It is well recognized that a widespread diffusion of subsurface pipe drainage over a large scale can interact with the hydraulic behaviour of reclamation districts, suggesting the needs for ...redesigning the entire excess water control network. Therefore, hydrulic engineers often require a tool to evaluate the suitability of a basin to be drained by pipe systems; the present work intends to propose a method to achieve this goal. The pipe drainage suitability (PDS) of a territory has been defined as the technical possibility to install pipe drainage systems efficient in control of excess water. PDS has been evaluated by a modified FAO land suitability method, assigning the following meanings to the hyerarchies: (i) the orders discriminate lands in suitable and non suitable; (ii) the classes detail on the degree of suitability (high, intermediate, low) or non suitability (temporary, permanent); five classes of suitability have been therefore generated; (iii) the subclasses specify the nature and relevance of the constraints. Owing to the operative scale level, the units have not considered in the classification. Nine indicators have been selected for PDS, regarding pedological (soil texture, organic matter, gravel, rocks, salinity, inhibition layers), hydraulic (soil water conductivity, watertable depth and duration) and climatic (rainfall depth and concentration) properties of the territory; each parameter can limit PDS as described by a specific score on an arbitrary scale. Therefore, PDS results from the sum of the limitation scores. Specific limitations related to the presence of existing land drainage systems, as well as to environmental constrains, are also described
Interesting productivity of the new poplar varieties for biomass [Populus; Italy Mareschi, L. (Università della Tuscia, Viterbo (Italy). Dipartimento di Scienze dell´Ambiente Forestale e delle sue Risorse); Paris, P. (Consiglio Nazionale delle Ricerche, Porano, Terni (Italy). Istituto di Biologia Agroambientale e Forestale); Sabatti, M. (Università della Tuscia, Viterbo (Italy). Dipartimento di Scienze dell´Ambiente Forestale e delle sue Risorse) ...
L'Informatore agrario,
(29 Apr - 5 May 2005), Letnik:
61, Številka:
18
Journal Article
