. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE 1 BULLETIN No. 339 -tcSJt^tJ.'—* Contribution from Office of Public Roads and Rural Engineering ^Jp'^rSL LOGAN WALLER PAGE, Director. Washington, D. C. PROFESSIONAL PAPER April 21, 1916 EXPERIMENTS ON THE ECONOMICAL USE OF IRRIGATION WATER IN IDAHO. By Don H. Bark, Irrigation Engineer. CONTENTS. Page. Introduction Plan of investigation Weather conditions in Idaho during the in- vestigation Results obtained during 1910, 1911, 1912, and 1913 Measurement of water used on farms and u
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE 1 BULLETIN No. 339 -tcSJt^tJ.'—* Contribution from Office of Public Roads and Rural Engineering ^Jp'^rSL LOGAN WALLER PAGE, Director. Washington, D. C. PROFESSIONAL PAPER April 21, 1916 EXPERIMENTS ON THE ECONOMICAL USE OF IRRIGATION WATER IN IDAHO. By Don H. Bark, Irrigation Engineer. CONTENTS. Page. Introduction Plan of investigation Weather conditions in Idaho during the in- vestigation Results obtained during 1910, 1911, 1912, and 1913 Measurement of water used on farms and under complete canal systems Seepage investigation Survey of waste land in Idaho Proper duty of water for Idaho 43 47 52 56 INTRODUCTION. This bulletin contains the results of experiments made in coopera- tion with the State Land Board of Idaho to determine the quantities of water needed to produce the ordinary farm crops on the types of soil common to that State. The experiments, in addition to investi- gations strictly bearing on such irrigation requirements, included certain supplementary investigations. The irrigation-requirement experiments extended from 1910 through 1913 and consisted in applying different quantities of water to plots receiving similar treatment except for this factor. It is con- sidered that these experiments fix within reasonable limits the amount of water which must be delivered to fields to produce profit- able crops under the conditions described. The supplementary experiments were made for the purpose of determining how much additional water must be allotted to cover waste and losses between the point of diversion and the fields to be irrigated. The conclusions contain a discussion of the factors affecting irriga- tion requirements in actual practice. Note.—The work on which this bulletin is based was done under a cooperative agreement between the Office of Experiment Stations and the State Land Board of Idaho, several of the canal companies and
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