Hydrogeological Parameters

Equation

Author

Values

Rate of Delivery

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Raghunath (2006)

Rate of Seepage (Qseepage)

Qseepage = (Q t – ((π D2/4) × d))/t

D = diameter of the well (m).

d = depth of water column (m).

Q = pumping rate (m3/hour).

t = time required for emptying the well (hour).

Raghunath (2006)

10.95

m3/hour

Specific Yield (Sy)

Sy = (2.303/T) log10 s1/s2

s1/s2 = desidual drawdown ratio

T = Time required for water level rising (hour).

Raghunath (2006)

8.546

hr1

Specific Capacity (Sc)

Sc = Sy × A

Sy = Specific yield of the stream deposits.

A = Area of the dug well section

Raghunath (2006)

90.624

m2 day-1

Safe Yield

(Qy)

Qy = Sy A H

Qy = safe yield of the well (m3/s).

A = area of cross section of the well (m2).

H = Safe working depression head (m).

Sy = Specific yield of the soil.

Raghunath (2006)

176.694

m3/day

Transmissibility (T)

T = Sc × 1.2

T = Transmissibility (m2/d).

Sc = Specific Capacity

Raghunath (2006)

108.749 m2/day

Hydraulic Conductivity (K)

K= T/H

T = Transmissibility (m2/d).

H = Saturated thickness (m)

Raghunath (2006)

51.79

m/day

Yield of Alluvial Bed (QG)

QG = K A dh/dl

A = Cross sectional area (m2)

K= Hydraulic conductivity (m/day)

dh/dl= Hydraulic gradient

Darcy’s Law

308.876

m3/day

Packer Test

T = Q ln(R/rb)/2π Pi

Kp = T/L

T = transmissivity (m2/day).

Q = injection rate (m3/day) and it was Zero.

R = radius of influence (m).

rb = radius of borehole (m).

Pi = net injection pressure (m).

T = Transmissivity (m2/day).

L = Length of test zone and equal to 3 m.

Brassington (2007)

0