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FLOOD05850
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Last modified
1/25/2010 7:07:05 PM
Creation date
10/5/2006 1:50:03 AM
Metadata
Fields
Template:
Floodplain Documents
County
Montezuma
Stream Name
Dolores River
Basin
San Juan/Dolores
Title
Field Report - The Dolores River
Date
11/1/2001
Prepared By
CWCB, DNR
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />, <br />- <br />~ <br />- <br />- <br />- <br />II <br />II <br />II <br />II <br />1-1 <br />II <br />II <br />II <br />II <br />II <br />II <br />1-1 <br />II <br /> <br />Related Studies and Information <br />The technical information that was used during the CWCB review include the following <br />items: ' <br />. Flood Hazard Information Study, Dolores River and Tributaries, Dolores, Montezuma <br />County, Colorado. U.S. Corps of Engineers, Sacramento District, September 1978 <br />.. Flood Insurance Study, Montezuma County, Colorado (Unincorporated Areas). <br />Federal Emergency Management Agency, May 4, 1989. <br />. Aerial photographs, Dolores River valley, photo numbers 12-1, 13-2, & 15-2 from <br />project number 77-208, dated 5/31/77. <br />. Aerial photograph numbers DLR-6-1 09 through 115 dated 8-5-96. <br />. Affidavit of Dr. Robert W. Blair, Jr. Ph.D. before the Department of Natural <br />Resources, Colorado Mined Land Reclamation Board, <br />. November 2001 Discussions with Mr. Dale Hatch, Chief, Floodplain Management <br />Services U.S. Corps of Engineers, Sacramento District regarding the Hydrology and <br />Hydraulics Determinations for the September 1978 Floodplain Report. <br />. "Peak Streamflow for USGS gaging station number 09166500, Dolores River at <br />Dolores, Colorado dated 11-02-200l. <br />. Floodplain Resolution Number 00-525 dated September 25, 2000 for Flood Insurance <br />Study, Montezuma County, Colorado, dated May 4, 1989. <br /> <br />Technical Review Findings <br />The CWCB review is based on an evaluation of available infoi:mation and a field <br />inspection of sites 1, 2, and 3 as shown on the location map (map 1). No new field <br />surveys and mapping were obtained, and no new hydrologic or hydraulic modeling was <br />performed for the CWCB review. It was observed during the field inspection that the <br />basin conditions, topography, and runoff characteristics have not substantially changed <br />since the time when the CWCB and Corps of Engineers originally completed the Flood <br />Hazard Information Study during 1977 and 1978. The engineering information in the <br />Corps report was utilized for the official Montezuma County, Colorado Flood Insurance <br />Study dated May 4, 1989. The lOO-year floodplain in the Corps and FEMA studies is in <br />fact the designated floodplain for the Dolores River in Montezuma County, Colorado, <br />The CWCB review focused on the following engineering considerations only: <br />1. Base topographic mapping and field surveys <br />2. Hydrologic analysis <br />3. Hydraulic analysis <br />4. lOO-year floodplain delineation <br />5. Stream and channel geomorphology <br />6. Gravel pit operations impact to the designated 100-yr floodplain <br /> <br />Brief descriptions are provided below for each of the review categories listed above. <br /> <br />1,' Base Mapping and Surveys: The CWCB, in cooperation with Montezuma County, <br />contracted the professional mapping services of Benchmark Mapping Services of Denver, <br />Colorado to compile detailed large mapping of the Dolores River channel and floodplain <br />in 1977. The mapping and surveys were prepared to ''National Map Accuracy Standards" <br />for 2.' and 5' contour mapping. The mapping project set control markers and monuments <br /> <br />2 <br />
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