Abstract
Old city centers are often protected against the introduction of new architectural elements and require site-specific and respectful solutions for sustainable water management. Revitalizing part of ancient water systems matches more than one sustainable development goal. Ancient water management tools may be reinterpreted and innovated to preserve environmental resources, cultural heritage, and tradition, leading to new valuable heritage-based solutions (HBSs). The realization of rain water harvesting and reuse (RWHR) systems incorporating ancient elements of old water distribution systems, is proposed as an HBS for sustainable water management in old city centers. The case of Venice ancient cisterns (veras) is examined and discussed.
Highlights
A typical rainwater harvesting and reuse (RWHR) system consists of: (1) A catchment area, collecting rainfall; (2) a drainage system, diverting collected runoff to a storage capacity; and (3) a distribution system for reuse
Efficiency analysis of RWHR may be performed on the base of probability analysis (PA), assuming that daily rainfall depth and dry spell in between two rain events are random variables and considering two consecutive rain events [2]
Efficiency E was estimated as a function of demand ratio DR and k = a/b, under the most conservative assumptions, as
Summary
A typical rainwater harvesting and reuse (RWHR) system consists of: (1) A catchment area, collecting rainfall; (2) a drainage system, diverting collected runoff to a storage capacity; and (3) a distribution system for reuse. Sustainable water management, by the use of RWHR systems, is limited by the possibility to collect enough rainfall over a sufficiently large catchment area and store it in a tank whose capacity allows to fulfill a prescribed reuse schedule. Long dry spells in climate change scenarios, and unsteady water demand, threaten the reliability of RWHR systems and increase the probability of experiencing a system failure within its life. Efficiency analysis of RWHR may be performed on the base of probability analysis (PA), assuming that daily rainfall depth and dry spell in between two rain events are random variables and considering two consecutive rain events [2]. According to Reference [3], results obtained on the base of PA are in good agreement with experimental evidence [1]
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