水文和水质（H/WQ）模型由相互关联的数学方程组组成 代表控制水、沉积物、营养物、杀虫剂的运动、命运和运输的过程， 土壤中和土壤表面的细菌和其他成分，以及通过地下水、溪流、河流和 水库系统。可靠的模型为制定合理的管理、政策和法规提供了信息 决定。而校准、验证和评估（CV&E）对于确保模型的准确性和可靠性至关重要 精确地说，模型实践者如何进行和记录这一过程以及 传达结果。因此，本工程实践旨在促进良好的建模 改进H/WQ模型的建模方法和应用的实践建议 对性能进行建模，并加强对所用过程和结果与建模人员的沟通， 决策者和其他建模利益相关者。它以推荐的协议为基础，认识到正式模型开发、应用和维护的需要 沟通指南，而不是特别的方法，因为通常严重的人类健康、监管、， 建模应用的生态、社会经济和政策影响。这种工程实践并非如此 旨在作为一个全面的指南，而是从基础 贝克（1987年）、阿瑟（1993年）、哈恩等人（1995年）、雷夫斯加德等人（2005年）、杰克曼等人等手稿。 （2006年）、恩格尔等人（2007年）、莫里斯等人（2007年）、比昂迪等人（2012年）、贝内特等人（2013年）、里特和穆？奥兹- Carpena（2013）和Black等人（2014），以及最近的汇编中描述的进展（例如Mu？oz Carpena） 等人，2006年；Moriasi等人，2012年，2015a）。

Hydrologic and water quality (H/WQ) models consist of interrelated assemblages of mathematical equations that represent the processes governing the movement, fate, and transport of water, sediments, nutrients, pesticides, bacteria, and other constituents in and on the surface of the soil and through groundwater, stream, river, and reservoir systems. Reliable models provide information for making sound management, policy, and regulatory decisions. While calibration, validation, and evaluation (CV&E) are essential for ensuring model accuracy and precision, there is little consistency in how model practitioners conduct and document this process and communicate the results. Therefore, this Engineering Practice was designed to contribute to good modeling practice recommendations to improve modeling methodology and application of H/WQ models through improved model performance as well as enhanced communication of the processes utilized and results to modelers, decision-makers, and other modeling stakeholders.It builds on recommended protocols recognizing the need for formal model development, application, and communication guidelines rather than ad hoc approaches because of the often-serious human health, regulatory, ecological, socio-economic, and policy implications of modeling applications. This Engineering Practice is not meant to serve as a comprehensive guide but rather to compile and enhance guidance from foundational manuscripts such as Beck (1987), ASCE (1993), Haan et al. (1995), Refsgaard et al. (2005), Jakeman et al. (2006), Engel et al. (2007), Moriasi et al. (2007), Biondi et al. (2012), Bennett et al. (2013), Ritter and Mu?oz- Carpena (2013) and Black et al. (2014), and advances described in recent compilations (e.g., Mu?oz-Carpena et al., 2006; Moriasi et al., 2012, 2015a).