DRAINAGE OF BLACK AND BOGGY SWAMPS, S. C. 7 
The principal industry of the people of the district is farming; but 
only a small part of the land available for this purpose is now being 
utilized, due to the sparsely settled condition. The chief money 
crop of the district is cotton, and the greater part of the acreage 
under cultivation is planted to it. The other crops grown are prin- 
cipally corn, oats, hay, and watermelons. Labor conditions in the 
district are not of the best, but notwithstanding this drawback very 
good crops are obtained, due to intelligent methods of cultivation 
and fertilizing. The growing of truck crops might become very 
profitable by the utilization of artesian water for irrigation. There 
are already a number of these wells scattered over the district, all 
of which are bold, flowing wells from 900 to 1,000 feet deep. 
THE SURVEY. 
The survey was made from camp by a party under the direction 
of F. G. Eason. Field work was begun August 2, 1912, and com- 
pleted November 14, 1912. The principal roads of the district were 
traversed by compass and stadia, ground surface elevations being 
taken at intervals of about 500 feet. All the branches, swamps, and 
watercourses were meandered by stadia and compass, and sufficient 
elevations were taken in them to secure the data necessary for the 
proper location of the ditches. Levels were run entirely across the 
district, usually east and west, at intervals of about one-half mile, 
and these lines were tied to all other level lines crossed. Levels 
were also run along both railroads. 
After the edges of Boggy Swamp and Black Swamp had been 
surveyed, the locations of the proposed ditches in them were deter- 
mined by means of compass and steel-tape measurements, except 
from station to station 150 on Boggy Swamp and from station to 
station 62 on Black Swamp. On the located lines stakes properly 
marked were set at intervals of 100 feet; substantial hubs were set 
about 500 feet apart and at angles in the line; and the trees along the 
lines were well blazed. Profile levels were run over these lines, eleva- 
tions being taken every 100 feet. The Black Swamp and Boggy 
Swamp ditches were the only ones located in the field; the other 
ditch lines shown on the map were not surveyed. 
The datum for the levels is sea level as secured from the Seaboard 
Air Line Railway, taking the elevation of top of rail at Scotia and run- 
ning all levels from that point. Bench marks were set along the main 
roads and at other prominent points, usually on roots of trees suitably 
inscribed. Three standard iron and bronze Drainage Investigations 
bench marks were set, one each at Scotia, Brighton, and Robertville. 
The data secured in the survey are shown on the accompanying map 
and profile (figs. 2 and 3). 
