FLOOD10358 ‎(2)‎

• Document ID: 124
• County: Alamosa
• County: Rio Grande
• Community: Rio Grande and Alamosa CountiesRio Grande and Alam
• Stream Name: Rio Grande RiverRio Grande River
• Basin: Rio Grande
• Sub-Basin: Upper Rio Grande
• Water Division: 3
• Title: Rio Grande Headwaters Restoration Project
• Date: 10/1/2001
• Prepared For: San Luis Valley Water Conservancy District, RGHRP Technical Advisory CommitteeSa
• Prepared By: Montgomery Watson Harza
• Watershed Pro - Doc Type: Project Report

ES-3
............ES-6
..........ES-13
..........ES-16
..........ES-17
..........ES-18
...........ES-19
...ES-22
..ES-24

I

.

Description of RGHRP Reaches
Sub-Reach Definition .......................................
Diversion Structure Capacity and Overall Rating.
Decision Criteria and Technical Evaluation Measures ..........
T AC Relative Importance of Sub-Reach Evaluation Criteria.
Weighted Sub-Reach Scores ...............................................
High Priority Structural Projects....................................................................
Affected Sub-Reaches and Prioritization of High Priority Structural Projects
Planning Level Cost Estimates for High Priority Structural Projects.

List of Tables

Table ES-1.
Table ES-2.
Table ES-3.
Table ES-4.
Table ES-5.
Table ES-6.
Table ES-7.
Table ES-8.
Table ES-9.

2-3
2-4
2-6
2-11
2-16
2-18
2-21
2-29
2-30

Summary of San Luis Valley Temperature Data
Summary of San Luis Valley Precipitation Data.
Municipal and County Populations ....................
Information Available from CDOT for Bridges Along the Rio Grande
Rio Grande Streamflow Gaging Station Period-of-Records ............................................
Effects of Compact Deliveries on Average Flows at the Del Norte and Alamosa Gages.
Significant Historical Flood Discharges on Rio Grand
RGHRP River Reaches...........
Summary of Reach Conditions

Table 2-1.
Table 2-2.
Table 2-3.
Table 2-4.
Table 2-5.
Table 2-6.
Table 2-7.
Table 2-8.
Table 2-9.

3-2
3-5
3-23
3-24
3-24

3-30
3-35
3-36
3-52
3-60
3-65
3-66
3-68
3-71
3-72
3-74
3-76

4-2
4-4

5-1
5-3

Sub-Reach Definition
Location of Cross-Sections
Summary of Geomorphology Sub-Reach Analysis..........
Summary of Geomorphology Analysis at Specific Points
Historical Sinuosity and Channel Length Change................................
Average Channel Stability, Bank Erosion, and Meander Distance Values

for Sub-Reaches...................... ................................................................
Vegetation Changes from 1941 to 1963...................................................
Sub-Reach Changes from 1968 to 1998..................................................
Estimated, Decreed and Historical Capacities of Irrigation Diversions............
Summary of Current Flooplain Ordinances in Rio Grande Corridor Communities.
Channel Capacity and Compact Flows Evaluation Measures
Floodplain Evaluation Measures ...............
Riparian Habitat Evaluation Measures ......
Normalization Factors for Riparian Scores
Diversion Evaluation Measures .......
TAC Relative Importance of Criteria
Weighted Sub-Reach Scores

Table 3-1.
Table 3-2.
Table 3-3.
Table 3-4.
Table 3-5.
Table 3-6.

Table 3-7.
Table 3-8.
Table 3-9.
Table 3-10.
Table 3-11.
Table 3-12.
Table 3-13.
Table 3-14.
Table 3-15.
Table 3-16.
Table 3-17.

Potential Structural and Non-Structural Alternatives by Reach from Brainstorming Session
High Priority Structural Projects.

Affected Sub-Reaches and Prioritization of High Priority Structural Projects
Planning Level Cost Estimates for High Priority Structural Projects....

Table 4-1.
Table 4-2.

Table 5-1.
Table 5-2.

.

5-1
5-3
5-4
5-5

6-1

7-

.
Section 5 - Implementation Program
5.1 Prioritized Enhancement Projects.........
5.2 Cost Estimates .......... ....................... .......
5.3 Implementation Schedule ......................
5.4 Potential Implementation Partners and Funding Sources
Section 6 - References
References ................................
Section 7 - Glossary
Glossary ....................................
Exhibits
Exhibit 1 - Political Jurisdictions
Exhibit 2 - Surface Geology
Exhibit 3 - Land Use

and Historic Channels

Areas,

4 - Satellite Imagery
5 - Field Survey Sites
6 - Channel Stability
7 - Subreach Designation
8 - Subreach Rating Criteria and Overall River Condition
9 - Locations of High Priority Structural Measures
10 - Floodplains, Canals, Cross Sections, Riparian
(1 through 11)

Exhibi
Exhibi
Exhibi
Exhibi
Exhibi
Exhibi
Exhibi