US Army Corps of Engineers Hydrologic Engineering Center Technical Considerations for Alamo Lake Operation April 1998 Approved for Public Release. Distribution Unlimited. PR-37
REPORT DOCUMENTATION PAGE Form Approved OMB No. 0704-0188 The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to the Department of Defense, Executive Services and Communications Directorate (0704-0188). Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ORGANIZATION. 1. REPORT DATE (DD-MM-YYYY) 2. REPORT TYPE April 1998 Project Report 4. TITLE AND SUBTITLE Technical Considerations for Alamo Lake Operation 3. DATES COVERED (From - To) 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 6. AUTHOR(S) Michael W. Burnham, CEIWR-HEC Ken Kirby, Private Consultant 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) US Army Corps of Engineers Institute for Water Resources Hydrologic Engineering Center (HEC) 609 Second Street Davis, CA 95616-4687 5d. PROJECT NUMBER 5e. TASK NUMBER 5F. WORK UNIT NUMBER 8. PERFORMING ORGANIZATION REPORT NUMBER PR-37 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/ MONITOR'S ACRONYM(S) Joe Evelyn, Chief 11. SPONSOR/ MONITOR'S REPORT NUMBER(S) Hydraulics and Hydrology Branch US Army Corps of Engineers Los Angeles District (CESPL) 609 Second Street Davis, CA 95616-4687 12. DISTRIBUTION / AVAILABILITY STATEMENT Approved for public release; distribution is unlimited. 13. SUPPLEMENTARY NOTES.The report represents a technical study regarding operation of Alamo Lake to reduce the conflict between objectives for draw-down for maintenance inspections, protection against inundation of bald eagle nests, and support of down riparian obligate. 14. ABSTRACT This study evaluates polices for operating Alamo Lake in Arizona for the Los Angeles District Corps of Engineers. The analyses specifically addresses three questions of interest to the District: (1) can Alamo Lake be operated to protect against bald eagle nest inundation and if so, what are the downstream impacts; (2) can different draw-down schemes for required dam maintenance improve the conflicting conditions; (3) can the operation plan recommended by the Bill Williams River Corridor Technical Committee by improved? Results from a combined approach using an optimization (HEC-PRM) and simulation model of the Alamo system confirmed that the proposed operating rule performs very well. Significant improvements to operation using a flexible draw-down scheme instead of a rigid schedule can be obtained. The chance of inundation of bald eagle nests can be reduced from eighteen to five percent in a year by a different operation strategy, but at a significant impact to other endangered species in the downstream riverine corridor. 15. SUBJECT TERMS Corps of Engineers, Alamo Lake, endangered species, reservoir operation, optimization and simulation modeling, bald eagle nesting, maintenance draw-down, Bill Williams River Corridor 16. SECURITY CLASSIFICATION OF: 17. LIMITATION 18. NUMBER 19a. NAME OF RESPONSIBLE PERSON a. REPORT b. ABSTRACT c. THIS PAGE OF OF ABSTRACT PAGES U U U 19b. TELEPHONE NUMBER UU 94 Standard Form 298 (Rev. 8/98) Prescribed by ANSI Std. Z39-18
Technical Considerations for Alamo Lake Operation April 1998 US Army Corps of Engineers Institute for Water Resources Hydrologic Engineering Center 609 Second Street Davis, CA 95616 (530) 756-1104 (530) 756-8250 FAX www.hec.usace.army.mil PR-37