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Sadhana

, Volume 9, Issue 1, pp 43–55 | Cite as

Computer model for vedavati ground water basin. Part 2. Regional model

  • K Sridharan
  • N S Lakshmana Rao
  • M S Mohan Kumar
  • V Ramesam
Article

Abstract

A computer model for regional ground water resource evaluation, based on the leaky aquifer concept, is presented for the Vedavati basin which is a crystalline hard rock area of 24,200 km2 in Peninsular India. The model can handle nonhomogeneity, anisotropy, varied pumping, rainfall and river stages. The model is calibrated based on regional water level observations for one year. The calibrated model is used to determine the distribution of safe yield, overexploited regions and regions of maximum potential over the basin. Regions which are most affected by drought conditions are also identified.

Keywords

Ground water regional model computer model hard rock leaky aquifer 

List of symbols

Ai

area ofith block

AT

total basin area

CL

leakage coefficient

ei

difference between computed results and field observations of water levels inith block

E

error norm

Fi

recharge factor

h, h

head in the aquifer and watertable head, respectively

h0,h0

head in the aquifer and watertable head at previous time level, respectively

NB, NC, Nr NR, NT

number of blocks, columns in the finite difference grid, river nodes, rows in the finite difference grid and periods over which data is provided, respectively

Q′,Qi, j

ground water withdrawal rate per unit area and at node (i,j) respectively

Ql

net recharge per unit area

Rf

rainfall per unit area per day

S

storage coefficient of deeper aquifer

S

specific yield of aquitard

Tx, Ty

transmissivities in thex direction and in they direction, respectively

x, y

coordinate directions in plan, northeast-southwest and northwest-southeast, respectively

Δx, Δt

space and time steps

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References

  1. Manvinder Singh 1978Numerical modelling for confined aquifer M E dissertation, Indian Institute of Science, BangaloreGoogle Scholar
  2. Nallasamy M 1975Numerical studies on laminar internal separated flows Ph.D thesis, Indian Institute of Science, BangaloreGoogle Scholar
  3. Prickett T A, Lonnquist C G 1971 Selected digital computer techniques for ground water resource evaluation, Bulletin 55, Illinois State Water Survey, Urbana, USAGoogle Scholar
  4. Remson I, Hornberger G M, Molz F J 1971Numerical methods in subsurface hydrology (New York: Wiley Interscience)Google Scholar
  5. Sarma K V N, Sridharan K, Achutha Rao A, Sarma C S S 1986Sādhanā 9: 31–42Google Scholar
  6. Stone H L 1968SIAM J. Numer. Anal. 5: 530–558MATHCrossRefMathSciNetGoogle Scholar
  7. Trescott P C, Larson S P 1977Water Resour. Res. 13: 125–136Google Scholar

Copyright information

© Indian Academy of Sciences 1979

Authors and Affiliations

  • K Sridharan
    • 1
  • N S Lakshmana Rao
    • 1
  • M S Mohan Kumar
    • 1
  • V Ramesam
    • 1
    • 2
  1. 1.Department of Civil EngineeringIndian Institute of ScienceBangaloreIndia
  2. 2.Central Ground Water BoardJayanagar, BangaloreIndia

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