My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
WSP12907
CWCB
>
Water Supply Protection
>
DayForward
>
1-1000
>
WSP12907
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
1/26/2010 4:34:11 PM
Creation date
3/24/2008 3:31:00 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8441.700
Description
Colorado Big Thompson
State
CO
Basin
South Platte
Date
1/1/1997
Author
USDOI/BOR
Title
Annual Operting Plans Colorado Big Thompson Project & Western Division Systems Power Operations, Water Year 1997 Summary of Actual Operations
Water Supply Pro - Doc Type
Annual Report
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
52
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
Show annotations
View images
View plain text
<br />acre-feet or 99 percent of average. Precipitation continued to be well above average for July at 190 <br />percent. <br /> <br />Bypass releases above the minimum required release to Willow Creek were 6,637 acre-feet for <br />May, 9,478 acre-feet for June, 1,201 acre-feet for July, 1,342 acre-feet for August, and 1,100 acre- <br />feet for September. August precipitation was well above average at 141 percent, and inflow was <br />above average at 130 percent of the 1966-1995 average. <br /> <br />September precipitation was well below average at 82 percent, however inflow continued to be <br />high at 31,865 acre-feet, or 163 percent of average. By the end of the water year, natural inflow <br />was estimated to be 156 percent of average, which amounted to 91,700 acre-feet. <br /> <br />During water year 1997, 85,500 acre-feet of controlled releases into the river were made in excess <br />of irrigation demand and minimum flow requirements. Lake Granby was close to or at maximum <br />capacity for most of the year, due to the high runoff. Excess volume from Willow Creek Reservoir <br />was bypassed into the river, as the storage at Lake Granby reached maximum level. These <br />optimizing operations at the Willow Creek Project resulted in significant savings in pump energy <br />costs. However, during the month of July 1997, as storage became available, 899 acre-feet of water <br />was pumped to Lake Granby. Also an additional 2,914 acre-feet was pumped to Lake Granby <br />during October and November 1996, as storage became available in Lake Granby, and storage <br />space was needed for wintertime operations in Willow Creek Reservoir. Another 100 acre-feet <br />were pumped into Granby Reservoir during September of 1997. <br /> <br />During water year 1997, a total of 3,946 acre-feet were pumped into Lake Granby, which was only <br />13 percent of historical average. By the end of September 1997, the volume stored at Willow <br />Creek Reservoir had reached 10,040 acre-feet, 114 percent of the thirty-year average. <br /> <br />Granbv Reservoir <br /> <br />Completed in 1950, the Granby Reservoir on the Upper Colorado River collects and stores most of <br />the Project water supply for the Project. The reservoir stores the flow of the Colorado River as well <br />as water pumped from Willow Creek Reservoir. The reservoir has a total storage capacity of <br />539,800 acre-feet. The reservoir's spillway is located on the left abutment. Two radial gates <br />control the flow out of the structure. The maximum release capacity of these gates is 11,500 fe Is. <br />The Granby Pumping Plant has three units with a combined installed capacity of 600 ft3/s. <br /> <br />Reservoir carryover storage into water year 1997 was 499,610 acre-feet, which were 85,940 acre- <br />feet above the 30-year average of 413,670 acre-feet. <br /> <br />October-January precipitation was estimated at 149 percent of average, while the inflow for the <br />same period was 168 percent of average. The precipitation for January was 2.56 inches, 203 <br />percent of average, and the inflow was 5,400 acre-feet, or 150 percent of average. <br /> <br />During the months of October 1996 through January 1997, Granby maintained the typical 20 fe /s <br />minimum flow required for fish release. <br /> <br />11 <br />
The URL can be used to link to this page
Your browser does not support the video tag.