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). 



