2014 Session

Budget Amendments - HB30 (Member Request)

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Chief Patron: Byron
Probable Maximum Precipitation Investigation

Item 357 #2h

Item 357 #2h

First Year - FY2015 Second Year - FY2016
Natural Resources
Conservation and Recreation, Department of FY2015 $485,000 FY2016 $0 GF

Page 299, line 34, strike "$72,540,947" and insert "$73,025,947".
Page 299, line 37, strike the first $2,60,831" and insert "$3,085,831."
Page 301, after line 45, insert:
"3.  Out of the amounts for this item, $485,000 the first year from the general fund is provided to conduct an investigation and analysis to update the Probable Maximum Precipitation (PMP) for locations and watersheds within or effecting the Commonwealth in order to provide more accurate information upon which an impounding structure owner or operator's spillway construction or remediation design is based.  Such investigation shall be completed within 18 months.  Upon completion of such an investigation, the Virginia Soil and Water Conservation Board shall consider such results, and upon the Board's acceptance, shall authorize the use of the updated PMP values in Probable Maximum Flood calculations, thus replacing PMP values from older federal Hydrometeorological Reports (HMR). Owners of impoundment structures regulated under Virginia's Impounding Structure Regulations (4VAC50-20) may apply for a provision license from the Department of Conservation and Recreation that shall allow impoundment structures to continue to function with no upgrades until the storm-based analysis required has been completed.  After the new PMP values are adopted, the impoundment structures shall be reevaluated to determine if remediation efforts are required."

(This amendment provides general fund dollars for the Department of Conservation and Recreation to have an investigation and analysis completed that will provide reliable and reproducible PMP values using updated storm data, state-of-the-science technologies, and current meteorological understanding. The amendment would also allow owners of impoundment structures to apply for a provisional license from the Department of Conservation and Recreation that would allow the impoundment structure to continue to operate without any upgrades until the analysis is completed. Current PMP values for the Commonwealth are based on NOAA's National Weather Service guidance produced over 30 years ago in HMR documents for which funding for updates has ceased. Such investigation would build upon a foundation of accepted storm evaluation techniques, such as those found in HMR's, a number of important regional and site-specific basin characteristics which affect the occurrence and location of PMP-level storms and the production of extreme precipitation, and other key factors including but not limited to basin elevation, regional and basin terrain influences, available atmospheric moisture, seasonality of storm types, and storm maximization that when combined result in refined, study areas-specific PMP estimates. PMP values generally will be provided at area sizes from 1-square mile to 50,000 square miles and at durations of 1 to 72 hours.)