随着世界各地干旱的加剧，研究人员继续开发更有效地循环水的方法。 一种方法是回收从水槽、厕所和淋浴间流出的废水。你可能认为这是不可能的（甚至可能这很恶心），但这项技术已经存在并且正在改进。 在目前的大多数情况下，这些废水在排放到当地水道之前要经过几个处理过程。 图 2 显示了水源和使用应用的示例。 处理设施使用各种技术来满足适合用途的规格。 这些规范是将水从特定来源引入、处理以使其达到特定目的所需的质量水平，然后使其可用于该目的所必需的要求。 用途包括农业灌溉、生活用水供应（包括饮用水）、工业和商业用途以及地下水补给。
要求：你的团队需要使用米德湖来调查和了解更多关于干旱对水库的影响，并考虑将废水回收作为解决水资源短缺的方法。 在你开始调查之前，我们提供以下信息：
表1给出了垦务局2010年测算的米德湖高程、面积、容积关系[4]。
表 1: 米德湖不同海拔的面积和体积
米德湖体积。 米德湖中的水量是流入、流出和损失的函数。 科罗拉多河提供了超过 96% 的流入量、来自其他三个支流的额外水量和湖面的直接降水。 流出是通过释放水（例如通过大坝）和直接从湖中消耗而发生的。 损失通过蒸发发生。
米德湖水位。这两个问题数据文件提供了有关米德湖水位的信息，以高于平均海平面的英尺为单位。
根据你在第 2 部分中的模型和水位预测，讨论水位变化对未来用水需求的影响，并考虑废水的回收利用是否可以弥补所有或部分未来的短缺。
你们的（PDF格式）论文总页数不能超过 25 页并且应该包括：
附件：
词汇表：
高程：以高于平均海平面的英尺数表示的高度量度。
适合用途规范：建筑设计说明，表明设施（在这种情况下为特定类型的水处理设施）满足其特定预期用途的要求。
流入：进入水体的水。 平均海平面：海平面的平均水平，用作测量地球高度或深度的参考或基准水平。
流出：离开水体的水。
废水：来自家庭、企业、工业过程或雨水径流的受污染形式的水。 废水包括家庭用水，如淋浴、洗碗、洗衣，还有冲马桶。
Background：Lake Mead, a Colorado River reservoir on the Nevada-Arizona border, is the largest water reservoir in the United States (Figure 1). In the summer of 2021, Lake Mead registered its lowest level on record since its initial filling in the 1930s. Drought, fueled by climate change, along with increasing demand for water by the 25 million people Lake Mead serves, has shrunk this reservoir to approximately 36 percent of its full capacity. On August 16, 2021, the Bureau of Reclamation announced the first-ever water shortage declaration on the Colorado River[1], Initially, this Tier 1 water shortage declaration results in reduced water deliveries to the states of Arizona, Nevada, and New Mexico with agricultural communities being the first to feel the cuts.
As droughts around the world have been increasing, researchers continue to develop means to recycle water more efficiently and effectively. One method is to recycle wastewater that flows out of our sinks, toilets, and showers. You may think this is impossible (and perhaps disgusting), but this technology already exists and is improving. Under most current circumstances, this wastewater goes through several treatment processes prior to being released into local waterways. Figure 2 shows examples of water sources and use applications. A treatment facility uses various techniques to meet fit-for-purpose specifications. These specifications are the requirements necessary to bring water in from a particular source, treat itto get it to the quality level needed for a particular purpose, and then make it available for that purpose. Some purposes include agricultural irrigation, domestic water supply (to include drinking water), industrial and commercial use, and recharging groundwater.
Requirements：Your team decides to use Lake Mead to investigate and learn more about drought impact on water reservoirs, and to consider the recycling of wastewater as a solution to water shortages. As you begin your investigation, we provide the following information: The level of Lake Mead is measured by elevation of the water surface in feet abovemean sea level. The area of Lake Mead is measured in acres. The volume of water in Lake Mead is measured in acre-feet.
Table 1 shows the relationship of elevation, area, and volume of Lake Mead as calculated by the Bureau of Reclamation in 2010[4]
Table 1. Area and Volume of Lake Mead by Elevation Level
Lake Mead Volume. The amount of water in Lake Mead is a function of inflow, outflow, and loss. The Colorado River provides over 96% of the inflow with additional water coming from three other tributaries, as well as direct precipitation on the lake surface. Outflow occurs through releasing water (for example, through a dam) and consumption directly from the lake. Loss occurs through evaporation.
Lake Mead Water Level. The two problem data files provide information about Lake Mead water levels given by elevation in feet above mean sea level.
Based on your models and water level predictions in Part 2, address the impact on future water usage demands and consider if the recycling of wastewater could make up all or a part of any future shortfalls.
Write a one-page non-technical news article reporting the key takeaways and recommendations from your investigation.
Your PDF solution of no more than 25 total pages should include:
Note: The HiMCM Contest now has a 25-page limit. All aspects of your submission count toward the 25-page limit (Summary Sheet, Table of Contents, Reference List, and any Appendices).
Attachments：
Glossary：
Bureau of Reclamation: a government agency that manages, develops, and protects waterand related resources in the seventeen western states of the Unites States.
Elevation: a measure of height indicated by the number of feet above mean sea level.
Fit For Purpose Specifications: a description of construction design that indicates the facility (in this case a particular type of water treatment facility) meets the requirements for its specific intended use.
Inflow: the water entering a body of water. Mean Sea Level: an average level of the surface of the sea used as a reference or base level to measure height or depth on Earth.
Outflow: the water leaving a body of water.
Wastewater: the polluted form of water that comes from homes, businesses, industrial processes, or rainwater runoff. Wastewater includes water from household uses such as showering, dishwashing, laundry and, of course, flushing the toilet.