The lateral ice pressure in liquid manure storage tanks in an Ontario region has been found to reach 50 kPa acting over an ice thickness of 0.5 m. The ice thickness, and therefore the lateral ice load, depends on the geographic location. To calculate the lateral ice load for a particular location, a lateral ice pressure of 50 kPa is applied over the ice thickness expected in that location, which can be estimated from the location’s degree-days below 18°C listed in Table 2 of Supplementary Standard SB-1 as follows: ice thickness (location) = 0.5 m × (degree-days below 18°C (location) / degree-days below 18°C (location))