(11C) Transmissivity

06282019, 11:36 AM
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(11C) Transmissivity
An extract (pages 138140) from GROUNDWATER RESOURCES OF SOUTHERN COMANCHE COUNTY, SOUTHWESTERN OKLAHOMA, MS thesis UoP, BENJAMIN BETKE GREELEY, 1986 (294 pgs)
CALCULATOR PROGRAM FOR HEWLETTPACKARD HP11C A calculator program written by Patterson (1984, p.142) for the Texas Instruments TI59 and modified for the HewlettPackard HP11C calculates transmissivity, T, from specific capacity, Q/s, according to a formula by Walton (1970, p.315): T = Q/s [ 264 log ( T t / 2693 r2 S )  65.5 ] where T = transmissivity, gpd/ft., Q/s = specific capacity, gpm/ft., Q = discharge, gpm, s = drawdown, ft., S = storativity of a confined aquifer or specific yield of an unconfined aquifer, fraction, r = nominal well radius, ft., t = duration of pumping, minutes. Enter the program into calculator memory with the following: g P/R Program mode f LBL A Labels and defines beginning of program; A = any alphabetic or numeric key. RCL 2 pumping duration, t × multiplication RCL 1 well radius, r g x² RCL 0 storativity, S, or specific capacity, Sy × multiplication 2693 × ÷ division g LOG 264 × 65.5  subtraction RCL 3 specific capacity, Q/s × g RTN End of program To run the program store the following parameters in the registers, Rn: R0: S or Sy R1: r R2: t R3: Q/s Enter (key in) any initial transmissivity value and begin the program with the keystrokes f A. The "running" display flashes until a calculated T value is shown. Enter this transmissivity and subsequent values with the keystrokes f A until the final transmissivity equals the initial transmissivity. The permeability is the ratio of the transmissivity to the saturated thickness: K = T/b where K = permeability, gpd/ft², T = transmissivity, gpd/ft., b = saturated thickness, ft. BEST! SlideRule 

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