# 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)

Where,

Q = Discharge

k = Coefficient of permeability

i = Hydraulic gradient A = Area of flow.

(ii) Where, V = Discharge velocity

(iii) Where, Seepage velocity Porosity.

(iv) Where, Constant having value 400. Hydraulic gradient Effective size of soil particle Dynamic viscosity.

(v) Where, 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, Where, 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  Where, and is the distance of drawdown in time and respectively.

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