Table 20. — Wood groivth, water yield, quality ivater yield, storm runoff, and sediment by ecogroup 



in 1970 and under Alternative 19 

 (Totals may not add due to rounding) 





Unit 



Ecogroup 







Item 



Western Range 



Western Forest 



Great Plains 



Eastern Forest 



National 

 Totals 





1970 



Alt. 19 



1970 



Alt. 19 



1970 



Alt. 19 



1970 



Alt. 19 



1970 



Alt. 19 



Wood growth 



Water yield 



Quality water 



Storm runoff 



Sediment 



Billion cu. ft. 

 Million ac. ft. 

 Million ac. ft. 

 Million in. 

 Million tons 



0.6 



99.6 



95.4 



134.1 



1.148.4 



0.6 



100.2 



92.0 



131.1 



1,142.4 



5.5 



176.2 



168.7 



71.4 



82.9 



5.6 



176.2 



166.4 



71.8 



95.2 



0.0 

 17.6 



6.6 

 164.1 

 257.1 



0.0 

 19.4 



5.5 

 165.0 

 266.5 



14.4 

 486.5 

 435.6 

 539.3 

 169.8 



14.8 

 484.3 

 463.3 

 510.2 



20.2 



20.5 



780.1 



706.3 



908.9 



1,658.3 



20.5 



780.1 



727.1 



878.1 



1,524.3 



ment was revealed for the Eastern Forest 

 ecog-roup where, in 1970, nearly 170 million 

 tons was deposited in stream channels; under 

 Alternative 19 this would be reduced to less 

 than one-eighth of that amount. This improve- 

 ment results primarily from the elimination of 

 exploitative grazing (72 million acres of the 

 Eastern Forest ecogroup were under exploita- 

 tive grazing in 1970). 



Comparing the results of Alternative 20 to 

 the Resource Situation — 1970 helps to explain 

 some of the changes that occurred under Al- 

 ternative 19. Under Alternative 20 a significant 

 improvement occurs in quality water yield, 

 storm runoff, and sediment over the Resource 

 Situation — 1970 (table 11). These changes are 

 greater than the improvements under Alterna- 

 tive 19 (table 20). Alternative 20 is superior 

 in these aspects because less acreage would be 

 grazed. A large acreage would move to Strategy 

 A — no livestock grazing — with the improve- 

 ment as indicated in the earlier discussion of 

 Strategy A as a single strategy alternative. 



Soil quality, soil stability, air quality, and 

 beauty were not very sensitive at the national 

 level when tested under Alternative 19. Their 

 response to Alternative 19 and to other selected 

 alternatives is presented in table 21. Alterna- 

 tive 19 suggests some improvement in three of 

 these parameters and no improvement in the 

 fourth, air quality. These measurements are 

 most meaningful when evaluating individual 

 ecosystems or resource units. The important 

 consideration, however, is that under the con- 

 ditions of Alternative 19 (which meets the 

 grazing demands for year 2000), the 50 per- 

 cent increase in animal unit months could 

 be achieved without deterioration of environ- 

 mental quality. Alternatives 1, 2, and 20, all 

 of which are unconstrained, also show a similar 

 response. 



Review of the qualitative indexes for rare 

 species, non-game birds, carnivores and raptors, 

 and hunting and other recreation indicated no 

 change to slight improvement of these values 

 under Alternative 19 as compared to the Re- 



source Situation — 1970 (table 22). Alternatives 

 1 and 20 showed a slightly better response for 

 rare species, non-game birds, and carnivores- 

 raptors than did Alternative 19. The Alterna- 

 tive 1 and 20 improvements were closely related 

 to the number of acres requiring management 

 at levels of Strategies D or E. Alternative 19 

 showed no real change from the Resource Sit- 



Table 21. — Indexes of soil stability, soil quality, 

 air quality, and beauty in 1970, and for selec- 

 tive alternatives. 



(Qualitative index) 

 [Qualitative outputs were measured on a scale of 1 to 

 5: 5-Excellent, 4^Good, 3-Fair, 2-Poor, and 1-Bad.] 



Item 



Soil 

 stability 



Soil 

 quality 



Air 



quality 



Beauty 



Resource Situa- 

 tion— 1970 



Alternatives : 

 19 



3.3 



3.4 

 3.5 

 3.5 

 3.4 



3.7 



3.8 

 3.9 

 3.9 

 3.9 



3.5 



3.5 

 3.5 

 3.5 

 3.5 



3.2 

 3.3 



1 



3.3 



2 



3.3 



20 



3.3 







Table 22. — Indexes of rare species, non-game 



birds, carnivores and raptors, hunting, and 



other recreation in 1970, and for selected 



alternatives 



(Qualitative index) 



[Qualitative outputs were measured on a scale of 1 to 



5: 5-Excellent, 4-Good, 3-Fair, 2-Poor, and 1-Bad.] 



Item 



Rare 



species 



Non- 

 game 

 birds 



Carni- 

 vores 

 and 

 raptors 



Hunt- 

 ing 



Other 

 recrea- 

 tion 



Resource Situa- 

 tion— 1970 — _ 



Alternatives : 

 19 



3.4 



3.4 

 3.5 

 3.4 

 3.5 



3.4 



3.5 

 3.6 

 3.5 

 3.6 



3.5 



3.5 

 3.7 

 3.6 

 3.7 



3.2 



3.2 

 3.5 

 3.3 

 3.4 



2.9 

 3.0 



1 



2.9 



2 



2.9 



20 



3.0 







90 



