Guidelines and computer programs for the planning and design of land drainage systems

calcul calculation calidad del agua computer software conception design directrices drainage de surface drainage equipment drainage souterrain drainage systems drenaje de superficie environmental factors equipo de drenaje facteur du milieu factores ambientales guidelines logiciel planification planning principe directeur programas de ordenador red de drenaje socioeconomic environment soil types subsurface drainage surface drainage tipos de suelos type de sol water quality