Advanced Operating Technique for Centralized and Decentralized Reservoirs Based on Flood Forecasting to Increase System Resilience in Urban Watersheds

Abstract

The frequency of inundation in urban watersheds has increased, and structural measures have been conducted to prevent flood damage. The current non-structural measures for complementing structural measures are mostly independent non-structural measures. Unlike the current non-structural measures, the new operating technique based on flood forecasting is a real-time mixed measure, which means the combination of different non-structural measures. Artificial rainfall events based on the Huff distribution were used to generate preliminary and dangerous thresholds of flood forecasting. The new operation for centralized and decentralized reservoirs was conducted by two thresholds. The new operation showed good performance in terms of flooding and resilience based on historical rainfall events in 2010 and 2011. The flooding volume in the new operation decreased from 6617 to 3368 m 3 compared to the current operation in 2010, and the flooding volume in 2011 decreased from 664 to 490 m 3 . In the 2010 event, the results of resilience were 0.831835 and 0.866566 in current and new operations, respectively. The result of resilience increased from 0.988823 to 0.993029 in the 2011 event. This suggestion can be applied to operating facilities in urban drainage systems and might provide a standard for the design process of urban drainage facilities.

Real-Time, Smart Rainwater Storage Systems: Potential Solution to Mitigate Urban Flooding

“…This limitation can be overcome with the aid of smart technologies, which enable rainwater tanks to be emptied based on knowledge of impending rainfall events, thereby maximizing available retention storage [14,[23][24][25]. For example, South East Water (Melbourne, Australia) use controlled outlets to empty rainwater tanks before a forecasted storm event, which can maximize retention capacity to reduce peak flows [26,27]. However, smart rainwater tanks operated by simply emptying tanks prior to a storm event, so that they essentially behave like a retention tank during a storm event, can be limited in their ability to reduce peak flows for storm events that have large volumes of runoff [18,28].…”

Probabilistic Modelling of Sustainable Urban Drainage Systems

“…This aspect must coexist with the necessity to limit overflows to drainage system. In literature there are several studies on SuDS, to analyse their performance and to define their characteristic parameters (Berndtsson, 2010;Carter and Rasmussen, 2007;Hakimdavar et al, 2014;Herrera et al, 2018;Lee, 2019;Li et al, 2017;Marchioni and Becciu, 2015;Marchioni and Becciu, 2018;Newman et al, 2013;Palermo et al, 2019;. They are often based on continuous simulation, design approach or experimental formulas.…”

Probabilistic modeling of sustainable urban drainage systems

“…In literature, there are several studies on SUDS that evaluate their performance and analyze their characteristic parameters (Berndtsson 2010;Carter and Rasmussen 2007;Hakimdavar et al 2014;Herrera et al 2018;Lee 2019;Li et al 2017;Marchioni et al 2022;Newman et al 2013;Palermo et al 2019;Palla et al 2012). Traditional methods are based on continuous simulation, design approaches, or experimental formulas.…”