Tree Calculations
Calculating Diameter Breast Height
DBH is the standard used to measure the size of a tree and is 54 inches above ground.
How to Measure your Tree:
- Use a soft measuring tape. Wrap it around each branch at 54 inches (4.5 feet) to find the circumference of each one.
- Write down the circumference for each branch so you can use it for the below calculations.
- For each branch, enter the circumference into Calculator 1 below to find the DBH of the branch.
- Write down the DBH for each branch so you can enter them into Calculator 2.
- Enter the DBH of each branch into Calculator 2 below to find the equivalent DBH of the tree.
Allowable Tree Removal
Sammamish Municipal Code 21.03.060 provides the following removal standards for significant trees.
|
Annual Number |
Cumulative Number Over |
|
Less than 1/4 acre |
50% |
2 |
6 |
1/4 - 1/2 acre |
40% |
4 |
12 |
1/2 - 1 acre |
30% |
6 |
18 |
1-2 acres |
20% |
8 |
24 |
More than 2 acres |
10% |
10 |
30 |
* The number of significant trees allowed for removal is limited to whichever of these columns is lowest |