Eli, a hydrologist, models a storms inflow into a wetland as an arithmetic sequence where the first hour delivers 45 mm, and each subsequent hour adds 12 mm more than the previous. How much water enters over 8 hours?

Mon, 04 May 2026 13:03:44 +0000

**How Much Water Enters a Wetland Over 8 Hours? Eli’s Smart Model for Storm Inflow** Ever wonder how wetlands absorb stormwater during intense downpours? A key insight comes from the way rainfall accumulates hour by hour—NASA hydrologists like Eli use mathematical patterns to model these flows, treating water input as an arithmetic sequence. When a storm delivers 45 mm in the first hour and each hour adds 12 mm more than the last, the total water intake over time follows a clear, predictable rhythm. This method helps predict flood risk and ecosystem response—information increasingly vital as extreme weather grows more frequent across the United States. **Why Eli’s Arithmetic Model Is Gaining Attention in the U.S.**
Today, communities and planners are deeply focused on storm resilience, especially in flood-prone regions. With rising rainfall intensity due to climate change, understanding exactly how much water storms deliver—and over what time—shapes better infrastructure and wetland management. Eli’s use of arithmetic sequences exemplifies how hydrologists transform raw data into actionable forecasts. The model shines in its clarity: it breaks down an often chaotic process into structured, reliable numbers, making it a trusted tool in water resource planning from coast to coast. **How Eli Models Storm Inflow Using Arithmetic Sequences**
An arithmetic sequence increases by a fixed difference between terms. In this case, Eli starts with 45 mm in the first hour. Each subsequent hour adds 12 mm more than the prior hour’s addition—meaning hour two delivers 57 mm (45 + 12), hour three adds 69 mm (57 + 12), and so on. Instead of adding 12 mm per hour to the total, the *increment itself grows steadily*. This approach mirrors real-world patterns where runoff accelerates as wetlands become saturated or channels constrict. The formula captures total inflow as the sum of each hour’s contribution:
S₈ = (n/2)[2a + (n – 1)d]
Where:
- n = 8 hours
- a = 45 mm (first hour’s rainfall)
- d = 12 mm (hourly increment)