Polyline to Swale Lisp

Description

Streamline your civil drafting and grading workflows with PL2Swale. This professional AutoCAD LISP routine eliminates the tedious manual offsetting, filleting, and joining usually required to draft swales, ditches, or trapezoidal channels.

With just a few inputs, transform a simple centerline polyline into a fully drafted, accurately scaled swale layout.

Key Features

• Intelligent Offsetting: Automatically calculates bottom widths and bank offsets based on your specific design parameters.

• Dynamic Cap Generation: Generates smooth, circular “pill” ends for swales using arc-caps, ensuring a professional look for site plans.

• Grade-Ready Layouts: Input your Depth and Side Slope (H:1) to automatically project the top-of-bank lines.

• Optimized Geometry: Joins internal components into a single polyline for the swale bottom, making it easier to manage, hatch, or use for volume calculations.

How It Works

1. Load Lisp
2. Type PL2Swale and hit Enter

3. Select Centerline: Pick any existing polyline representing the flow line.

4. Define Parameters:

   • Enter the Bottom Width.

   • Enter the Depth.

   • Enter the Side Slope (e.g., enter 3 for a 3:1 slope).

5. Instant Generation: The script draws the swale bottom, adds the curved end-caps, and offsets the top banks—all on your current layer.

Tested on AutoCAD 2024 and Newer and AutoCAD LT2024 and Newer