MapShed Model for the Christina Basin · Farm Animal Population • Used USGS in -stream monitoring...
Transcript of MapShed Model for the Christina Basin · Farm Animal Population • Used USGS in -stream monitoring...
VUSP Symposium October 14, 2015
Using MapShed Model for the Christina Basin TMDL Implementation and Water Quality Restoration Dani-Ella Betz Chester County Water Resources Authority Dr. Barry Evans Penn State University Stroud Water Research Center Appreciation for PA DEP funding and technical assistance
VILLANOVA
Delaware County
Lancaster County
State of Delaware
Montgomery County
Project Goals
Tool to assist with 2006 Christina Basin TMDL sediment, bacteria, nitrogen and phosphorus TMDL 565 sq. miles TMDL NOT watershed-wide
After a comparison of models, we chose MapShed. GIS-based watershed modeling tool Worked with Barry Evans to localize and calibrate
the MapShed model for the Christina Basin
• Chester County Enhanced Input Data: Land Use (1995 and 2010) Weather Water Extraction Septic Systems Farm Animal Population
• Used USGS in-stream monitoring stations to
calibrate Brandywine, Red Clay and White Clay
MapShed for Christina Basin
EPA TMDL Loading Rates – Sediment (TSS)
-
500
1,000
1,500
2,000
2,500
3,000
3,500
Bas
elin
e Lo
adin
g R
ate
(kg/
ha/y
r)
Christina Basin TMDL - HSPF Model Watersheds Baseline Sediment Loading Rates
Sediment Loading Rate
Attenuation
Wetlands, ponds, impoundments behind dams influence loading rates.
Reduces pollutant loads at watershed 0utlet, but hides influence of “hot spots” Source: Merritts, Franklin&Marshall College
Baseline Scenario: 1994- 1998 (TMDL developed) 2012 Current Scenario: 2010-2012 updated land cover that
revised loading rates incorporating land conversion and any known BMPs implemented state-compiled government data at county-level
MapShed for Christina Basin
Future Scenarios: What combinations of BMPs can achieve the TMDL percent reduction needed?
MapShed for Christina Basin
Results for Brandywine Modeled 15
Brandywine TMDL sub-basins that had WLA
Greatest source of pollutants in 2012 scenario
Future bmp implementation scenario
Source of Pollutants 2012 Land Use & BMPs
Municipal Reductions Required
Future BMP Implementation Scenario
Data inputs per basin
Future Scenario Results
Current Application
W. Goshen Township TMDL Strategy for Brandywine Creek and Chester (Goose) Creek Used MapShed baseline sediment loading Input existing detention basins Able to meet requirements with proposed suite
of bmps, including significant investment in stream restoration
Future Applications
Assist municipalities to determine future effort required to meet TMDL .
Potential tool to evaluate financial investment and decisions William Penn Foundation ‘s SWAT (Soil and Water
Assessment Tool) will be compared to MapShed.
Use of MapShed to track water quality
restoration progress watershed-wide.
For More Information
MapShed Model (NOT MapShed for the Christina Basin): http://www.mapshed.psu.edu/ Christina Basin MapShed: Contact Dani-Ella Betz at Chester County Water Resources Authority