Name: SRBC Highest Groundwater Recharge Potential

Display Field: HIGH_POT

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Description: Different geologic materials, structures, and land uses all influence the rate in which water can recharge underlying aquifers. This dataset combines factors influencing recharge through standardization and weighting assignments using the Multi-Criteria Decision Analysis (MCDA)-GIS framework to identify land-surface areas that have the potential to provide a large fraction of recharge. Percent impervious cover, land surface slope, percent sand and clay, depth to bedrock, drainage density, karst density, and fault density are used to describe recharge potential within the Susquehanna River Basin (basin). Many of these data layers are used to predict baseflow via regional regression equations in ungaged locations throughout the Mid-Atlantic region; baseflow is often used as an approximation of recharge. Input criteria were prioritized using the Analytic Hierarchy Process (AHP), which is an additive weighting model that can be combined with MCDA. Three general “first-level factors” were identified based on three primary zones of infiltration or recharge; those include the land surface, shallow-subsurface (soil) geology, and structural/bedrock geology. Weighting assignments of input datasets are presented in the table below. WeightFirst-Level FactorsWeightSecond-Level Factors40Land Cover / Terrain25Percent Impervious15Land Surface Slope20Shallow-Subsurface Geology15Percent Sand2.5Percent Clay2.5Depth to Bedrock40Structural / Bedrock Geology25Drainage Density10Karst Density5Fault DensityThe resulting raster dataset describes recharge potential as an index from 100-500, with 100 illustrating areas of least recharge potential and 500 illustrating areas of highest recharge potential. This polygon feature class represents all land surface areas that have corresponding pixel values within the 5th (or highest) quantile recharge class. Verification of these areas via desktop methods is described in detail in the study report available on the Commission's website at https://www.srbc.net/our-work/reports-library/Areas of high recharge potential may potentially overlie open water in features such as in rivers, streams, lakes, or reservoirs. Open water locations may be suitable for recharge, however some input datasets may not be applicable and/or complete for these areas. We combined “waterbody” features from the National Hydrography Dataset (USGS, 1999) and areas classified as “open water” in the National Land Cover Database (USGS, 2019) to comprehensively describe surface waters in the Basin. High recharge potential areas overlying surface waters are denoted by “Yes-Water” in the “High_Pot” attribute field. Reclassification of input datasets, and dataset sources are described in the "Lineage" section of the metadata.

Copyright Text: Pierre MaCoy, P.G. and Graham Markowitz, P.G., 2023. Identifying Optimal Groundwater Recharge Locations and Critical Aquifer Recharge Areas within the Susquehanna River Basin. Susquehanna River Basin Commission. 4423 North Front Street. Harrisburg, PA 17110.

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• Shape ( type: esriFieldTypeGeometry, alias: Shape )
• SQMI ( type: esriFieldTypeDouble, alias: SQMI )
• Shape_Leng ( type: esriFieldTypeDouble, alias: Shape_Leng )
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