Land Use and Urban Recharge in the Brushy Creek Watershed

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Presentation transcript:

Land Use and Urban Recharge in the Brushy Creek Watershed Jonathan Snatic

Urban Recharge Impervious cover, storm sewers…

Urban Recharge Infiltration of excess irrigation Leaking water mains and sewers Infiltration of excess irrigation Leaking pipes, sewers, and infiltration of excess irrigation

Brushy Creek Basin World map with flowlines, rapid urbanization over the last 20 years, Cp & L water from LCRA

Land Use 1992

Land Use 2001

Contributing Zone to monitor and potentially manage the effects of urban development in the contributing and recharge zones of the Edwards aquifer

LCRA- municipal supply

Llano Uplift

Llano Uplift Pedernales River Llano River

(87Sr/86Sr)MIX = (87Sr/86Sr)A ( fA) (SrA/ SrM) + (87Sr/86Sr)B (1-fA) (SrB/SrA)

Brushy Creek Basin Lake Creek Mason Creek

Can determine the urban recharge component to base flow in the Brushy Creek Basin. Sampling 2 component mixing model Is there a correlation between urban recharge and land use in the sampled watersheds? Delineate sampled watersheds Compare land use in watersheds Sample streams at base flow, determine amount of urban water, correlation with land use

30m DEM

NHD Flowlines

Flow Accumulation

World Map

Sample Locations- Point Delineation

Watersheds

Land Use

Urban vs. Rural Land Use Urban Rural 100- Single Family Res. 300- Commercial 400- Office 530- Misc. Industrial 900- Undeveloped 160- Large Lot Single Family 910- Agricultural 710- Parks

% urban area for each watershed.

Questions?