10.6084/m9.figshare.1569187.v1 Markus Weiler Markus Weiler Nicole Jackisch Nicole Jackisch The hydrologic outcome of a Low Impact Development (LID) site including superposition with streamflow peaks Taylor & Francis Group 2015 swm discharge analysis retention capacity 30 months superposition volume Stormwater Management hydrologic outcome future LID site designs antecedent conditions Weak performance unfavourable conditions streamflow peaks Hydrology Low Impact Development storm characteristics performance metrics monitoring precipitation hydrologic performance 2015-10-01 00:00:00 Journal contribution https://tandf.figshare.com/articles/journal_contribution/The_hydrologic_outcome_of_a_Low_Impact_Development_LID_site_including_superposition_with_streamflow_peaks/1569187 <div><p></p><p>Hydrology plays a key role in mitigating environmental impacts with Stormwater Management (SWM). Site-level Low Impact Development (LID) is a promising approach but impeded by a lack of experience, performance metrics and comprehensive analysis. This study investigated the hydrologic performance of a small LID site (0.15 km<sup>2</sup>) including superposition with high flows of the receiving stream by monitoring precipitation, discharge and streamflow for 30 months. The results (73% event capture, 66–87% volume reduction, 39 L/ha/s peak discharge, 4.5% streamflow amplification) implied that site-level LID provides an alternative to conventional SWM even for unfavourable conditions. Weak performance related to underground storage, antecedent conditions, storm characteristics and freezing periods occurred seasonally; and a minimum storm capture volume could not be observed, but a maximum retention capacity. Future LID site designs should consider these characteristics and limitations, together with a differentiated analysis of a set of metrics for deducing environmental implications.</p></div>