12-16-14 Regular Meeting of the La Porte Area Water Authority

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Drought Contingency Plan-LPAWA 2009.doc In addition, each entity has the ability to supply its entire water supply through groundwater production from wells. After 1990,the Harris-Galveston Coastal Subsidence District decreed that no more than ten per cent (10%) of each entity's yearly water production can be produced from groundwater. Although additional pumping capacity is planned for peak purposes, groundwater production will be utilized for peaking purposes whenever possible. Temporary reductions or disruptions in surface water supply can be offset by increased groundwater withdrawals. Careful monitoring and management of groundwater withdrawal is necessary to avoid exceeding the yearly ten per cent (10%) limit above. Long-term reductions or disruptions in surface water supply would require special permission from the Subsidence District to exceed allowable groundwater withdrawal. It is anticipated that conservation measures would be required by the District to allow increased groundwater withdrawal. Execution of all water demand management measures shall be in accordance with the Texas Water Code, section 11.039. All future wholesale water contracts (new, renewed or extension) shall include a provision for all water distributed during a period of water shortage to be divided in accordance with the Texas Water Code, Section 11.039. C. TRIGGER CONDITIONS The La Porte Area Water Authority is the contracting party with the City of Houston's Southeast Water Purification Plant. For the purposes of this plan, trigger conditions will be based on the Authority as one system,rather than individual triggers for each entity. Production amounts are based on a seven(7)day average daily demand. 1. Mild Conditions: a. Surface water demand approaching 7,200,000 gallons/day(80% of the pumping capacity owned by the Authority at the Southeast Water Purification Plant). Or, b. Production at the Southeast Water Purification Plant reduced to a point such that the aggregate surface water demand of the Authority is 80% of the reduced pumping capacity. 2. Moderate Conditions a. Surface water demand approaching 8,100,000 gallons/day(90% of the pumping capacity owned by the Authority at the Southeast Water Purification Plant). Or, b. Production at the Southeast Water Purification Plant reduced to a point that the aggregate demand of the Authority is 90% of the reduced pumping capacity. 3. Severe Conditions a. Surface water demand approaching 9,000,000 gallons/day(100% of the pumping capacity owned by the Authority at the Southeast Water Purification Plant). Or, Page 2 of 5