Animas- La Plata Environmental Impact Statement

Ridges Basin Contents - 400 cfs Supply Scenario
2 -Month Pumping Preference
Rol "'Ifflar NO
KIM
old
Switched to Yea
r Round in 1977
Resume 2_month pumping in 1983
>
4
0
Switch to Year Round 1" 2001
Resume 2-month pumping In 200
-Year Round Pumping -May -June Pumping Only •••••• Inactive Pool May -June Pumping then Year -Round at 60,000 AF
Analysis: 400 cfs water tdiversion limit. with 2 -month pumping preference. When the reservoir Formatted: Font: Bold
level drops to near 60,000 acre -feet, allow year -round pumping until the reservoir significantly recovers
(above 100,000 acre -feet)
Observations' Formatted: Font: Bold
• With a 400 cfs diversion limit. the content is below the dead pool level only 2 months
(winter months) in the analysis period with the 2 -month pumping preference then year -round
when level drops to near 60,000 acre -feet. Full project demands can be met.
• With a 400 cfs •tdiversion limit, a 2 -month pumping cycle can occur 70 percent of the
time. 30 percent of analysis years would require year -round pumping.
• Reservoir takes longer to recover to full than 450 cfs scenario after 1.989 because no year -round
umoina and lower total diversion rate.