Beaver Watershed: Dam Cascade, Storm Hydrographs…

What is the Beaver Watershed Simulation?

The simulation models the impact of three beaver dams on a single stream. Each dam creates a pond that modifies water flow through level-pool routing, which affects the timing and magnitude of runoff.

By simulating different storm events and dry spells, it illustrates how these ecosystems adapt to changing conditions and the consequences of removing or altering natural structures.

Key Concepts in Beaver Dam Dynamics

Level-pool routing is a hydrological process where water flows through a series of ponds created by beaver dams. This method allows for controlled release, reducing peak flow and increasing storage capacity.

The NRCS curve-number runoff model predicts the amount of rainfall that becomes surface runoff, which is crucial for understanding how much water will be available in the watershed.

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Impacts on Hydrographs

During a storm event, the dams intercept and store water, leading to a delayed peak flow. This phenomenon is known as the dam's storage capacity and can significantly reduce flood risks.

Dry spells reveal how stored water is released back into the stream, maintaining baseflow and supporting aquatic life during periods of low rainfall.

Domino Effect of Dam Removal

The simulation demonstrates that removing one dam can have cascading effects on the entire watershed. The failure of one dam can trigger a series of failures in downstream dams, highlighting the interconnected nature of these ecosystems.

This model helps in understanding the importance of maintaining natural water management systems and the potential consequences of human intervention.

Frequently asked questions

How does level-pool routing work?

Level-pool routing involves storing water behind a series of dams, which allows for controlled release. This process reduces peak flow rates and increases storage capacity, providing more consistent water availability.

What is the NRCS curve-number method used in this simulation?

The NRCS (Natural Resources Conservation Service) curve-number method estimates runoff from rainfall events based on land use and soil conditions. It helps predict how much of a rain event will become surface water, which is essential for managing beaver-created watersheds.

Why does removing one dam lead to domino effects?

Removing one dam disrupts the natural balance of water storage and release. This can cause increased flow rates in downstream areas, potentially leading to overtopping and failure of other dams that rely on their upstream neighbors for stability.

How does a dry spell affect the watershed?

During dry spells, stored water from beaver ponds is released back into the stream. This helps maintain baseflow and supports aquatic life by providing a consistent water supply during periods of low rainfall.

Try it live

Everything above runs in your browser — open Beaver Watershed: Dam Cascade, Storm Hydrographs, Dry-Season Storage and Domino Failure and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.

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