Location and population served by domestic wells in California

This dataset identifies the number of individually-owned domestic wells, and the number of households relying upon domestic water supply in the state of California. The number of wells and households are summarized for each Public Land Survey System (PLSS) section. The well locations were determined from more than 635,000 scanned well-completion reports (WCRs) provided by the California Department of Water Resources in 2011. This is only a partial sample of the total number of WCRs (estimated at 1 to 2 million in total). The number of domestic wells was estimated based upon a spatially distributed and randomized survey that determined the Township Ratio (TR) for each township in the state (4,692 in total). Each township generally contains 36 sections (6 x 6). The total number of wells within a section was multiplied by the corresponding TR to estimate the number of domestic wells within each section. See the "TRatio" column in the attribute table. Each section within the same township will have the same Township Ratio. The domestic household data are from the 1990 US Census. These data were provided at the census tract level and were subsequently aggregated to PLSS sections that contained a domestic well. In the case where census tract data identified households using domestic supply, but there were no domestic wells within the tract, the household data were distributed evenly to all sections within the tract. In San Luis Obispo County, the scanned WCRs were incomplete. Therefore, a surrogate method was used. The total number of households reported by the 1990 census did not change; only the distribution of where those households existed within the tract changed. A WCR was considered an individually-owned domestic well if the primary use of the well was identified as being domestic, the owner was an individual, and the well was not destroyed as of 1990. See the larger body work (Johnson and Belitz 2015) for more details.本数据集统计了加利福尼亚州境内个人自有家用井的数量，以及依赖家用供水系统的住户总量。数据以公共土地测量系统（Public Land Survey System, PLSS）的区块为单位进行汇总。 井位信息源自2011年加利福尼亚州水资源部提供的逾63.5万份扫描版完井报告（Well-completion Reports, WCRs），但该样本仅为全部完井报告的一部分——据估算，完整的完井报告总量约为100万至200万份。 家用井的数量基于一项空间分布随机调查进行估算：该调查确定了全州所有镇区（共计4692个）的镇区比例（Township Ratio, TR）。每个镇区通常包含36个区块（规格为6×6）。将单个区块内的总井数乘以对应镇区比例，即可估算出该区块内的家用井数量，具体可参见属性表中的“TRatio”字段。同一镇区下的所有区块拥有相同的镇区比例。 家用供水住户的数据源自1990年美国人口普查，原始数据以普查街区组为单位提供，后续被汇总至拥有家用井的PLSS区块中。若某普查街区组内仅识别到使用家用供水的住户，但未记录到家用井，则将该街区组内的住户数量平均分配至该街区组内的所有区块中。 圣路易斯奥比斯波县的扫描版完井报告存在缺失，因此采用了替代估算方法。1990年人口普查报告的住户总数量未发生变化，仅调整了该街区组内住户的空间分布情况。 若一口井的主要用途为家用、所有者为个人，且截至1990年尚未被废弃，则将其认定为个人自有家用井。更多详细信息可参阅Johnson与Belitz（2015）的相关研究成果。