Name: Streamgages and Base Flow Hydrograph Separation Analyses

Display Field:

Type: Feature Layer

Geometry Type: esriGeometryPoint

Description: <p style="background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(74, 74, 74); font-family:&quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; margin:0px 0px 1.5rem; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;"><span style="font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;"><span style="border:0px solid currentcolor; box-sizing:border-box; line-height:1.5;">&nbsp;This layer displays baseflow hydrograph separation analyses of selected USGS streamgages, as calculated by the Water Supply Program (WSP) through a baseflow separation analysis. Baseflow analysis adapted from computer program Rutledge (1998, USGS W-RIR 98-4148; updated 2012). Estimated 7Q10 low flows updated using USGS Hydrologic Toolbox - Barlow, P.M., et al., 2022, TM 4-D3, 23 p. Precipitation data is from &nbsp;30-year normals 1991-2020 PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed 05 June 2025. Data was originally prepared by P.A. Hammond and J. Smith on 10/31/2000 and revised by J.P. Stokes and L. Reed on 06/05/2025.&nbsp;</span></span></p><p style="background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(74, 74, 74); font-family:&quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; margin:0px 0px 1.5rem; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;"><span style="font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;"><span style="border:0px solid currentcolor; box-sizing:border-box; line-height:1.5;">This information is for planning purposes only and does not replace a site-specific analysis for a water appropriations permit.</span></span></p><p>Disclaimer: This layer should be used for guidance purpose only. Water Supply Program (WSP) at Maryland Department of Environment (MDE) has made every attempt to provide accurate and up to date information on this online map. However, &nbsp;MDE-WSP may have more current or accurate information. MDE-WSP reserves the rights to update the online map as needed. MDE cannot be held responsible for the misuse or misinterpretation of any information and makes no warranty guarantee or representation of any kind of connection to its accuracy, completeness or adequacy. The map contained herein is not to be interpreted or used as a “legal description”. In no event will MDE or State of Maryland be liable for any damages, including but not limited to loss of data, lost profits, business interruption, loss of business information or any other pecuniary loss that might arise from the use of this map or information it contains.</p><p>For more information, please contact the Water Supply Program at water.supply@maryland.gov or 410-537-3702&nbsp;</p>

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Spatial Reference: 102100 (3857)

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Object ID Field: FID

Unique ID Field:

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Global ID Field:

Type ID Field:

Fields:

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• site_no1 (type: esriFieldTypeString, alias: site_no1, SQL Type: sqlTypeNVarchar, length: 254, nullable: true, editable: true)
• gage_nm (type: esriFieldTypeString, alias: gage_nm, SQL Type: sqlTypeNVarchar, length: 254, nullable: true, editable: true)
• HGMR_nm (type: esriFieldTypeString, alias: HGMR_nm, SQL Type: sqlTypeNVarchar, length: 254, nullable: true, editable: true)
• County_nm (type: esriFieldTypeString, alias: County_nm, SQL Type: sqlTypeNVarchar, length: 254, nullable: true, editable: true)
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• D1_year (type: esriFieldTypeInteger, alias: D1_year, SQL Type: sqlTypeInteger, nullable: true, editable: true)
• RD1_bflow (type: esriFieldTypeDouble, alias: RD1_bflow, SQL Type: sqlTypeFloat, nullable: true, editable: true)
• DOR_bflow (type: esriFieldTypeDouble, alias: DOR_bflow, SQL Type: sqlTypeFloat, nullable: true, editable: true)
• DOR_year (type: esriFieldTypeInteger, alias: DOR_year, SQL Type: sqlTypeInteger, nullable: true, editable: true)
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• flow_7Q10 (type: esriFieldTypeDouble, alias: flow_7Q10, SQL Type: sqlTypeFloat, nullable: true, editable: true)
• POR (type: esriFieldTypeString, alias: POR, SQL Type: sqlTypeNVarchar, length: 254, nullable: true, editable: true)
• Precip_in (type: esriFieldTypeDouble, alias: Precip_in, SQL Type: sqlTypeFloat, nullable: true, editable: true)
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• vert_datum (type: esriFieldTypeString, alias: vert_datum, SQL Type: sqlTypeNVarchar, length: 254, nullable: true, editable: true)
• dec_lat (type: esriFieldTypeDouble, alias: dec_lat, SQL Type: sqlTypeFloat, nullable: true, editable: true)
• dec_long (type: esriFieldTypeDouble, alias: dec_long, SQL Type: sqlTypeFloat, nullable: true, editable: true)
• dec_datum (type: esriFieldTypeString, alias: dec_datum, SQL Type: sqlTypeNVarchar, length: 254, nullable: true, editable: true)
• NWIS_Leg (type: esriFieldTypeString, alias: NWIS_Leg, SQL Type: sqlTypeNVarchar, length: 254, nullable: true, editable: true)
• site_no (type: esriFieldTypeInteger, alias: site_no, SQL Type: sqlTypeInteger, nullable: true, editable: true)
• station_nm (type: esriFieldTypeString, alias: station_nm, SQL Type: sqlTypeNVarchar, length: 254, nullable: true, editable: true)
• County (type: esriFieldTypeString, alias: County, SQL Type: sqlTypeNVarchar, length: 254, nullable: true, editable: true)
• nx_gen2 (type: esriFieldTypeString, alias: USGS Next Generation Link v2, SQL Type: sqlTypeOther, length: 256, nullable: true, editable: true)

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Last Edit Date: 8/13/2025 2:38:31 PM

Schema Last Edit Date: 8/13/2025 2:17:32 PM

Data Last Edit Date: 8/13/2025 2:38:31 PM

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