Width at top in high dams from 7 to 20 ft.. Width at top in low damn......... = height.

Breast slopes.......... = 3 to l

Back slopes............ = 2 to 1

Height above surface of water not less than 3.5 feet.

Proportion Of Laborers In Bank. Fillers, And Wheelers In Different Soils, Wheelers Being Estimated For A Distance Of Fifty Yards

Getters.

Fillers.

Wheelers.

In loose earth.sand, etc

1

1

1

In compact earth..........

1

2

2

In marl.....................

1

2

2

Getters.

Fillers.

Wheelers.

In hard clay..............

1

1¼

1¼

In compact gravel........

1

1

1

In rock................

3

1

1