The hydrologic cycle is greatly modified by man's activities in urbanized environments. Urbanization modifies in particular the runoff process. Several theoretical and empirical models of the evaporation and infiltration processes are compared and evaluated. The parameter sensitivity of these models to changes is discussed. The sensitivity analysis leads to a recommendation of specific methods to estimate the rainfall excess in an urbanized environment. It was found that the proper estimation of the impervious areas directly connected to storm sewers is paramount in the estimation of urban runoff. The rainfall excess-direct runoff transfer is simulated by means of a quasi-linear method which considers the process to be linear within a storm but nonlinear between storms. A dimensionless instantaneous unit hydrograph (IUH) is given which may be rescaled by means of the peak value of the IUH and time to peak which are correlated to watershed and storm characteristics. A simplified lumped nonlinear second order model is studied and its performance is compared with the quasi-linear approach.

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 193-208

Subject/Index Terms

Filing Info

  • Accession Number: 00135899
  • Record Type: Publication
  • Report/Paper Numbers: UKY BU109
  • Files: TRIS
  • Created Date: Oct 26 1976 12:00AM