WMOD00593

• Contract/Permit #: 14-06-D-7052
• Title: Ecological Impacts of Snowpack Augmentation in the San Juan Mountains, Colorado
• Date: 3/1/1976
• State: CO
• Weather Modification - Doc Type: Report

Table 2a. Seasonal variations in coefficient of variation (V) (1914-63)
Station Elevation Spring Summer Fall Winter Annual
(meters) (feet)
1) Ames 2653 8,701 39.3 32.0 55.4 27.8 20.8
2) Cascade* 2699 8,853 54.8 43.7 62.3 34.0 28.5
3) Durango 1997 6,550 65.6 37.1 60.2 39.1 26.1
4) Fort Lewis 2316 7,595 63.0 39.5 57.3 35.1 27.3
5) Ignacio 1959 6,424 68.0 47.2 56.5 35.5 27.9
6) Rico 2696 8,842 44.5 37.2 59.1 23.2 22.5
7) Silverton 2842 9,322 35.5 36.0 51.7 34.4 22.3
8) Telluride 2670 8,756 43.8 42.7 56.2 35.9 27.2
9) Trout Lake* 2951 9,680 37.8 45.0 57.7 30.1 23.6
*1914-57
Table 2b. Elevation
Stations (meters) (feet) Increasing Coefficient of Variation
11<0.< La'" 2951 9,680 Winter?Spring~urnrner~Fall
I
Silverton 2842 9,322 Winter?Spring~ummer~Fall
r'M' 2699 8,853 Winter~urnmer?Spring~all
II Rico 2696 8,842 Winter?Summer?Spring~Fall
Telluride 2670 8,756 Winter?Summer?Spring~Fall
Ames 2653 8,701 Winter~Summer~Spring~Fall
r" Low1, 2316 7,595 Winter?Summer?Fall~Spring
III Durango 1997 6,550 (Surnmer~Winter)?Fall?Spring
Ignacio 1959 6,424 Winter~Summer~Fall~pring

Table 3. Changes in Coefficients of Variation (1914-40) to (1941-68)
V:Period I V: Period 'II Difference I to tI
Winter
Ames 30.14 25.86 - 4.28
Durango 45.01 31. 46 -13.55
Ft. Lewis 40.73 27.78 -12.95
Ignacio 36.43 33.13 - 3.30
Rico 25.05 21. 23 - 3.82
Silverton 35.22 30.83 - 4.39
Telluride 47.27 27.66 -14.61
Summer
Ames 35.33 28.32 - 7.01
Durango 33.28 41.21 + 7.93
Ft. Lewis 40.76 37.37 - 3.39
Ignacio 44.46 47.57 + 3.11
Rico 36.15 38.49 + 2.34
Silverton 42.33 27.34 -14.99
Telluride 47.92 37.77 -10.15

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