Changes

<math>I_{fut,D,RT} = I_{ref,D,RT} \times (CC_{adj})^{\Delta T}</math>

<math>I_{fut,D,RT} = I_{ref,D,RT} \times (CC_{adj})^{\Delta T}</math>

; \(I_{fut,D,RT}\): the median estimate of the projected future rainfall intensity of duration ''D'' and return period ''RT''  

* <math style="display:inline">I_{fut,D,RT}</math>: the median estimate of the projected future rainfall intensity of duration ''D'' and return period ''RT''

; <math>I_{ref,D,RT}</math>: historical rainfall intensity, obtained from IDF data produced by [https://climate.weather.gc.ca/prods_servs/engineering_e.html Environment and Climate Change Canada] using stations that are representative of the project site location and have at least 10 years of complete and validated observations. Refer to [https://www.csagroup.org/store/product/2431590/?srsltid=AfmBOop-F2g5zuHESVcAjvrdPKhgh8Yr2pvKZnqaH97tkLZBCvc-TOCB CSA 231:25] for details on calculating from alternative sources of rainfall observations, if required.

* <math>I_{ref,D,RT}</math>: historical rainfall intensity, obtained from IDF data produced by [https://climate.weather.gc.ca/prods_servs/engineering_e.html Environment and Climate Change Canada] using stations that are representative of the project site location and have at least 10 years of complete and validated observations. Refer to [https://www.csagroup.org/store/product/2431590/?srsltid=AfmBOop-F2g5zuHESVcAjvrdPKhgh8Yr2pvKZnqaH97tkLZBCvc-TOCB CSA 231:25] for details on calculating from alternative sources of rainfall observations, if required.

; <math>CC_{adj}</math>: the rainfall-temperature scaling factor (typically 1.07 unless otherwise justified)  

* <math>CC_{adj}</math>: the rainfall-temperature scaling factor (typically 1.07 unless otherwise justified)  

; <math>\Delta T</math>: the projected change in local temperature (°C) between the reference and future time periods. The following procedure should be used to obtain <math>\Delta T</math>:

* <math>\Delta T</math>: the projected change in local temperature (°C) between the reference and future time periods. The following procedure should be used to obtain <math>\Delta T</math>:

#Select climate data source – Use a reputable, bias-corrected, high-resolution data source for Canada (e.g., [https://climatedata.ca/? climatedata.ca]) covering at least 1950–2100  

#Select climate data source – Use a reputable, bias-corrected, high-resolution data source for Canada (e.g., [https://climatedata.ca/? climatedata.ca]) covering at least 1950–2100  

#Define reference period – Must overlap with the historical records used for IDF curves  

#Define reference period – Must overlap with the historical records used for IDF curves