Table 4 Environmental characteristics distribution of tributary weirs ( > 13.3 ha) in the Songgu IDCL

From: Spatial form and formation process of irrigation district cultural landscapes: the Songgu irrigation District, Zhejiang, China

Elevation

Quantities

Per Cent

Slope

Quantities

Per Cent

<120 m

1

2.50%

<1°

3

7.50%

120～140 m

5

12.50%

1°～3°

21

52.50%

140～160 m

9

22.50%

3°～5°

7

17.50%

160～180 m

13

32.50%

5°～7°

4

10.00%

180～200 m

6

15.00%

7°～9°

2

5.00%

>200 m

6

15.00%

>9°

3

7.50%

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