20 



BULLETIN 114, U. S. DEPARTMENT OF AGRICULTURE. 



Table 4. — Summary of cost data — Continued. 

 BLACK SWAMP WATERSHED. 



Excavation. 



Cubic 

 yards, at 

 8 cents. 



Black Swamp 201,170 



Wolf Bay 



Causeys Branch 



Titi Branch 



Long Branch 



Lyas Bay 



Ballifore Branch 



Rose Hill Branch . . . 

 Laterals (18) 



Total for Black 

 Swamp water- 

 shed 



Cubic 

 yards, at 

 10 cents. 



Cubic 

 yards, at 

 25 cents. 



5,280 



IS, 425 



16,275 



17, 900 



9,900 



7,000 



7,600 



86, 175 



Cost. 



S20, 894 

 9,932 

 4,606 

 4,069 

 4,475 

 2,475 

 1,750 

 1,900 

 21,544 



Bridges. 



$2,500 



2,900 



1,000 



500 



1,500 



1,000 



500 



500 



5,000 



71,645 15,400 



Right of 



way, at 



§10 per 



acre. 



SI, 070 



390 



130 



110 



120 



70 



50 



50 



590 



2,580 



Engi- 

 neering 

 and legal, 



at 10 

 per cent. 



$2, 446 



1,322 



674 



468 



610 



355 



230 



■245 



2, 713 



8,963 



Total. 



$26, 910 

 14, 544 

 6,310 

 5,147 

 6,705 

 3,900 

 2, 5.30 

 2,695 

 29, 847 



98,588 



INDEPENDENT WATERSHEDS. 







92, 620 

 121,990 

 109,910 





$9,262 

 13,519 

 12,311 

 2,925 

 12,562 



$4,000 

 1,600 

 1,600 

 1,000 

 1,000 



$380 



530 



480 



90 



350 



$1, 364 



1,565 



1,439 



402 



1,391 



$15,006 







5,280 



5,280 



11,700 



50,250 



17,214 







15, 830 







4,417 



Laterals (10) 







15, 303 











Total for inde- 

 pendent water- 









50, 579 



9,200 



1,330 



6,161 



67, 770 













Total for the drainage district, $371,598. 

 Number of acres in district, 67,642. 

 Average cost per acre, $5.50. 



The total cost of the 66 lateral ditches has been estimated above 

 as $114,232. Omitting these, the cost of ditching only the two main 

 swamps and the principal tributaries would be, as estimated, $257,366, 

 or $3.80 per acre. It is strongly recommended, however, that the 

 laterals be constructed, as well as the main ditches. 



MAINTENANCE. 



Not much work should be required to keep the ditches in condition 

 after they are constructed. The velocity of flow due to large fall in 

 most of the ditches will assist materially in keeping down the growth 

 of vegetation in the channels. However, an organized method of 

 inspection should be adopted in the district whereby each ditch will 

 be examined at least once each year, preferably just before the rainy 

 season. Any obstructions should be removed and any damage to the 

 ditches should be repaired as soon as noted. If maintenance work is 

 given prompt attention, the defects can be remedied with compara- 

 tively little expense; but if it is neglected, the task will become a 

 formidable one, and in the meantime the efficiency of the drainage 

 system will be reduced. 



