1. P T A – LARGE DIA By A.V.S.S.Anand Scientist Central Ground Water Board Government Of India (avssanand@yahoo.com) ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS

4. P T A – LARGE DIA Types Of Formations ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS

12. P T A – LARGE DIA Large Diameter Well Excavations in the Ground to Shallow Depths having Significant Water Storage ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS

18. P T A – LARGE DIA Pumping Test Is A Controlled Field Experiment To Find Out The Hydraulic Characteristics Of An Aquifer Or The Yield Characteristics Of A Well ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS

33. P T A – LARGE DIA Slichter’s Method(1906) ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS Where, C= Specific Capacity A= Cross sectional Area S1 = Drawdown when Pumping stopped S2 = Residual draw down at time t’ after pumping stops

37. P T A – LARGE DIA Muskat’s Method(1937) ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS Where, A = Cross Sectional Area r 0 = Distance at which drawdown is negligible at the end of pumping r w = Radius of the well s 1 = Drawdown at the time pumping stops s 2 = Residual Drawdown at time t’ after pumping stops.

42. P T A – LARGE DIA Hvorslev Method(1951) ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS Where, a = Well Radius S = Shape factor K = Permeability h 1 , h 2 = Drawdowns at t 1 and t 2 Times If water enters through base only the Shape Factor = 2* Diameter of the Well. Shape Factor was derived based on the studies from Small Diameter Wells.

46. P T A – LARGE DIA Kumaraswamy Method(1973) ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS

47. P T A – LARGE DIA Kumaraswamy Method(1973) ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS Where, W= Hard Rock Permeability a = Cross Sectional Area D = Static Water Column d 1 = Water Column when pumping stopped. d 2 = Water Column at t R minutes t R = Time Taken For Recouperation

48. P T A – LARGE DIA Kumaraswamy Method(1973) ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS Where, Q max = Maximum inflow Capacity Of the well w = Hard Rock Permeability D = Static Water Column

49. P T A – LARGE DIA Kumaraswamy Method(1973) ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS Where, t R (max) = Time Taken For 99% Recovery a = Area Of Cross Section D = Static Water Column Q max = Maximum inflow

51. P T A – LARGE DIA Zdankus Method(1975) ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS

52. P T A – LARGE DIA Zdankus Method(1975) ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS Modified the Theis Unsteady Confined Radial Flow Equation Where, K =Hydraulic Conductivity U = Drawdown Function Q i = Discharge of Ground Water inflow into the well R = Conditional Radius of Influence r w = Radius of the Well

53. P T A – LARGE DIA Zdankus Method(1975) ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS Where, U = Drawdown Function H = Thickness Of The Saturated Zone s 0 = Drawdown in the aquifer recorded on the wall of the well or in the observation well.

54. P T A – LARGE DIA Zdankus Method(1975) Inflow discharge during Pumping ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS Where, Q i = inflow discharge Q = Discharge of Water Pumped r w = Radius Of Well  s’ 0 = Decline in Water level in the well per  t Time interval.

55. P T A – LARGE DIA Zdankus Method(1975) Inflow discharge during Recovery ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS Where, Q i = inflow discharge r w = Radius Of Well  s’ 0 = Rise in Water level in the well per  t Time interval.

56. P T A – LARGE DIA Zdankus Method(1975) Conditional Radius Of Influence ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS Where, R = Conditional Radius Of Influence S Y = Specific Yield H = Thickness Of The Saturated Zone s 0 = Drawdown in the aquifer recorded on the wall of the well or in the observation well. K = Hydraulic Conductivity

59. P T A – LARGE DIA Papadopulos - Cooper Method(1967) ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS

60. P T A – LARGE DIA Papadopulos - Cooper Method(1967) ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS Where, s = drawdown Q= discharge T= Transmissivity

61. P T A – LARGE DIA Papadopulos - Cooper Method(1967) ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS Where, s w = drawdown inside the well Q= discharge T= Transmissivity

67. P T A – LARGE DIA Boulton and Streltsova Method(1976) ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS

71. P T A – LARGE DIA Singh & Gupta Method (1986) ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS

73. P T A – LARGE DIA ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS Artificial Neural Networks

76. P T A – LARGE DIA Karanjac’s Method (1975) ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS Where, Q r = inflow rate during well recovery t r = time taken for the recovery Q p = Rate of pumping t p = Time taken for pumping

81. P T A – LARGE DIA Romani’s Method (1973) ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS

84. P T A – LARGE DIA ANALYSIS OF PUMPING TEST DATA LARGE DIAMETER WELLS Thank You