HydroBoa — Third-Party Software Notices and Attributions

Version: 1.0 · Effective: April 2026 · Last updated: 3 July 2026

HydroBoa Ltd operates and integrates the third-party model engines and software components listed below. Except where expressly stated, these engines run exclusively on HydroBoa's cloud infrastructure and their binaries are not distributed to end users. This notice is provided to satisfy the attribution and license conditions of each component. Where any of these components is included in a downloadable or on-premise HydroBoa artifact, this file (as NOTICES.txt) is bundled with that artifact.

No affiliation or endorsement. HydroBoa Ltd is an independent developer. HydroBoa is not affiliated with, sponsored by, or endorsed by the U.S. Environmental Protection Agency (EPA), the U.S. Army Corps of Engineers (USACE) or its Hydrologic Engineering Center (HEC), the Open Water Analytics community, or any other engine author or rights holder. Outputs produced through HydroBoa are not endorsed, certified, or validated by any of them.

To report a missing or incorrect attribution: legal@hydroboa.com.

Model Engines

SWMM — Storm Water Management Model

Author: U.S. Environmental Protection Agency (EPA).
Version integrated: 5.2.4.
License / status: SWMM 5 is developed by the U.S. EPA and released to the public domain. It is provided without warranty of any kind.
Attribution: "SWMM (Storm Water Management Model) was developed by the U.S. Environmental Protection Agency." HydroBoa is not affiliated with or endorsed by the EPA.

EPANET

Integrated build: OWA-EPANET (Open Water Analytics community edition), version 2.3.5, distributed under the MIT License (see below). The original EPANET was developed by the U.S. EPA and released to the public domain; the community-maintained OWA build is MIT-licensed.
License / status: MIT License. The full MIT License text is reproduced in the "License Texts" section below.
Attribution: Copyright (c) Open Water Analytics and EPANET contributors, under the MIT License (full text below). HydroBoa is not affiliated with or endorsed by Open Water Analytics or the EPA.

HEC-RAS — River Analysis System

Author: U.S. Army Corps of Engineers, Hydrologic Engineering Center (USACE HEC).
Version integrated: 7.0.1.
License / status: HEC-RAS is software developed by USACE HEC and made available subject to the HEC Terms and Conditions for Use. It is provided "as is," without warranty, and its use requires acknowledgment of HEC as the source and must not imply USACE or HEC endorsement.
Attribution: "HEC-RAS was developed by the U.S. Army Corps of Engineers, Hydrologic Engineering Center (USACE HEC)." HydroBoa is not affiliated with, sponsored by, or endorsed by USACE or HEC, and Outputs are not USACE/HEC-endorsed.
⚠️ Redistribution gate: Cloud-only execution as operated by HydroBoa is covered by this notice. Any on-premise or downloadable distribution of HEC-RAS (or wine-bundled HEC-RAS binaries) must be separately cleared in writing against the current USACE/HEC Terms and Conditions for Use before distribution. Do not ship HEC-RAS in an on-prem artifact until this is confirmed.

Runtime Components

Wine

Use: Wine is used within HydroBoa's cloud infrastructure to run certain HEC-RAS components (e.g. sediment) on Linux.
License: GNU Lesser General Public License (LGPL) v2.1 or later.
Status: Wine is used only inside HydroBoa's cloud environment and is not distributed to end users. If Wine is ever bundled into a downloadable or on-premise artifact, the LGPL notice and its source-availability / relinking obligations apply and this notice must be updated accordingly.

Other dependencies

Application, library, and container dependencies (e.g. Python packages, base images) carry their own licenses. A complete machine-generated inventory is produced from the project's Software Bill of Materials (SBOM) and attached to downloadable releases.

License Texts

MIT License (applies to OWA-EPANET)

MIT License

Copyright (c) Open Water Analytics and EPANET contributors

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

GNU LGPL v2.1 (applies to Wine, if distributed)

The full text of the GNU LGPL v2.1 is available at https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html and must be reproduced or referenced in any artifact that bundles Wine.

Maintenance note (not part of the public notice): Before any downloadable HydroBoa build ships, (1) paste the exact OWA-EPANET copyright line, (2) confirm the HEC-RAS on-prem redistribution gate, and (3) append the SBOM-generated dependency list. For cloud-only operation, the attributions above are sufficient. See README.md in this folder.