Watersheds

The watershed data set contains areas of land that contribute runoff and groundwater into a specific stream system. This data set shows the Baltimore County portion of the State-defined Maryland "8-digit" watersheds*. There are 14 major watersheds in Baltimore County. The data was interpreted from Baltimore County's 1953 topographic maps and was delineated at 1:2400 scale. *These features are not identical to the State-defined Maryland "8-digit" watersheds. The features were refined using 1953 topographic data and a larger delineation scale.本流域（watershed）数据集涵盖了可为特定水系提供径流与地下水补给的陆地区域。本数据集展示了马里兰州官方界定的"8位数字编码流域"中属于巴尔的摩县的部分。巴尔的摩县境内共计14个主要流域。本数据集基于巴尔的摩县1953年地形图解译所得，并以1:2400的比例尺完成流域划界。 *注：本次划定的流域要素与马里兰州官方界定的"8位数字编码流域"并不完全一致。本次流域要素系基于1953年地形数据，并以更大的划界比例尺进行了细化优化。