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Author:
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 556
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Book Description
Author:
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 556
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Book Description
Author:
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 700
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Book Description
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 850
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Book Description
Author:
Publisher:
ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 872
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Book Description
Author: Dwight A. Smith
Publisher:
ISBN: 9780875952055
Category : History
Languages : en
Pages : 323
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Book Description
Handsome illustrations of more than two hundred bridges, including Columbia River Scenic Highway bridges, covered bridges, and magnificent coastal bridges.
Author: George H. Hargreaves
Publisher: Water Resources Publication
ISBN: 9781887201100
Category : Technology & Engineering
Languages : en
Pages : 202
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Book Description
IRRIGATION FUNDAMENTALS is a comprehensive text on the basic principles and practices of applied agricultural irrigation. Written over a period of more than 10 years, it is based on the authors'' extensive experience in farming, consulting, research, teaching, and other related agricultural activities. The book is for use by teachers of introductory courses in irrigation, farmers who have some basic technical knowledge, and for administrators who need a general understanding of irrigation as an aid for policy decisions in water resource development and planning. Various factors that influence crop yield and production including climate, fertility, water, drainage, and agronomic practices are addressed. The various irrigation methods such as border, basin, contour, furrow, sub, sprinkle, and drip or trickle are described; and conditions are given for selection of the appropriate method to use. Recent developments and new technology are included herein when they have obvious practical applications, but for the most part the material presented in this book is based on well established principles and practices. Much of the content is very practical and much is essentially nontechnical. Nevertheless, some of the material covered in this book goes beyond the basic concepts in an attempt to better describe the relationships and techniques employed by irrigation scientists and irrigation engineers.From the Preface: The future of the world depends very much on how we manage natural resources. Since the year 1900 there has been a ninefold increase in global carbon emissions from burning fossil fuels, and the world population has increased about 3.7 times in this century. Vast areas of forests have been destroyed, and irrigated lands now produce 40% of the food supply. Due to depletion of groundwater reserves and an increase in population, irrigated area per capita is declining. Consequently, the irrigation of additional alluvial lands is a strategic necessity for all of humankind. Much of the alluvial lands cannot be made productive without prior development of water resources through flood control, drainage, and irrigation. The production of electricity through hydropower and the production of alcohol fuel from irrigated crops, as has been practiced for many years in Brazil, can slow the increase in carbon emissions. Such diverse developments are typically not separable; rather, they must be considered as integral parts of a comprehensive development plan. The conservation of natural resources and increasing productivity of irrigated lands are also strategic necessities. Much of the current technology is highly transferable and crop yields can be significantly increased on lands already under irrigation.The authors have worked in many countries in connection with resource inventories, teaching, and the planning, development and use of irrigation as a tool for increasing production and providing employment. They have written extensively and have been honored for their achievements. They have considerable experience with everything from primitive low-technology irrigation developments to highly developed irrigation in the USA and in dozens of countries around the world. Both of the authors have dedicated their careers to teaching, research, and consulting in agricultural irrigation and water resources development and planning. It is their hope and expectation that this book will provide incentives for investigating and documenting land and water resources, improving development, increasing crop yields, conserving resources, and improving the environment. From the Table of Contents:Chapt. 1 - INTRODUCTION: Irrigation Fundamentals: - - A Definition of Irrigation - - Statistical Perspectives of Agricultural IrrigationChapt. 2 - FACTORS INFLUENCING CROP PRODUCTION: - - Introduction - - Temperature, Radiation, and Evaporative Potential - - Climate Change - - Soil Fertility and Fertilizers - - Water Availability and Distribution - - Soil Aeration and Drainage - - Plant Density, Spacing and Leaf Area Index - - Crop VarietyChapt. 3 - AGRICULTURAL SOILS: - - Introduction - - Soil Texture and Structure - - Soil Classification and Evaluation - - Bureau of Reclamation Land Classification - - Soil Age and Topography - - Soil Chemistry - - Infiltration Rates - - Soil-Water Relationships - - Equations for Soil Water Content - - Soil Water Potential - - Measuring Soil Water ContentChapt. 4 - EVALUATING IRRIGATION RESOURCES: - - Introduction - - Climate - - Hydrology - - Human and Other Factors - - Integrated DevelopmentChapt. 5 - IRRIGATION METHODS: - - Introduction - - Graded Border Irrigation - - Basin Irrigation - - Contour Levees - - Furrow Irrigation - - Sub-Irrigation - - Sprinkle Irrigation - - Drip or Trickle Irrigation - - Selecting an Irrigation Method - - Land Grading and Leveling - - Laser-Leveling Equipment and Practices - - Computing Diagonal Slopes - - Irrigation System EvaluationChapt. 6 - CROP WATER REQUIREMENTS: - - Introduction - - Direct Methods - - Indirect Methods - - Potential Evaporation - - Reference Evapotranspiration - - Extraterrestrial Solar Radiation - - Irrigation Requirements - - Crop CoefficientsChapt. 7 - IRRIGATION SCHEDULING: - - Introduction - - Allowable Water Depletion - - Monitoring Soil Water - - Scheduling Irrigations - - Rice Irrigation
Author: Findley Burns
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 40
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Book Description
Author: Maurice Hornocker
Publisher: University of Chicago Press
ISBN: 0226353478
Category : Science
Languages : en
Pages : 331
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Book Description
The cougar is one of the most beautiful, enigmatic, and majestic animals in the Americas. Eliciting reverence for its grace and independent nature, it also triggers fear when it comes into contact with people, pets, and livestock or competes for hunters’ game. Mystery, myth, and misunderstanding surround this remarkable creature. The cougar’s range once extended from northern Canada to the tip of South America, and from the Pacific to the Atlantic, making it the most widespread animal in the western hemisphere. But overhunting and loss of habitat vastly reduced cougar numbers by the early twentieth century across much of its historical range, and today the cougar faces numerous threats as burgeoning human development encroaches on its remaining habitat. When Maurice Hornocker began the first long-term study of cougars in the Idaho wilderness in 1964, little was known about this large cat. Its secretive nature and rarity in the landscape made it difficult to study. But his groundbreaking research yielded major insights and was the prelude to further research on this controversial species. The capstone to Hornocker’s long career studying big cats, Cougar is a powerful and practical resource for scientists, conservationists, and anyone with an interest in large carnivores. He and conservationist Sharon Negri bring together the diverse perspectives of twenty-two distinguished scientists to provide the fullest account of the cougar’s ecology, behavior, and genetics, its role as a top predator, and its conservation needs. This compilation of recent findings, stunning photographs, and firsthand accounts of field research unravels the mysteries of this magnificent animal and emphasizes its importance in healthy ecosystem processes and in our lives.
Author: Eric A. Stene
Publisher:
ISBN:
Category : Dams
Languages : en
Pages : 56
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Book Description
Author: Victor Golla
Publisher: Univ of California Press
ISBN: 0520266676
Category : History
Languages : en
Pages : 395
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Book Description
"Victor Golla has been the leading scholar of California Indian languages for most of his professional life, and this book shows why. His ability to synthesize centuries of fieldwork and writings while bringing forward new ideas and fresh ways of looking at California’s famous linguistic diversity will make this the primary text for anyone interested in California languages."--Leanne Hinton, Professor Emerita of Linguistics, University of California, Berkeley and author of How to Keep Your Language Alive “This book is a wonderful contribution that only Golla could have written. It is a perfect confluence of author and subject matter.”--Ives Goddard, Senior Linguist, Emeritus, Smithsonian Institution "Golla is a gifted polymath and California Indian Languages is certainly his landmark achievement, required reading for any linguist, archaeologist, ethnographer, or historian interested in aboriginal California."--Robert L. Bettinger, Professor of Anthropology, University of California Davis and author of Hunter-Gatherer Foraging "The preeminent figure in his field, Victor Golla has written a masterpiece filled with treasures for every audience: Indian communities working toward cultural and linguistic revival; general readers interested in the many cultures of Native California; and scholars in the fields of language, archaeology, and prehistory. The information here is so detailed that it supersedes all previous reference works."--Andrew Garrett, Professor of Linguistics, University of California Berkeley and Director, Survey of California and Other Indian Languages “This is a truly magnificent work, at once authoritative, comprehensive, accessible to a wide readership, and fascinating. Masterfully integrating linguistic, archaeological, historical, and cultural information, the author describes not just the languages, but also the major figures in the story: speakers, explorers, missionaries, and scholars. It is beautifully written, a great pleasure to read, and difficult to put down."--Marianne Mithun, author of The Languages of Native North America
