<br />consideration of the uses and purposes identified in the 1970 Operating Criteria and the 1992
<br />Grand Canyon Protection Act, including ecological impacts to the Grand Canyon,
<br />
<br />T bl 3 Gl C
<br />
<br />D
<br />
<br />, fl
<br />
<br />a e en anyon am mtenm ow restnctlons
<br />Parameter (cms) (cfs) conditions
<br />Maximum flow (I) 708,0 25,000
<br />Minimum flow 141.6 5,000 nighttime
<br /> 226,6 8,000 7:00 am to
<br /> 7:00 pm
<br />Ramp rates
<br />ascending 113,3 4,000 per hour
<br />descending 42,5 1,500 per hour
<br />Daily fluctuations (2) 141.6/226,6 5,000/8,000
<br />
<br />Lake Mead
<br />
<br />For calendar year 1997 the surplus condition was the criterion governing the operation of Lake
<br />Mead in accordance with Article III(3)(b) of the Operating Criteria and Article II(B)(2) of the
<br />decree in Arizona v, California, On February 28, 1997, Reclamation informed the International
<br />Boundary and Water Commission (mWC) that there existed for calendar year 1997 surplus
<br />waters of the Colorado River within the provisions of Article I O(b) of the 1944 Mexican Water
<br />Treaty, On March 27, 1997, the mwc sent Reclamation a revised delivery schedule for Mexico
<br />with total deliveries of2,096 MCM (1.7 MAF),
<br />
<br />Based on the January 8, 1997 inflow forecast, flood control releases from Hoover Dam were
<br />initiated on January 17, 1997 at the 19,000 cfs level, as required by the Flood Control
<br />Regulations developed by the Army Corp of Engineers and the Bureau of Reclamation, These
<br />releases were continued through February, 1997, The March, 1997 flood control releases were
<br />below the 19,000 cfs level. Releases of713 MCM (.578 MAF) were released above downstream
<br />requirements in January, February, and March, 1997,
<br />
<br />(I) to be evaluated and potentially increased as necessary and in years when delivery to the
<br />Lower Basin exceeds 10,152 MCM (8,23 MAF)
<br />
<br />(2) Daily fluctuations limit is 141.6 cms (5,000 cfs) for months with release volumes less
<br />than 740 MCM (.600 MAF); 169.9 cms (6,000 cfs) for monthly release volumes of 740
<br />to 987 MCM (.600 to ,800 MAF); and 226.6 cms (8,000 cfs) for monthly volumes over
<br />990 MCM (.800 MAF)
<br />
<br />September 3, 1997
<br />
<br />12
<br />
<br />
<br />\1
<br />,
<br />~
<br />C
<br />
<br />"
<br />~
<br />
<br />':1
<br />
<br />;;,
<br />
<br />e'
<br />I:
<br />
<br />~~
<br />
<br />".<
<br />
<br />~!
<br />~ ~
<br />
<br />~~
<br />
<br />~~
<br />::..
<br />
|