00000nam 2200000za 4500 9.864049 CaOODSP 20241203113644 cr ||||||||||| 181101t19851986onca ob f000 0 eng d 0662144775 (print) CaOODSP eng eng fre n-cn--- En36-503/137E-PDF En36-503/137E Vandenberg, A. A physical model of vertical infiltration, drain discharge and surface runoff [electronic resource] / A. Vandenberg. Ottawa : National Hydrology Research Institute, Inland Waters Directorate, 1985, c1986. ix, 57 p. : ill. NHRI paper ; no. 25 IWD technical bulletin ; no. 137 Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references (p. 22). "The author identifies the elements of the hydrological cycle and the interrelationships which are directly influenced by soil and surface drainage improvements. A model of this partial cycle is constructed, permitting the assessment of the effect of drainage improvement on the total discharge from a drained plot for a given precipitation input. Total discharge is composed of surface runoff and drain discharge. Particular emphasis is placed on the soil moisture component, infiltration and percolation to the ground-water table. All components except the unsaturated zone are treated as lumped systems, but the unsaturated zone is represented in the model by a stack of up to 50 layers, the moisture transfer between layers being calculated by a forward-finite difference type of calculation based on the physical characteristics of the soil. The effects of the parameters of the model are described and discussed by means of approximately 90 sample runs. The parameters determining storage capacity of the soil influence the shape and peak value of discharge much more than those determining velocity of flow"--Abstract, p. vi. Includes abstract in French. Drainage--Mathematical models Runoff--Mathematical models Hydrologic cycle Canada. Environment Canada. Canada. Inland Waters Directorate. National Hydrology Research Institute (Canada) Technical bulletin (Canada. Inland Waters Directorate) no. 137. (CaOODSP)9.861123 PDF 3.86 MB https://publications.gc.ca/collections/collection_2018/eccc/en36-503/En36-503-137-eng.pdf