TasLe 43.—Sample computation of realizable mean annual growth 
| | | | 
Assumed depletion, 1933-62, Part of Areas assumed to restock 
Iv erealwacverse leACrer: by decades rene | Eooaed in 1933-62 
‘ age age age Area in ype aera 
Line No. Type site age in | stock- 1933 peek Nes site | 
it 1 i emain- Ss | 
quality mp1983/5)/fSing 1933-42 | 1943-52 | 1953-62 | ingin | in 1963 | 1933-42 | 1943-52 | 1953-62 
1963 
(@)) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) 
| | | 
Years |Percent| Acres Acres Acres Acres Acres Acres Acres Acres Acres 
HU Je 5 sei tore ee a ae bas 300,000 | 120,000} 100,000) 60,000] 20,000] 18,000)... | 
6 
A Total annual growth on areas depleted Total Distribution of total annual 
t IN t p stribution of total annu 
ears en Dr sl eT OwUn iT ave) Der acre during— annual growth by decade— 
Line No. attained TE ee 
by tends A ik assumed 
pleted | iy ter verage verage 
after 1962 | 1933-42 1943-52 1953-62 life 1933-42 1943-52 1953-62 life ere: 1933-42 | 1943-52 1953-62 
(1) (15) (16) (17) (18) (19) (20) (21) (22) (28) (24) (25) (26) (27) 
Cubic Cubic Cubic Cubic M cubic | M cubic | M cubic | M cubic | M cubic | M cubic | M cubic | M cubic 
Years feet feet feet feet feet Jeet feet feet feet feet -| — feet feet 
4, 608 9, 216 
pee eee 3, 960 
4, 805 3, 980 
1, 009 2,018 
Re uae 783 
35, 998 33, 170 
487 974 
Peo ee a 1,032 
18, 561 17, 391 
768 1, 536 
eee 594 
30, 080 30, 080 
| 95, 964 104, 734 
| | 
| 
annual growth rate for ages 90 to 119 years, inclusive, was 
similarly adjusted for stocking. 
In line 4 the entry in column 25 is the sum of those in 
columns 20, 21, 22, and 23; the entry in column 26 is the sum 
of those in columns 21, 22, and 23; and the entry in column 
27 is the sum of those in columns 22 and 23. 
In the calculations for type 8 area as in those for type 6 
area, 80 percent of the portion depleted each decade is 
assumed to restock by the midpoint of the following decade. 
The growth figured on the restocking areas is mean annual 
growth for the period from time of restocking until 2032. 
Results of this computation are shown in lines 5 and 6. 
The procedure in growth calculations for the other types 
is essentially similar in detail to that already described. 
The sums of columns 25, 26, and 27, shown in line 15, 
are realizable mean annual growth for the decades 1933-42, 
1943-52, and 1953-62, respectively, for the aggregate of 
type areas in the sample unit. 
