Laserfiche WebLink
<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 />