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>

* <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 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.

#Select climate change scenarios – scenarios that correspond with emissions scenarios from step 4 should be chosen from the data source in step 1, ensuring they represent variability among global models and account for uncertainty  

#Select climate change scenarios – scenarios that correspond with emissions scenarios from step 4 should be chosen from the data source in step 1, ensuring they represent variability among global models and account for uncertainty  

#Calculate projected temperature change – Determine mean annual temperature change between reference and future periods using climate change scenarios  

#Calculate projected temperature change – Determine mean annual temperature change between reference and future periods using climate change scenarios  

#Summarize results – Report both the median and 75th percentile of projected temperature changes from all climate change scenarios for use in future IDF curve calculations.  

#Summarize results – Report both the median and 75th percentile of projected temperature changes from all climate change scenarios for use in future IDF curve calculations. }}

[[File:Screenshot 2025-08-29 140530.png|400px|thumb|right|Risk thresholds are a useful tool when prioritizing climate change impact management efforts. Low impact and low frequency events may not require management planning, while high impact and high frequency events require adaptation strategies (MECP, 2022)<ref name = MECP2022>Ministry of the Environment, Conservation and Parks (MECP). 2022. Low Impact Development Stormwater Management Guidance Manual. https://ero.ontario.ca/public/2022-01/Draft%20LID%20Stormwater%20Management%20Guidance%20Manual%202022.pdf</ref>]]

[[File:Screenshot 2025-08-29 140530.png|400px|thumb|right|Risk thresholds are a useful tool when prioritizing climate change impact management efforts. Low impact and low frequency events may not require management planning, while high impact and high frequency events require adaptation strategies (MECP, 2022)<ref name = MECP2022>Ministry of the Environment, Conservation and Parks (MECP). 2022. Low Impact Development Stormwater Management Guidance Manual. https://ero.ontario.ca/public/2022-01/Draft%20LID%20Stormwater%20Management%20Guidance%20Manual%202022.pdf</ref>]]