A common feature of grading plan is the requirement that the engineer must adhere to the specified minimum and maximum slopes.
A common minimum slope for ground coverings such as lawns is one percent. This allows stormwater drainage. For safety reasons, a common maximum slope for grading design development is 25 percent. This means that there should be a one-foot vertical elevation difference over a four-foot horizontal distance change.
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A driveway's minimum and the maximum slope is one percent.
The plan might have labels for slopes that are proposed on it. These labels could be placed over specific areas or pointed to certain areas to make it clearer for someone who is using the plan.
A site grading plan can also include proposed spot grading.
Spot grades, also known as spot elevations, are points on a plan that have been marked with proposed elevations. These points can be used in areas that require additional grading details or clarification for the site contractor to determine where the proposed high and low points should be.
When designing a land development plan, civil engineers have a common goal: to create a site-grading design that balances.
Sites that balance are those that have a proposed site grade design that has earth cut that is equal to the earth fill amount. Sites that are balanced would not require extra earth to be removed from the site or imported into it.