Stormwater Management Based on Resilient Urban Drainage Strategies

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Role of Resilience in Sustainable Urban Stormwater Management

Typically, best management practices (BMPs) are implemented to help sustainable stormwater management in urban areas. Over recent decades the selection of urban stormwater management measures for a site has been a challenge among urban planners where thecriterion based on flood volume no longer suffices for selecting urban drainage solutions. Therefore there is a need to consider a set of holistic criteria beyond runoff and inundation objectives by which it would be possible to evaluate sustainability of urban drainage projects. Frequent urban flooding events have justified the use of ‘resilience’ concept and pertaining criteria.  This paper proposes a methodology to verify the sustainability of BMPs projects alongside their resilience. The multi criteria decision making (MCDM) technique has been applied for BMPs ranking based on proposed criteria. The methodology has been applied to urban drainage system of a municipal district of Tehran (Iran). Results indicate the effects of manager’s preferences on selecting BMPs. The proposed methodology provides an effective tool for urban managers to adopt more resilient-sustainable decisions in urban areas

A new design for co-extrusion dies: Fabrication of multi-layer tubes to be used as solid oxide fuel cell

Solid oxide fuel cells attract growing attention as an environmentally friendly device that can produce electrical power. Many processing routes are available for fabrication of micro-tubular solid oxide fuel cells, among which extrusion can be considered as the most commonly used method. Recently, a co-extrusion process has been introduced, in which anode and electrolyte layers can be fabricated simultaneously, thus reducing the overall fabrication cost. In this study, a new die design for co-extrusion of ceramic tubes is introduced in which 5 different layers can be fabricated by a single processing step and can be used for fabrication of micro-tubular solid oxide fuel cells. Moreover, an integral model developed for pressure drop in different flow fields of the die. Summing up the pressure drops, the pressure drop in the whole process can be calculated. The SEM images show that the co-extrusion process can be performed successfully and the tube consists of 5 distinct layers