Water Drainage System

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Water Drainage System




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Slide1

Water Drainage SystemHarris County, TX

Hydro point

llc

. (Team 1) –

landon

allen

,

chadi

kanan

, Catherine Lundberg, Michael

rauschuber

, Fernando

torres

Slide2

Introduction and Problem

Design

Pipes

Junctions (two inlets per junction)

Gravity System

Water Drainage

System

Construct a storm sewer design

Accommodate 2 year, 3 hour storm design

Prevent

impacts

downstream

Area

Crosby, Texas (Harris County)

Gum Gully Creek (Outfall)

Slide3

Project Area

Land Area: 48.85 acres, north west of Gum Gulley CreekEnclosed by Jolly Boat Dr., Broken Back Dr., and Golf Club Dr. Elevations ranging from: 14’ (water surface of Gum Gulley) to 48’ (north west corner of area) above mean sea level. Soil CH-fat clay, hydrologic soil group D – clays that are highly impermeable (Web Soil Survey)Water shedUndeveloped grassland with trees that is used for agriculture or as a natural habitatLarge portions are undeveloped and unfarmed forest

Outfall at Gum Gulley Creek

Slide4

Hydraulics

Curb on grade inlets (15’ and 20’)

Capacity and area that matches capacity

Prevent erosion

No detention basin needed

Meet velocity requirements (3-8 fps)

Outfall elevation

EPA SWMM 5

Junction Placement

Rain Gage – 2 year design storm, 3 hour SCS

Type

III hyetograph

Backfill – Alter outlet offset to lower velocities and maintain at least minimum slopes

Examine area through 18:30 to examine all flow

Slide5

Velocity:Maximum at Conduit 31 (7.72 fps)Minimum at Conduit 26 (3.11 fps)Slope:Minimum at Conduit 13 of 0.0016 (0.0013 required)BackfillMaximum at Junction 24 of 10.5ftMinimum at Junction 1 of 3ft

Hydraulics

Slide6

Cost

Clearing/ Grubbing of land is roughly 25% of total costMaterials are most substantial part of costMaterials include concrete piping, grade inlets, manholes, and junction boxesGrade inlets consist of 5’ (Type C-1) & 10’ inlets (Type C-2A) combined to reach optimal length neededEngineering -15%Contingency -15% - Based on current bid prices

Slide7

Summary and Conclusion

Purpose: Safely carry storm water from all areas of the subdivision to the proposed outfall at Gum Gulley Creek (southeast of the area) while preventing erosion at the outfall or downstream. 7 drainage areas contributing to 7 junctions (2 inlets per junction)12-20ft inlets (drainage areas equal to ~ 4.0 acres); 2-15ft inlets (drainage areas equal to or slightly greater than 2.4 acres)Safe velocities, slopes, and backfill due to Harris County requirements (3-8ft/s, 0.13%, 3ft)Pipe size increases based on flow capacity coming through inlets18” – 2881 linear feet24” – 1265 linear feet30” – 847 linear feet

 Inlet Size (ft)Inlet Capacity Q (cfs)Ci (in/hr)tc (min)A (acres)Q (cfs)103.50.46.76101.293.5156.50.46.76102.406.520110.46.76104.0711

Table 1.

Alloted

Drainage Area per Inlet Capacity

Slide8

Questions?


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