In recent years, in Italy and elsewhere, regional regulations based on hydraulic-hydrologic invariance (HHI) principles have taken hold, especially for new development areas. Natural water retention measures (NWRMs) are among the most interesting options to provide the storage and infiltration capacities that are needed to achieve the HHI objectives. A procedure for the design of NWRMs in new development areas under HHI constraints is presented and is based on a simple combination of Soil Conservation Service Curve Number (SCS-CN) method for determining rainfall excess and lag-time method for simulating runoff propagation. Three types of NWRMs can be considered: rain barrels, drainage wells and drainage trenches; five types of synthetic hyetographs can be selected and three different approaches for the determination of critical storm duration applied. The results obtained by applying the procedure in a new development area located in northern Italy are illustrated and some general conclusions are drawn. It clearly emerges that practitioners should pay particular attention to the correct determination of design storm duration in order to avoid large underestimations of NWRMs size. Moreover, different combinations of the three NWRMs can provide the required reduction of peak of runoff after the transformation, but it appears that drainage trenches are more effective with respect to harvesting systems in reducing the peak runoff value.
A procedure for designing natural water retention measures in new development areas under hydraulic-hydrologic invariance constraints / D. Masseroni, G. Ercolani, E.A. Chiaradia, C. Gandolfi. - In: HYDROLOGY RESEARCH. - ISSN 1998-9563. - 50:5(2019 Oct), pp. 1293-1308.
|Titolo:||A procedure for designing natural water retention measures in new development areas under hydraulic-hydrologic invariance constraints|
MASSERONI, DANIELE (Corresponding)
|Parole Chiave:||critical storm duration; hydraulic-hydrology invariance; natural water retention measures; SCS-CN method; sustainable drainage systems; time of concentration|
|Settore Scientifico Disciplinare:||Settore AGR/08 - Idraulica Agraria e Sistemazioni Idraulico-Forestali|
|Progetto:||Un modello per ottimizzare l’utilizzo delle Green Infrastructures a scala territoriale al fine di mitigare gli effetti negativi dei deflussi di piena|
|Data di pubblicazione:||ott-2019|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.2166/nh.2019.018|
|Appare nelle tipologie:||01 - Articolo su periodico|