Utah Aquifer Recharge Discharge Areas

Recharge areas were delineated for the principal aquifers of densely populated basins and valleys of Utah for implementation of state and county groundwater protection plans. This data was compiled from multiple studies and sources. Some data was modified from the original to provide a dataset with consistent scale and attributes. For original data please contact the Utah Geological Survey or the USGS (cited in credits). Bedrock Recharge - Anderson and others (1994) chose not to differentiate between bedrock and aluvial fill when delineating the primary discharge zone while the UGS studies only evaluated the alluvial aquifers making the assumption that potential for contamination in the bedrock aquifers and recharge zones is generally high. We added a bedrock class to the results of the Anderson study to create a more consistent dataset. Bedrock areas are generally considered to occupy the primary recharge zone but may locally discharge large amounts of water at springs or seeps. Primary Recharge - Basin or valley-fill area with a significant downward groundwater gradient lacking confining layers thicker than 20 feet. Secondary Recharge - Basin or valley-fill area with a downward groundwater gradient with a confining layer thicker than 20 feet. Discharge -Basin or valley-fill area where the groundwater gradient is upward. Discharge in unconfined aquifers are areas of springs and seeps. Discharge in confined aquifers will discharge into the overlying unconfined aquifer or to a spring or flowing well. Data last updated 5/24/2016.

为落实犹他州州、县两级地下水保护计划，本数据集针对犹他州人口稠密盆地与河谷中的主要含水层划定了补给区范围。
本数据集整合自多项研究与多类数据源，部分原始数据经调整以确保数据集具备统一的尺度与属性标准。若需获取原始数据，请联系犹他州地质调查局（Utah Geological Survey，简称UGS）或美国地质调查局（USGS，详见致谢部分）。
基岩补给（Bedrock Recharge）：安德森等人（1994）在划定主要径流区时未区分基岩与冲积充填物，而UGS的相关研究仅评估了冲积含水层，并假设基岩含水层与补给区的污染风险普遍较高。为构建一致性更强的数据集，我们在安德森研究的结果中新增了基岩分类项。基岩区域通常被认定为主要补给区，但局部区域可能以泉或渗流的形式大量排泄地下水。
一级补给（Primary Recharge）：指盆地或河谷充填区域内，地下水梯度显著向下且无厚度超过20英尺的隔水层的区域。
二级补给（Secondary Recharge）：指盆地或河谷充填区域内，地下水梯度向下且存在厚度超过20英尺的隔水层的区域。
径流区（Discharge）：指盆地或河谷充填区域内地下水梯度向上的区域。非承压含水层中的径流区表现为泉或渗流区域；承压含水层的径流则会补给上覆的非承压含水层，或通过泉、自喷井排泄。
本数据集最后更新于2016年5月24日。