1. Storm Water Drainage Analysis for Harris County (Crosby, TX)
Ian Barry, Travis Christo, Bethany Schomin, Paul Swope, William Weidman

2. Preexisting conditions
Elevation
Low elevations
Slope of 0.1%
Creek on SE side of the development
Driving force is gravity
Undeveloped land
Land will need to be cleared
CN=84

3. Hydraulics 2-year, 24-hour storm • Soil classification = D
Pd = 4.2inches • Area = 45.3 acres
Type III SCS curve

4. Storm Water Management Model (SWMM)
Insert default parameters
Apply backdrop and plot drainage areas/junctions accordingly
Connect with pipes
Assign pipe lengths and diameters, and junction elevations
Assign rain gage data
Run and adjust until requirements are met

5. Results Requirements Pipe Velocity: 3 – 8 feet per second
Inlet Flows can’t exceed inlet capacity
Water elevation can’t exceed HGL

6. Proposal Needs 5,270 ft of concrete pipe
Ranging from 6 to 8 inches
34 10-foot curb-on-grade inlets
With stand max flow of 4 cfs
34 sub-catchments
23 junctions
23 manhole covers
20 junction boxes
Clearing and grubbing

7. Cost Analysis

8. Cost Analysis

9. Thank You
Any questions?