ACT & ACF Draft Programmatic Environmental Impact Statements SAD Water Supply Conference Wilmington, NC David Luckie (CESAM-PD) 251-690-2608.

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Presentation transcript:

ACT & ACF Draft Programmatic Environmental Impact Statements SAD Water Supply Conference Wilmington, NC David Luckie (CESAM-PD)

Objectives Determine impacts of a water allocation formula to Municipal & Industrial Water Supply Use data produced by the Comprehensive Studies Quantify the impacts using risk & uncertainty

Secondary Objective To develop a method of determining the expected value of a potential future water shortage, based on insurance theory and using risk and uncertainty

Method For each ‘node’ on the river system: –Obtain net water demand estimates for each flow regime and each HEC-5 model year –Obtain Independent Hydrologic Alternatives scorecard data on HEC-5 model runs –Construct flow frequency distributions

Method (cont.) Multiply demand by its probability of being met (expected supply) Calculate expected shortage (demand - expected supply) Multiply that expected shortage by price Calculate present worth Subjectively determine significance of the expected value

Results Insignificant Impacts in the ACF Basin: Low Flow -$13.5 million Moderate Flow -$8.0 million High Flow -$1.0 million

Results Insignificant impacts in the ACT Basin: Low Flow $74,000 Moderate Flow $1.2 million High Flow$3.6 million

Usefulness We can quantify shortage risk, given HEC-5 outputs and demand estimates Calculate effects of Water Control Plan changes Calculate effects of storage reallocations Calculate effects of storage changes Calculate effects of droughts Calculate user willingness to pay to avoid risk Provide insight towards willingness to pay for conservation

Comments Received “Underestimates willingness to pay” –based on willingness to pay for water, not ‘insurance’ Does not follow NED Procedures in –Didn’t have to: No structural measures being considered, only operational changes