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PERMFILE121316
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Last modified
8/24/2016 10:19:44 PM
Creation date
11/25/2007 9:15:10 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Section_Exhibit Name
EXHIBIT 39 MINE INFLOW ESTIMATES
Media Type
D
Archive
No
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y Getty Task 2 Page 4 bferch 1, 1983 <br />I <br />(• <br />the top of the aquifer. Vertical inflow is allowed only is are es where the <br />initial piezometric head is greater than the top of the aquifer. This <br />approzimatioa allows the simulation to be performed without requiring <br />knowledge of the actual head distribution in the Twentymile aquifer. It <br />should be noted that this approach also assumes that water is not limited in <br />I the Txentymile aquifer. <br />Although calibration can be achieved with the inflow model by setting all <br />values of the TON array to large times, calibration was performed with a model <br />that does not have inflow calculation capabilities. Since inflows are not <br />seeded daring calibration, the smaller model can be utilized and faster <br />ezecntioa is realized and less core memory is required. Daring the inflow <br />~ calculations, the model checks to see which grids are active mine grids daring <br />a time step. The piezametric head in active mine grids is set equal to the <br />bottom elevation of the coal and is held constant during the period is which <br />mining is active in those grids. Lateral inflow to each active mine grid from <br />the four neighboring grids is calculated at the end of each time step. The <br />equation for flow from a neighboring grid to the mine grid is given by: <br />I• <br />Q - KaA dl (1) <br />where Q = lateral inflow, <br />~ K =average hydraulic conductivity between grids, <br />a <br />A =flow area, <br />I dh = head difference between grids, and <br />~ dl = distance between grids. <br />As as example of how equation 1 is utilized consider flow in the s-direction <br />from grid (J,I-1) to mine grid (J,I). Using variable games consistent with <br />those utilized by the program sad identified previously, the variables is <br />Equation 1 can be calculated: <br /> <br />OX(I) + DX (I-1) <br />K = ----------------- <br />a _ DX(I) _ DX (I-1) _ <br />• FK(J,I) + FK(J,I-1) <br />dh = lIT(J,I-1) - ]II(J,I) <br />(2) <br />(3) <br />
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