USA SSURGO - Available Water Storage 0-150 cm

The amount of water in soil is based on rainfall amount, what proportion of rain infiltrates into the soil, and the soil"s storage capacity. Available water storage is the maximum amount of plant available water a soil can provide. It is an indicator of a soil’s ability to retain water and make it sufficiently available for plant use. Available Water Storage is a capacity estimate for the top 150 centimeters of soil. It is calculated from the difference between soil water content at field capacity and the permanent wilting point adjusted for salinity and fragments. Available water storage is used to develop water budgets, predict droughtiness, design and operate irrigation systems, design drainage systems, protect water resources, and predict yields. Available water storage is an important input into hydrologic models including the Soil and Water Assessment Tool (SWAT) - a water quality model that is designed to assess non-point and point source pollution at the river basin scale. Available water storagecan also be used as an indication of a soil"s drought susceptibility, for water recharge modeling, to assess a soil"s ability to support crops, and for many other purposes. Dataset Summary Phenomenon Mapped: Amount of water a soil can hold that is available to plants Geographic Extent: Contiguous United States, Alaska, Hawaii, Puerto Rico, Guam, US Virgin Islands, Northern Mariana Islands, Republic of Palau, Republic of the Marshall Islands, Federated States of Micronesia, and American Samoa. Projection: Web Mercator Auxiliary Sphere Data Coordinate System: WKID 5070 USA Contiguous Albers Equal Area Conic USGS version (contiguous US, Puerto Rico, US Virgin Islands), WKID 3338 WGS 1984 Albers (Alaska), WKID 4326 WGS 1984 Decimal Degrees (Guam, Republic of the Marshall Islands, Northern Mariana Islands, Republic of Palau, Federated States of Micronesia, American Samoa, and Hawaii). Units: Millimeters Cell Size: 30 meters Source Type: Discrete Pixel Type: Unsigned integer Source:Natural Resources Conservation Service Update Frequency: Annual Publication Date: December 2025 Data from the gNATSGO database was used to create the layer. This layer is derived from the 30m rasters produced by the Natural Resources Conservation Service (NRCS). The value for available water storage is derived from the gSSURGO map unit aggregated attribute table field: Available Water Storage 0-150cm Weighted Average (aws0150wta). What can you do with this layer? This layer is suitable for both visualization and analysis across the ArcGIS system. This layer can be combined with your data and other layers from the ArcGIS Living Atlas of the World in ArcGIS Online and ArcGIS Pro to create powerful web maps that can be used alone or in a story map or other application. Because this layer is part of the ArcGIS Living Atlas of the World it is easy to add to your map: In ArcGIS Online, you can add this layer to a map by selecting Add then Browse Living Atlas Layers. A window will open. Type "available water storage" in the search box and browse to the layer. Select the layer then click Add to Map. In ArcGIS Pro, open a map and select Add Data from the Map Tab. Select Data at the top of the drop down menu. The Add Data dialog box will open on the left side of the box, expand Portal if necessary, then select Living Atlas. Type "available water storage" in the search box, browse to the layer then click OK. In ArcGIS Pro you can use the built-in raster functions or create your own to create custom extracts of the data. Imagery layers provide fast, powerful inputs to geoprocessing tools, models, or Python scripts in Pro. Online you can filter the layer to show subsets of the data using the filter button and the layer's built-in raster functions. The ArcGIS Living Atlas of the World provides an easy way to explore many other beautiful and authoritative maps on hundreds of topics like this one. Questions? Please leave a comment below if you have a question about this layer, and we will get back to you as soon as possible.土壤含水量由降雨量、雨水入渗土壤的占比以及土壤持水容量共同决定。有效持水量（Available Water Storage）指土壤可提供的、可供植物利用的最大水量，可表征土壤保蓄水分并使水分充分可供植物利用的能力。有效持水量为土壤表层150厘米的持水量估算值，通过田间持水量下的土壤含水量与经盐度和砾石校正后的永久萎蔫点的差值计算得到。 有效持水量可用于构建水量平衡模型、预测干旱程度、设计并运行灌溉系统、规划排水体系、保护水资源以及预测作物产量。其是包括土壤与水评估工具（Soil and Water Assessment Tool, SWAT）在内的水文模型的重要输入参数——SWAT是一款旨在流域尺度评估面源与点源污染的水质模型。此外，有效持水量还可用于表征土壤的干旱敏感性、开展补水模拟、评估土壤支撑作物生产的能力，以及其他诸多应用场景。 数据集摘要 制图表征的地理现象：土壤可储存的可供植物利用的水量。 地理覆盖范围：美国本土、阿拉斯加州、夏威夷州、波多黎各、关岛、美属维尔京群岛、北马里亚纳群岛、帕劳共和国、马绍尔群岛共和国、密克罗尼西亚联邦以及美属萨摩亚。 投影方式：Web墨卡托辅助球体 数据坐标系：WKID 5070 美国本土阿尔伯斯等面积圆锥投影（美国地质调查局版本，适用于美国本土、波多黎各、美属维尔京群岛）；WKID 3338 WGS 1984阿尔伯斯投影（适用于阿拉斯加）；WKID 4326 WGS 1984十进制度坐标系（适用于关岛、马绍尔群岛共和国、北马里亚纳群岛、帕劳共和国、密克罗尼西亚联邦、美属萨摩亚及夏威夷）。 单位：毫米 像元尺寸：30米 源数据类型：离散型 像元类型：无符号整数 数据源：美国自然资源保护局（Natural Resources Conservation Service, NRCS） 更新频率：年度更新 发布日期：2025年12月 本图层基于gNATSGO数据库生成，源自美国自然资源保护局（NRCS）制作的30米分辨率栅格数据。有效持水量数值提取自gSSURGO制图单元聚合属性表中的“有效持水量0-150厘米加权平均值（aws0150wta）”字段。 本图层可应用场景 本图层可在ArcGIS系统中同时支持可视化与分析操作。在ArcGIS Online与ArcGIS Pro中，可将本图层与自有数据及ArcGIS世界生活地图集（ArcGIS Living Atlas of the World）中的其他图层结合，制作可独立使用、或用于故事地图及其他应用场景的高性能Web地图。 由于本图层属于ArcGIS世界生活地图集的一部分，您可轻松将其添加至地图中： 1. 在ArcGIS Online中：依次选择“添加”→“浏览生活地图集图层”，弹出窗口后在搜索框中输入“有效持水量”，找到目标图层后选中并点击“添加至地图”。 2. 在ArcGIS Pro中：打开地图后从“地图”选项卡选择“添加数据”，在下拉菜单顶部选择“数据”，左侧将打开“添加数据”对话框。如有需要，展开“门户”选项并选择“生活地图集”，在搜索框中输入“有效持水量”，找到目标图层后点击“确定”即可。 在ArcGIS Pro中，您可使用内置栅格函数或自定义函数对数据进行定制化提取。影像图层可为Pro中的地理处理工具、模型或Python脚本提供高效且强大的输入数据源。在Web端，您可通过筛选按钮与图层内置栅格功能，对图层进行过滤以显示数据子集。 ArcGIS世界生活地图集提供了便捷途径，可让您探索数百个主题下的众多优质权威地图，与本图层类似。 如有疑问？若您对本图层有任何问题，请在下方留言，我们将尽快回复您。