Update README.md

README.md

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+# USGS Streamflow Near U.S. Power Plants (2022–2023)
+
+This dataset provides daily streamflow observations from the U.S. Geological Survey (USGS) National Water Information System (NWIS) for rivers and streams located near a sampled subset of U.S. electric power plants. It is intended for studies of hydrologic constraints on power generation, climate vulnerability analysis, and machine-learning applications requiring hydrology–infrastructure relationships.
+
+## Contents
+
+The dataset includes:
+
+* 13,140 daily streamflow records
+* 18 matched USGS gauges
+* 50 power plants sampled from the EIA-860 registry
+* Daily streamflow from 2022-01-01 to 2023-12-31 (where available)
+
+Each record represents the discharge at the nearest available USGS gauge to a specific power plant on a specific day.
+
+## Variables
+
+| Column            | Description                                         |
+| ----------------- | --------------------------------------------------- |
+| **date**          | Timestamp of observation (UTC, daily mean)          |
+| **plant_code**    | EIA plant identifier (from EIA-860 plant registry)  |
+| **gauge_id**      | USGS site identifier                                |
+| **discharge_cfs** | Mean daily discharge in cubic feet per second (CFS) |
+| **gauge_lat**     | Latitude of USGS gauge (WGS84)                      |
+| **gauge_lon**     | Longitude of USGS gauge (WGS84)                     |
+
+## Methodology
+
+1. For each sampled power plant, a bounding box of ±0.5° latitude/longitude was used to search for USGS gauges with daily discharge data (`parameterCd = 00060`).
+2. If multiple gauges were found, the closest in geographic distance was selected.
+3. Daily discharge was retrieved for January 1, 2022 through December 31, 2023.
+4. Observations were merged with plant identifiers for cross-analysis.
+
+## Source
+
+* **USGS National Water Information System (NWIS)**
+  Daily Discharge (Parameter 00060)
+  [https://waterdata.usgs.gov/nwis](https://waterdata.usgs.gov/nwis)
+
+## Processing Notes
+
+* Only gauges with available daily discharge time series were retained.
+* Some plants have no nearby gauge; resulting dataset includes streamflow for 18 of 50 sampled plants.
+* All timestamps were converted to pandas datetime format for consistency.
+* All columns use lowercase snake_case formatting.
+
+## Citation
+
+If you use this dataset, please cite:
+
+**2imi9. USGS Streamflow Near U.S. Power Plants (2022–2023). Hugging Face Datasets.**
+[https://huggingface.co/datasets/2imi9/us-power-climate-data-streamflow](https://huggingface.co/datasets/2imi9/us-power-climate-data-streamflow)