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Mosquitoes are a vector for many global diseases. In Ontario they are associated with transmission of West Nile Virus[https://www.publichealthontario.ca/en/DataAndAnalytics/Pages/WNV.aspx].

<p>Mosquitoes are a vector for many global diseases. In Ontario they are associated with transmission of West Nile Virus[https://www.publichealthontario.ca/en/DataAndAnalytics/Pages/WNV.aspx]. Low impact development technologies reduce the amount of standing water compared to traditional stormwater ponds as most water is stored in voids within soil and gravel layers. The maximum allowable surface ponding time is 24 hours after a storm event. This is less than the time required for one mosquito breeding cycle. But in high density urban landscapes, it may be desirable to have a shorter ponding time. </p>

Low impact development technologies reduce the amount of standing water compared to traditional stormwater ponds. However there are a few additional design recommendations that can reduce mosquito habitat even further:

<p>Where designs do include standing water (e.g. in rainwater harvesting), the following practices can reduce mosquito habitat further:

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<li><strong>Mesh is the first line of defense:</strong> A mesh size of 1.5 mm or smaller is recommended where a screen is used to exclude mosquitoes from a tank or other standing water[http://www.who.int/ith/2017-ith-chapter7.pdf?ua=1], </li>

<li><strong>Mesh is the first line of defense:</strong> A mesh size of 1.5 mm or smaller is recommended where a screen is used to exclude mosquitoes from a tank or other standing water[http://www.who.int/ith/2017-ith-chapter7.pdf?ua=1], </li>