FLOOD11632 ‎(2)‎

• County: Costilla
• Community: Costilla County
• Stream Name: Rito Seco
• Basin: Rio Grande
• Title: Approximate Floodplain - Rito Seco
• Date: 1/5/2007
• Prepared For: Costilla County
• Prepared By: HDR Engineering, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

Table of Contents
EXECUTIVE SUMMARY .......................................................................................................................... 3
INTRODUCTION ........................................................................................................................................ 3
SITE ............................................................................................................................................................... 3
I-II'DROLOGY ............................................................................................................................................. 5
HYDRAULICS ............................................................................................................................................. 6
CONCLUSION ............................................................................................................................................. 7
SITE PHOTOS ............................................................................................................................................. 9
APPENDIX ................................................................................................................................................. 12
k'igure 1- Location Map .............................................................................................................................. 4
Figure 2- 5urvey Points .............................................................................................................................. 5
Figure 3- Drainage Basin ........................................................................................................................... 6
Figure 4- Breach in Berm ........................................................................................................................... 9
Figure 5- Typical Cross Section - Main Channel of Rito Seco ................................................................. 9
Figure 6- Looldng East Across Floodplain and Overflow Channel ...................................................... 10
Figure 7- Bridge Located over the Rito SecoAppendix ......................................................................... 10
San Luis, Colorado - Rito Seco Approximate Floodplain