My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
9425
CWCB
>
UCREFRP
>
Public
>
9425
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
7/14/2009 5:02:35 PM
Creation date
5/22/2009 7:29:31 PM
Metadata
Fields
Template:
UCREFRP
UCREFRP Catalog Number
9425
Author
Bezzerides, N. and K. Bestgen.
Title
Status Review of Roundtail Chub
USFW Year
2002.
Copyright Material
NO
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
149
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 />1 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />urban developments associated with the water projects, have dramatically altered riverine <br />environments. <br />Table 2. Acts and legislation passed to develop and manage CRB water resources.* <br />Act Date Passed Effect ___ <br />Reclamation Act 1902 -Allowed federally subsidized urigat~on <br /> projects <br />Colorado River Compact 1922 -Apportioned Colorado River water to upper <br /> and lower basin states <br />Boulder Canyon Act 1928 -Official approval of the Colorado River <br /> Compact; authorization of Boulder Dam and <br /> All American Canal construction <br />Mexican Water Treaty 1944 -Guaranteed Mexico a minimum of ] .5 <br /> million acre-feet of Colorado River <br /> water annually <br />Upper Colorado River Compact 1948 -Divided Colorado River water between <br /> upper basin states <br />Colorado River Storage 1956 -Autharized four major storage units in the <br />Project Act Upper CRB <br />Colorado River Basin 1468 -Authorized the Central Arizona Project; <br />Project Act assigned priority to water users; and <br /> attended to other administrative details <br />Colorado River Basin 1974 -Assured maintenance of water quality <br />Salinity Control Act standards for water delivered to Mexico <br />*Source: Wegner 1989 (For details see also Carlson and Muth 1989). <br />Physical alterations-At least 140 dams and diversion structures are present on major <br />rivers and tributary streams throughout the Colorado River Basin (Bishop and Porcella <br />19$0). For major CRB rivers, Bishop and Porcella (19$0) estimated that 22% of <br />historically lotic reaches have been converted to reservoirs. In addition to loss of lotic <br />habitat through inundation, dams also modify sediment dynamics and downstream <br />hydrograph and temperature characteristics (Collier et al. 1996). <br />' Typically, dam-caused changes in the temperature, timing, and magnitude of streamflows <br />negatively affect distribution and survival of warm-water adapted native fishes. <br />Tailwaters of hypolimnial-release dams are often too cold far successful reproduction by <br />native warmwater fishes (Vanicek et al. 1970, Holden and Cast 1981, Marsh 1985, <br />Valdez and Ryel 1995, Bestgen and Crist 20p0). Cooler water temperatures also <br />influence growth and survival of embryos and young fish. Larvae grow more slowly, <br />' which increases their risk of predation and decreases accumulation of energetic reserves <br />' Final Report September 20(12 <br /> <br />
The URL can be used to link to this page
Your browser does not support the video tag.