CONTENTS 



Chapter 



I. 



II. 



III. 



IV. 



V. 



VI. 



VII. 



VIII. 



IX. 



X. 



XI. 



XII. 



XIII. 



XIV. 



XV. 



XVI. 



XVII. 



XVIII. 



XIX. 

 XX. 



XXI. 

 XXII. 



Introduction 



Page 

 13 



PART I— AGRICULTURAL SURVEYING 



Definitions and Uses of Surveying . 

 Measuring— The Use, Care, and Adjustment of 



the Instruments 



Field Methods 

 Map Making 



16 



18 

 24 



28 



Computing Areas 34 



The United States Public Land Survey . . 38 



Instruments for Leveling; Definitions . . 42 



Leveling Practice 49 



PART II— DRAINAGE 



Principles of Farm Drainage 

 The Preliminary Survey . 

 Laying Out the Drainage System 

 Leveling' and Grading Tile Drains 

 Capacity of Tile Drains 



Land Drainage 



Construction of Tile Drains 



Open Ditches 



Drainage Districts 



PART III— IRRIGATION 



History, Extent, and Purpose of Irrigation . 



Irrigation Culture 



Supplying Water for Irrigation .... 

 Applying Water for Irrigation 

 Irrigation in Humid Regions and Sewage Dis- 

 posal 



56 

 64 

 67 

 73 

 78 

 86 

 96 

 103 

 108 



111 

 115 

 122 

 129 



136 



