkauf, B. V. Hanson, F. A. Smith

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.