00000nam 2200000za 4500 9.857268 CaOODSP 20221107155723 cr ||||||||||| 180601s1996 oncad #ob f000 0 eng d CaOODSP eng eng fre n-cn--- NH17-239/1996E-PDF Waller, D. H. Estimation of the contribution of phosphorus from on-site sewage disposal systems to lakes [electronic resource] / by D.H. Waller, B.C. Sauveur and J.D. Mooers ; CMHC Project Officer: A.J. Houston. Ottawa : CMHC, 1996. 1 v. (various pagings) : ill., graphs "March 1996." Digitized edition from print [produced by Canada Mortgage and Housing Corporation]. Includes bibliographical references. "The objective of this research was to develop a modelling methodology that could be used to more accurately estimate phosphorus loads to lakes from on-site sewage disposal systems. Approaches that have been used to estimate phosphorus loads to lakes were reviewed. These approaches do not include explicit consideration of factors and processes that control phosphorus removal in soils. These factors and processes, and commonly available computer models that have been used to describe them, were explored in detail, based on a thorough review of the relevant literature. These reviews led to identification of models - CHEMFLO for the unsaturated zone, and MODFLOW and MT3D for the saturated zone - that offered the capability of representing the factors and processes involved in phosphorus removal. Exploration of the use of these models began with sensitivity analyses, based on a range of typical soil parameters; the results suggest responses, in terms of phosphorus removal, to variations in significant model parameters. Field and laboratory studies provided evidence about possible phosphorus removal under a variety of site and oil conditions. They also provided data for model calibration and verification. Modelling results reported here include the application of field data from one site to calibrate the unsaturated zone model for phosphorus removal, and application of the calibrated model to other sites. Also included are results of groundwater flow modelling in the saturated zone. Continuing work to apply project data to modelling phosphorus movement in the saturated zone is described. This study focused on phosphorus movement at the scale of single properties. Further work is necessary to determine the most effective manner in which this information can be incorporated into watershed-scale estimates of phosphorus loads. Analytical problems that were encountered and resolved are described. The significance of phosphorus detection limits of alternative analytical procedures is discussed"--Abstract. Includes abstract in French. gccst Waste water gccst Lakes Phosphorus Sauveur, B. C. Mooers, J. D. Canada Mortgage and Housing Corporation. PDF 2.68 MB https://publications.gc.ca/collections/collection_2018/schl-cmhc/nh17/NH17-239-1996-eng.pdf