PTMAppPrioritize, Target, and Measure Application

Presented by:Drew Kessler – Houston Engineering

Coauthors:Mark Deutschman – Houston EngineeringChuck Fritz – International Water Institute

Scale of Work and WRAPS Translation

TMDL/WRAPS ‐Prioritize Water 

Quality

1W1P – Prioritize, Target, Measure

Implement & Continue Measuring

MPCA BWSR Local • SWCD• Counties• Cities• Local

Producers

Scale of Work Iowa

Nutrient Reduction Strategy

IDALS ‐WQI Implement & Continue Measuring

Local • SWCD• Counties• Cities• Local

Producers

Using technology for watershed planning across spatial scales?

Field 

Watershed & Regional 

State

Why was PTMApp Developed

• MN Clean Water Accountability Act

• One Watershed, One plan

Why PTMApp?

PTMAppCOMPONENTS

Create Products Using PTMApp–DESKTOP

▪ Free for download and use▪ ArcGIS Toolbar▪ Based planning data included▪ Creates products▪ Includes example uses

WHAT IS PTMApp?

Internet Access of Product Using 

PTMApp–WEB• Targeted Implementation Strategy• Grant Applications• One Watershed One Plan• Refine WRAPs

In Use

Fina

l Testin

g

PROJECT TEAM

PTMApp EVOLUTION

Funding▪ Clean Water Fund▪ Minnesota Board of Water & Soil Resources

▪ Red River Watershed Management Board

Project Team/Production▪ International Water Institute▪ Houston Engineering, Inc.

Prioritize, Target, and MeasureWHAT IS PTMApp?

DESCRIBE: Watershed Condition

EXAMPLE PRODUCTS AND USES

PRIORITIZE: Your Resource Concerns

EXAMPLE PRODUCTS AND USES

PRIORITIZE: Sources Delivering Largest Downstream Loads

EXAMPLE PRODUCTS AND USES

PRIORITIZE: Evaluate Practice Feasibility

EXAMPLE PRODUCTS AND USES

TARGET: Estimated Practice WQ Benefits

EXAMPLE PRODUCTS AND USES

Storage Filtration Bio-Filtration

Infiltration Protection Source Reduction

UserDefined

Treatment Process

Sedimentation Sedimentation Sedimentation & biological Volume abstraction  Reduction in Mass 

Leaving Landscape?Reduction of Mass 

Potential

User selects method (from those to left) or 

enters percentage

Form of Treated

Particulate Particulate Particulate Dissolved Total (Dissolved & Particulate)

Total (Dissolved & Particulate)

Total (Dissolved & Particulate)

Reduction Ratio Treatment Volume / Runoff Volume Delivered

Velocity Design Standard / Velocity During Peak Discharge

Velocity Design Standard / Velocity During Peak Discharge

BMP Abstraction Volume / Volume Delivered

Modified RUSLE Parameters

Actual reduction in mass

User selects method (from those to left) or enters percentage

WQBenefits

Delivery Potential(D)

Treatment Potential (T)

Peak Discharge, ft./sec..

Design Standard Velocity

0.05 ft./sec.

10yr 24hr Storm

Reduction Ratio(R = T/D)

R, %

< 53%53 – 75%75 – 90%> 90 %

High

Low

WQBenefits

Benefits Analysis

R = a * rK

R = reduction at BMP, %

a = maximum observed % reduction

r = reduction ratio, % (runoff delivered / treatment capacity)

K = weighted function of interquartile range =(Q3-Q2)/(Q2-Q1)

00.20.40.60.8

1

0 0.5 1

Red

uctio

n at

BM

P, %

Reduction Ratio, %

Treatment Decay Functions

K=1

k=0.43

k=2.33

Q3

Q2

Q1

K=0.43

Q3

Q2

Q1

K=1

Q3

Q2Q1

K=2.33

WQBenefits

Reduction RatioR, %

< 53%53 – 75%75 – 90%> 90 %

00.20.40.60.8

0 0.5 1

Sedi

men

t Red

uctio

n at

BM

P, %

Reduction, Ratio (R)

Treatment Decay Functions: Filtration

Q…

% Sediment Reduction

Sediment Reduction, %

<46%

47% - 60%

61% - 70%

> 70%

Benefits Analysis

WQBenefits

Accounting for ?

Benefits Analysis

0

0.2

0.4

0.6

0.8

1

0 0.2 0.4 0.6 0.8 1

Red

uctio

n at

BM

P, %

Treatment Ratio

Treatment Decay Functions: Filter Strips

Max

Q1

Q2

Q3

Min

Design Uncertainty Longevity/life span…?

WQBenefits

TARGET: Best Practice Locations (WQ Benefit Only)

EXAMPLE PRODUCTS AND USES

TARGET: Best Practice Locations (WQ , Profitability, Willing Participation)

EXAMPLE PRODUCTS AND USES

Willing Landowner

MEASURE: Benefits of  Targeted Implementation Plan 

EXAMPLE PRODUCTS AND USES

TreatmentTrains

TreatmentTrains

BMP LocationsFiltration

Filtration Watershed

Source Reduction

TreatmentTrains

TreatmentTrains

TreatmentTrains

Some Final ThoughtsNo tool is perfect. Define the problem, use the right tool.

PTMApp is for Water Quality Planning  

Practical Ideas

‐Climate Variation‐Altered Hydrology?

Also LULC changes..

24 hour events Benefits Analysis

0

0.2

0.4

0.6

0.8

1

1.2

0 0.5 1 1.5Re

duction at BMP, %

Reduction Ratio

Treatment Decay Functions: Filter Strips

Max

Q2

Min

2 year

10 year

10 inches

Practical Ideas

Altered Hydrology

Set Goals

“Measure” progress

Relate to Channel Stability

10 yr, 24 hr Qp< 74 cfs

75 - 304

305 - 614

615 - 931

> 931 cfs

Historic vs. Modern Qp

Difference in 10 year, 24 hourQp, cfs

< 1 cfs

2 - 5

6 - 10

11 - 25

26 - 50

51 - 100

> 100 cfs

Practical Ideas

Limitations 

• PTMApp – Desktop Processing Times• Spatial resolution of Land Use / Land Cover 

Data• Needs more validation in range of 

landscapes• Ignores existing practices unless “entered”• Species of TN and TP• Lacks near channel sediment• No hydrological routing 

Final Thoughts   

“Essentially, all models are wrong, but some are useful.”- George E.P. Box

Final Thoughts   

More Informationptmapp.rrbdin.org