FLOOD04566 - Laserfiche WebLink

Home Browse Search

I I I I I I I I I I II I I I I I I I I 4 SECTION II THE STUDY AREA The study area in South Boulder covers the drainage basins lying between Boulder Creek and South Boulder Creek. This area is in Township 1 South and Township 1 North, Range 70 and 71 West of the 6th Principal Meridian, The total tributary area of the basins is 12.1 square miles. The elevat- ions range from 5,230 feet at Boulder Creek to 8,461 feet at the southern divide of Bear Creek. The individual drainage basins are as follows: TABLE 11-1 DRA 1 NAGE BAS I NS Gregory Creek Bluebell Canyon Creek King Gulch Skunk Creek Bear Canyon Creek Viele Channel* (at Turnpike) David's Draw (at Broadway) 1.9 sq. mi, .7 sq. mi. .4 sq, mi. 1,7 sq, mi. 5.3 sq. mi. 1.4 sq. mi. .....:l. sq. mi. 12.1 sq, mi. * Includes Anderson Channel All of the basins originate in the mountainous greenbelt land west of the City of Boulder except David's Draw to the far south, The acquisition of greenbelt land in the upper portion of the basins was fortuitous from the flood and debris problem point of view. Development In these basins would have created sediment problems and extra.runoff of large proportions. The South Boulder drainage area consists of approximately 46% mountains and greenbelt lands on which there will be little or no future development, Be- sides being rugged and not applicable to urbanization, the City of Boulder has limited the land to the west that It will serve with water--the Blue Line. Therefore, 5~!o of the total basin will have the future growth In the basin. Growth within the South Boulder drainage area has increased greatly In the last 20 years. In 1950, only 2~!o of the area below the Blue Line was developed. In 1965, this figure was about 6~~. It may be that by the year 2000, all of this area will be developed.