News & Information
River Basin Plans
Basin Advisory Groups
POWDER/TONGUE RIVER BASIN PLAN
SCOPE OF SERVICES
The 2000 Legislature authorized the Wyoming Water Development Commission to
complete the Northeast Wyoming and Powder/Tongue River Basin portions of the
State Water Plan. The Consultant will complete the tasks and requirements
outlined in this document.
B. PROJECT DESCRIPTION
- Location. The project is located in the Powder River Structural Basin
in Northeast Wyoming.
- Purpose. The project will include the preparation of the Northeast
Wyoming River Basin Plan, which includes the Little Missouri, Belle Fourche,
Cheyenne, and Niobrara River Basins, and the Powder/Tongue River Basin
Plan, which includes the Powder, Tongue, and Little Bighorn River Basins.
All data collected and provided by the Consultant must be compatible with
applicable data standards established by the Water Development
Commission for the State Water Plan, with the database requirements of the
Water Resources Data System, Department of Civil and Architectural
Engineering at the University of Wyoming College of Engineering, and with
the Wyoming Office of Geographic Information Systems.
- History. The 1996 Wyoming Legislature authorized the Wyoming
Water Development Commission (WWDC) and the State Engineer's Office
(SEO) to prepare a proposal for updating the 1973 Framework Water Plan.
In 1997, the Legislature appropriated funds for a water planning feasibility
study. The WWDC and the SEO chose the Bear River Basin as a pilot area
to test planning assumptions, cost estimates and public involvement
techniques. The WWDC and the SEO organized a Basin Advisory Group
(BAG) that met on a regular basis during 1998 and submitted a final report
to the WWDC in September of 1998. The 1999 Legislature authorized the
preparation of river basin plans for the Green and Bear River Basins, which
are currently underway. The Bear River BAG was reconvened to assist with
the planing process. A BAG was also formed in the Green River Basin for
the same purpose. Both Groups are meeting on a regular basis during Plan
development. Following this model, BAGs will be established in both the
Powder/Tongue and Northeast Wyoming River Basin Planning Areas.
- References. Several important documents were generated during
the 1997-98 feasibility study. The Consultant should be familiar with the
following documents, all of which are available for review in the WWDC
Office (Some of these documents and other pertinent information may be
viewed on the Wyoming Water Plan Home Page:
Water Development Commission, et. al. State of Wyoming Water Planning
Questionnaire Report, January 1998.
Water Development Commission, et. al. Final Report: Bear River Basin
Water Planning Advisory Group, September 1998.
Water Development Commission, et. al. 1999 Wyoming Water Planning
Process Implementation Recommendations Executive Summary,
Boyle Engineering Corporation. State Water Planning Process Feasibility
Report, October 1988. Appendix B Data Themes in this document provides
important information on the extent and standards for data collection.
WWDC. Bear River Reference Notebook, and Green River Reference
WWDC. Water Planning Newsletter. Winter, 2000.
C. PROJECT REQUIREMENTS
- Progress Reports
The Consultant shall submit a brief monthly progress report outlining the
study status, progress, and results to date, regardless of whether or not a
billing statement is submitted, on or before the last working day of the
Each billing statement must include a task by task report and receipts for
reimbursable expenses justifying the cost items contained in the billing
statement. The monthly progress report may be used as the justification for
the billing statement as long as all cost items covered in the billing
statement are addressed in the progress report.
- Computer Models, Statement of Assumptions, Project Work File
- a. If the Consultant writes or uses a computer model or spreadsheet
as a part of this project, the Consultant shall submit to the WWDC for approval
all proposed model names and data formats prior to beginning work on that
task. All data shall be submitted to WWDC in written and digital form with the
final report. Digital media shall be labeled by the Consultant to provide
sufficient detail to access the information on the media. User manuals shall be
submitted by the Consultant to WWDC providing complete documentation of
computer models developed under this project. The user manuals shall also
contain the source code language and the type of computer equipment
necessary to operate the model(s). The computer models and spreadsheets
(written and digital forms) are due on the same date as the final report that
contains the information generated by the model.
- b. To facilitate the Commission's accurate evaluation of the Consultant's work
product, computations, conclusions and recommendations, the Consultant shall:
- Include in the final report a section describing the assumptions and
methodology used by the Consultant in generating the data and conclusions
contained in that report.
- Maintain a project work file containing the materials used in project
analysis. This file will be available for review by the Commission and should be
organized in such a way as to allow replication of the steps and procedures used by
the Consultant to reach the conclusions described in the study.
- Prepare a project notebook containing a description of the assumptions and
methodologies used in the project analysis. The notebook shall be organized in
such a way as to allow replication of the steps, calculations, and procedures used
by the Consultant to reach conclusions, described in the draft final report. The
project notebook shall be submitted with the draft final
- Cost Estimates
The Consultant shall provide, as a part of project cost estimates, an estimate of:
- a. The cost to prepare final plans and specifications.
- b. The cost to acquire permits and to mitigate project impacts.
- c. The cost of project legal expenses.
- d. The cost of acquiring access and rights-of-way.
- Calculation of Engineering Costs and Contingencies
The Consultant shall use the following format and guidelines in calculating final cost es-
Final Cost Estimates
Preparation of Final Designs and Specifications $___________
Permitting and Mitigation $___________
Legal Fees $___________
Acquisition of Access and Rights of Way $___________
Cost of Project Components $__________
Construction Cost Subtotal #1 $__________
Engineering Costs = CCS #1 x 10% $__________
Construction Cost Subtotal #2 $__________
Contingency = CCS #2 x 15% $__________
Construction Cost Total $__________
Project Cost Total $__________
- Final Report
The Consultant shall use the Contract Scope of Services as the outline for draft and final
reports so that Consultant compliance with Contract provisions can be verified. IF THE
FINAL REPORT CONTAINS INFORMATION OF AN ENGINEERING NATURE,
THE COVER OF THE FINAL REPORT, ALL PLATES, AND THE EXECUTIVE
SUMMARY MUST BE STAMPED AND SIGNED BY A PROFESSIONAL
ENGINEER LICENSED IN THE STATE OF WYOMING. IF THE FINAL REPORT
CONTAINS INFORMATION OF A GEOLOGIC NATURE, THE COVER OF THE
FINAL REPORT, ALL PLATES, AND THE EXECUTIVE SUMMARY MUST BE
STAMPED AND SIGNED BY A PROFESSIONAL GEOLOGIST LICENSED IN THE
STATE OF WYOMING.
- Final Report - Digital Format
In addition to the paper submittal described in Section C.5 above, the Consultant shall also
provide the final report in a digital format. This digital format shall contain the final report
in its entirety, including all text, tables, plates, figures, etc. The deliverables under this
section shall be contained on a standard CD ROM(S). The document shall be in
WordPerfect 7, or compatible, format. Any plates, figures, etc. not suitable for
WordPerfect 7 shall be in AutoCad 14, ArcView 3.2, or compatible, format. Other
formats may be used if approved in advance by the WWDC project manager.
- Anticipated Project Funding Assistance
The Consultant shall clearly identify project components eligible for WWDC funding, both
in cost estimates and in project mapping. The Consultant shall verify project component
funding eligibility with the WWDC prior to commencing any economic analysis. Unless
otherwise directed by the WWDC project manager, the Consultant shall assume that all
projects will be funded with a 50% grant and a 50% loan. The WWDC loan portion of
the project will be financed at the interest rate established by the State Lands and
Investments Board (presently 7.25% for municipal and domestic and 6% for agriculture)
with a term to be specified by the WWDC project manager. If funding is anticipated from
another agency, such as the Office of State Lands and Investments, Abandoned Mine
Lands (AML) or Rural Utility Service (RUS), the Consultant shall prepare cost estimates
for system components not eligible for WWDC assistance in a format and level of detail
acceptable to the potential funding agency.
If required in the Contract Scope of Services, the Consultant shall provide the information
necessary to complete applications to RUS, the Office of State Lands and Investments,
and any other identified funding sources.
- Project Access
The Consultant shall be responsible for obtaining access as required for project tasks.
- Units of Measurement
All units of measurement used in the water planning process shall be English.
PHASE II. - POWDER / TONGUE RIVER BASIN PLAN
Task 1. Meetings
The Consultant shall attend Basin Advisory Group (BAG) meetings, which will be held every
other month for the duration of the contract. For cost estimating purposes the Consultant shall
assume twelve meetings with the BAG, three hours in length, in the basin. WWDC will arrange
meeting places, provide public notification, prepare agendas, and provide a facilitator for the
regular BAG meetings. The Consultant shall be prepared to give a presentation on current work
progress at each meeting and to respond to comments from those in attendance. The Consultant
shall prepare the meeting record for each meeting in a format determined by WWDC, and deliver
same, in both digital and written formats, to WWDC within 7 days of the meeting.
Project meetings shall be conducted as necessary for the coordination of project activities and for
informing the WWDC of project progress. Due to the number of agencies, entities, and
individuals with a stake in the outcome, the Consultant shall be in regular contact with the
WWDC Basin Plan Project Manager. This coordination is necessary to promote consistency in
the basin planning process and compatibility of planning products. For cost estimating purposes
the Consultant shall assume eighteen project meetings will be held in Cheyenne.
Task 2. Basin Water Use Profile
The Consultant shall inventory current consumptive and non-consumptive surface
water and groundwater use within the basin of interest. Water use will be divided
into the following categories:
Water Use from Storage
The Consultant shall identify and document previous water use studies and planning documents
and, if applicable, incorporate those results into this task.
Concurrent with developing the Basin Water Use Profile, the Consultant shall collect information
regarding both actual and perceived current water problems within the basin. The Consultant
shall use the Basin Advisory Group (BAG) as a resource in identifying water concerns. The
Consultant shall prepare a technical memorandum outlining water-related concerns within the
basin, including location and approximate magnitude of current water shortages and water quality
issues. Water quality issues should include sediment, total dissolved solids and individual
constituents, and point source discharges.
Base Topographic Data
The Consultant shall develop a 1:24,000 scale digital map based on USGS Quadrangle Mapping
for the basin. These base maps should include hydrography, roads, towns, and other physical
features. The individual GIS layers in base maps shall be used to provide context, when
appropriate, to other planning product layers as well as a source for general information.
Scale and Accuracy of GIS Data
The Consultant shall use and prepare the appropriate scale GIS data as specified in the Scope of
Services and under the direction of the project manager. The Consultant shall only represent map
scale as intended by the creators of any specific GIS coverage. (For example, 1:100,000 scale GIS
data should be noted as such when represented in association with 1:24,000 scale data.) GIS
layers created as part of this scope shall be at a 1:24,000 scale. Basin planning products compiled
from existing GIS data sources for this scope shall use the largest scale data available. Refer to
Boyle report, Appendix B Description of Data Themes and table #2, Planning Process Data.
The Consultant should identify, record and use the most current data available to
produce planning products, and shall adhere to USGS National Mapping Accuracy
Standards when developing GIS planning products. The Consultant shall record and
provide metadata on all GIS products. All metadata will be Federal Geographic Data
Committee compliant. All GIS deliverables will be provided as Arc-Info export files,
Arc-View Shape files, and DXF files. In general, all data generated during the
planning process shall be of sufficient detail, documentation and accuracy to meet
2A. Agricultural Use
The Consultant shall estimate the agricultural use within the basin by determining current
irrigated acreage, estimating crop types, and estimating crop consumptive use. In
addition, the Consultant shall obtain all diversion records applicable to the selected period
of record, and prepare descriptions of large irrigation operations. Water spreading is
an irrigation practice utilized in this basin which will require special
attention, therefore the Consultant shall consult with the WWDC prior to
work on this task.
1. Determine Irrigated Acreage
The Consultant shall prepare basin wide mapping of irrigated lands
based on current imagery, and shall obtain existing irrigable lands
coverage. If suitable imagery is not available it shall be acquired as
part of this project. These coverages shall be imposed on a 1:24,000
scale digital USGS Quadrangle Map based in ArcInfo. These
coverages shall be consistent with the Wyoming Geographic
Information Advisory Council (WGIAC) GIS Hardware and Software
Standards, and mapping completed for the Green and Bear River
Basins. This base mapping shall include topography, hydrography,
roads, towns, and other physical features in the basin.
The State Engineer's Office Water Division Superintendent will assist
in field checking to verify actual usage. The Consultant shall
incorporate the Division Superintendent's comments and corrections
into the final irrigated acreage mapping, and actual acreage under
irrigation will be determined. The Division Superintendent will also be
questioned regarding lands where consumptive use requirements are
generally not satisfied by available water supplies. Again, water
spreading will require special attention with regard to this topic.
2. Estimate Crop Types
Water requirements vary by crop type, therefore, it is necessary to
estimate the types of crops under irrigation. The Consultant shall
determine cropping patterns using Wyoming Agricultural Statistics and
National Resource Conservation Service (NRCS) data for irrigated lands
published yearly by county. The local water commissioner and irrigation
district officials will be contacted to review the resultant crop types, to
provide additional detailed information on cropping patterns, and to
provide input on yearly variance in crop types.
3. Estimate Crop Consumptive Use
Based on the irrigated acres of each crop type, water requirements
can be estimated. The Consultant shall use consumptive use values
presented in WWRC Publication #92 - 06, "Consumptive Use and
Consumptive Irrigation Requirements in Wyoming", or more recent
documents as approved by the WWDC. In addition to average
monthly consumptive use, dry year and wet year monthly
consumptive use values will be determined. Dry and wet year crop
consumptive use will be determined from the maximum and minimum
values reported in WWRC publication #92-06.
Water-short systems may not be able to satisfy consumptive use
requirements during average or dry years. Therefore, a realistic value
of actual water use, or supply-limited consumptive use, must be
estimated. Based on previous water use studies, and information
from the local water commissioner, the Consultant shall estimate the
water supply-limited consumptive use for water-short systems.
Estimated supply-limited consumptive use will replace calculated
consumptive use for the associated acres.
4. Determine Source of Supply
The Consultant shall review the irrigated lands mapping and determine
the source of supply, including groundwater, surface water source,
and storage. Defining the agricultural use in a basin does not require
that specific lands irrigated be associated with their individual water
rights. Therefore, associating each water right with its respective
irrigated acreage is not included in this scope. The SEO maintains a
groundwater permit database that is considered a reasonable
representation of current well locations and uses. The Consultant
shall query the groundwater database for groundwater permits issued
for agricultural use, and utilize other records of the SEO as
appropriate for the level of accuracy required. Monitor well permits,
enlargement permits, and canceled or abandoned permits should be
excluded. The Consultant shall catalog all active agricultural wells
with permitted production rates equal to or greater than 50 gallons
per minute. The locations of agricultural wells will be extracted from
the SEO database and incorporated into a GIS layer at 1:24,000
scale. Lands irrigated under groundwater permits will be identified.
The Consultant shall assume that consumptive use requirements not
met by adjudicated wells are met by surface water sources, including
The Consultant shall provide for water right attribution for all water
rights within the basin excluding only stock permits. The Consultant
shall perform the following tasks:
- Obtain or prepare maps that identify polygons of irrigated
- Compare polygons of irrigated lands to records of the
State Engineer for both surface and groundwater.
- Abstract water right information (permit number, priority,
amount, use, type, etc.) and assign polygon an attribute
- Associate polygon attribute numbers with water right
information and develop a database.
- Submit draft mapping to appropriate State Engineer
personnel for review and comment.
The Consultant shall compile, as appropriate to the selected period of
record, all diversion records for diversions with headgate capacity
equal to or greater than 10 cfs from the Board of Control
Hydrographer's Annual Reports and from each irrigation district.
These diversion records shall be associated with the appropriate
irrigated acreage. The Consultant shall prepare operating information
memorandums for ditches with capacity equal to or greater than 10
cfs, and for each irrigation district. Each memorandum should include
a brief history, a general description of the system, water rights and
structure operations, additional supplies from storage, general location
and distribution of return flows, and a physical description. These
memorandums should give enough detail to assist in any level of flow
modeling, from simple water budgets to detailed computer simulation
Data on agricultural use will be compiled and presented in tabular,
graphical, and spatial forms. Examples of data presentation
- A table listing irrigated land by major tributary basin with
an accompanying bar-chart.
- A pie-chart summary of crop distribution.
- A table listing crop distribution acreage with an
- A table listing monthly agricultural water use for average,
wet, and dry years.
- A GIS data layer of irrigated lands.
- A GIS data layer showing location and permit data for
- A breakdown of groundwater and surface water supplied
2B. Municipal and Domestic Use
During the summer of 1999, the WWDC conducted a survey of known
municipal and non-municipal community public water systems in Wyoming.
The Consultant shall use the State of Wyoming 2000 Water System Survey
Report to determine the municipal and rural domestic water supplies/uses
within each basin. Information regarding the average and peak day use, as
well as the surface source of water and/or the number of supply wells, is
published in this document.
The Consultant shall identify wells permitted for municipal use by the SEO,
and place the information in a GIS data layer / spatial database. Monitor
well permits, enlargement permits, and canceled or abandoned permits
should be excluded. The Consultant shall catalog all active wells with
permitted production rates equal to or greater than 50 gallons per minute.
The Consultant shall use the WWDC Water System Survey to determine the
average monthly diversion and/or pumping, additional supplies from
reservoirs, the estimated consumptive use, the river location of treated
return flows, and variance in average use during dry and wet years for each
municipality. The Consultant shall verify and complete data by direct
contact with individual system administrators if necessary. If these data are
unavailable, the average day use from the Water System Survey will be
used and the consumptive use will be estimated to be forty-five percent
(45%). This value is used by the WWDC when estimating municipal
consumptive use in spreadsheet models and is considered acceptable.
The Consultant shall identify wells permitted for domestic use. These wells
shall be aggregated into groups of appropriate size and the information placed
on a GIS data layer at a representative location.
Data on municipal and domestic use will be compiled and presented in tabular,
graphical, and spatial forms. Examples of data presentation include:
- Breakdown of groundwater and surface water supplied for
public water systems.
- Table listing average monthly consumptive municipal water
- Table summarizing permitted domestic use.
- GIS data layer showing location of municipal water use within
- GIS data layer showing location and permit data for municipal
wells and aggregated domestic wells.
Determining surface water rights for municipalities is not necessary for
defining the municipal water use within a basin, therefore it is not included
in this scope.
2C. Industrial Use
In many areas of Wyoming industrial water use is a significant component of
the overall basin water use. The Consultant shall identify industrial users
not supplied through municipal systems through discussions with local
water commissioners, county assessors, and others. Wells permitted for
industrial and miscellaneous use will be identified from the SEO records and
shown on a GIS data layer. Monitor well permits, enlargement permits, and
canceled or abandoned permits should be excluded. The Consultant shall
catalog all active wells with permitted production rates equal to or greater
than 50 gallons per minute for all industrial uses. The Consultant shall
catalog all active wells, regardless of permitted production rate, for those
wells associated with coal bed methane production. The Consultant shall
survey identified users to determine their average monthly diversion and/or
pumping, and their resulting consumptive use. If these data are unavailable,
the maximum permitted production rate will be assumed for wells, and the
consumptive use will be estimated based on the average consumptive use
for the type of industry.
Data on industrial and miscellaneous use will be compiled and presented in
tabular, graphical, and spatial forms. Example of data presentation include:
- A breakdown of groundwater and surface water produced for
- A table listing average monthly industrial water
- A GIS data layer showing location of industrial water
production/use within the basin.
- A GIS data layer showing location and permit data for industrial
Determining and cataloging surface water rights for industrial use is not
necessary for defining the industrial water use within a basin, therefore it is
not included in this task.
2D. Recreational Use
The Consultant shall compile readily available data and mapping on public
campgrounds, marinas, state and national parks, and historic areas and
monuments in the basin as an indicator of water-related recreational
activity. The Consultant shall hold discussions with the Wyoming Business
Council, the Wyoming Department of State Parks, the Wyoming Game and
Fish Department, and others regarding economic information on recreation.
The Consultant shall prepare a memorandum that describes qualitatively the
water-related recreational activities within the basin, and brackets the
optimum reservoir levels and streamflows that promote maximum use.
Existing GIS mapping showing stream classification and other recreational
information will be identified and referenced, and included as appropriate in
the basin plan.
2E. Environmental Use
Environmental water use, including minimum reservoir pools and releases,
and instream bypass requirements to enhance fisheries and wildlife habitat,
is important in defining the overall water use within a basin. The Consultant
shall compile existing minimum reservoir releases and instream bypasses,
and show their location on a GIS map layer. Existing GIS mapping showing
wetlands, big game habitat, and other environmental information will be
identified and referenced, and included in the basin plans. The Consultant
shall survey local environmental interests for input. The Consultant shall
prepare a memorandum that describes qualitatively the water-related
environmental uses and benefits within the basin and brackets the optimum
streamflows and/or reservoir levels for these benefits.
2F. Water Use from Storage
Storage of supplemental water for municipal, industrial, and late-season
agricultural use is often an important component of basin water use in
Wyoming. The Consultant shall identify all reservoirs permitted for other
than stock uses from the State Engineer's Office records. Information to be
obtained for each reservoir, as applicable to the selected period of record,
include: permitted storage rights, historical end-of-month reservoir contents,
area-capacity tables, evaporation rates, spillway and outlet capacity, project
water right owners, average monthly release rates, and operational criteria
including flood forecasting and hydropower generation. Diversions served
by the reservoir will be identified and shown on a GIS layer. An operation
memorandum will be prepared for each reservoir in sufficient detail for use
in flow modeling tasks.
Data on reservoir storage will be compiled and presented in tabular form.
Examples of data presentation include:
- A table listing average monthly storage for reservoirs.
- A table listing estimated average monthly evaporation for
Task 2. Deliverables
Tabular, Graphical, Spatial Data
- Irrigated acreage
- Crop distribution
- Average, wet, and dry year monthly agricultural use
- All agricultural diversion records
- Agricultural well information
- Reservoir locations
- Average monthly municipal water use, including
- Average monthly industrial water use, including
- Inventory of all irrigated lands in the basin with associated
water right information for both surface and
- Bibliography of previous water use studies
- Current water shortages and other concerns
- Diversion operations
- Reservoir operations
- Recreational water use
- Environmental water use
Task 3. Available Surface Water and Groundwater Determination
The Consultant shall develop spreadsheet modeling tools to determine streamflow
in the basin during average, wet, and dry years, under current operating
conditions. This tool will be used to verify the water use determined in Task 2, to
determine additional available flow for future use including the constraints of
compacts and decrees, and to assess the impacts of future water use
opportunities. The modeling shall be documented within the spreadsheet through
visible equations, links, and text descriptions of assumptions and data sources.
The Consultant shall identify available tributary and non-tributary groundwater
3A. Surface Water Data Collection and Study Period Selection
Diversion records, reservoir operations and physical parameters, return flow
information, and consumptive use estimates, gathered or determined in Task
2, will be required. Additional data to be collected include streamflow
records, average annual precipitation, and water sales. A base map will be
prepared showing basin hydrography on a GIS layer at 1:24,000 scale. This
mapping shall include basin and sub-basin boundaries, stream networks, and
major (>500 acre-feet) reservoirs and lakes.
Based on available data the Consultant will select a study period for use in
the model to represent average, wet, and dry years. It is important that the
period of record used in the model reflects the range of conditions
experienced in the basin over the long term. The study period should ideally
have a prolonged period of drought, a period of high runoff years, and
periods reflecting average conditions. The Consultant shall use the entire
selected period of record to determine the average year monthly
streamflows. Annual total streamflow values will be ranked, with the years
falling at or below the 20th percentile used to determine dry year monthly
streamflows. The years falling at or above the 80th percentile will be used
to determine wet year monthly streamflows. The average monthly flows for
each period representing average, wet, and dry conditions will be
determined from the arithmetic mean of the representative data.
Coordination with the Northeast, Green, and Bear River Basin Plan
Consultants will be performed, as appropriate, throughout this process to
provide consistency in spreadsheet model assumptions and output
3B. Surface Water Data Synthesis and Spreadsheet Model
When performing mean monthly analyses, gaps in available data can often
be ignored by simply not using any data for these months or years. If
necessary, the Consultant will extend and fill gaps in the available data
using appropriate, accepted hydrologic techniques. Data to be synthesized
include streamflow, reservoir end-of-month contents, and diversion records.
The Consultant shall determine mean monthly flows and reservoir storage
values by calculating the arithmetic mean of the available data for each
month. Average, dry and, wet year monthly water use determined in Task
2 will be used. If diversion records were obtained, diversions and return
flows will be accounted for, otherwise, consumptive use estimates will be
The Consultant shall review the locations of water use and storage identified
in Task 2F. Each of these locations will be represented as a node and the
stream reaches between each node will be modeled. Typically, only
tributaries with diversions are included. Other tributaries may be
represented as a node to account for contributing streamflow. In addition,
the Consultant shall represent streamgage locations as nodes. If necessary,
the linked node representation will be modified to better suit the available
data. The Consultant shall provide a schematic of the linked node
The Consultant shall develop virgin flows at each node selected for inclusion
in the analysis. If no major single or aggregate diversions or storage
facilities exist above a node, historical flows represent virgin flows and no
adjustments will be required. Small diversions not identified during Task 2
will be left in the gage. They will not be included during virgin flow
development nor removed during model development. If identified
diversions are made upstream of a node, the flows will be adjusted to a
virgin condition by adding diversions, and subtracting flows that return that
month above the node. In addition, the effects of upstream storage facilities
will be added or subtracted. If tributaries with substantial diversions are not
gaged, factors will be developed to distribute virgin flows seen at
downstream gages based on drainage area and precipitation. Historical
gains and losses due to groundwater interaction and stream surface
evaporation will be estimated during the virgin flow determination process,
along with other ungaged inflows, as the difference between gaged flows
when all known storage and diversion effects are accounted for.
For the agricultural, municipal and industrial diversion records obtained in
Task 2, return flows will be calculated as diversion less consumptive use.
Industrial and municipal return flows will be assumed to return to the river
during the month of diversion, unless otherwise determined in Task 2. The
Consultant shall estimate agricultural return flow timing and location using
data derived from existing studies, if available. Based on the information
gathered in Task 2, generalized return flow patterns and timing will be
estimated and applied as appropriate.
If diversion records are not available, the consumptive use determined in
Task 2 will be used directly rather than estimating both diversions and
The Consultant shall develop three spreadsheets to simulate river flows
within the basin for average, wet, and dry year conditions. Average
streamflows will be calculated at each node beginning with the virgin flow
at the headwater reaches. Diversions will be subtracted from the nodes and
return flows added back in at the nodes, or, if no diversion records exist,
depletions may simply be subtracted. The simple addition and subtraction
will proceed sequentially downstream until the basin mouth is reached. The
spreadsheets will take compact or decree restrictions into
3C. Surface Water Model Calibration
Each model will be calibrated by comparing the average simulated flows to
average measured flows at key streamflow gages. Likewise, the simulated
end-of-month reservoir contents will be compared to average measured end-
of-month reservoir contents, where available. If necessary, the Consultant
shall review and adjust any assumptions made during Task 2 and Task 3
until modeled and historical streamflows and reservoir contents match
reasonably well. The Consultant shall prepare a memorandum that outlines
the modeling process including data extension methodologies, modeling
assumptions, and calibration results.
3D. Available Surface Water Determination
The Consultant shall execute the spreadsheet model to determine the
available flows in the basin for average, wet, and dry year conditions. The
Consultant shall prepare a memorandum that describes the results of the
three model executions and outlines available flows in tributary and main
3E. Available Groundwater Determination
The Consultant shall obtain existing information on aquifer locations,
storage, yield potential, etc. The Consultant shall identify and document
previous groundwater studies and planning documents and, if applicable,
incorporate that information into this task. Coal Bed Methane development
in the basin may have both positive and negative effects on the basin's
short and long term groundwater and surface water supplies. The
Consultant shall characterize this development and analyze its impacts.
Groundwater modeling has been performed as part of the Coal Bed Methane
Environmental Impact Statement. The Consultant shall utilize this effort to
avoid duplication of effort. If necessary, the Consultant shall prepare a
groundwater model(s) for appropriate areas and aquifers of the basin. The
Consultant shall prepare a memorandum discussing the potential for
additional aquifer storage and development and the potential effects, if any,
that development might have on the groundwater and surface water
Task 3. Deliverables
Tabular, Graphic, Spatial Data
- Basin hydrography
- Average annual precipitation
- Schematic of linked-node representation
- Spreadsheet modeling tools
- Aquifer locations
- Aquifer storage and yield potential
- Bibliography of previous groundwater studies
- Modeling process
- Model execution and available flows
- Aquifer storage and yield potential
Task 4. Demand Projections
4A. Review Socioeconomic, Economic, Demographic and other data
- Gather current and recent historical economic and demographic
data for the study area.
- Where relevant for subsequent analysis and modeling -- gather
data for the State of Wyoming and the U.S. as a whole.
- Examine and evaluate projections of economic and
demographic change for the study area, the relevant counties, the
State of Wyoming as a whole and, as relevant, for the U.S.
- In particular, examine both the Wyoming Population Forecasts
and the Wyoming Economic Forecast Model, available through the
State Data Center.
- Gather and evaluate available projections from the Wyoming
Business Council, and other sources.
- Develop charts and tables summarizing current economic and
demographic conditions in the study area, trends in key economic and
demographic measures and key relationships.
4B. Identify Planning Scenarios
- Develop preliminary recommendations for baseline, moderate
growth, and high growth planning scenarios.
- Review recommendations for consistency with the Northeast,
Green, and Bear River Basin Plan economic consultants, or their
products, and resolve or justify differences.
- Recommend three alternative planning scenarios (baseline,
moderate and high growth) for approval by the WWDC.
4C. Define Methodology
- Define the methodology for developing water demand projections
for the basin.
- Examine and evaluate the appropriateness of alternative
economic modeling tools (e.g. input-output models and econometric
- Among the methodological issues to be determined in this
- a. Basis for projected changes in basic sector activity
- b. Technique for linking basic employment to local
- c. Feasibility of cohort component demographic
modeling versus simplified demographic approaches;
- d. Key assumptions (commuting patterns into and out
of the basin, labor force participation rates,
- Develop preliminary recommendations regarding methodology
and assumptions for water demand projections.
- Review recommendations for consistency with the Northeast,
Green, and Bear River Basin Plan economic consultants, or their
products, and resolve or justify differences.
- Make recommendations regarding methodology and key
assumptions to the WWDC, along with a description of the basis for
4D. Construct and Calibrate Economic and Demographic
- Construct and calibrate economic and demographic forecasting
- Conduct interviews with local sources as needed to better
understand key industries and other economic and demographic
aspects of the basin.
- Use the model to produce projections of economic activity and
population under each of the three planning scenarios. The
projections will incorporate a thirty-year horizon.
- Review the economic and demographic projections prior to
developing related projections of water demand.
4E. Project Water Demands
- Develop water demand projections under each of the three
- Incorporate water demand coefficients appropriate to each
water use sector.
- Incorporate water requirements for recreation and
- Document the water demand projections in a task
- Review the water demand projections with the Basin Advisory
4F. Consistency Reviews with other River Basin Plans
- Prepare for and participate in two Cheyenne meetings with the
other River Basin Plan Consultants to compare and coordinate
methodologies, models, and data developed during the course of the
- Offer and consider suggestions on how to keep the two basin
studies consistent with each other, and with the Green and Bear
River Basin Plans.
Task 4. Deliverables
Tabular, Graphic, Spatial Data
- Planning scenario recommendations
- Forecast methodology recommendation
- Forecasted agricultural, municipal, industrial, recreational, and
Task 5. Future Water Use Opportunities
The Consultant shall use the current shortages and needs identified in Task 2,
water availability identified in Task 3, projected future demands identified in the
Task 4, and information generated through the Basin Advisory Group (BAG)
meetings as a basis for this task. Both structural and non-structural potential
future water use opportunities will be identified to meet current shortages and
needs, as well as the Baseline, Moderate, and High levels of projected demand.
Both surface water and groundwater sources will be considered. Future water use
opportunities will be identified to satisfy projected agricultural, municipal,
industrial, recreational, and environmental demands.
5A. Describe Issues Affecting Future Water Use
The Consultant shall identify issues that may potentially restrict future water
use opportunities in the basin. The issues include, but are not limited to,
water quality issues, compact requirements, federal legislation such as the
Endangered Species Act, the Clean Water Act, and the Safe Drinking Water
Act, etc. The Consultant shall prepare memorandums that describe
potential limitations to future water use due to these, and other issues.
5B. Define Water Use Components Screening Criteria
The Consultant shall develop evaluation criteria and methods for comparing
and ranking alternative structural and non-structural components according
to the following factors: water availability, technical, economic,
environmental, legal and institutional, public acceptance, water quality, and
ability to satisfy multiple demands. Defining the screening criteria prior to
developing a long-list helps assure that the criteria are not biased towards
any particular future water use opportunity. The criteria will be submitted
to the BAG for review and to the WWDC for approval.
5C. Develop Long-list of Future Water Use Opportunities
The Consultant shall compile a list of potential structural and non-structural
opportunities to meet current and projected demands. The long-list will
include new and previously proposed projects in the basin, common
solutions to water shortages applicable to the basin, opportunities identified
by the BAG, and others. Structural components may include, but are not
limited to storage reservoirs, conveyance system upgrades, water
distribution system enhancements, groundwater development, aquifer
storage and recovery opportunities, in-basin water transfer components, and
trans-basin diversion components. Non-structural components may include,
but are not limited to basin-wide conservation and management, revised
reservoir operations, municipal conservation, improved farm efficiencies,
water right transfers and exchanges, water banking, and conjunctive use
5D. Develop Short-list of Future Water Use Opportunities
The Consultant shall develop a short-list of future water use opportunities
for review by the BAG and WWDC. The Consultant will use the results of
the flow modeling spreadsheets to determine mainstem and tributary
reaches with flow available for future use. Proposed opportunities that do
not, in whole or in part, satisfy existing shortages or projected demands will
be eliminated. Information such as land ownership, wetlands, threatened
and endangered species, impaired stream segments, water quality issues,
floodplain mapping, and cultural resources will be used to identify fatal
flaws likely to restrict permitting of structural projects. Aquifer storage,
groundwater quality, and yield potential will be used to identify fatal flaws
associated with groundwater development and conjunctive use options.
Much of the information used to identify fatal flaws is available in the
Groundwater Vulnerability modeling done by the Department of
Environmental Quality, and other spatial databases, and should be used to
explain the results of this task.
5E. Apply Screening Criteria to Rank Short-list of Future Water Use
The screening criteria approved by WWDC will be used to rank the short-list
of future water use opportunities. The Consultant will determine the ranking
using all screening factors. The Consultant will present this work to the
BAG at one of their regular meetings, and the rankings and comments will
be submitted to the WWDC for approval.
5F. Water Quality Issues
The Consultant shall identify basin-wide opportunities to enhance or protect
water quality. The Consultant shall identify on-going watershed
management planning by other entities, and define opportunities for
cooperation and coordination among these efforts. State and Federal
agencies and other appropriate entities will be contacted to identify areas
within the basin where water quality issues are being investigated, including
the Department of Environmental Quality, the State Engineer's Office, the
Game and Fish Department, the Wyoming Association of Conservation
Districts, the Bureau of Land Management, the Natural Resources
Conservation Service, the U.S. Geological Survey, and the U.S.
Environmental Protection Agency. Monitoring locations and areas of
concern identified by these sources will be shown on a GIS layer.
Task 5. Deliverables
Tabular, Graphic, Spatial Data
- Collection of existing GIS layers (cultural resources, endangered
species, critical habitat, etc.) to identify fatal flaws.
- Mapping showing proposed future water use opportunity
- Potential limitations to future water use
- Screening criteria
- Long-list of future water use opportunities
- Short-list of future water use opportunities
- Opportunities to enhance or protect water quality and
Task 6. Basin Advisory Group Discretionary Task
This task holds 15% of the total contract amount in reserve to address issues
identified by the Basin Advisory Group. The Consultant shall not proceed with any
work under this task until the WWDC and the Consultant execute a contract
amendment defining the work to be completed.
Task 7. Basin Planning Report
On or before November 1, 2001, the Consultant shall submit to WWDC:
- Twenty-five (25) copies of the draft report presenting the results of
- One project notebook as described in subsection C.2.b.;
- Digital copies of the above;
On or before December 15, 2001, after receipt and incorporation of WWDC review
comments, the Consultant shall submit to WWDC:
- Fifty (50) stamped and signed copies of the final report;
- One (1) stamped and signed unbound reproducible original of the final
- Fifty (50) stamped and signed copies of the Executive Summary, to
be no more than ten (10) pages in length;
- One (1) stamped and signed unbound reproducible original of the
- Three (3) digital copies of the final report and executive
- Three (3) digital copies of all related text files, database files, and GIS
coverages; This information will comply with the format and standards set
by WRDS for water planning information.
The Consultant may be asked to participate in public meetings, legislative hearings
or WWDC meetings to present findings. The Consultant should budget for two (2)
meetings after the submittal of the draft report, one in Cheyenne and one in the
basin of interest.