As everyone knows, all living organisms require water of sufficient quantity and quality to survive. What uses depend on water quality? Almost all one can identify. Water management measures are actions taken to ensure that the total pollutant loads discharged into receiving water bodies do not exceed the waste assimilative capacity of those water bodies and that the quality meets the quality standards set for those waters. If the quality of water drops to the extent that other uses are adversely impacted, the assimilative capacities of those water bodies have been exceeded with respect to those impacted uses. As natural water bodies transport and assimilate wastes, their quality changes. One of them is the transport and assimilation of many waterborne wastes. Natural water bodies are able to serve many uses. Conflicts among various users of water are increasingly over issues involving water quality. Increasingly the major efforts and costs involved in water management are aimed at water quality protection and management. Many of these are discharged into surface and ground water bodies. As populations and economies grow, more wastewater pollutants are generated. When these levels are not met, water users must then either pay for water treatment or incur increased risks of using lower quality water. Most users of water depend on adequate levels of water quality. Water quality management is a critical component of overall integrated water resources management. This chapter introduces some approaches to water quality modeling, leaving descriptions of more advanced methods to textbooks devoted solely to this subject. Various models can assist in predicting the water quality impacts of alternative land and water management policies and practices. Water resources management involves the monitoring and management of water quality as much as the monitoring and management of water quantity. Runoff from agricultural and urban lands containing excess nutrients, oils, and solid wastes together with direct point source discharges of wastewaters into water bodies degrades the quality of those water bodies. At the same time watersheds and their water bodies serve as convenient sinks for domestic, industrial, and agricultural wastes. The quality of the water in nature also impacts the condition of all living organisms found in aquatic ecosystems that we depend upon for our own wellbeing. The quality of the water used to meet these needs must pose no risk to human health. Rainwater retention / Attenuation tanks / In-situ retention (O.S.The most fundamental human needs for water are for drinking, cooking, and personal hygiene.This system was designed to collect surface water through an infiltration system that cleans and filters the collected water before it is used to recharge the aquifers and groundwater levels and at the same time, provides moisture to the vegetation that It is located around the tank. This alternative for the storage and sustainable management of water becomes a very dynamic and profitable system through which it is possible to obtain high storage and buffer capacities. When the outer surface of the tank is wrapped with PVC or Polyethylene membranes, watertight underground volumes are created that store water to be used later in irrigation, commercial, residential or industrial reuse, or even in fire fighting networks. This modular system allows the construction of water reservoirs of unlimited capacity, in multiple shapes and depths, in order to adjust to the demands of the terrain and geometry of the project. Flo-Tank® - Modular Underground Tank SystemĪtlantis Flo-Tank® is a lightweight modular tank structural system designed to cleanly capture rainwater at the source and release it in a controlled manner according to soil permeability levels.