Laserfiche WebLink
840 <br />0) <br />E 835 <br />co <br />c <br />830 <br />c8 <br />Cv <br />w <br />�, 825 <br />a) <br />J <br />L <br />- 820 <br />815 <br />Figure 5 — Drawdown in Observation Well 8 <br />Drawdown in Observation Well 8 <br />-2400 feet from pumping well (Well 7) <br />October 19, 2019 <br />CO Cfl co O O C9 Cfl C0 C0 co co co C0 co co co N- co co CD CO CO 00 CO CO v- CO CO CO CO CO v- CO CO 0) CO CO C') CO CO CO CO <br />LnLnLnOO--NN0000 LnLnLnOLn000v- CV CV LnLnLn00 <br />.. .. .. .. .. .. . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. <br />0000000OOtiLnLnMC'7,-,-CAmtititiLnLnC.0C'7 NNNOOOC)0000000C000 NCo <br />Ln Cr) Cr) CO N N N ,—,— 0 0 Ln Ln Cr) CO N N N,—,—,— 0 0 0 Ln Ln Ln N N N,— r N— 0 0 0 Ln Ln <br />.. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. <br />I`000�0C)0OOOOO,-r,- NNCoMM,fLnLi, Li, Li, LnLnOCflCOtititiC)000OCOOCACA0)0)CAO <br />N <br />Time <br />During the course of Well 7 pumping, Well 8 at a distance of 2,400 feet observed approximately 6 <br />to 9 feet of d rawdown . <br />The Theis equation predicts a cone of depression approximately 2,448 feet from pumping well 7. <br />Theis Equation for the City of Ramsey <br />Time = <br />0.5 <br />days <br />Theis W(u) Function <br />0.752 <br />unitless <br />Drawdown = <br />6 <br />ft <br />Transmissivity = <br />11493 <br />gpd/ft <br />Pumping Rate = <br />800 <br />gpm <br />Theis u variable = <br />0.390 <br />unitless <br />r2 = 4Ttu 4S <br />Storativity = <br />0.0002 <br />unitless <br />Radius rounded for <br />map <br />2400 <br />ft <br />These results indicate that a single well pumping at current well field spacing does not induce <br />mutual well interference. This 6-foot cone of depression is depicted on Figure 11. <br />However, complexities arise as present-day conditions see the use of 3 to 5 concurrent wells, <br />and a 2040 demand increasing up to a projected 500% daily maximum demand. In order to <br />model these scenarios and their resulting cone of depressions a groundwater model was <br />developed. <br />FEASIBILITY STUDY - DRAFT RAMSY 154354 <br />Page 22 <br />