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→Planning Considerations
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<h4>Place in the Treatment Train</h4>
<h3>Place in the Treatment Train</h3>
To maximize the volume of water available for reuse, a RWH system is usually located near to the front of a treatment train. i.e. Upstream of other LID technologies. The most common exception would be where a site strategy employs a [[Green Roofs|green roof]].
To maximize the volume of water available for reuse, a RWH system is usually located near to the front of a treatment train. i.e. Upstream of other LID technologies. The most common exception would be where a site strategy employs a [[Green Roofs|green roof]].
A simple warm-weather system may capture all of the rooftop runoff in an external tank above grade and use it for sub-surface irrigation. In this scenario the tank can overflow via gravity to a sub-surface [[Infiltration chambers|infiltration chamber]] or a [[Bioretention cells|bioretention cell]]. But, if the tank is located below the ground or inside a building the overflow may need a pump.
A simple warm-weather system may capture all of the rooftop runoff in an external tank above grade and use it for sub-surface irrigation. In this scenario the tank can overflow via gravity to a sub-surface [[Infiltration chambers|infiltration chamber]] or a [[Bioretention cells|bioretention cell]]. But, if the tank is located below the ground or inside a building the overflow may need a pump.
<h4>Catchments</h4>
<h3>Catchments</h3>
<p>The origin of the harvested water affects the permissible end uses. Some of the most common uses include irrigation and flushing or toilets and urinals. As mixed source water can only be applied to the more limited end uses, selecting the catchments for a RWH system requires careful consideration. </p>
<p>The origin of the harvested water affects the permissible end uses. Some of the most common uses include irrigation and flushing or toilets and urinals. As mixed source water can only be applied to the more limited end uses, selecting the catchments for a RWH system requires careful consideration. </p>
*The [https://www.ontario.ca/laws/regulation/120332 Ontario Building Code (OBC)] regulates the use of harvested rainwater as one of many non-potable water sources. <em>"Rainwater means storm sewage runoff that is collected from a roof or the ground, but not from accessible patios and driveways."</em>
*The [https://www.ontario.ca/laws/regulation/120332 Ontario Building Code (OBC)] regulates the use of harvested rainwater as one of many non-potable water sources. <em>"Rainwater means storm sewage runoff that is collected from a roof or the ground, but not from accessible patios and driveways."</em>
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===Design===
===Design===
<h4>Sizing & modeling</h4>
<h4>Sizing & modeling</h4>