| P8 Mass Balance Terms |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Term |
Name |
|
|
|
|
Description |
|
|
|
|
|
|
|
| 1 |
Inflows from Watershed |
|
sum of all tributary watersheds |
|
|
|
|
| 2 |
Inflows
from Upstream Devices |
sum of outflows from all
upstream devices |
|
|
| 3 |
Infiltration |
|
|
|
|
outflow passing through bottom/sides of device |
|
| 4 |
Exfiltration |
|
|
|
|
net
outflow to groundwater |
|
= term 3 - term 5 |
|
| 5 |
Filtration Removal |
|
|
particle
mass removed during infiltration (trapped in soil) |
| 6 |
Normal Outflow |
|
|
|
controlled by
hydraulic properties of outlet or swale |
|
| 7 |
Spillway / Overflow |
|
|
occurs at max
elevation, controlled by water budget |
| 8 |
Sedimentation /
Decay |
|
settling
or other removal mechanisms |
|
|
|
| 9 |
Total Inflow |
|
|
|
sum of inflows |
|
|
|
= term 1 + 2 |
|
| 10 |
Surface Outflow |
|
|
|
normal + spillway |
|
|
= term 6 + 7 |
|
| 11 |
Groundwater Outflow |
|
|
net outflow to groundwater |
|
= term 4 |
|
|
| 12 |
Total Outflow |
|
|
|
surface + groundwater |
|
|
= term 10 + 11 |
|
| 13 |
Total Trapped |
|
|
|
filtration + sedimentation |
|
= term 5 + 8 |
|
| 14 |
Storage Increase |
|
|
change in mass
stored within device during time step |
| 15 |
Mass Balance Check |
|
|
net mass balance error |
|
= term 9 - 12
- 15 - 14 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|