146 GEOLOGICAL SURVEY OF NEW JERSEY. 



Appended is a list of the authorities from which the above 

 data are drawn : 



AUTHORITIES AND REMARKS. 



Metnmac. Reports of Massachusetts Board of Health, 1892 to 1898, in- 

 clusive, give the run-off. Rain- fall and temperature are compiled 

 from records of U. S. Weather Service and New England Weather 

 Service. 



Sudbury, Cochituate and Mystic. - From Nineteenth Annual Report of the 

 Boston Water Board. The Cochituate record begins in 1863, but the 

 early years seem less reliable, so that I have used the record from 

 1875, making it cotemporaneous with the Sudbury. 



Connecticut From Results of Stream Measurements, U. S. Geological 

 Survey, 1895. The year 1871 is incomplete while 1873, 1874 and 1876 

 show run off from December to May so largely in excess of rain-fall 

 that I have rejected them in making up the averages. Temperature 

 from U. S. Weather Records. The original stream gaugings were 

 made by the U. S. Engineer at Hartford 



Croton (/). Originally compiled for the Report on Water-Supply, pub- 

 lished by the Geological Survey of New Jersey in 1894. Run-off 

 from Reports of Department of Public Works, of New York City. 

 Corrected for amounts drawn from or supplied to storage. Area of 

 catchment 353 square miles, from survey made by the author, for 

 New Croton Aqueduct Commission, which survey is based on 

 accurate triangulation, and area is computed geodetically. The area 

 long in use by Department of Public Works is 338 square miles 

 based on a traverse survey, necessarily less accurate. The use of the 

 correct area is important in this connection, as it makes the depth 

 of run-off4.4 per cent, less than that given in the department estimates. 



Croton (2}. These figures are taken from the Report of the Croton Aque- 

 duct Commission, 1887-1895. The depth of the run-off is corrected to 

 conform to the correct area, 353 square miles, as above described. 



Upper Hudson. From MS. furnished by Geo. W. Rafter, C. E. 



Genessee. From MS. furnished by Geo. W. Rafter. C. E. These and the 

 Upper Hudson records are the ones referred to by him in a paper 

 on " Stream-flow in Relation to Forests." Proceedings American 

 Forestry Association, Vol. XII. 



Hemlock. Lake. Measurements made by the Rochester Water Department 

 and furnished by J. Nelson Tubbs C. E. 



Skaneateles Lake. Run-off from records of the Syracuse Water Depart- 

 ment. Rain-fall and temperature from records of New York State 

 Weather Service. 



Hackensack. Run-off from records of Hackensack Water Co. . Reorganized. 

 Chas. B. Brush, engineer. 



Passaic Run-off from records originally used for Report on Water-Supply, 

 Geological Survey of New Jersey, 1894, which have been re-computed 

 and checked. 



