Once values for design return period and duration are available, the design rainfall intensity can be determined from an appropriate intensity-duration-frequency graph or equation for the drainage area location. The design rainfall intensity is the intensity of a constant intensity design storm having the specified design return period and duration equal to the time of concentration for the drainage area. Parameters Needed to Calculate Design Rainfall Intensity
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This article describes how to obtain a value for design rainfall intensity. census divisions for 20 years and a forecast for one to one-and-a-half years are available in the Short-Term Energy Outlook (STEO) Data Browser.The design rainfall intensity in inches/hour is one of the parameters needed to calculate peak runoff rate for design of a variety of stormwater management structures, such as storm sewers, stormwater inlets, and stormwater detention structures, using the Rational Method. Historical monthly and annual population-weighted degree days for U.S. census divisions are available in Tables 1.9 and 1.10 of the Monthly Energy Review. Historical monthly (from 1973) and annual (from 1949) population-weighted degree days data for the United States and U.S. The National Weather Service Climate Prediction Center is a source for historical temperature and degree-day data for the United States. Several weather data-related websites publish daily high and low temperatures and degree days for specific locations. Electric and natural gas utilities may publish degree day information on their websites, and some utilities include degree day data in customer utility bills. Newspapers may publish degree day information in the weather section. Learn more about EIA’s degree day modeling and forecasting methodology. Energy Information Administration (EIA) uses population-weighted degree days to model and project energy consumption for the United States and for U.S. What are population-weighted degree days?ĭegree day data can be weighted according to the population of a region to estimate energy consumption.
People study degree day patterns to assess the climate and to assess the heating and cooling needs for different regions of the country during the seasons of the year. Pacific division includes Alaska and Hawaii. Energy Information Administration, Monthly Energy Review, Table 1.10, June 2022 Note: Population-weighted degree days. The West South Central division had the largest number of cooling degree days in 2019.ĭownload image Cooling degree days by census division in 2021 West Midwest Northeast South Cooling degree days by census division in 2021 F L G A SC NC V A WV DE MD South Atlantic 2,227 NH ME M A CT RI New England 607 VT P A NJ N Y Middle Atlantic 828 TN A L East South Central 1,622 K Y MS I L MI OH IN WI East North Central 909 OK AR L A TX West South Central 2,643 KS NE SD MN I A MO ND West North Central 1,090 NV AZ UT ID CO W Y MT NM Mountain 1,567 C A OR W A Pacific 1,032 Data source: U.S. The total CDD for the two days is 33 CDD.
If the next day has a mean temperature of 83☏, it has 18 CDD. A day with a mean temperature of 80☏ has 15 CDD. Pacific division includes Alaska and Hawaii.Ĭooling degree days (CDD) are a measure of how hot the temperature was on a given day or during a period of days. Energy Information Administration, Monthly Energy Review, Table 1.9, June 2022 Note: Population-weighted degree days.
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Download image Heating degree days by census division in 2021 West Midwest Northeast South Heating degree days by census division in 2021 F L G A SC NC V A WV DE MD South Atlantic 2,365 NH ME M A CT RI New England 5,800 VT P A NJ N Y Middle Atlantic 5,272 TN A L East South Central 3,154 K Y MS I L MI OH IN WI East North Central 5,750 OK AR L A TX West South Central 1,918 KS NE SD MN I A MO ND West North Central 6,058 NV AZ UT ID CO W Y MT NM Mountain 4,720 C A OR W A Pacific 3,332 Data source: U.S.
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