9 



the QueeBS^-Nassati Cotmty line this BrooKlyn overdraft had lowered the grtmM*- 

 Tfater leirel by maiy feet# Hoir far into Nassau Cotrnty that effect went and 

 whether it extended to Suffolk iras not then (1955) known*® One object of the 

 studies made in 1956 nas to fill in this gap^ but again perched water-table ecm?- 

 ditions presented a serious handicap* With the fttnds available and with the t±mB 

 aCLlotted it was not then possible to drill the necessary deep test holes to de- 

 terMne the true position of the main water table in the center of the island* 

 Suter repeated the warnings given in both the Burr-Hering-'Freemaia aiod Spear re- 

 ports^ in the following words: ««?here is ever present danger that in hills^ along 

 the M>raines and in disturbed strata generally levels may be taken in wells 

 piearcing perched water deposits and so fail to indicate the tame tapper surface of 

 the wain body of grotind water*" ( (11)^ p* 51)* This reseanration teB5)ered his 

 simimation (p* SO) of the restilts of the investigation just then cosopleteds 

 "Latest infcrmation showed aaterial dianges for the worse in the peiiod 19S5-19S6* 

 Not only has the Brooklyn depression gone down - - as was ejected - - but the 

 depressed area has extended far to the east into Queens County^ The effects in 

 Nassau Cotanty are serious and there can be no doubt but that they artend even 

 into Suffolk^ altho"ugh somewhat masked by the difficulty of avoiding perched 

 water tables in the ranges of hills near the county line.** (Underscoring is ours«) 



Deep observation wells drilled 3Biore recently in that area passed through the 

 perched water tables and reached the Bain laater table* As discussed more ftilLy 

 below, it now appears that the effect of puaping in Brooklyn has not extended 

 to Suffolk County* The apparent declxDe of the water table at the Nassau-Suffolk 

 Cotinty line is attributable first to the fact that the early maps coiAoured 

 perched water tables, and secondly, to differences ia antecedant precipitation* 



