1.1 This test method concerns measurement of the hydraulic capacity of stormwater treatment devices that use filtration as a primary treatment process. This test method may be used to determine the hydraulic capacity of entire commercially available units comprised of one or more internal filters or individual filter units or combinations thereof, referred to collectively in this test method as an element. 1.2 Elements tested shall be of a size commonly manufactured, not a scale model. 1.3 The position and orientation of all filter elements during testing shall be identical to the position and orientation used during normal operation. 1.4 The direction of flow during testing shall be identical to the direction of flow during normal operation. 1.5 As each stormwater treatment device is unique in design and hydraulic capacity, a sufficient number of accurately measured data points are needed to define properly the hydraulic characteristics of each test element. Therefore, it is imperative that the element setup and subsequent testing methodologies be well defined and executed to assure accurate flow and elevation data. 1.6 This test method determines the hydraulic capacity of stormwater filtration elements as defined in 1.1. Test results are not an indicator of the filtration performance with respect to the capture of solids or other materials. The relationship between hydraulic capacity and material capture is typically inverse in nature (that is, as hydraulic capacity increases, material capture descreases). 1.7 Units-The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
There currently exists no independent standard for measuring performance of these filtration products making comparison and proper selection difficult for designers and owners.
Keywordsfilter; flow rate; pressure; hydraulic capacity; specific flow rate
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top