RESUMEN
The Rational Method equation for estimating peak flow rates for stormwater runoff is derived from the balanced design storm unit hydrograph approach presented in the U.S. Army Corps of Engineers HEC Training Document 15. The above fixed constant is found to depend upon the type of unit hydrograph used (i.e., S-Graph) and the log-log slope of the rainfall depth-duration curve, and is easily determined by equating to a known unit hydrograph design storm model peak flow rate result. This new development provides a significant foundation for use of the well-known Rational Method equation in small catchments where depth-area effects are negligible
Asunto(s)
Inundaciones , Lluvia , Caudal de Agua , Control de Crecidas , Métodos , Estados Unidos , Hidrografía , Matemática , Estadística como AsuntoRESUMEN
In urbanized areas, where development is essentially uniform with respect to drainage to streets, the flood damage potential may be related to the flood depth in the adjacent street section. For a particular street geometric cross-section, a given flood depth may be correlated to different levels of flood damage potential depending upon the development of contiguous land areas. The Cost-to-Benefit-Index (CBI) method is a graphical means to communicate important information regarding master planning prioritization of flood control system elements targeted for improvement. Using the CBI approach, decisions can be made regarding which system reach or system elements may be ranked as having the highest priority in scheduling construction. Additionally, a CBI map aids in communicating to the public the relative importance of any particular element with respect to the overall master plan