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EIS Arapahoe & Roosevelt National Forest, Pawnee National Grassland
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EIS Arapahoe & Roosevelt National Forest, Pawnee National Grassland
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Last modified
1/26/2010 4:38:28 PM
Creation date
6/15/2009 11:45:54 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8461.250
Description
Water Issues
State
CO
Basin
South Platte
Water Division
1
Author
USDA, Forest Service, Rocky Mountain Region
Title
EIS Arapahoe & Roosevelt National Forest, Pawnee National Grassland
Water Supply Pro - Doc Type
EIS
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Chapter 3- Affected Environment and Consequences <br />Aetween alternatives occur with water yieid increases, and number of watersheds entered. <br />These differences allow for ranking of these alternatives. <br />Alternative E produces more water than Alternatives A or G. Alternative E is at a higher risk of <br />adversely affecting water for this management practice. Alternatives A and E enter the same <br />number of watersheds for timber harvest, and those entered under Altemative A have higher <br />inherent soil erosional indices (Table 3-11) than Alternative E, thus Alternative A is at higher risk <br />of impacting the water resource than Alternative E. Although Alternative G shows higher <br />erosional index than Alternative E, the number of watersheds entered is nine more, thus <br />potential impacts are spread out more. Acres harvested by watershed row in Table 3-11 show <br />that more acres per watershed are harvested with Alternative E than Alternative G, thus Alterna- <br />tive E has a higher risk of adverse effects to water. <br />Table 3-11. Summary of Watershed Disturbance per Year at Full Implementation Level <br />x?"? • -ActiyityF? A C : De?.,:? ? `E ' F <br />Timber <br />Harvest Volume-MMBF (including <br />Aspen) 25 10.4 16.8 18.1 28 4.9 24.6 <br />Acres harvested (Including Aspen) 2553 1156 1719 1783 2850 520 2497 <br />Erosional Index (EI) (Timber) 51,932.1 25,063.4 37,389.8 37,281.4 56,270.9 10,295.2 50,778.9 <br />Water yield Increase (ac-ft) 1,113 450 727 834 1,255 239 1,110 <br />Roads <br />Roads in Miles (Timber & Recre- <br />ation) 37.4 19.6 26.4 27.1 40.4 6.3 36.4 <br />Roads in Acres (Timber & Recre- <br />ation) 80.5 39.6 55.1 56.7 87.2 14.3 78.0 <br />Erosional Index (EI) Roads 1,454.0 667.8 946.0 978.0 1,588.0 271.7 1,404.0 <br />Improvements <br />Soil & Water Improvement (ac) 200 72 146 150 190 140 176 <br />Totals <br />Total Acres Disturbed 2635.5 1195.6 1774.1 1839.2 2937.2 534.3 2533.4 <br />Total EI (Harvest & Roads) 53,386.1 25,731.2 35,335.8 38,259.4 57,858.9 10,566.9 52,182.9 <br />Watersheds Entered 78 60 73 74 78 44 85 <br />Acres per Watershed Harvested <br />(average) 34 20 24 25 38 12 30 <br />Source: Routt FORPLAN Model <br />Altematives B, C, D and F vary in MMBF produced, acres disturbed by harvest, roads <br />constructed and reconstructed, watersheds entered and water yield increases. These variations <br />are easily seen and rating potential impacts of implementation of these altematives is more <br />evident. <br />There would be no direct effect of timber harvesting on riparian areas since none of the alterna- <br />tives harvest timber from riparian areas. <br />Harvest activities outside the riparian area could potentially impact stream and riparian areas <br />through increased water yield and sedimentation. This is especially true if the harvest activities <br />are adjacent to the riparian area, although the effect could be realized downstream. This will be <br />-n mimal due to the riparian protection provided by the above mentioned mitigation measures. <br />3-48 Routt National Forest - ElS (WatedRiparlan/Wetlands) <br />? <br />? <br />? <br />? <br />? <br />? <br />? <br />? <br />? <br />? <br />? <br />` <br />? <br />? <br />` <br />? <br />? <br />? <br />? <br />? <br />? <br />? <br />? <br />? <br />? <br />? <br />? <br />? <br />? <br />? <br />? <br />? <br />y <br />? <br />? <br />? <br />? <br />? <br />? <br />? <br />? <br />? <br />?
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