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

城市土地开发影响已开发流域和下游河流的健康。由于不透水的屋顶和道路等地表面积的增加，以及排水沟、排水沟和管道的密集网络，地表径流进入溪流的数量、质量和时间都发生了变化，这些排水沟、排水沟和管道迅速将降雨转化为明渠中的水流。 一致观察到的城市河流综合征的症状包括水质差，生物丰富度低，和大规模的渠道侵蚀。 典型的雨水管理（SWM）做法，如池塘，可以减少洪峰，但不会减少通过河流网络发送的总水量，并可能对其他环境变量，如河流温度产生不利影响。 低影响开发（LID）是一种替代SWM实践，在加拿大应用相对较少，旨在管理福尔斯的雨水，从而减少流向城市河流的水量，并可能避免城市河流的许多问题。** 拟议的东北皮克林（NEP）开发计划旨在将LID功能作为主要SWM实践，并将场地恢复到森林水文的自然状态。有机会监测水文和水力变化，发生在集水区，并将这些变化与最近的研究可比系统在该地区作为一种手段，评估效益的综合应用LID的方法。 拟议研究的主要目标是建立一个集水区的水力监测策略，并评估LID对NEP河流网络的潜在影响。方法将包括实地描述现有条件，使用滑铁卢大学开发的空间分析工具确定河道不稳定的地区，使用无线电频率识别应答器和冲击板建立自动泥沙输运监测站，并模拟对河道稳定性和泥沙收支的影响。 希望这项研究将有助于评估LID的好处，并允许该网站被用作在加拿大实施的模式。

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.********