Table 3.

Irrigation frequency specifications (days yr^-1) corresponding to 2- and 10-year return period water deficits at Boston (BOS), New York (LGA), Washington (DCA), Chicago (ORD), and Atlanta (ATL). Specifications are given for a range of soil volumes (m³) and small and medium tree crown diameters (m).

		2-year return period					10-year return period
Crown diameter	Soil volume	BOS	LGA	DCA	ORD	ATL	BOS	LGA	DCA	ORD	ATL
6	2.6	93	97	103	93	111	100	110	114	108	123
6	7.7	27	27	29	25	31	30	32	34	30	36
6	17.0	10	10	10	9	11	12	12	13	12	14
6	23.8	6	5	7	5	7	8	8	8	8	9
2	0.17	107	115	120	108	127	117	123	129	121	136
2	0.60	28	29	31	27	34	32	33	36	33	38
2	1.28	11	10	12	10	13	13	13	15	13	14
2	1.87	6	5	7	5	7	8	8	8	8	10