Developing a New Matrix Model to Estimate the Urban Run-Off Water Quality

This research aims at developing a new relation to estimate the urban runoff water quality through urban land use. According to the first phase of this research, six urban characteristics and land use indices have been defined concerning all parameters with either direct or indirect impacts on urban water quality: Population, land use type, meteorological factors, local physiographical parameters, urban patterns etc. have been considered when developing the new indices. Three study areas, including different urban land uses, have been selected in Tehran Metropolitan and urban drains maps and structures have gone under study to determine the sampling points. Multi-statistical analysis, discriminate analysis, and multi-linear regression analysis have been applied for all water quality results and urban indices in each site, with the results revealing very strong relations between urban land use and water quality variation. Temporary population especially in downtown site has proved to be an effective temporal factor on how even public transport could not have any significant effects, in case population density has no significant influence on water quality, as all sanitary waste water in selected sites is collected through urban wastewater systems separately. General slop is a significant factor in hydrocarbons and heavy metals, once they are not alongside the streets route. All told, this paper recommends reusing urban drained runoff locally before joining other regions’ collectors. Here in urban drainage system, collection and aggregation of water could not be an appropriate factor in water quality management unlike river systems. The model could be employed in urban local water consumption management in irrigation and public recovery.