Development of a New Testing Approach for Decentralised Technical Sustainable Drainage Systems

Abstract

A part of the sustainable drainage systems (SuDS) are used to treat stormwater and must be tested for their hydraulic performance and the removal efficiency to assess serviceability and retention of the pollutants efficacy for in situ use. Current test procedures provide a good basis for laboratory testing SuDS on the test stand. However, the evaluation is not sufficiently representative to compare different SuDS with each other or for in situ use. The individual steps and specifications of an applied test procedure in Germany were considered and evaluation and optimizations for the test substance and sampling methodology of SuDS on the test stand were proposed. A comparison of the particle size distribution of the test substance Millisil W4 currently in use and total suspended solids of real road runoff was made, which showed that the presented test substance of real road-deposited sediments (RDS) provides a better reference for the test conditions and they could be the basis for more representative test methods. A particle size distribution was proposed for this new test substance. Furthermore, two methods of sampling were compared, which showed that a full flow sampling is preferable to a discrete sample. At the same time, it was shown that a separation limit of 20 µm is sufficient for the determination of TSS63.

Measures to Reduce the Discharge of tire Wear into the Environment

“…These investigations must include an examination of the total suspended solids retention rate. In order to facilitate this examination, an alternative test substance has been developed, which is made from real road sweepings and better represents the boundary conditions that would be present in real use [99].…”

Rainwater Management in Urban Areas

“…To compare the hydraulic performance and pollutant removal efficiency of SQIDs, comparable test parameters and conditions must be considered, which are not available under real runoff conditions in field studies. Currently there is a testing procedure available in Germany [8] which was improved and optimized by Neupert et al [18]. Not only the testing procedure, but also the sampling strategy was improved.…”

Urban Flood Risk and Economic Viability Analyses of a Smart Sustainable Drainage System

“…In studying the affected area, measuring the risk level can be one measurement 243 method for efficiency when dealing with a new solution such as SuDS [39]. Other tech-244 niques like experimental investigations can be very expensive and hard to provide enough 245 accuracy in the SuDS topic [40]. For that reason, this study analyses the solutions through 246 a risk assessment approach.…”