An important first step in channel restoration design is determining appropriate bankfull dimensions. However, bankfull indicators are often absent or unreliable in creeks needing restoration. To help solve this problem, this study developed a series of regional curves for selected hydrophysiographic regions of southern Ontario where the principal controls on channel form, such as surface geology and precipitation, are uniform. The curves relate bankfull dimensions at riffles to watershed drainage area. Riffles were measured since these features tend to have consistent cross-sectional areas whereas pool cross-sectional areas may vary greatly. This study focused on creeks in smaller watersheds (<100 km²) because restoration projects tend to be located in these areas. A total of 31 creeks were measured in three different hydrophysiographic regions of southern Ontario, with at least nine creeks measured in each region. Bankfull geometry equations, as related to drainage area, were developed for the regions of Waterloo, Peel and York-Durham. Bankfull cross-sectional area and drainage area were strongly related (R² ≥ 0.95) in all three regions. The relation between drainage area and other bankfull dimensions, such as width and mean depth, was not as strong but was statistically significant. The results supported combining data from all regions into a single set of composite curves, and it is recommended that these composite curves be applied in practice. The composite regional curves may be used to provide an indication of appropriate bankfull dimensions for an impaired watercourse that lacks reliable bankfull features. The curves may be referenced by stream designers to assist with the design process, and by regulators who are tasked with reviewing channel designs. This paper describes how sites were selected, outlines the process used to collect and analyze data and provides examples of how the curves may be applied to design.

渠道恢复设计的重要第一步是确定合适的堤岸尺寸。但是，在需要恢复的小河中，通常没有或没有可靠的指标。为了帮助解决这个问题，本研究针对安大略省南部的选定水文地理区域开发了一系列区域曲线，这些区域对河道形式的主要控制（例如表面地质和降水）是一致的。曲线将浅滩上的河岸尺寸与流域流域面积相关。由于这些特征倾向于具有一致的横截面面积，而池的横截面面积可能相差很大，因此对波纹进行了测量。这项研究的重点是较小流域（<100 km ²），因为修复项目通常位于这些区域。在安大略省南部的三个不同的水文地理区域中总共测量了31条小河，每个区域至少测量了9条小河。针对滑铁卢，皮尔和约克-达勒姆地区，开发了与流域面积相关的Bankfull几何方程。堤岸的截面积和排水面积密切相关（R ²在所有三个区域中均≥0.95）。流域面积与其他堤岸尺寸（例如宽度和平均深度）之间的关系并不那么强，但具有统计学意义。结果支持将来自所有区域的数据组合到一组复合曲线中，建议在实践中应用这些复合曲线。综合区域曲线可用于为缺乏可靠河岸特征的受损河道提供适当河岸规模的指示。流设计师可以参考这些曲线以协助设计过程，而负责审查通道设计的监管者可以参考这些曲线。本文介绍了如何选择站点，概述了收集和分析数据的过程，并提供了如何将曲线应用于设计的示例。