Version 1.09 July 12, 2012
***BETA***
WHAT'S YOUR P?
Adapted from the NH Residential Loading Model spreadsheet available from NH Department of Environmental Services
Step 1: Enter your site conditions

First, you'll enter basic information about your property. Please provide estimates of annual average rainfall, land uses, and fertilizer usage for the existing condition (before land use changes) and a planned condition (after land use changes). All of the inputs should be populated even if many of the values are (0). Your site information submitted here will automatically carry forward to next steps. Click the buttons to get help with the model, or download the printable instructions.

TIP: Use the context-sensitive calculators to assist with filling in each item.

1. Find your sub-watershed
In which sub-watershed is your property located?   Open the map tool to select your sub-watershed
Optional - Enter and search for your street address:
 
2. Enter your rainfall
What's your annual rainfall? inches
3. Define your property land uses EXISTING land use PLANNED land use     copy from existing
How much is forest or natural? ft2 acres ft2 acres
How much is lawn / landscape? ft2 acres ft2 acres
How much is impervious roof? ft2 acres ft2 acres
How much is other hard surfaces? ft2 acres ft2 acres
Total:       ft2 acres       ft2 acres
4. Enter your fertilizer use EXISTING land use PLANNED land use     copy from existing
Phosphorus fertilizer use: lbs/acre/year lbs/acre/year
Nitrogen fertilizer use: lbs/acre/year lbs/acre/year
Results of Step 1:

The following is an initial result showing your existing load without considering any storm water treatments. In step 2 you will enter any existing stormwater treatments, and in step 3 you will enter planned stormwater treatments.

Nutrient Runoff Concentration EXISTING land use PLANNED land use
TSS Event Mean Concentration: mg/L mg/L
Phosphorus Event Mean Concentration: mg/L mg/L
Nitrogen Event Mean Concentration: mg/L mg/L
Runoff Volume EXISTING land use EXISTING land use
With SW Treatment
PLANNED land use PLANNED land use
With SW Treatment
Treatable Stormwater Runoff Volume: ft3/year ft3/year ft3/year ft3/year
Nutrient Runoff Mass EXISTING land use EXISTING land use
With SW Treatment
PLANNED land use PLANNED land use
With SW Treatment
Total Suspended Solids (TSS) Footprint: lbs/year lbs/year lbs/year lbs/year
Phosphorus Footprint: lbs/year lbs/year lbs/year lbs/year
Nitrogen Footprint: lbs/year lbs/year lbs/year lbs/year

What's your P? application developed by GreenInfo Network and Applied Geographics, in partnership with the Lake Winnipesaukee Watershed Association and NH Department of Environmental Services.

Step 2: Do you have existing stormwater treatment(s) in place?

Here you will enter Stormwater Treatment practices that are currently in place on the property. If there are no existing Stormwater treatment practices, skip to step 3 to enter planned practices. Please note that some inputs on this page may be left blank because in many cases, there may be no treatment practices in place for that type of land use.

Before you begin this step, you will need to determine the following:

Please refer to the Diagrams providing Examples of SW Treatment Sets and Downstream Treatment for an explanation of how to determine sets and downstream treatments.

Click here for more detailed instructions.

Do you have any stormwater treatment practices in place already?

RESOURCES
Set One show intermediate math Forest Lawn / Landscape Impervious Roof Other Hard Surfaces
Square feet of land use
Acres of land use
Stormwater Treatment Practice applied  
Square feet of land use draining to practice  
Acres of land use draining to practice  
Runoff Reduction Efficiency (%)  
Total Suspended Solids Reduction Efficiency (%)  
Phosphorus Reduction Efficiency (%)  
Nitrogen Reduction Efficiency (%)  
Runoff Reduction (Cubic feet/year)  
TSS Reduction (lbs/year)  
TP Reduction (lbs/year)  
TN Reduction (lbs/year)  
Runoff Remaining for practice in Series (cubic feet/year)  
TSS Remaining for practice in Series (lbs/year)  
TP Remaining for practice in Series (lbs/year)  
TN Remaining for practice in Series (lbs/year)  
Is there a second treatment practice applied downstream?  
Runoff Reduction Efficiency (%)  
Total Suspended Solids Reduction Efficiency (%)  
Phosphorus Reduction Efficiency (%)  
Nitrogen Reduction Efficiency (%)  
Runoff Reduction (Cubic feet/year)  
TSS Reduction (lbs/year)  
TP Reduction (lbs/year)  
TN Reduction (lbs/year)  
SET ONE TOTAL Runoff Reduction (Cubic feet/year)  
SET ONE TOTAL TSS Reduction (lbs/year)  
SET ONE TOTAL TP Reduction (lbs/year)  
SET ONE TOTAL TN Reduction (lbs/year)  
 
Set Two show intermediate math 1. Forest 2. Lawn / Landscape 3. Impervious Roof 4. Other Hard Surfaces
Square feet of land use
Acres of land use
Stormwater Treatment Practice applied  
Square feet of land use draining to practice  
Acres of land use draining to practice  
Runoff Reduction Efficiency (%)  
Total Suspended Solids Reduction Efficiency (%)  
Phosphorus Reduction Efficiency (%)  
Nitrogen Reduction Efficiency (%)  
Runoff Reduction (Cubic feet/year)  
TSS Reduction (lbs/year)  
TP Reduction (lbs/year)  
TN Reduction (lbs/year)  
Runoff Remaining for practice in Series (cubic feet/year)  
TSS Remaining for practice in Series (lbs/year)  
TP Remaining for practice in Series (lbs/year)  
TN Remaining for practice in Series (lbs/year)  
Is there a second treatment practice applied downstream?  
Runoff Reduction Efficiency (%)  
Total Suspended Solids Reduction Efficiency (%)  
Phosphorus Reduction Efficiency (%)  
Nitrogen Reduction Efficiency (%)  
Runoff Reduction (Cubic feet/year)  
TSS Reduction (lbs/year)  
TP Reduction (lbs/year)  
TN Reduction (lbs/year)  
SET TWO TOTAL Runoff Reduction (Cubic feet/year)  
SET TWO TOTAL TSS Reduction (lbs/year)  
SET TWO TOTAL TP Reduction (lbs/year)  
SET TWO TOTAL TN Reduction (lbs/year)  
 
Set Three show intermediate math 1. Forest 2. Lawn / Landscape 3. Impervious Roof 4. Other Hard Surfaces
Square feet of land use
Acres of land use
Stormwater Treatment Practice applied  
Square feet of land use draining to practice  
Acres of land use draining to practice  
Runoff Reduction Efficiency (%)  
Total Suspended Solids Reduction Efficiency (%)  
Phosphorus Reduction Efficiency (%)  
Nitrogen Reduction Efficiency (%)  
Runoff Reduction (Cubic feet/year)  
TSS Reduction (lbs/year)  
TP Reduction (lbs/year)  
TN Reduction (lbs/year)  
Runoff Remaining for practice in Series (cubic feet/year)  
TSS Remaining for practice in Series (lbs/year)  
TP Remaining for practice in Series (lbs/year)  
TN Remaining for practice in Series (lbs/year)  
Is there a second treatment practice applied downstream?  
Runoff Reduction Efficiency (%)  
Total Suspended Solids Reduction Efficiency (%)  
Phosphorus Reduction Efficiency (%)  
Nitrogen Reduction Efficiency (%)  
Runoff Reduction (Cubic feet/year)  
TSS Reduction (lbs/year)  
TP Reduction (lbs/year)  
TN Reduction (lbs/year)  
SET THREE TOTAL Runoff Reduction (Cubic feet/year)  
SET THREE TOTAL TSS Reduction (lbs/year)  
SET THREE TOTAL TP Reduction (lbs/year)  
SET THREE TOTAL TN Reduction (lbs/year)  
TOTAL 1. Forest 2. Lawn / Landscape 3. Impervious Roof 4. Other Hard Surfaces ALL LAND COVERS
REMOVAL TOTAL Runoff Reduction (Cubic feet/year)  
REMOVAL TOTAL TSS Reduction (lbs/year)  
REMOVAL TOTAL TP Reduction (lbs/year)  
REMOVAL TOTAL TN Reduction (lbs/year)  

What's your P? application developed by GreenInfo Network and Applied Geographics, in partnership with the Lake Winnipesaukee Watershed Association and NH Department of Environmental Services.

Step 3: Planned SW Treatment

In this step you will be entering planned stormwater treatments. If you have existing stormwater treatment (step 2) and are proposing additional future stormwater treatment, you must first "copy existing treatments" or re-enter the existing stormwater treatment in addition to the planned treatments in this step.

These planned treatments will be calculated using the planned site conditions, as entered in the 2nd column in step 1. Please be sure this "PLANNED" column is populated on the site conditions page in order for the planned stormwater treatments to be properly calculated (use "copy from existing" in step 1 if you have no planned land use changes).

Click here for more detailed instructions.

Do you plan to install any stormwater treatment?

RESOURCES
Set One show intermediate math
copy existing treatments
Forest Lawn / Landscape Impervious Roof Other Hard Surfaces
Square feet of land use
Acres of land use
Stormwater Treatment Practice applied  
Square feet of land use draining to practice  
Acres of land use draining to practice  
Runoff Reduction Efficiency (%)  
Total Suspended Solids Reduction Efficiency (%)  
Phosphorus Reduction Efficiency (%)  
Nitrogen Reduction Efficiency (%)  
Runoff Reduction (Cubic feet/year)  
TSS Reduction (lbs/year)  
TP Reduction (lbs/year)  
TN Reduction (lbs/year)  
Runoff Remaining for practice in Series (cubic feet/year)  
TSS Remaining for practice in Series (lbs/year)  
TP Remaining for practice in Series (lbs/year)  
TN Remaining for practice in Series (lbs/year)  
Is there a second treatment practice applied downstream?  
Runoff Reduction Efficiency (%)  
Total Suspended Solids Reduction Efficiency (%)  
Phosphorus Reduction Efficiency (%)  
Nitrogen Reduction Efficiency (%)  
Runoff Reduction (Cubic feet/year)  
TSS Reduction (lbs/year)  
TP Reduction (lbs/year)  
TN Reduction (lbs/year)  
SET ONE TOTAL Runoff Reduction (Cubic feet/year)  
SET ONE TOTAL TSS Reduction (lbs/year)  
SET ONE TOTAL TP Reduction (lbs/year)  
SET ONE TOTAL TN Reduction (lbs/year)  
 
Set Two show intermediate math Forest Lawn / Landscape Impervious Roof Other Hard Surfaces
Square feet of land use
Acres of land use
Stormwater Treatment Practice applied  
Square feet of land use draining to practice  
Acres of land use draining to practice  
Runoff Reduction Efficiency (%)  
Total Suspended Solids Reduction Efficiency (%)  
Phosphorus Reduction Efficiency (%)  
Nitrogen Reduction Efficiency (%)  
Runoff Reduction (Cubic feet/year)  
TSS Reduction (lbs/year)  
TP Reduction (lbs/year)  
TN Reduction (lbs/year)  
Runoff Remaining for practice in Series (cubic feet/year)  
TSS Remaining for practice in Series (lbs/year)  
TP Remaining for practice in Series (lbs/year)  
TN Remaining for practice in Series (lbs/year)  
Is there a second treatment practice applied downstream?  
Runoff Reduction Efficiency (%)  
Total Suspended Solids Reduction Efficiency (%)  
Phosphorus Reduction Efficiency (%)  
Nitrogen Reduction Efficiency (%)  
Runoff Reduction (Cubic feet/year)  
TSS Reduction (lbs/year)  
TP Reduction (lbs/year)  
TN Reduction (lbs/year)  
SET TWO TOTAL Runoff Reduction (Cubic feet/year)  
SET TWO TOTAL TSS Reduction (lbs/year)  
SET TWO TOTAL TP Reduction (lbs/year)  
SET TWO TOTAL TN Reduction (lbs/year)  
 
Set Three show intermediate math Forest Lawn / Landscape Impervious Roof Other Hard Surfaces
Square feet of land use
Acres of land use
Stormwater Treatment Practice applied  
Square feet of land use draining to practice  
Acres of land use draining to practice  
Runoff Reduction Efficiency (%)  
Total Suspended Solids Reduction Efficiency (%)  
Phosphorus Reduction Efficiency (%)  
Nitrogen Reduction Efficiency (%)  
Runoff Reduction (Cubic feet/year)  
TSS Reduction (lbs/year)  
TP Reduction (lbs/year)  
TN Reduction (lbs/year)  
Runoff Remaining for practice in Series (cubic feet/year)  
TSS Remaining for practice in Series (lbs/year)  
TP Remaining for practice in Series (lbs/year)  
TN Remaining for practice in Series (lbs/year)  
Is there a second treatment practice applied downstream?  
Runoff Reduction Efficiency (%)  
Total Suspended Solids Reduction Efficiency (%)  
Phosphorus Reduction Efficiency (%)  
Nitrogen Reduction Efficiency (%)  
Runoff Reduction (Cubic feet/year)  
TSS Reduction (lbs/year)  
TP Reduction (lbs/year)  
TN Reduction (lbs/year)  
SET THREE TOTAL Runoff Reduction (Cubic feet/year)  
SET THREE TOTAL TSS Reduction (lbs/year)  
SET THREE TOTAL TP Reduction (lbs/year)  
SET THREE TOTAL TN Reduction (lbs/year)  
TOTAL Forest Lawn / Landscape Impervious Roof Other Hard Surfaces ALL LAND COVERS
REMOVAL TOTAL Runoff Reduction (Cubic feet/year)  
REMOVAL TOTAL TSS Reduction (lbs/year)  
REMOVAL TOTAL TP Reduction (lbs/year)  
REMOVAL TOTAL TN Reduction (lbs/year)  

What's your P? application developed by GreenInfo Network and Applied Geographics, in partnership with the Lake Winnipesaukee Watershed Association and NH Department of Environmental Services.

Step 4: Goals Summary

This page provides the existing versus planned land use conditions runoff volumes and nutrient footprints with the stormwater treatment practices you entered in steps 2 and 3. Three scenario options are provided. NOTE: You can model all of the parameters (runoff volume, total suspended solids, phosphorus, and nitrogen) using the same option, or you can model a different option for each parameter.

RUNOFF VOLUME Comparison & Goal EXISTING LAND USE CONDITIONS
(includes treatment practices if in place)
Results PLANNED LAND USE CONDITIONS
(includes BMPs if in place)
PLANNED LAND USE CONDITIONS
(includes BMPs if in place)
BEST STORMWATER FOOTPRINT FOR YOUR PROPERTY

This is the annual treatable volume of stormwater runoff from your property.

• For the existing condition, it is the volume of runoff from the un-developed portion that is to be developed and any existing developed portions of the lot.

• For the planned condition it is the runoff from the developed portion of the lot.

Target reduction:
%
Target footprint:
cubic feet/acre/year

cubic feet/year

cubic feet/year

cubic feet/acre/year

cubic feet/acre/year
RUNOFF NUTRIENT MASS Comparison & Goal EXISTING LAND USE CONDITIONS
(includes treatment practices if in place)
Results PLANNED LAND USE CONDITIONS
(includes BMPs if in place)
PLANNED LAND USE CONDITIONS
(includes BMPs if in place)
BEST STORMWATER FOOTPRINT FOR YOUR PROPERTY

Total Suspended Solids (TSS) Footprint

This is the annual mass of Total Suspended Solids (TSS) in stormwater runoff for your property.

Target reduction:
%
Target footprint:
lbs/acre/year

lbs/year

lbs/year

lbs/acre/year

lbs/acre/year

Phosphorus Footprint

This is the annual mass of phosphorus in stormwater runoff for your property.

Target reduction:
%
Target footprint:
lbs/acre/year

lbs/year

lbs/year

lbs/acre/year

lbs/acre/year

Nitrogen Footprint

This is the annual mass of nitrogen in stormwater runoff for your property.

Target reduction:
%
Target footprint:
lbs/acre/year

lbs/year

lbs/year

lbs/acre/year

lbs/acre/year

You're finished!  Click below to print your report.  Thank you for your efforts to improve water quality in our community.

What's your P? application developed by GreenInfo Network and Applied Geographics, in partnership with the Lake Winnipesaukee Watershed Association and NH Department of Environmental Services.