Headed to the Walnut Creek Campus last weekend to demonstrate some more 🍎 tree grafting and help out Nine Square Feet.
It was chilly, but at least the rain stopped 🌦🙂
Certain precipitation conditions on the basins also showed systematic temporal increases since the 1920s, including annual precipitation, number of seven-day heavy rain events, and the number of days with precipitation. This climatic shift to more multi-day periods of heavy rain appears to be the major reason that hydrologic flooding in the three states has increased since the 1920s. Analysis of the individual major hydrologic floods revealed five different types of precipitation conditions, including snow-melt situations that produced major floods. The primary cause of major floods was prolonged periods of four- to 13-day durations with intermittent moderate to heavy rains, and these events often included heavy, 15-centimeter rainstorms capable of producing flash floods. Causes for Record High Flood Losses in the Central United States
A sensitivity analysis was performed to evaluate the effects of urbanization and climate variability on increasing flood peaks. Results indicated that, on average, urbanization caused a 34% greater increase in peak flows than climate variability. In addition, this study indicated that present discharges are, on average, at least 19% larger than regulatory discharges. Ongoing urbanization may cause flood peaks to become even higher. Impacts of Urbanization and Climate Variability on Floods in Northeastern Illinois
|Dr. Engebretsen, PHC and Jeff Reiland, Abundant Design|
|Ground Breaking November 2017|