Washington Hydrography Framework
PROJECT DECISION LOG
Hydro Project Starting Assumptions
Starting assumptions accepted with the understanding that as more information and input was provided they may change.
Spatial Features Needed to Support Hydro Framework (Above the Line/Below the Line)
Accepted Updated Discussion Draft at the Nov. 5, 1997 Hydro FW Meeting.
Technical Solution for the Hydrography Identifier
The 3 part proposed solution was presented to the group and accepted at the Jan. 13, 1998 Hydro FW Meeting (1) Support EPA RR Listed in NHD (2) Implement Dy Seg Model Used by WASWIS (3) Use the IRICC Lat/Long Unique Identifier
100K Hydrography Framework Data Project
Proposal presented at the Feb 10, 1998 FW Meeting and no objection to the proposal made. Project referred to the Hydro Technical WG. Ecology to manage the implementing the Technical Solution adopted on 1/13/98 to the 100K Hydro data.
Acceptance of the WA Hydrography Framework Data Dictionary as our Working Physical Data model
Group understands that changes will need to be made to the model as we work toward implementation
Acceptance of the 1:100,000-scale hydrography data set
as the official 100K Framework data set
Establishment of a new code table within the data dictionary to hold "Line Type" information separate from "Feature Type" information.
A new code table will be established hold "Line Type" information separate from "Feature Type" information. Specifically, a new code table will be established for the line attribute codes
(010, 020, 030, 040, 050) from the WTR_TYPE_CD code table on page 48 of the May 4, 1999 copy of the Data Dictionary.
8) 6/8/99
Differentiating between connecting Centerlines of a route and Centerlines specific to double banked streams.
Related to Recommendation 7, above. Once the line attribute codes are established within the new code table, we will establish a new code(21) for centerlines of water body features but use code (22) for centerline specific to double line steams. We will continue to use the generic centerline code (20) until the centerlines are differentiated between the two types.
The IRICC and the state of Oregon Hydrography Framework Project Partners are requesting cooperation of the Washington Hydrography Framework Project toward the establishment of standardized "core" attributes and ultimately a single data model for Oregon, Washington, and northern California.. The Washington Hydrography Framework Group has determined what level of cooperation and coordination they are willing to invest in with regard to participation in this regional effort to establish a seamless surface water information system for the region.
The Washington Hydrography Framework Group (WAHFG) has considered the request from the Interorganizational Resource Information Coordinating Council (IRICC) to fully cooperate with the Oregon Hydrography Framework Project Partners, the appropriate authorities in northern California, and the IRICC to produce a standardized set of "core" hydrography attributes and work toward a single data model to facilitate a seamless implementation of hydrography for the region.
Consideration was given this request on June 8, 1999 at the regular meeting of the WAHFW in Olympia, WA in which the group discussed the benefits of the proposal, as well as the potential ramifications.
Through consensus the group decided to keep moving forward on the established path but to also invest time to explore areas for coordination that facilitate the IRICC regional effort. The Washington Hydrography Framework Technical Workgroup should explore regional standardization in the following areas.
The Washington Hydrography Framework Group needs to continue to coordinate with the IRICC on the management and tracking of unique identifiers (LLID) for Washington state.
The Washington Hydrography Framework Group's current data model was built through consensus by local, state, and federal, tribal and corporate partners within the state of Washington for use in the state. We need to continue to move forward with this effort while we explore regional coordination. The standardization effort needs to be completed by August 31, 1999. If agreement on regional standards can not be reached by then the Washington Framework Hydrography effort will proceed as originally planned.
Finalization of the Data Dictionary & the Green light to move forward.
The Washington Hydrography Framework Group has considered the Data Model to be complete to the point where the word "working" will be removed from the title and the next phase(Design Phase) of building the physical structures and code tables will begin. The group understands that changes may result from the as a result of:
a) regional coordination effort outlined above in item 9.
b) incorporation of yet to be determined flood inundation information.
c) Database Administrators performing there function to facilitate the most practical and economical implementation of the database.