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. ... 4-5 ... 4-8 4-10 4-12 4-12 4-14 4-15 4-16 4-20 4-22 4-24 4-25 4-26 4-27 4-28 4-30 4-30 4-32 4-34 4-34 4-43 4-48 5-2 Del Norte Flood Protection Alternatives.................................. Schematic of a Grade Control Structure................................. Typical Reach C Channel Meander Reconnection ................. Plan View of Diversion Consolidation from Monte Vista Canal to Consolidated Slough Summed Cumulative Decree Rights of Proposed Consolidated Slough .................. Centennial and Empire Ditch Consolidation ............................................................ Existing Gunbarrel Bridge......... .............................................................................. Proposed Improvements at Gunbarrel Road ........................................................... Typical Reach D Geomorphic Modifications Downstream of San Luis Valley Canal Channel Restoration Opportunities in Reach E ............................................. Wasteway Structure Examples (Alsenbrey, et. AI., 1978).............................. North Farm Road Setback Levee Near Mesa Verde ..................................... Fourmile Road/CR 107 Setback Levees Near Alamosa ................................ Location of Excelsior, Costilla, Independent and Westside Consolidation ..... Summed Cumulative Decree Rights of Proposed Ditch Consolidation .......... Diversion Rights of Westside Ditch and Possible Pumping Stations.............. Conveyance Alternatives for Wests ide Diversion Low-Lift Pump Alternatives Plan View of Empire Extension Alternatives for the Westside Diversion Alamosa Levee System Improvements ................................... Drain Valve Options ................................................................ Sample Multipurpose Riparian Buffer Design .......................... Outline for Upper Rio Grande Watershed Management Study Implementing Organizations and Their Primary Responsibilities for Non-Structural Projects . 3-10 . Figure 4-1. Figure 4-2. Figure 4-3. Figure 4-4. Figure 4-5. Figure 4-6. Figure 4-7. Figure 4-8. Figure 4-9. Figure 4-10. Figure 4-11. Figure 4-12. Figure 4-13. Figure 4-14. Figure 4-15. Figure 4-16. Figure 4-17. Figure 4-18. Figure 4-19. Figure 4-20. Figure 4-21. Figure 4-22. Figure 5- ES-3 ES-4 ES-7 ES-7 ES-8 ES-23 .....2-8 .....2-9 ...2-10 ....2-12 ....2-13 ....2-15 ....2-15 ..........2-19 ..........2-19 ..........2-20 ..........2-20 ...........2-22 ............2-22 ............2-24 ............2-27 ............2-29 ............2-31 ............2-32 .............2-34 .......2-36 .......2-37 Implementing RGHRP Study Area and San Luis Valley Map Rio Grande Compact Delivery Requirements versus Annual Index Flows at Del Norte Gage .................................................................................. Coverage of Available Floodplain Mapping Along the Rio Grande ......... Types of Available Floodplain Mapping Along the Rio Grande............... State Street Bridge, Alamosa................................................................. Alamosa Levees, Looking Upstream from State Street .......................... Grade Control Structure at Wrightmuth Site on Alamosa River .............. Bendway Weir at Rosgen Site on Alamosa River................................... Rio Grande Mean Annual Flow, All Gages (Period-of-Record)............... Rio Grande Daily Flow Duration Curves (Period-of-Record) .................. Variability in Mean Daily Flow, Rio Grande Near Del Norte (1968-1998) Variability in Mean Daily Flow, Rio Grande at Alamosa (1968-998) Annual Peak Flows at the Del Norte and Alamosa Gages..... Peak Discharges Along the Rio Grande................................ Example of River Inventory GIS Coverage............................ Structure Built in Floodplain Near South Fork ....................... Rio Grande Channel Profile .................................................. Looking Upstream at Reach A Near South Fork ................... Reach Bl - Upstream of Farmers Union Canal Headgate.... Reach B2 - Downstream of Del Norte .................................. Reach D - Downstream of Stoeber Lane Bridge................... Reach E - Upstream of Costilla Ditch Diversion ................... of Figures RGHRP Study Area and San Luis Valley Map Rio Grande Channel Profile .................................................... Rio Grande Mean Annual Flow, All Gages (Period-of-Record) Peak Discharge Along the Rio Grande................. Structures within the Floodplain ........................... Organizations and Their Primary Responsibilities Non-Structural Projects RGHRP Location Map for Figure ES-l. Figure ES-2. Figure ES-3. Figure ES-4. Figure ES-5. Figure ES-6. Figure Figure 2-1. Figure 2-2. Figure 2-3. Figure 2-4. Figure 2-5. Figure 2-6. Figure 2-7. Figure 2-8. Figure 2-9. Figure 2-10. Figure 2-11. Figure 2-12. Figure 2-13. Figure 2-14. Figure 2-15. Figure 2-16. Figure 2-17. Figure 2-18. Figure 2-19. Figure 2-20. Figure 2-21. Figure 2-22. List ..3-4 3-7 3-8 ..........3-12 ..........3-13 ..........3-14 ....3-18 ....3-20 ...3-21 Flowchart of Sub-Reach Weighted Average Scoring. Bank-Full Capacity and Recurrence Interval............ Comparison of Calculated and Mapped Floodplains Structures within the Floodplain ............................. Flow Characteristics for the 100- Year Flood Event Floodplain in Del Norte ......................................... Floodplain at Upstream End of Alamosa Levees... Structures Affected by Delivery of Compact Flows Flow Characteristics for Compact Deliveries ........ Gage Shifts for Rio Grande Near Del Norte Gage Gage Shifts for Rio Grande Near Monte Vista Gage Shifts for Rio Grande at Alamosa Gage Figure 3-1. Figure 3-2. Figure 3-3. Figure 3-4. Figure 3-5. Figure 3-6. Figure 3-7. Figure 3-8. Figure 3-9. Figure 3-10. Figure 3-11. Figure 3-12.