tailieunhanh - National Pollutant Removal Performance Database

To overcome the limitations of conventional storage, Oracle Exadata Storage Servers use a massively parallel architecture to dramatically increase data bandwidth between the database server and storage. Innovative technologies such as Exadata Smart Scan, Exadata Smart Flash Cache, and Hybrid Columnar Compression enable Exadata to deliver extreme performance for everything from data warehousing to online transaction processing to mixed workloads. Oracle Database Appliance Oracle Database Appliance saves time and money by simplifying deployment, maintenance, and support of high-availability database solutions. It offers customers a fully integrated system of software, servers, storage, and networking in a single box that delivers. | National Pollutant Removal Performance Database Version 3 September 2007 Center for WsHEg PROTECTION 8390 Main Street 2nd Floor Ellicott City MD 21043 FAX The National Pollutant Removal Performance Database v. 2 was recently updated to include an additional 27 studies published through 2006. The updated database was statistically analyzed to derive the median and quartile removal values for each major group of stormwater BMPs. The data are presented as box and whisker plots for the various pollutants found in stormwater runoff. Introduction The National Pollutant Removal Performance Database version 2 Winer 2000 consisted of 139 individual best management practice BMP performance studies published through 2000. An update of the database has since been conducted to include an additional 27 studies published through 2006. The source information for these additional studies is listed in the References section of this document. The updated database was statistically analyzed to derive the median and quartile removal values for each major group of stormwater BMPs Figures 1-7 . All BMP studies considered for inclusion into the database were reviewed with respect to three target criteria 1. Five or more storm samples were collected 2. Automated equipment that enabled flow or time-based composite samples were used 3. The method used to compute removal efficiency was documented Pollutant removal efficiency usually represented by a percentage specifically refers to the pollutant reduction from the inflow to the outflow of a system. The two most common computation methods are event mean concentration EMC efficiency and mass or load efficiency. When more than one method was used to calculate pollutant removal in a specific BMP study mass or load-based measurements of removal efficiency were entered into the database rather than concentration-based measurements. While EMC efficiency averages the inflow and .