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i <br /> I <br /> i <br /> F <br /> Glassey Farm Well URF Analysis <br /> i <br /> To: Stephanie Luce <br /> i <br /> From: Jacob Bauer <br /> Copy to: bile <br /> Reviewed by: Stephanie Luce <br /> Date: January 16,2017 <br /> Project: Glassey Parcel Acquisition <br /> Attachments: Figure 1 <br /> Purpose <br /> This memorandum provides Unit Response Functions (URFs) for two example well locations on the <br /> Glassey Parcel.The example well locations were chosen to represent the closest and farthest locations <br /> on the parcel where wells or recharge facilities could be installed and demonstrate the range of <br /> potential timing from these two points. <br /> Site Analysis <br /> Figure 1 shows the location of the Glassey Parcel south of the South Platte River in Morgan County,CO <br /> along with the example locations used in this analysis.An initial analysis was completed to determine <br /> the depletion/accretion point for water pumped/recharged from the parcel. We concluded that the <br /> South Platte River is the depletion/accretion point because it is the nearest perennial stream in the <br /> area. <br /> URF Calculation <br /> Daily URFs for the two example locations were calculated using the Integrated Decision Support <br /> Alluvial Water Accounting System (AWAS) model. AWAS implements the Glover (1950 equation to <br /> estimate stream flow depletion or accretion in response to groundwater pumping or recharge.For this <br /> analysis, the "X" distance used in the calculation representing the distance to the accretion/depletion <br /> point (following AWAS notation) was measured as the distance between the example point and the <br /> South Platte River. The distance from the South Platte River to the two example locations plus the <br /> additional distance to the aquifer boundary was used as "W". Data from the South Platte Decision <br /> Support Systems (SPDSS) were used to delineate the aquifer boundary. 'fable 1 presents the <br /> calculation inputs and Figure 1 depicts the measurement distances. <br /> The transmissivity and specific yield of the aquifer were assigned based on published values from the <br /> SPDSS Alluvial Groundwater Model (CDM Smith, 2013). Transmissivity was assigned based on the <br /> SPDSS transmissivity value at the respective example locations. <br /> A LeonardRice <br /> „r. ,t, <br />