FLOOD06837

• County: Alamosa
• Community: Alamosa
• Stream Name: Rio Grande
• Basin: Rio Grande
• Title: Master Drainage Plan Alamosa
• Date: 3/1/1982
• Prepared For: Alamosa
• Prepared By: McCarty-Hurst
• Floodplain - Doc Type: Floodplain Report/Masterplan

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drain the area through the levee to the river at Third, Fourth, and
Main Streets. Ponding occurs at storm sewer inlets and other local-
ized areas.

E. BASIN IV

Basin IV is in the western portion of the study area extending to the
west and northwest nearly three miles along U.S. 160/285. It is
bounded on the north by the railroad embankment, south of U.S. 160/
285, on the east by Railroad Avenue, and on the south by the Hickory-
Jackson irrigation ditch at Coop Road.

The total drainage area of this basin is approximately two square
miles. Nearly 90 percent of Basin IV is undeveloped. According to
future land use plans, the area is designated for residential devel-
opment. Presently there is a small portion of commercial development
in the eastern part of the basin where most of the flooding problems
are located. There are no existing storm sewer systems in this basin.
Currently, stormwaters pond the sale barn area between Eighth Street
and Tenth Street as the area does not have an outlet.

The western portions of the basin are not naturally tributary to the
eastern part of the basin because of all of the natural sumps. Upon
development of the upper portion of the basin, with an improved drain-
age system, more water would be tributary to the lower areas around
the sale barn. This basin currently has no outlet to other basins or
the river. A residential development west of Washington between
Eighth and Tremont created a "moat-like" system by elevating the lots
and grading a swa1e around the area. Driveways pass over the swa1e
from the street to the homes. This system has worked well from the
perspective of draining the improved lots.

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