Development of Ground Water Study Notes for Civil Engineering Exams

By Vishwajeet Sinha|Updated : January 15th, 2017

Development of Ground Water

Darcy Law’s

(i) (For Laminar flow)


Q = Discharge

k = Coefficient of permeability

i = Hydraulic gradient

A = Area of flow.


Where, V = Discharge velocity



Where, Seepage velocity




Constant having value 400.

Hydraulic gradient

Effective size of soil particle

Dynamic viscosity.



Shape factor (which is a function of porosity), packing and grain size distribution).

Average size of particle.

Kinematic viscosity.

Specific yield

Where, Specific yield.

Volume of water yielded under gravity effect.

Total volume of water drained.

Specific retention

Where, Specific retention.

Volume of water retain under gravity effect.

Total volume of water.

Where, Porosity.

Slot Opening

Slot size of D10 of gravel pack material.

Slot size of aquifer design on the basis of finest aquifer.

Pack Aquifer Ratio (P.A)

Well Losses

Jacob-equilibrium formula for confined aquifer,


Drawdown in observation well after time t.

Radial distance of observation well from main pump well.

Coefficient of transmissibility = k.d

Coefficient of storage.

Drawdown of observation well at time

Drawdown of observation well at time


and is the distance of drawdown in time and respectively.

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Vishwajeet SinhaVishwajeet SinhaMember since Jun 2016
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Suman Mondal

Suman MondalJan 15, 2017

Can you share notes of solid waste management@Vishwajeet Sinha

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