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RULE §230.11Groundwater Availability and Usability Statements and Certification

(a) Groundwater availability and usability statements. Based on the information developed under §230.10 of this title (relating to Determination of Groundwater Availability), the following information shall be provided as specified in §230.3(c) of this title (relating to Certification of Groundwater Availability for Platting):

  (1) the estimated drawdown of the aquifer at the pumped well(s) over a ten-year period and over a 30-year period;

  (2) the estimated drawdown of the aquifer at the subdivision boundary over a ten-year period and over a 30-year period;

  (3) the estimated distance from the pumped well(s) to the outer edges of the cone(s)-of-depression over a ten-year period and over a 30-year period;

  (4) the recommended minimum spacing limit between wells and the recommended well yield; and

  (5) the sufficiency of available groundwater quality to meet the intended use of the platted subdivision.

(b) Groundwater availability determination conditions. The assumptions and uncertainties that are inherent in the determination of groundwater availability should be clearly identified as specified in §230.3(c) of this title. These conditions must be identified to adequately define the bases for the availability and usability statements. These bases may include, but are not limited to, uncontrollable and unknown factors such as:

  (1) future pumpage from the aquifer or from interconnected aquifers from area wells outside of the subdivision or any other factor that cannot be predicted that will affect the storage of water in the aquifer;

  (2) long-term impacts to the aquifer based on climatic variations; and

  (3) future impacts to usable groundwater due to unforeseen or unpredictable contamination.

(c) Certification. Based on best professional judgement, current groundwater conditions, and the information developed and presented in the form specified by §230.3(c) of this title, the licensed professional engineer or licensed professional geoscientist certifies by signature, seal, and date that adequate groundwater is available from the underlying aquifer(s) to supply the estimated demand of the proposed subdivision.

Source Note: The provisions of this §230.11 adopted to be effective July 9, 2000, 25 TexReg 6345; amended to be effective Februay 13, 2003, 28 TexReg 1206

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