Using P8 to calculate load reduction and WLA reporting terms
Link to this table
| Reporting term | Infiltration/sedimentation BMPs | Filtration BMPs |
|---|---|---|
| Pollutant Removal and Outflow Concentration Calculations | ||
| Applicable P8 Removal Terms | (03) Infiltration; (08) Sedimentation + Decay | (05) Filtration Removal; (08) Sedimentation + Decay |
| Pollutant removal | (09) Total Inflow - (10) Surface Outflow | (09) Total Inflow -(12) Total Outflow |
| Outflow Loading** (for outflow concentration summary) | Surface outflow | Total outflow |
| Watershed and Areal Loading Calculations | ||
| Directly contributing watershed area to a device (acres) | Sum of all watersheds routing directly to BMP device | |
| Cumulative contributing watershed area to a device (acres) | Directly contributing watershed area + Directly contributing watershed area of all upstream devices | |
| Watershed pollutant areal loading at device (pre-treatment) (lbs/acre/year) | [(01) Watershed Inflow (lbs)] / [Directly Contributing Watershed Area (acres)] / [Simulation Duration (years)] | |
| Pollutant areal loading from device (post-treatment) (lbs/acre/year) | [Outflow Loading** (lbs)] / [Cumulative Contributing Watershed Area (acres)] / [Simulation Duration (years)] | |
| Watershed pollutant areal loading model wide (pre-treatment) (lbs/acre/year) | [Sum of (01) Watershed Inflow at all devices (lbs)] / [Total Model Watershed Area (acres)] / [Simulation Duration (years)] | |
| Model Wide Outflow*** (lbs) | [Sum of (01) Watershed Inflow at all devices (lbs)] - [Sum of (Pollutant Removal*) at all devices (lbs)] | |
| Pollutant areal loading model wide (post-treatment) (lbs/acre/year) | [Model Wide Outflow*** (lbs)] / [Total Model Watershed Area (acres)] / [Simulation Duration (years)] | |