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Q-2, r. 9.01 - Design code of a storm water management system eligible for a declaration of compliance
Section 160
Disposition versions
160. The maintenance program must include
(1) the manufacturer’s maintenance plan for the hydrodynamic separator installed;
(2) the value of the maintenance threshold and the indication that maintenance is required where the accumulated sediments exceed the maintenance threshold; the maintenance threshold is the sediment level for which the distance between the water surface and the top of the accumulated sediments in the separator tank is less than 85% of the distance between the surface of the water and the preloading level of the sediments present in the hydrodynamic separator tank tested during the performance tests, after the scaling of the distance proportionally to the diameters of the separator installed and tested; and
(3) an indicator of the expected number of years of operation without maintenance of the hydrodynamic separator, expressed in years, established using equation 4-21:
Equation 4-21: N = VMES/(Msed. × Aimp × P/100)
where:
| N | = | Expected number of years of operation without maintenance (year); | |
| VMES | = | Volume available in the tank for the accumulation of sediments situated below the maintenance threshold (m3); | |
| Msed. | = | Volume of sediments produced per year per hectare (m3/year/ha); | |
| Aimp | = | area of the impervious surfaces drained to the hydrodynamic separator (ha); | |
| P | = | suspended matter reduction performance associated with the loading rate determined form the performance cure plotted under section 157 (%). |
In force: 2020-12-31
160. The maintenance program must include
(1) the manufacturer’s maintenance plan for the hydrodynamic separator installed;
(2) the value of the maintenance threshold and the indication that maintenance is required where the accumulated sediments exceed the maintenance threshold; the maintenance threshold is the sediment level for which the distance between the water surface and the top of the accumulated sediments in the separator tank is less than 85% of the distance between the surface of the water and the preloading level of the sediments present in the hydrodynamic separator tank tested during the performance tests, after the scaling of the distance proportionally to the diameters of the separator installed and tested; and
(3) an indicator of the expected number of years of operation without maintenance of the hydrodynamic separator, expressed in years, established using equation 4-21:
Equation 4-21: N = VMES/(Msed. × Aimp × P/100)
where:
| N | = | Expected number of years of operation without maintenance (year); | |
| VMES | = | Volume available in the tank for the accumulation of sediments situated below the maintenance threshold (m3); | |
| Msed. | = | Volume of sediments produced per year per hectare (m3/year/ha); | |
| Aimp | = | area of the impervious surfaces drained to the hydrodynamic separator (ha); | |
| P | = | suspended matter reduction performance associated with the loading rate determined form the performance cure plotted under section 157 (%). |
