Assessing the Effects of Low Impact Development on the Receiving Headwater Streams of the Northeast Pickering Land Development**

城市土地开发影响了发达流域及其下游河流的健康。流向溪流的地表径流的数量、质量和时间都发生了变化，这是由于屋顶和道路等不透水的陆地表面的增加，以及密集的排水沟、排水管和管道网络，它们迅速将降雨转化为明渠中的水流。一贯观察到的城市河流综合症的症状包括水质差、生物丰富度低和大规模河道侵蚀。典型的雨水管理（SWM）做法，如池塘，可以减少洪水峰值，但不能减少通过河流网络的总水量，并可能对河流温度等其他环境变量产生不利影响。低影响开发（LID）是另一种SWM实践，在加拿大相对较少应用，旨在管理雨水落下的地方，从而减少流向城市河流的水量，并潜在地避免城市河流的许多问题。**建议的东北皮克林（NEP）开发计划打算实施LID特征作为主要的SWM实践，并将该地点恢复到森林水文的自然状态。有机会监测集水区发生的水文和水力变化，并将这些变化与最近对该地区类似系统的研究联系起来，作为评估全面应用LID方法的好处的一种手段。拟议研究的主要目标是建立集水区的水力监测策略，并评估LID对新经济政策水系网络的潜在影响。方法将包括对现有条件的现场表征，使用滑铁卢大学开发的空间分析工具识别通道不稳定区域，使用射频识别转发器（RFID）和冲击板的组合建立自动沉积物输送监测站，并模拟对通道稳定性和沉积物预算的影响。希望这项研究将有助于评估LID的好处，并允许将该网站用作在加拿大实施的模型。********

Urban land development affects the health of the streams in the developed watershed and downstream. The quantity, quality, and timing of surface runoff routed to streams are all changed due to both the increase in land surfaces such as roofs and roads that are impervious to water and the dense network of gutters, drains and pipes that rapidly turn rainfall into flow in open channels. Consistently observed symptoms of the urban stream syndrome include poor water quality, low biotic richness, and massive channel erosion. Typical stormwater management (SWM) practices such as ponds can reduce flood peaks but do not reduce the overall volume of water sent through stream networks and may adversely affect other environmental variables such as stream temperature. Low impact development (LID) is an alternative SWM practice, relatively sparsely applied in Canada, that aims to manage stormwater where it falls, thereby reducing volumes routed to urban streams and potentially avoiding many of the problems of urban streams. **The proposed Northeast Pickering (NEP) development intends to implement LID features as the primary SWM practice and return the site to a natural state of forested hydrology. There is an opportunity to monitor the hydrologic and hydraulic changes that occur in the catchment and to link these changes with recent research on comparable system in the area as a means of assessing the benefits of a comprehensive application of LID approaches. The primary objectives of the proposed research is to establish a hydraulic monitoring strategy for the catchment and evaluate the potential impact of LID on the NEP stream network. Methods will include field characterization of existing conditions, identifying areas of channel instability using a spatial analysis tool developed at the University of Waterloo, establishing an automatic sediment transport monitoring station using a combination of radio frequency identification transponders (RFID) and impact plates, and modelling the impact on channel stability and sediment budgets. The hope is that this research will help evaluate the benefits of LID and allow this site to be used as a model for implementation in Canada.********