Storage Volume vs Depth Equation in SWMM 5

Subject:  Storage Volume vs Depth Equation in SWMM 5

A storage node in SWMM 5 can have either a functional form or a tabular depth/area table.  The area functional form of a storage node is:

Area           =      A * Depth^B + C  and the Volume has the form in  node.c of the SWMM 5 of

Volume     =      A/(B+1)*Depth^(1+B) + C*Depth

For example if C is 25 square meters, A is 20 and the exponent B is 0.5 we get the following values for area and volume and you can also plot a Scatter Plot of Volume vs Depth in SWMM 5 (Figure 1).

Depth
Area
Volume
Meters
M^2
M^3
0
25.00
0.00
1
45.00
38.33
2
78.28
87.71
3
109.64
144.28
4
140.00
206.67
5
169.72
274.07
6
198.99
345.96
7
227.92
421.94
8
256.57
501.70
9
285.00
585.00
10
313.25
671.64
11
341.33
761.44
12
369.28
854.26

Table 1.  Area and Volume for a Storage Node in SWMM 5.
Figure 1.  You can use a Scatter Graph in SWMM 5 to show the relationship between Volume and Depth.



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