; <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. |