Blue-Green Infrastructure Network: Understanding Runoff Routing and Corridor Connectivity

What is Blue-Green Infrastructure?

Blue-green infrastructure refers to the integration of natural and semi-natural features into urban planning and design. This approach aims to enhance water management, reduce flood risk, improve air quality, and provide recreational spaces. In this context, 'blue' elements include water bodies like lakes and rivers, while 'green' elements encompass vegetation such as parks and green roofs.

The simulation models a 2D city grid where these features are represented by rain gardens and other permeable surfaces that can absorb and manage stormwater runoff effectively.

Steepest-Descent Flow-Routing Model

The steepest-descent flow-routing model is a hydrological technique used to predict the path of water movement across a landscape. It assumes that water flows along the direction of maximum slope, which typically follows the gradient of the terrain. In this simulation, each cell in the grid represents an area with varying elevation and permeability, allowing for realistic modeling of runoff patterns.

By adjusting parameters such as rainfall intensity and corridor density, users can observe how these factors influence water distribution and identify areas prone to flooding or efficient drainage.

Corridor Connectivity and Flood Risk

In the context of this simulation, rain garden corridors are designed to manage stormwater by providing pathways for runoff to infiltrate into the ground. The connectivity between these corridors is crucial as it determines how effectively water can be distributed throughout the grid. High corridor connectivity can reduce localized flooding and improve overall drainage efficiency.

The model also calculates flood risk based on the saturation level of each cell, highlighting areas that are most vulnerable to overflow during heavy rainfall events.

Optimizing Blue-Green Infrastructure

By experimenting with different grid sizes, corridor densities, and rainfall intensities, users can gain insights into the optimal design of blue-green infrastructure. For instance, increasing corridor density can enhance overall connectivity but may also increase initial construction costs.

This simulation provides a valuable tool for urban planners and environmental scientists to test various scenarios and make informed decisions about where to allocate resources for effective stormwater management.

Frequently asked questions

Try it live

Everything above runs in your browser — open Blue-Green Infrastructure Network: Runoff Routing & Corridor Connectivity (2D) and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.