102
Extent of Canalization and Surface Fitting of Fields.
in China, Korea and Japan equal to eight times the number represented in Fig. 52. Fully 200,000 miles in all. Forty canals across the United States from east to west and sixty from north to south would not equal, in number of miles those in these three countries today. Indeed, it is probable that this estimate is not too large for China alone.
Fig. 53.—Sketch map of northeast China showing the alluvial plain and the Grand Canal, extending 800 miles through it from Hangchow to Tientsin. The unshaded land area lies mostly less than 100 feet above sea level.
As adjuncts to these vast canalization works there
have been enormous amounts of embankment, dike and
