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Use of ArcGIS 8.1 for Land Development Planning on Small Acreage Sites

Use of ArcGIS 8.1 for Land Development Planning on Small Acreage Sites. Tim Osting CE 394K.3 GISWR Fall 2001. Small Sites – Background . I would like to explore the possibility of applying GIS technology to a typical Land Development project

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Use of ArcGIS 8.1 for Land Development Planning on Small Acreage Sites

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  1. Use of ArcGIS 8.1 for Land Development Planning on Small Acreage Sites Tim Osting CE 394K.3 GISWR Fall 2001

  2. Small Sites – Background • I would like to explore the possibility of applying GIS technology to a typical Land Development project • I would like to determine if existing GIS resources have adequate resolution for a typical small-acreage project (<100 acres)

  3. Small Sites – Overview OBJECTIVE: Produce a PROJECT FEASIBILITY STUDY using readily-available GIS data without leaving my desk! • Review General Development Planning Requirements • Description of traditional methodology • Description of GIS methodology • Comparison of methods

  4. Small Sites – A Typical Project • Location Map • Property Boundary Map • Drainage Area Map • Existing and Proposed Runoff Calculations • Floodplain Map • Area Geology • Area Wells

  5. Traditional Methods Location Map from TxDOT CAD files Property Boundaries from plat (corners generated from ground and record information) Digitized Geologic Map from draft UT-BEG 7.5 quads Soils Map from UT-BEG Wells GIS-based Methods Location Map from TxDOT CAD files Property Boundaries from same GIS Geologic Map from USGS GIS Soils Map from SSURGO/TNRIS GIS Wells from TWDB Small Sites – Data Sources

  6. Traditional Methods Drainage Area digitized from 7.5 degree topo map Rainfall/Runoff: HEC-1 or HEC-HMS Tc (or Tlag) Drainage Area CN Channel: HEC-RAS Floodplain Map GIS-based Methods NED-generated Drainage Area Or…Rainfall/Runoff: HEC-GeoHMS Tc (or Tlag) Drainage Area CN Channel: HEC-RAS Floodplain Map not available Small Sites – Drainage Calculations

  7. Small Sites – Sample Project • 2.6-acre residential resubdivision • Located in ETJ near Hutto, TX, portions in both Williamson and Travis Counties • Large up-gradient drainage area • Existing drainage channel at front of lot

  8. Small Sites – Digitized Drainage Map Site Drainage Area

  9. Small Sites – Drainage Map by GIS Site Drainage Area GIS Stream Network

  10. Small Sites – Tentative Conclusions • GIS speeds up data gathering process (Goal: Feasibility Study in 8 hours or less, <$600) HOWEVER, USE CAUTION! • Most development occurs in areas that are changing, so GIS data is often out of date • GIS data does not yet possess adequate resolution for a small-acreage site

  11. Small Sites – Tentative Conclusions • GIS is well-suited for producing a Preliminary Project Feasibility Study for a small-acreage site (Drainage Areas <250 acres) • Current GIS is not well-suited to provide final design data • Supplemental information is required for final project design

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