A series of locks enable river vessels to "step" up or down a river or canal from one water level to another. The boats continue into the next lock, and so on, until they reach the end of the dam and lock system.
Boats and ships get through a waterway by going into a lock, which is a big chamber in the water with moveable gates at each end, then waiting as a valve is opened and the water from that lock flows into the next lock (or next body of water if just one lock), raising or lowering the boat automatically. What about the Mississippi River? Did you know that both of these major water transportation routes-and many others!-use a special type of dam system to help boats, ships and barges move from one section of water to another when they are at various water levels? It's called a dam and lock system. Raise your hand if you've heard of the Panama Canal. Specification of constraints includes consideration of scientific principles and other relevant knowledge that is likely to limit possible solutions.Īll human activity draws on natural resources and has both short and long-term consequences, positive as well as negative, for the health of people and the natural environment.Īlignment agreement: Thanks for your feedback! The uses of technologies and any limitations on their use are driven by individual or societal needs, desires, and values by the findings of scientific research and by differences in such factors as climate, natural resources, and economic conditions.ĭam and Lock Visual Aid (pdf) Visit [ to print or download. The more precisely a design task's criteria and constraints can be defined, the more likely it is that the designed solution will be successful. This lesson focuses on the following Three Dimensional Learning aspects of NGSS:ĭefine a design problem that can be solved through the development of an object, tool, process or system and includes multiple criteria and constraints, including scientific knowledge that may limit possible solutions.Īlignment agreement: Thanks for your feedback! Define the criteria and constraints of a design problem with sufficient precision to ensure a successful solution, taking into account relevant scientific principles and potential impacts on people and the natural environment that may limit possible solutions.Ĭlick to view other curriculum aligned to this Performance Expectation
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