Sample Projects - Drainage
Zuni Route 301 - Hydrologic and Hydraulic Analysis and Design
Zia provided a hydrology, hydraulics, and scour analysis for two existing drainage
structures under Indian Reservation Route Z301. The analysis was conducted utilizing
SCS methodologies, the Army Corps of Engineers (ACOE) HEC-HMS Hydrologic Modeling
HEC-RAS for the fifty-year design frequency storm (Q50) for drainage structure sizing
and recommendations, with consideration for the 100-year design frequency storm
(Q100) relative to overtopping. As a result of the proximity of the structures,
floodplains were intermingled and the analysis was conducted as a multiple opening
system in HEC-RAS. Floodplain mapping obtained from this study is now being used
as the base mapping for an updated floodplain study currently underway.
Zia also conducted hydrologic and hydraulic systems design for a 2.1 mile long roadway
reconstruction project. This included analysis of potential runoff using HEC I computer
program, sizing and design of roadway culverts, a ½ mile long drainage channel with
box culvert driveway crossings and roadway surface drainage systems, and roadside
swales and berms on the Zuni Reservation. The drainage analysis was complicated
by the presence of Malpais (volcanic flow) areas within the upper portions of the
watershed areas.
(Zuni Route 301N–Roadside Drainage Channel)
(Zuni Route 301S Floodplain Mapping & Combined Hydraulics Structures Analysis)
Santo Domingo and San Felipe Pueblos, Bridge Replacement Projects, NM
Zia provided hydrologic and hydraulics analysis for replacement of the two existing
bridges across the Rio Grande into both the San Felipe and Santo Domingo Pueblos,
NM. Work included hydrologic analysis of watershed area encompassing approximately
15,000 square miles (upper Rio Grande Basin extending into Colorado) including statistical
hydrologic analysis of existing gauge data to establish the design flood flow. In
addition, Zia conducted formal hydraulic and bridge scour analysis and preliminary
hydraulic sizing of bridge structure, and bridge overtopping analysis (using HEC-RAS
which replaces the previous HEC-II program), and coordinated efforts with the San
Felipe and Santo Domingo Tribal offices, U.S. Army Corps of Engineers, and Federal
Highway Administration.
The analyses also provided discussion and recommendations for reducing potential
resulting scour through embankment and erosion protection. Analysis effort was complicated
by existing dam structure upstream resulting in a more complex statistical analysis
of existing river gauge data to obtain design flow values as well as due to a very
large floodway overbank area with significant vegetative growth as compared to the
main channel area. Economics analyses included feasibility review of at least three
options for each site from the construction cost and operation / maintenance standpoints.
Cost estimating was conducting utilizing Means estimating software modified with
recent local bid costs for the region obtained from the NMSHTD.
