FLOOD10167

• Designation Number: 299
• County: Costilla
• Community: Unincorporated Costilla County
• Basin: Rio Grande
• Title: Floodplain Information Report - for the Rio Grande, Trinchera Creek, Culebra Creek, Colstilla Creek, and Selected Tributaries in Costilla County
• Date: 3/1/1989
• Designation Date: 11/1/1989
• Floodplain - Doc Type: Floodplain Report/Masterplan

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Preface

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5.0

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TABLE OF CONTENTS

Paqe

Introduct ion ................................. 1
1. 1 Pur pose ,.."...,....................... 1
1. 2 Authorization. .. . . . . . . .. .. . .. .. .. . . .. . . 1
1,3 Acknowledgments ........................ 2
1.4 Related Flood Studies.. ........... ..... 2

Study
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8

Area ................................... 4
Location ..,....,....................... 4
Human Settlement ....................... 7
Study Reaches .......................... 7
Ri 0 Grande Bas in ......................, 7
Trinchera Creek Basin... .......... ..... 12
Culebra Creek Basin... .... ....... ...... 13
Costilla Creek Basin.. ........... ...... 13
Summary of Drainage Areas.. ...... ... ... 14

Hydrologic Analysis ........ .................. 17
3,1 Flood Characteristics. ..., .....,.. ..... 17
3.2 Historical Review.... ...... ...... ...... 17
3.3 Stream Gage Data ......,............,... 20
3,4 Reservoirs. . . . . . . . . . , . . . . . . . . . , . . . . . . .. 23
3.5 Irrigation Ditches .....................23
3.6 Peak Flows ............................. 26

Hydraulic Analysis ........................... 30
4,1 Base Mapping... ,............'.... ...... 30
4.2 Flood Depths ........................... 30
4.3 Review in the Field .. ................., 31
4.4 ~.looded Areas .....,.................... 31

Interpretation and Use of Report ............. 34
5,1 Flood DiSCharges ....................... 34
5.2 Flooded Area Maps.... ........... .... ... 34
5.3 Structural Measures.. ............ ... ... 35
5.4 Measures that Reduce Vulnerability..... 35
5.5 Measures that Minimize Impacts ......... 36

Bibliography ................................. 38