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HySwap Area-Based Runoff Duration Hydrographs — Massachusetts (7-Day Statistic)

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Created:	Mar 14, 2026 at 12:19 a.m. (UTC)
Last updated:	Mar 14, 2026 at 12:30 a.m. (UTC)
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Sharing Status:	Public
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Abstract

This resource provides a Jupyter Notebook workflow for computing and visualizing area-based runoff duration hydrographs for HUC08 watersheds in Massachusetts using the USGS hyswap (Hydrologic Surface Water Analysis Package) Python package. Daily mean streamflow records are retrieved from the USGS National Water Information System (NWIS) for all streamgages with drainage basins that intersect Massachusetts HUC08 watersheds. Streamflow is normalized by drainage area to produce runoff in millimeters per day and aggregated to the HUC08 scale using an area-weighted mean approach. A 7-day rolling average is applied prior to analysis. Variable percentile thresholds (5th, 10th, 25th, 50th, 75th, 90th, and 95th percentiles) are computed by day-of-year from the full historical record (1990-2024), and Water Year 2024 runoff is overlaid on the resulting percentile envelope for each HUC08. The notebook is designed to run directly on the CUAHSI JupyterHub Python environment with minimal setup.

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Funding Agencies

This resource was created using funding from the following sources:

Agency Name	Award Title	Award Number
USGS	None	None

How to Cite

Read, J. S. (2026). HySwap Area-Based Runoff Duration Hydrographs — Massachusetts (7-Day Statistic), HydroShare, http://www.hydroshare.org/resource/6631c6b1d65f4031b9b67578cf2624ab

This resource is shared under the Creative Commons Attribution CC BY.

http://creativecommons.org/licenses/by/4.0/

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