CONTENTS. 



.^m 



CHAP. I AGE 



Preface id 



I. Introduction i 



II. Drainage by Gravitation 7 



III. Field Drainage „ 36 



IV. Drainage by Steam Power 50 



V. The Scoop Wheel 70 



VL The Archimedean Screw Pump SS 



VII. The Centrifugal Pump 92 



VIII. Description of Pumping Stations 106 



APPENDIX. 



TABLE 



I. — Explanation of terms used.. 158 



11. — ^Weights and measures relating to water; French weights 



and measures and their equivalents in English terms *. 158 



1 1 1. — Rules for ascertaining the pressure and velocity of water . . 1 60 



IV. — Formula for finding the velocity of water in open channels 161 



V. — For finding the quantity of water due to rainfall discharged 

 off the land, and the horse-power required for raising the 

 same 162 



VI. — For finding the discharge of water through sluices .. .. 162 



VII. — For finding the quantity of water due to twenty-four hours' 

 rainfall if discharged in a Hmited time owing to a sluice 

 being closed by the tide .. ,i .. .. 163 



VIII. — For ascertaining the time the doors of a sluice are closed 



by the tide 164 



IX- — For ascertaining the height of the tide at any hour during 



ebb and flood 165 



X.— For finding the horse-power required for pumping engines 166 



XL—Showing the dimensions and capacity of drains and sluices, 



and the area of land for which they are adapted .. .. 167 



