OPTIMIZING THE DIMENSIONS OF AGROWELLS IN HARD-ROCK AQUIFERS IN SRI-LANKA

A case study was conducted into the use of large diameter wells (agrow ells) for supplementary irrigation from the hard-rock aquifer in the N orth-Western province of Sri Lanka, Two existing models, a radial grou ndwater flow model and a soil water balance, were used together to rep resent the agrowell irrigation system. A technique is described to opt imise new agrowell systems by deciding the optimum well radii for give n aquifer characteristics and well spacings, or to optimise existing a growell systems by deciding the sustainable irrigable command areas. ( C) 1997 Elsevier Science B.V.