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Description of HydroCAD 10.20‑7a
HydroCAD 10.20‑7a (release 7a) represented a major platform upgrade—the largest to date, adding a suite of advanced hydrology/hydraulics tools without sacrificing ease of use.
Core Capabilities of HydroCAD 10.20‑7a (release 7a)
Combines support for SCS/TR-20, TR-55 typical hydrograph, and SBUH (Santa Barbara Urban Hydrograph) methods within one interface
Provides on-screen routing diagrams—a visual schematic of subcatchments, reaches, ponds, and diversions facilitating quick edits and automatic recalculation
🛠️ Key New Features Introduced in HydroCAD 10.20‑7a
Rainfall & Hydrograph Enhancements:
Download or enter local NOAA, NRCC, and other rainfall data.
Generate synthetic rainfall distributions and create custom IDF and TR-20 files.
Built-in rainfall library with lookup events and an improved editor
CAD Integration & Watershed Data:
Direct import of subcatchment data from AutoCAD drawings—map soil groups, land use, image or CSV formats in one click
Outlet Device Options:
Expanded set of device types: siphons, tubes, float‑activated valves, skimmers, constant‑flow devices, asymmetrical weirs.
Feature to model progressive dam breach behavior based on time or hydraulic elevation
Storage Chamber & Pond Modeling:
Expanded chamber library; automatic layout including end-cap and header handling.
Automatic storage-side calculations with elevation-hydrograph linking, supporting embedded chambers and pond storage features
Reporting & Diagram Enhancements:
Enhanced node and routing reports.
Custom text/image nodes to annotate diagrams visually.
Arch pipe lookup tables and updated documentation support
🧠 What Else to Know
HydroCAD 10.1 and 10.2 built on this foundation through dozens of incremental builds—adding undo‑redo history, Tc procedures, new chambers and outlets, delay valves, and CAD support enhancements (e.g., BricsCAD imports)
Users report that HydroCAD 10 remained extremely stable and intuitive, with upgrades preserving workflow and output consistency
🎯 Practical Use Cases
HydroCAD 10.20‑7a (release 7a) is ideal for:
Standard hydrology modeling using SCS, TR‑20, TR‑55, or SBUH methods.
Projects requiring imported watershed geometry from CAD tools.
Complex outlet device modeling (e.g. skewed weirs, siphons, staged dam breach).
Modeling stormwater detention/underground chamber systems with elevation‑storage calculations.
High‑quality routing diagrams, reporting, and professional layout presentations.
In Summary
HydroCAD 10.20‑7a (release 7a) is the most advanced and hyper‑up‑to‑date version currently available. Released in May 2025, it brings critical compatibility with AutoCAD 2026, adds new stormwater chamber models, and improves output and licensing workflows significantly.
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