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mark up Drought Contingency Plan- La Porte June 2011 Updatedoc (2).doc <br />In addition, each entity has the ability to supply* its entire water supply* through groundwater <br />production from wells. After 1990, the Harris - Galveston Coastal Subsidence District decreed <br />that no more than ten per cent (10 %) of each entity's yearly water production can be produced <br />from groundwater. Although additional pumping capacity* is planned for peals purposes, <br />groundwater production will be utilized for peaking purposes whenever possible. <br />Temporaii- reductions or disruptions in surface water supply* can be offset by increased <br />groundwater withdrawals. Careful monitoring and management of groundwater withdrawal <br />is necessaiv to avoid exceeding the yearly ten per cent (10 %) limit above. <br />Long -term reductions or disruptions in surface water supply* would require special permission <br />from the Subsidence District to exceed allowable groundwater withdrawal. It is anticipated <br />that conservation measures would be required by the District to allow increased groundwater <br />vvithdravval. <br />C. TRIGGER CONDITIONS <br />Production amounts are based on a seven (7) day* average daily* demand, and include the <br />permitted withdrawal of groundwater. <br />1. Mild Conditions: <br />a. Surface water demand approaching 6,933,000 gallons/day (80% of the pumping <br />capacity* owned by the Authority* at the Southeast Water Purification Plant plus <br />allowed groundwater withdrawal). <br />Or, <br />b. Production at the Southeast Water Purification Plant reduced to a point such that <br />the aggregate surface water demand of the Authority* is 80% of the reduced <br />pumping capacity*. <br />2. Moderate Conditions <br />a. Surface water demand approaching 7,799,000 gallons/day (90% of the pumping <br />capacity* owned by the Authority* at the Southeast Water Purification Plant plus <br />allowed groundwater withdrawal). <br />Or, <br />b. Production at the Southeast Water Purification Plant reduced to a point that the <br />aggregate demand of the Authority* is 90% of the reduced pumping capacity*. <br />3. Severe Conditions <br />a. Surface water demand approaching 8,666,000 gallons/day (100% of the pumping <br />capacity* owned by the Authority* at the Southeast Water Purification Plant plus <br />allowed groundwater withdrawal). <br />Or, <br />Page 2 of 5 <br />