My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
WSP09066
CWCB
>
Water Supply Protection
>
Backfile
>
9001-10000
>
WSP09066
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
1/26/2010 2:50:56 PM
Creation date
10/12/2006 3:26:30 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
5000.350
Description
Flood Protection Section - Flood Activities - 1985
State
CO
Basin
Statewide
Date
5/1/1985
Author
USDA - DOC
Title
Water Supply Outlook for Western United States - 05-01-85
Water Supply Pro - Doc Type
Report/Study
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
16
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 />002193 <br />COLUMBIA BASIN -- Continued <br /> <br />Host basin reservoirs will fill, but with continued <br />dry weather and high irrigation demand, it may be <br />difficult to fill the Yakima and Boise re6er~oir systems. <br /> <br />GREAT BASIN <br /> <br />Below normal April precipitation in the Great Basin <br />CODlhined with very nigh flows during Apri I, resulted in <br />lower runoff volumes for the Hay-July period. The dry <br />warm April weather lowered the threat of flooding and <br />minimized the danger of slides. <br /> <br />April precipitation throughout the basin was generally <br />20-45 percent of normal hut increased to 120-170 percent <br />of normal in southern and eastern Utah. <br /> <br />Seasonal precipitation since October 1 is below <br />normal, 50-80 percent, over portions of north-central <br />Utah hut increases substantially to more than 150 pe~cent <br />over the southeast po~tion of the state. <br /> <br />The Hay I snow mea6u~ements ~eflect the unusually warm <br />weather in April which resulted i.n a significant decline <br />in the mountain snowpack. Host basin ave~agea declined <br />10-40 percent f~om the April 1 readings. <br /> <br />G~ea t Bas i n was <br />2-3 times normal <br />Many of these <br />season. Since <br />Baa in has been <br /> <br />Observed streamflo.... throughout the <br />much above normal. Host streams had <br />flows reflecting the early snowmelt. <br />streams have al~eady peaked for this <br />Octobe~ 1 runoff ove~ most of the G~eat <br />160-200 pe~cent of normal. <br /> <br />The elevation of the Great Salt Lake on Hay ....as <br />4209.90 feet, an increase of 0.35 feet during April. <br />The Great Salt Lake is l.BO feet higher than last years <br />May 1 reading and is at its highest level since 1877. <br />The lake should continue to ~ise slowly, peaking within <br />the next few weeks at a level nea~ o~ helow 4210.20 <br />feet. The peak last year was 4209.25 feet. <br /> <br />Utah Lake on may 1st was 3.28 feet above <br />compromise, a rise of 0.34 feet during April. Utah Lake <br />is very near its peak elevation, within several <br />inches, and should start receding within the next several <br />weeks. <br /> <br />Reservoir storage th~oughout Utah remains well above <br />average. April month-end contents of 24 reservoirs was <br />ahout 340,000 acre-feet more than last year at this time. <br /> <br />The flood potential continues to diminish with dry <br />warm weather helping to decrease the snowpack and drying <br />the soils. Many low elevation streams throughout the <br />state have already peaked. High flows from snowmelt <br />runoff are still likely but streams are expected to <br />remain within stream channels. The potential for land <br />slides and earth failures has greatly diminished. <br /> <br />COLORADO BASIN <br /> <br />The water supply outlook for the Upper Colorado Basin <br />is above normal. Forecast flows increased 5 to 15 <br />percent over those issued April 1. Runoff volumes are <br />forecast at 130-170 percent of normal for the May-July <br />period on the San Juan. Dolores, and Gunnison watersheds <br />as well as the Colorado lIlainstem from Cameo to Lake <br />Powell. The Green River Basin and headwaters of the <br />Colorado changed only slightly. <br /> <br />April precipitation ranged from less than 50 percent <br />of normal on the Upper Green River in Wyoming to about <br />200 percent of average over much of the Colorado mainstem <br />and San Juan Basin. SOllie areas along the Cont lnental <br />Divide were near normal. Seasonal precipitation was <br />quite varied over the Upper Colorado Basin. Portions of <br />the Upper Green River in Wyoming received less than 50 <br />percent with a vast majodty of the Colorado drainage 110 <br />to 140 percent with SOTOle stations exceedi':lg 150 percent <br />in the San Juan and Dolores watersheds. <br /> <br />The Hay mountain snow-pack as compared to April 1 <br />declined to ahout 65 percent of average in the Upper <br />Green, changed only slightly over Colorado mainstem, <br />hut increased significantly in the San Juan Basin. <br /> <br />Runoff during April was generally at record <br />proportions for the month. Warm weather resulted in an <br />early snowmelt regillle with many drainages having flows <br />more than 200 percent of normal. The Apdl infloW' to <br />Navajo Reservoir was a record alllount at 340,000 <br />acre-feet, while the inflow to Lake Powell was 2.55 <br />million acre-feet, second highest on record. <br /> <br />Reservoir storage remains high. The COlllbined storage <br />of ten major reservoirs above Lake Powell is 6.1 million <br />acre-feet, about 330,000 acre-feet mo~e than last year at <br />this time. Storage in the four Salt River reservoirs in <br />Arizona is 1.7 million acre-feet, almost toO percent of <br />capacity. Current storage in Lake Powell is 22.5 million <br />acre-feet, 300,000 acre-feet more than last year. <br /> <br />Some flooding in loW' lying and flood prone areas may <br />occur on the San Juan, Dolores, and Gunnison drainages as <br />well as the Colorado mainstem below the confluence with <br />the Gunnison River. <br /> <br />RIO GRANDE BASIN <br /> <br />Above normal precipitation was reported over the <br />entire Rio Grande Basin during the month of April, <br />increasing the total seasonal streamflow forecasts at <br />some forecast points by 10 to 20 percent from April 1 <br />predictions. Forecast total9 in the Golorado portion of <br />the basin are 107 to 160 percent of average, and in New <br />Mexico 110 to 215 percent of average. <br /> <br />Ouring the last week of Apri 1, signi ficant <br />precipitation was ohserved at many basin locations <br />pushing monthly totals above 200 percent of normal <br />throughout the basin. Overall, it was one of the wettest <br />Aprils in the last 40 yea~s in New Mexico. <br /> <br />Ahove normal snowfall was reported during the month of <br />April in the higher elevation areas, particularly the San <br />Juan Mount a ins 0 f sou thern Go lorado. The baa i n flOowpack <br />in Colorado is now 153 percent of average which is ahout <br />20 percent higher than last year at this time. In New <br />Mexico, above normal cemperatures around the middle of <br />the month resulted in melting of a large percentage of <br />the snowpack. this produced very good runoff and much <br />above normal stream flows for the month. <br /> <br />Reservoir storage increased at most of the hasin lakes <br />during the !Donth, and total storage is well above <br />average. At Elephant Butte and Caballo Reservoirs, water <br />in storage now totals about 1.9 million acre-feet which <br />is the highest amount since the record high of 2.3 <br />million acre-feet in 1942. <br /> <br />ARKANSAS BASIN <br /> <br />The Arkansas Ri...er <br />indicates near normal <br />volumes range from 105 <br />(1961-1980) average. <br /> <br />Basin <br />runoff. <br />to 115 <br /> <br />water supply outlook <br />Predicted streamflow <br />percent of the 20-year <br /> <br />Several moderate storms during April produced above <br />normal precipitation, with the majority of the basin <br />receiving 150 percent of normal. Seasonal totals <br />(October through April) range from near normal in the <br />northern valleys to near twice normal furcher south and <br />east along the Sangre De Cristo Mountains and the <br />southeastern quarter of Colorado. <br /> <br />Hay I snowpack increased slightly from a month ago at <br />a few of the higher elevation snow courses. Snowpack at <br />the low and mlddle elevation snow courses decreased <br />dramatically due to above no~mal temperatures during the <br />month of Apri 1. North and west of Sal ida in the Sawatch <br />mountains, May 1 highs were noted at Porphyry Creek and <br />Twin Lakes tunnel with averages of 110 to 120 percent <br />of normal. At lower elevations, the snowpack. is <br />vlrtually non-existent due to ahove normal temperatures <br />in Apri 1. <br /> <br />2 <br />
The URL can be used to link to this page
Your browser does not support the video tag.