C150204 contract docs

• Contract/PO #: C150204
• Contractor Name: Southeast Colorado Resource Conservation & Development, Inc.
• Contract Type: Grant
• Bill Number: SB 05-084
• Loan Projects - Doc Type: Contract Documents

ARKANSAS VALLEY DRAINAGE STUDY
SCOPE OF WORK
The study will be conducted in two phases, and completed in three years. The beginning
of Year 1 is designated as July 1, 2005, the date that the Colorado Water Conservation Board
grant is to come into effect. A few tasks commenced in late 2004, due to the authorization given
by CWCB to use matching funds provided by other participants to the project.
An interim report to CWCB and other participants in the project will be provided at the
end of Year 1 instead of Year 2, as was indicated in the original proposal. A final report will be
provided to CWCB at the end of Year 2 instead of Year 3, as also indicated in the original
proposal. A supplemental report will be provided at the end of Year 3, following a third
irrigation season of monitoring the beta site(s).
Phase I will involve: (1) GPS/GIS mapping of the current Lower Arkansas Valley buried
tile and surface drainage system as it is known and/or can be identified through fieldwork, and
establishing a drain unit numerical identification system to provide the capability for a more
systematic maintenance of the drainage system. This will be followed by (2) a thorough cleaning
o: one� of the smaller olde� subsurfac;: and surface drainage district svstem; (be��r) svsten� ii; tn� _
Lower Arkansas Valley. Other activities in Phase I include a study tour and workshops for
drainage district representatives, for the purpose of exploring possible consolidation of the 25
plus drainage districts in the lower Arkansas Valley. �
Phase I mapping and cleaning activities wi1L• (a) provide information and experience
needed to estimate the per mile cost of rehabilitating the entire subsurface and surface drainage
system in the Lower Arkansas Valley under three different economic scenarios (discussed
below), (b) provide information on potential changes in the drainage patterns as a result of
drainage system rehabilitation (i.e., through the cleaning of the beta system) and, (c) provide data
to calculate the estimated benefit/cost ratio for the three different rehabilitation scenarios.
Phase II will involve completing the mapping of the drainage systems, compiling data on
changes in the drainage of lands resulting from the cleaning of the beta system, completing the
benefiticost analysis for three scenarios of rehabilitation, conceptualizing an annual Operations &
Maintenance (O & M) plan for the fou� county drainage system, including possible initiatives to
consolidate some 25-plus drainage districts in the lower Arkansas Valley.
Phase I Tasks
1. Conduct a hydrologic study of the pattern of agricultural drainage and its affect on towns
located in the irrigated areas of the valley.
2. Develop a GPS/GIS base map of the drainage systems. Inventory and describe all known
and/or visible features of the subsurface and surface drainage networks in Otero, Bent,
Prowers and Crowley counties.
3. Identify and prepare the beta drainage system.
a. Select beta drainage system.