Public Works
Flood Control - Local Drainage Master PlanVolume 1
Contains Exhibits from Volume 1. Including watershed area, land use, FEMA flood areas, soil areas,
utilities, and a facility summary.
Sheet Index
WaterShed
Land Use
FEMA
Soil - ABCD
Soil
Utilities
Facility Summary
Volume 2
Contains the Local Drainage Master Plan Project report and figures, generic street capacity charts,
street capacity check sheet, Flowmaster facility summary, facility summary, utility conflict matrix,
cost tool summary and full size overall drainage condition exhibits.
Local Drainage Master Plan Project
Existing Drainage Conditions - Study Area Map
Ultimate Drainage Conditions - Study Area Map
11 X 17 Existing and Ultimate Drainage Conditions Maps
Volume 3
Contains figures and exhibits, hydrologic calculations, and hydraulic calculations. The hydrologic
calculations include files with the 10-yr Rainfall Data, Curve Number Matrix, and Time Lag (Standard
Form 4 for areas < 1 square mile and USBR Equation for areas > 1 square mile). Also included are
the HEC-1 output files that are pertinent to the Master Plan. The hydraulic calculations include files for
Flowmaster (for facility sizing based on normal depth and street flow cross sections), facility summary,
flow splits, and street flow capacities and criteria.
Section A Figures and Exhibits
Zoning and Land Use Codes
City of Henderson Land Use Code Description
Land Use Classification Exhibits
Local Drainage Study Land Use
Future Development Plan
Additional Land Use
Section B Hydrologic Calculations
1.1 CCRFCD Supplemental Documentation
1.2 10-Year Rainfall Data
10-yr Rainfall Map
10-yr Rainfall Data
2.1 Curve Number Calculations
3 Subbasin Lagtime Calculations
4 HEC-1 Models (Existing Conditions)
5 HEC-1 Models (Ultimate Conditions)
6 Regional and Local Flow Comparison for Master Plan Facilit
Section C Hydraulic Calculations
2.1 Flowmaster Analysis (Rectangular and RCB Sections)
2.2 Flowmaster Analysis (Circular Sections)
C-1 Watershed
Series A storm centerings
The HEC-1 model names for the storm centerings are listed below along with a description of each model.
C1E3 - SDN3 storm centering for the C-1 Watershed. This model includes the Black Mountain, Mission Hills, Equestrian, SNWA, East C-1 and Northeast C-1 Detention Basins. This model is tributary to the Lower Las Vegas Wash.
C1E4 - SDN4 storm centering for the C-1 Watershed. This model includes the Black Mountain, Mission Hills, Equestrian, SNWA, East C-1 and Northeast C-1 Detention Basins. This model is tributary to the Lower Las Vegas Wash.
C1E5 - SDN5 storm centering for the C-1 Watershed. This model includes the Black Mountain, Mission Hills, Equestrian, SNWA, East C-1 and Northeast C-1 Detention Basins. This model is tributary to the Lower Las Vegas Wash.
Output
10-Year
100-Year
Series B storm centerings
C1E3SC - SDN3 storm centering for the C-1 Watershed. The discharge from the Black Mountain, Mission Hills, Equestrian, SNWA, East C-1 and Northeast C-1 Detention Basins was diverted out of the model to prevent it from combining with areas downstream of the detention basins.
C1E4SC - SDN4 storm centering for the C-1 Watershed. The discharge from the Black Mountain, Mission Hills, Equestrian, SNWA, East C-1 and Northeast C-1 Detention Basins was diverted out of the model to prevent it from combining with areas downstream of the detention basins.
C1E5SC - SDN5 storm centering for the C-1 Watershed. The discharge from the Black Mountain, Mission Hills, Equestrian, SNWA, East C-1 and Northeast C-1 Detention Basins was diverted out of the model to prevent it from combining with areas downstream of the detention basins.
Output
10-Year
100-Year
C1U3 - SDN3 storm centering for the C-1 Watershed. This model includes the Black Mountain, Mission Hills, Equestrian, SNWA, East C-1 and Northeast C-1 Detention Basins. This model is tributary to the LowerLas Vegas Wash.
C1U4 - SDN4 storm centering for the C-1 Watershed. This model includes the Black Mountain, Mission Hills, Equestrian, SNWA, East C-1 and Northeast C-1 Detention Basins. This model is tributary to the Lower Las Vegas Wash.
C1U5 - SDN5 storm centering for the C-1 Watershed. This model includes the Black Mountain, Mission Hills, Equestrian, SNWA, East C-1 and Northeast C-1 Detention Basins. This model is tributary to the the Lower Las Vegas Wash.
Output
10-Year
100-Year
Series B storm centerings
C1U3SC - SDN3 storm centering for the C-1 Watershed. The discharge from the Black Mountain,
Mission Hills, Equestrian, SNWA, East C-1 and Northeast C-1 Detention Basins was diverted out of the
model to prevent it from combining with areas downstream of the detention basins.
C1U4SC - SDN4 storm centering for the C-1 Watershed. The discharge from the Black
Mountain, Mission Hills, Equestrian, SNWA, East C-1 and Northeast C-1 Detention Basins was
diverted out of the model to prevent it from combining with areas downstream of the detention basins.
C1U5SC - SDN5 storm centering for the C-1 Watershed. The discharge from the Black Mountain, Mission Hills, Equestrian, SNWA, East C-1 and Northeast C-1 Detention Basins was diverted out of the model to prevent it from combining with areas downstream of the detention basins.
Output
10-Year
100-Year
Pittman Watershed
Series A storm centerings
XPIT5 - An SDN5 storm distribution was used for concentration points with tributary area greater than 12 square miles. This model includes part of the Pittman Wash watershed for including the Pittman Wash - Burns Channel, and the Pittman Pabco Channel as well as some areas directly tributary to the Las Vegas Wash.
XPIT4 - An SDN4 storm distribution was used for concentration points with tributary area between 8 and 12 square miles. This model includes part of the Pittman Wash watershed for including the Pittman Wash - Burns Channel, and the Pittman Pabco Channel as well as some areas directly tributary to the Las Vegas Wash.
XPIT3 - An SDN3 storm distribution was used for concentration points with tributary area of less than 8 square miles. This model includes part of the Pittman Wash watershed for including the Pittman Wash - Burns Channel, and the Pittman Pabco Channel as well as some areas directly tributary to the Las Vegas Wash.
Output
10-year
100-year
FPIT5 - An SDN5 storm distribution was used for concentration points with tributary area greater than 12 square miles. This model includes part of the Pittman Wash watershed for including the Pittman Wash - Burns Channel, and the Pittman Pabco Channel as well as some areas directly tributary to the Las Vegas Wash.
FPIT4 - An SDN4 storm distribution was used for concentration points with tributary area between 8 and 12 square miles. This model includes part of the Pittman Wash watershed for including the Pittman Wash - Burns Channel, and the Pittman Pabco Channel as well as some areas directly tributary to the Las Vegas Wash.
FPIT3 - An SDN3 storm distribution was used for concentration points with tributary area
of less than 8 square miles. This model includes part of the Pittman Wash watershed for including
the Pittman Wash - Burns Channel, and the Pittman Pabco Channel as well as some areas directly
tributary to the Las Vegas Wash.
Output
10-year
100-year
Series B storm centerings
FPIT5SC - SDN5 storm centering for the Pittman Watershed. The discharge from the Pioneer and
Pabco Detention Basins
was diverted out of the model to prevent it from combining with areas
downstream of the detention basin.
FPIT4SC - SDN4 storm centering for the Pittman Watershed. The discharge from the Pioneer and
Pabco Detention Basins
was diverted out of the model to prevent it from combining with areas
downstream of the detention basin.
FPIT3SC - SDN3 storm centering for the Pittman Watershed. The discharge from the Pioneer and
Pabco Detention Basins
was diverted out of the model to prevent it from combining with areas
downstream of the detention basin.
Output
10-year
100-year
For additional information, contact Albert Jankowiak at 702.267.3024 or by email: Albert.Jankowiak@cityofhenderson.com