APPENDIX E: HYDROGEOLOGIC CONSIDERATIONS OF ZONE OF CONTRIBUTION METHODS 

 Cape Cod Aquifer Management Project Final Report Page E-19 



Table 8. Estimation of Ground-Water Recharge by the Water-Balance Method 

 (from Strahler, 1972) . 



Rjinnla, Mass, 



TEAF 



Potentl«l e»«po-- 0.0 0.0 0.3 1.3 2.9 U.l 5.3 U.6 3.U 2.1 0.9 0.1 25.2 



tr»nsp Irstlon, 

 incnes 



Precipitation, 4.2 3.5 U.2 3.6 3.1 3.U 2.U 3.7 U.3 3.6 3.3 3.5 U2.8 



Inches 

 (2931-1952) 



Water surplus U.2 3.5 3.9 2.3 0.2 - - - 0.9 1.5 2.1* 3.1* 22.3 



Water deficit _ . - _ - 0.7 2.9 1.1 - - - - U.7 



RecharRe ( 22.3-4.0) 16.3 



Province town (Mass. 



JFMAMJJASOND YEAR 



Potential evapo- 0.00 0.00 0.35 1.26 2.8? U.21 5.35 U.92 3.U2 2.13 0.9U 0.20 25.69 



trsnspl ration, 

 Inc nes 



PPBClcltatlon, U.19 3.03 U.IO 3.38 2.55 U.U5 2.30 2.66 k.hB 3.50 2.98 3.U6 U0.26 



Inches , 

 (1931-=;2) 



Water surplus li.l9 3.03 3.75 2.12 - - - - 1.06 1.37 2.0l| 3.U4 21.00 



Vater deficit _ _ - . 0.32 0.76 3.05 2.06 - - - - 6.19 



Recharge ( 21.00 - U.OO) 17.00 



* Data for Ifyannls rounded to one deOinal place 



Reference: C.W.Thomthwalte , 1946, An Approach Toward a Rational Clasalflro tlon of Cllnate 

 Oeor.TBphlcal Review, vol.37, pp.55-9U. 



Data of temperature nnd precipitation from U.S.W.B. Climatic Sirmary of United Stutes, 

 Suprlonent 1931-52, New England, pp. 11-23. 



