Question 21
Given the average rainfall chart for the first 6 months of 2025 in City X (unit: mm), shown in the tables. The study region has area $15\text{ km}^2$. Calculate the total volume of rainwater (in m², as printed in English) from January through June and state the severity level if the rainfall exceeds 1.5 million m³ (if it exceeds the threshold, by what percentage does it exceed?).
