FLOOD08422

• Designation Number: 27
• County: El Paso
• Community: Colorado Springs
• Stream Name: Sand Creek
• Basin: Arkansas
• Title: Flood Hazard Analysis - Sand Creek, Colorado Springs, El Paso County
• Date: 7/1/1973
• Designation Date: 10/1/1973
• Floodplain - Doc Type: Floodplain Report/Masterplan

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SOURCES Or VATA A~'D TECHNICAL STliV!ES

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Base ~aps were developed from U.S. Geological Survey topographic maps

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(5<:alcl:24,000). FJood hazard areas are plotted on aerial photo_mosaic

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maps prepared especially for this study. The low level aerial photography
was provided by El Paso County and was flown in March 1972. Petailed

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topographic mapping and cross-section data were produced photograrnmetri-

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cally by the Soil Conservation Service. This data was used to compute

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water surface profiles and the flood hazard area outlines. The photos

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wercreproducedonascaleofl"E 200' with a 4-foot contour inter val

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and 2-foot supplementary contours in the flatter areas. Map topo~raphy

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Jury 1970 _ 5ar.d Creek overtops A~denpj Bo~levard.

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complies with national map uccurucy requirements. Thephotographic

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image contains displacements due to relief and it does not match the

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topographic detail in all areas.

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Engineering field surveys for vertical and horizontal control, and

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cross sections at road and bridge crossings were conducted by the Soil

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Consen'ation Service. Survey ere~' assistance ;;as provided br the Cit~.

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of Colora<lo Springs and El Paso County. The vertical control ~'as tied

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to mean sea level elevations using U.S. Geological Survey and U.S. Coa~t

and Geodetic Sun.ey benchmarks. SoilS and COVer data pnrtin"",t to t.he

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Sand Creek watershed ~cre extracted from ses reports for EI Paso County

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and field checked for USe in the hydrologic analyses.

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August 1972 _ Looking west along FOW'ltain Bou~evam,
to the Municipal Airport. Runoff from recent storms
and eroded the road embankm"nt.

main thol'oughfcue
Mocked tl'affic

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