aquifer (confined)--soil or rock below the land surface that is saturated with water. There are layers of impermeable material both above and below it and it is under pressure so that when the aquifer is penetrated by a well, the water will rise above the top of the aquifer.
All manufacturers wish that their product or products are used on construction projects; otherwise, they would not be in the business. But, on the design side, not every product is suitable for a given project, nor is there sufficient fee to research every product that could potentially be used on a project.Convenienceâ refers to conditions that benefit the contractor, the owner, or both. If permitted, the contractor may submit a substitution request if there is a significant advantage, such as lower cost in labor, material, or both; quicker delivery time; or other benefit to the owner.
Math definition of Substitution: Substitution - A strategy for solving systems of equations that include solving for one variable and using that solution to find the other variable. 1  Subject : Math.  Topic : Algebra 2.