c3d-catchments

Reads Civil 3D catchment and hydrology properties from CivilDocument data.

3|Updated Feb 17, 2026
One-click install
npx skills add https://github.com/hebackus/c3d-api-plugin --skill c3d-catchments
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: c3d-catchments
Source: https://github.com/hebackus/c3d-api-plugin/tree/main/skills/c3d-catchments
Command: npx skills add https://github.com/hebackus/c3d-api-plugin --skill c3d-catchments

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Civil 3D catchments are fundamental to drainage analysis and design, linking surface terrain to pipe networks and informing hydrology calculations.

Core Features & Use Cases

  • Access & enumerate catchments via CivilDocument and Site, enabling site-wide reviews.
  • Read hydrology properties such as area, runoff coefficient, rainfall intensity, and time of concentration.
  • Reference the surface data and support interactive workflows (e.g., watershed delineation) when API access is limited.
  • Compute or validate basic hydrology metrics and prepare data for network design and labeling.

Quick Start

Open Civil 3D, select a site, and inspect catchment properties.

Frequently Asked Questions about c3d-catchments

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I extract catchment properties like runoff coefficient and time of concentration from Civil 3D?

To extract catchment properties, the Skill accesses CivilDocument data to read runoff coefficient, time of concentration, rainfall intensity, and catchment area for site-wide hydrology studies.

Can I perform site-wide drainage studies and watershed delineation using Civil 3D catchments?

Yes, you can perform site-wide drainage studies by enumerating catchments via CivilDocument and Site, enabling watershed delineation and catchment property inspection across multiple sites.

What is the best way to reference surface data when analyzing Civil 3D drainage networks?

The best way to reference surface data is by accessing catchments through the CivilDocument API, which links surface terrain to pipe networks and informs hydrology calculations.

How do I compute and validate basic hydrology metrics for Civil 3D catchments?

You compute and validate basic hydrology metrics by reading catchment area, runoff coefficient, and rainfall intensity from CivilDocument data, then preparing the results for network design.

What are the limitations of using Civil 3D catchments for hydrology analysis when API access is limited?

When API access is limited, the Skill supports interactive workflows for watershed delineation and catchment property inspection by referencing surface data rather than relying solely on direct API calls.