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Significance and Use
5.1 Each device has unique flow patterns and turbulence characteristics and may exhibit a wide range of efficiencies as discharge, particle-size distribution, particle density, and flow viscosity (that is, water temperature) changes. The testing procedures described in Section 8 provide a method of measuring the removal efficiency of these devices under a given flow condition, flow viscosity (water temperature), and particle-size distribution and density. Therefore, the results of testing represent the flow, viscosity, and particle-size distribution tested.
1.1 This test method concerns measurement of the efficiency of hydrodynamic separators and underground settling devices in removing suspended sediment from simulated stormwater runoff under conditions defined herein. This test method is not intended for use in determining field removal efficiency.
1.5 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 non-conformance with the standard.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D422 Test Method for Particle-Size Analysis of Soils
D854 Test Methods for Specific Gravity of Soil Solids by Water Pycnometer
D4959 Test Method for Determination of Water (Moisture) Content of Soil By Direct Heating
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves
ICS Number Code 13.060.30 (Sewage water)
UNSPSC Code 47101500(Water treatment and supply equipment)