Raincad Suite Jun 2026

RainCAD Suite: The Comprehensive Toolkit for Stormwater Management and Drainage Design In the fields of civil engineering, urban planning, and environmental design, effective stormwater management is no longer just a regulatory requirement—it is a critical component of resilient infrastructure. As climate change intensifies rainfall patterns and urban sprawl increases impervious surfaces, engineers need robust software to model, analyze, and design drainage systems. Enter RainCAD Suite , a powerful, AutoCAD-integrated platform designed to streamline the entire stormwater design workflow. What is RainCAD Suite? RainCAD Suite is a collection of specialized tools and plugins that operate primarily within the AutoCAD environment (including Civil 3D and BricsCAD). Unlike standalone hydrological modeling software that forces users to export and import data repeatedly, RainCAD Suite embeds drainage design directly into the CAD platform. This seamless integration eliminates data translation errors, reduces design time, and allows for real-time updates between the drawing and the hydraulic model. The suite is typically composed of several core modules, each targeting a specific aspect of stormwater engineering: rainfall analysis, drainage network design, detention pond routing, and culvert hydraulics. Core Components of the RainCAD Suite While the exact modules can vary by version or developer (notably by ProSoft or similar civil tech firms), the suite universally addresses the following key areas: 1. Rational Method Hydrology Module The foundation of small to medium-site drainage design is the Rational Method ( Q = CiA ). RainCAD’s module automates this process:

Subcatchment Delineation: Users can draw or select polylines representing drainage areas. The software automatically calculates area, slope, and flow length. Time of Concentration (Tc): Built-in calculators for Tc using methods like Kirpich, Kerby, or TR-55. Rainfall Intensity: Integration with local IDF (Intensity-Duration-Frequency) curves. Users can import curve data, and the software selects the correct intensity based on computed Tc and desired return period (e.g., 10-year, 100-year). Runoff Coefficient (C) Tables: A built-in library of typical C values for different land uses (parking lots, roofs, grassy areas).

2. Drainage Network Design Module This is the heart of the suite. It allows engineers to design and analyze pipe networks from inlet to outfall.

Auto-Layout of Pipes: Given a set of manholes or inlets, the software can suggest optimal pipe alignments, slopes, and sizes based on minimum velocity and cover requirements. Hydraulic Grade Line (HGL) Analysis: Computes energy losses due to friction (Manning’s equation), junctions, bends, and transitions. The module checks for surcharge conditions (where HGL rises above the ground surface). Inlet Capacity Analysis: Calculates how much flow a curb inlet, grate inlet, or combination inlet will capture versus how much will bypass to the next structure. Optimization: The suite can automatically upsize or downsize pipes and adjust slopes to meet design constraints (e.g., maintaining a minimum 3 ft/s self-cleansing velocity). raincad suite

3. Detention and Retention Pond Routing Module Modern regulations require developments to control peak outflow to pre-development levels. This module handles storage routing.

Stage-Storage Curve Generation: Automatically calculates storage volumes from user-defined pond shapes (trapezoidal, irregular, or using existing surface contours from Civil 3D). Stage-Discharge Curve: Models outflow structures including risers, weirs, orifices, and culverts. Routing Methods: Implements the Modified Puls (storage indication) method or Runge-Kutta numerical solutions to compute inflow vs. outflow hydrographs. Multi-Stage Outlets: Designs complex outlets (e.g., low-flow orifice for water quality, mid-level weir for channel protection, top weir for flood control).

4. Culvert Hydraulics Module Culverts are critical for roadway crossings and drainage channels. This module provides: What is RainCAD Suite

Inlet vs. Outlet Control Analysis: Determines which type of control governs the culvert’s capacity. HW/D Ratio Calculations: Computes headwater depth to culvert diameter to ensure roadway overtopping does not occur prematurely. Scour and Velocity Checks: Verifies that outlet velocities are non-erosive or provides energy dissipator design recommendations. Fish Passage Compatibility: Some advanced versions include checks for low-flow conditions to support aquatic life migration.

Key Advantages Over Traditional Workflows 1. Seamless CAD Integration Traditional methods involve drawing a network in CAD, exporting to a separate H&H (Hydrology and Hydraulics) program like HydroCAD or StormCAD, running analysis, then manually updating the CAD drawing. RainCAD Suite eliminates the round-trip. Changes made to the drawing (e.g., moving a manhole) automatically update the model, and vice versa. 2. Real-Time Design Checks As an engineer lays out a pipe, the suite continuously checks for:

Inadequate pipe cover (too shallow or too deep) Flat slopes or reverse slopes Downstream pipes being smaller than upstream pipes (a common design violation) Excessive velocity that could cause pipe erosion Changes made to the drawing (e.g.

3. Automated Reporting Regulatory submissions require detailed reports. RainCAD Suite generates professional, ready-to-submit PDFs including:

Pipe network schedules (size, slope, material, flow capacity) Inlet capture and bypass summaries Pond routing hydrograph plots (inflow vs. outflow) HGL profiles along the main trunk line