My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
FLOOD08628
CWCB
>
Floodplain Documents
>
Backfile
>
8001-9000
>
FLOOD08628
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
1/25/2010 7:15:07 PM
Creation date
10/5/2006 3:46:10 AM
Metadata
Fields
Template:
Floodplain Documents
County
Costilla
Community
San Luis
Stream Name
San Luis area drainageway
Basin
Rio Grande
Title
Master Drainage Study Town of San Luis
Date
12/1/1988
Prepared For
San Luis
Prepared By
WRC Engineering, Inc.
Floodplain - Doc Type
Floodplain Report/Masterplan
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
43
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 />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />, I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />structure at Hi ghway 159 wi 11 not requi re the capacity of the <br />bridges upstream and downstream (approximately 300 cfs). Therefore, <br />the need for a larger single or double span bridge was eliminated. <br />The alternatives considered were single or multiple culvert <br />installations. Due to the limited amount of depth available between <br />the crown of the hi9hway and the channel bottom, selections were <br />further limited to multiple culvert installation, specifically a <br />double 6' x 3' reinforced concrete box culvert and double 57" x 38" <br />corrugated steel pipe and with concrete headwalls. <br /> <br />4. Recommendations <br /> <br />WRC recommends that a double 6 I X 3' rei nforced concrete box cul vert <br />with headwall and wingwalls be installed in the Rito Seco beneath <br />Highway 159. In addition, the downstream channel from Highway 159 <br />to Highway 142, including the portion under the Highway 142 bridge <br />will need to be graded to provide positive slope and reduce the <br />backwater downstream from Highway. 159. The concrete structure will <br />provide approximately 2.0 feet of freeboard during the 100 year <br />storm as opposed to approximately 0.5' for the corrugated steel <br />structure. The concrete structure would provide the business area <br />with additional flood and drainage protection. <br /> <br />See Sheet 2 of 4 of Drawings. <br /> <br />-18- <br />
The URL can be used to link to this page
Your browser does not support the video tag.