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DEVELOPMENT OF LOCAL DROUGHT TRIGGER LEVELS

DEVELOPMENT OF LOCAL DROUGHT TRIGGER LEVELS. PREPARED BY THE HILL COUNTRY UNDERGROUND WATER CONSERVATION DISTRICT. STATUTORY REQUIREMENTS FOR DROUGHT MANAGMENT. TEXAS WATER CODE Sec.36.1071 Management Plan

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DEVELOPMENT OF LOCAL DROUGHT TRIGGER LEVELS

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  1. DEVELOPMENT OF LOCAL DROUGHT TRIGGER LEVELS PREPARED BY THE HILL COUNTRY UNDERGROUND WATER CONSERVATION DISTRICT

  2. STATUTORY REQUIREMENTS FOR DROUGHT MANAGMENT • TEXAS WATER CODE Sec.36.1071 Management Plan (a) Following notice and hearing, the District shall, in coordination with surface management water entities on a regional basis, develop a comprehensive management plan which addresses the following goals, as applicable: (6) addressing drought conditions TEXAS WATER DEVELOPMENT BOARD RULES Chapter 356.5 Groundwater Management Required Content of Management Plan (a) The executive administrator shall certify a management plan as administratively complete if it uses a planning period of at least ten years and contains the following: (1) management goals ,as applicable (F) addressing drought conditions

  3. DROUGHT MANAGEMENT PLAN COMPONENTS • TRIGGER CONDITIONS • DROUGHT MANAGEMENT STATEGIES

  4. TRIGGER CONDITIONS • GROUNDWATER LEVEL DECLINES • RAINFALL • SPRING DISCHARGE • STREAM AND RIVER FLOW • SOIL MOISTURE • PALMER DROUGHT INDEX • PUMPAGE AND DISTRIBUTION CAPACITIES

  5. PALMER DROUGHT INDEX • Developed by Wayne Palmer of the U.S. Department of Commerce Weather Bureau in 1965 • Focuses on rainfall and soil moisture • Setup on a scale of -5 to 5. The greater the negative number the more intense the drought • Prepared weekly by NOAH • The index is calculated for broad areas which may not be represented of local conditions

  6. ELLENBURGER AQUIFER WATER LEVELS SEPTEMBER 1, 2004

  7. DEVELOPMENT OF A LOCAL DROUGHT INDEX BASED ON: • Palmer Hydrological Drought Index • Aquifer Water Levels from two City of Fredericksburg Ellenburger Monitor Wells • Stream Flow from the Pedernales River at the LCRA gauge site south of Fredericksburg • Rainfall for the previous 10 month total as recorded at Lady Bird Johnson Municipal Park

  8. LOCAL DROUGHT INDEXDATA BASE

  9. LOCAL DROUGHT INDEX REGRESSION REPORT

  10. LOCAL DROUGHT INDEX REGRESSION REPORT

  11. COMPARISON OF THE PHDI AND THE CALCULATED LOCAL DROUGHT INDEX

  12. COMPARISON OF THE LOCAL DROUGHT INDEX AND THE HAHN TEST WELL #1 WATER LEVELS

  13. COMPARISION OF THE LOCAL DROUGHT INDEX AND THE KNAUTH# 1 WATER LEVELS

  14. COMPARISON OF THE LOCAL DROUGHT INDEX TO THE PEDERNALES RIVER FLOW

  15. COMPARISON OF THE LOCAL DROUGHT INDEX AND THE PREVIOUS 10 MONTH RAINFALL TOTALS

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