SCENARIO TOOL Lake Champlain Basin TMDL Lake Champlain Phosphorus - - PowerPoint PPT Presentation
SCENARIO TOOL Lake Champlain Basin TMDL Lake Champlain Phosphorus Water ershed ed In-lake ke How is phosphorus loading distributed in watershed? Monitoring data Soil and Water Assessment: SWAT In lake USDA ARS
Lake Champlain Basin TMDL
■ Monitoring data – In lake ■ Lake segments – Water column – Sediment – In flows ■ River Basin (VT and NY) ■ How is phosphorus loading distributed in watershed? ■ Soil and Water Assessment: SWAT – USDA ARS and Texas A & M – Used to predict parameter fate and transport: ■ Climate ■ Hydrology ■ Landscape characteristics and processes – Technical documentation 600+ pages
In-lake ke Water ershed ed
■ 30 year time series of estimated P loading ■ Calibrated/Validated on empirical P data ■ Output at approximately HUC 12 scale
■ Goal: BMP scenario that achieves TMDL based on SWAT loading estimates ■ Specifies which BMPs go on what land ‘type’ ■ Land ‘type’ = SWAT land use, slope class, and hydrologic soil group ■ Estimates P-loading rate, BMP efficiency, P-reduction, etc. ■ Described at BASIN scale ■ Exhaustive; in some cases, 100% of land ‘type’ requires BMP; in other cases, <100% BMP implementation is indicated
Select D Drain ainage Ar Area
Selec ect t Land nduse Type
Selec ect t HSG HSG
Selec ect t Slo lope Ar Area ( a (ha) a) TP TP Load ( d (kg/yr yr) Mississquoi River Corn-hay rotation on non- clayey soils A All 1800.79 853.18 Mississquoi River Continuous hay B All 45.75 16.58
elect BMP T Type pe BMP P Efficiency (%)
Enter Appl pplied Ar Area ( a (%) TP L TP Load d Reducti tion (kg/ g/yr yr) Cover Crop - Conservation Tillage - Grassed Waterways - Ditch Buffer - Riparian Buffer 0.89 1.00 763.03 Riparian Buffer 0.41 0.80 5.44
■ Starting point for potential BMP placement ■ Modeled estimate of P-loading, potential reduction; consistent framework ■ Watershed Management Tool (WMT): Will provide map interface that will summarize loadings, potential reductions, and possible BMPs by township, NHD+ catchment,
■ Inclusion of Tactical Basin Plan (TBP) implementation tables
COMID ID 234735 Drai ainag age A Area Lamoille River Landuse Continuous hay HSG SG D Slope All Total Ca Catchment A Area ( (ha) 5 Basin A Area ( (ha) 2590.65 Basin TP TP L Load ( (kg/yr) 2595.44 TP Rate k kg/ g/yr yr * *ha 1.00 BMP T Type ype Riparian Buffer BMP MP E Efficiency ( (%) 0.41 Basin T TP L Load R Reduction
(kg/y /yr) 851.30 Catchment T TP Load R Reduction
(kg/yr) 2.05