Difference between revisions of "Runoff volume control targets"
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===Runoff Volume Control Target (RVC<sub>T</sub>)=== | ===Runoff Volume Control Target (RVC<sub>T</sub>)=== | ||
{{textbox|1="The means to achieve the RVC<sub>T</sub> includes:<br> | {{textbox|1="The means to achieve the RVC<sub>T</sub> includes:<br> | ||
| − | '''Retention''' - where the captured volume shall be ultimately [[infiltration|infiltrated]], [[ | + | '''Retention''' - where the captured volume shall be ultimately [[infiltration|infiltrated]], [[Evapotranspiration|evapotranspired]] or [[Rainwater harvesting|re-used]] and the specified volume will not later be discharged to sewer networks (with the exception of internal water re-use activities) or surface waters and does not therefore become runoff, and |
'''Volume capture and treatment''' - Also referred to as `treatment and release`, where the volume capture and treatment directly aims at reducing surface water impairment through treatment of the specified volume, often referred to as a “water quality volume”.<ref>MOECC (2018)</ref>}} | '''Volume capture and treatment''' - Also referred to as `treatment and release`, where the volume capture and treatment directly aims at reducing surface water impairment through treatment of the specified volume, often referred to as a “water quality volume”.<ref>MOECC (2018)</ref>}} | ||
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Revision as of 01:32, 8 March 2018
Typically designed to handle the smaller, most frequent storm events, LID practices in Ontario are usually sized according to the 90th percentile event. In many areas this translates into events that are < 30 mm in depth. Note that 25 mm is considered to be a suitable representation of the ‘first flush’ volume, and that controlling this amount of runoff may provide stormwater engineers with control over 90 % of the mean annual pollutant load [1].
Runoff Volume Control Target (RVCT)[edit]
"The means to achieve the RVCT includes:
Retention - where the captured volume shall be ultimately infiltrated, evapotranspired or re-used and the specified volume will not later be discharged to sewer networks (with the exception of internal water re-use activities) or surface waters and does not therefore become runoff, and
Volume capture and treatment - Also referred to as `treatment and release`, where the volume capture and treatment directly aims at reducing surface water impairment through treatment of the specified volume, often referred to as a “water quality volume”.[2]