My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
FLOOD00822
CWCB
>
Floodplain Documents
>
Backfile
>
1-1000
>
FLOOD00822
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
11/23/2009 10:51:19 AM
Creation date
10/4/2006 9:30:35 PM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
34
County
La Plata
Community
Durango
Stream Name
Animas River and Tributaries
Title
Floodplain Information Report - Animas River and Tributaries, Durango, Colorado
Date
6/1/1974
Designation Date
12/1/1974
Floodplain - Doc Type
Floodplain Report/Masterplan
Supplemental fields
Water Division
7
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
51
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 />~s a rijtio of t~e Standard Project Flood. T~e peak flows thus developed <br />are shown In Table 5. Stage ~ydrographs of the Intermediate Regional <br />Flood at various locations In the study area are shown on Plates 2-5. <br /> <br />FUTURE FLOODS <br /> <br />STANOARO PROJECT FlOOO <br /> <br />Although 1100d producing storms 01 the same magnitudes as those that <br />have occurred In the past could recur In the future, discussIon of future <br />fl<XXIs in this report Is limited to those that have been designated as the <br />Intermedl~te Rogional and Standard Project FloodS. The Standard Project <br />Flood would be larger and would occur less frequently than the Intermediate <br />Regional Flood. A Standard Project Flood would be a rare event, but could <br />reasonably be expected to occur. The magnitude of these fl<XXIs was based <br />on hydrologIc computations, whiCh Include analysis 01 avaIlable records of <br />p~st floods, and consideration of pertInent meteorologic and physiographic <br />conditions. AS prevIously Indicated, general rain flOOdS or clOUdbursts <br />would create the more severe flood condItions In the study area. <br /> <br />The Standard Project FlOOd Is one that may be expected 1rom the most <br />severe combination 01 hydrometeorologlcal conditions reasonably charac~ <br />terlstlc of the geographIcal region. Peak flows for the Standard Project <br />FlOOd were derived from general rainstorm data for the Animas River and <br />LIghtner and Junction Creeks, and from cloudburst storm data for Dry Gulch <br />Creek, taking Into ~coount basin runoff characteristics, ground saturation <br />conditions, and losses from surface pondage and other factors. Peak flowS <br />for the Standard ~roJect Flood are also shown In Table 5. <br /> <br />TABLE 5 <br />PEAK FLOWS FOR INTE~~DI^TE REGIONAL <br />ANO <br />STANDARD PROJECT FLooOS <br /> <br />During floods, debris collecting against obstructions causes greater <br />water depths (backwater effect) upstream. Since the occurrence and amount <br />ot debris are Indeterminate tactors, only the physical characterIstics of <br />obstruetlons were considered in derIving theIr effect for the maps and <br />other Illustrations showing the Intermodlate Regional and Standard ~roject <br />Floods. These maps ar.d Illustrations reflect D::mslderation of vcge1"atlon <br />normally existing in floodways. <br /> <br />Location <br /> <br />IntermedIate <br />Ratllonal Flood <br /><:.1.s. <br /> <br />Standard <br />Prolect Flood <br />c.f.s. <br /> <br />A.'lIMASRIVER <br />At SM Juan i'lational Forest Boundary <br />At the "Animas River at Durango Gage" <br />AtlaPostaRoad <br /> <br />27,300 <br />28,500 <br />29,400 <br /> <br />40,300 <br />42,000 <br />43,400 <br /> <br />INTERMEOIATE REGIONAL FLOOD <br /> <br />LIGHTNER CREEK <br /> <br />The Intermedlata Regional Flood Is one that could occur about once In <br />100 years on the average although It may occur, and has a I percent proba- <br />bility of occurring, in any given year. Peak flows for the Intermediate <br />RegIonal FlOOd on the Animas River and LIghtner Creek were developed by <br />statistIcal ..n;)lyses of ;)vallllblc streamflow records. Palik flo"5 for tile <br />Intermediate Regional Flood on Junction and Ory GulCh Creeks were computed <br /> <br />At WIldcat Creek <br />At Animas River <br /> <br />4,100 <br />1,200 <br /> <br />8,900 <br />9.100 <br /> <br />JUNCTION CREEK <br /> <br />At San Juan National <br />At Animas Rlver <br /> <br />Forest Boundary 3,600 <br />3,900 <br /> <br />7,900 <br />8,600 <br /> <br />DRY GIJLCH CREEK <br /> <br />At Junction Creek <br /> <br />1,400 <br /> <br />2,300 <br /> <br />" <br /> <br />" <br /> <br />. <br />
The URL can be used to link to this page
Your browser does not support the video tag.