THE WATER mBLE IN THE lESTERM AND CENTRAL PAETS OF LONG ISLAND, NEBT TORK 



By C#E» Jacob 



INTRODUCTIOM 



Since Jamwxj 1952^ the Geological Stinray^ Fnited States Departmait of the 

 Interior^ has cooperated irith the New lork State Water Poirer and Control Coianiis- 

 sioBjp the Nassau Goimty Department of Piiblic Works^ the Suffolk County Board of 

 Sixpervisors^ and laore recently also nith the Suffolk County Water Authority^ in 

 an intensiTe study of the grouDd-nater resources of Long Island. This work is 

 under the general direction of 0» B# Meinaer, Geologist in Charge of the Divis-» 

 ion of Ground Water^ of the Water Resources Branch of the Stcrv^^ and under the 

 immediate superiTision of H* L« BrashearSj Jr»j Geologist in Charge of gzmind-* 

 water investigations in New lork and New England^ 



The continuing program has included the systeimatic measureiaent of water levels 

 in shallow observation wells on the islands The purpose of these Bieasxireiaents 

 has been in part to map the ground-watw table and to evaluate its fluctuations^ 

 whether natural ones resulting from variations in rates of precipitation^ evapora- 

 tion, and transpiration, or artificial ones resulting frcm pumping for municipal, 

 industrial, agricultural, or other usefti purposes* The contour map of the water 

 table presented in this areport represents in a sense the culmination of an effort 

 to expand a growing network of observation wells to cover most of Long Island^ 

 In another sense, however, it will merely serve as a guide, along with earlier 

 contour maps, pointing to a more complete and accurate map that may be obtained 

 by adequate coverage of the entire island by shallow test wells, and particularly 

 of the critical area in Brooklyn and western Queens • 



The present map has been made possible by the cooperative effort of many persons* 

 Mr# Km Fred Wels-di, Senior Engineer of the Nassau County Department of Public 



