Basic Hydraulics: Storm Water Management concepts
-
Upload
grant-leonard-sims -
Category
Documents
-
view
233 -
download
0
description
Transcript of Basic Hydraulics: Storm Water Management concepts
![Page 1: Basic Hydraulics: Storm Water Management concepts](https://reader035.fdocuments.us/reader035/viewer/2022062302/5a4d1b4e7f8b9ab0599a69c7/html5/thumbnails/1.jpg)
Basic Hydraulics: Storm Water Management concepts
![Page 2: Basic Hydraulics: Storm Water Management concepts](https://reader035.fdocuments.us/reader035/viewer/2022062302/5a4d1b4e7f8b9ab0599a69c7/html5/thumbnails/2.jpg)
Storm Water• Defined in Construction General Permit as
• Rainfall runoff; • Snow melt runoff; • Surface runoff and drainage.
• Defines in the HDM 13-2 as• Overland flow• Flow in ditches • Flow in storm drain
![Page 3: Basic Hydraulics: Storm Water Management concepts](https://reader035.fdocuments.us/reader035/viewer/2022062302/5a4d1b4e7f8b9ab0599a69c7/html5/thumbnails/3.jpg)
Storm Water Management• Structural (ditches, ponds, etc.) and non-
structural measures to • Control quantity (how much)• Arrival time (when)• Quality (how dirty)
![Page 4: Basic Hydraulics: Storm Water Management concepts](https://reader035.fdocuments.us/reader035/viewer/2022062302/5a4d1b4e7f8b9ab0599a69c7/html5/thumbnails/4.jpg)
Best Management Practices• Practices to mitigate quantity and quality issues• Processes• Street cleaning• Scheduling
• Devices• Detention ponds• Rock filter dams• Vegetative buffer
![Page 5: Basic Hydraulics: Storm Water Management concepts](https://reader035.fdocuments.us/reader035/viewer/2022062302/5a4d1b4e7f8b9ab0599a69c7/html5/thumbnails/5.jpg)
Best Management Practices• Water quality issues tend to dominate design practice.
• Practices need not be “devices”
• Construction activities
• Erosion control
![Page 6: Basic Hydraulics: Storm Water Management concepts](https://reader035.fdocuments.us/reader035/viewer/2022062302/5a4d1b4e7f8b9ab0599a69c7/html5/thumbnails/6.jpg)
Storm Drain Systems• EPA NPDES municipal separate storm sewer systems influence BMP
selection
• Edwards Aquifer Recharge Zone (TNRCC) also influences BMP selection
• Division of Environmental Affairs
![Page 7: Basic Hydraulics: Storm Water Management concepts](https://reader035.fdocuments.us/reader035/viewer/2022062302/5a4d1b4e7f8b9ab0599a69c7/html5/thumbnails/7.jpg)
Erosion Control• Turbidity (cloudiness) and Total Suspended
Solids are used as regulated parameters for Storm Water Management – Erosion control greatly influences these parameters
![Page 8: Basic Hydraulics: Storm Water Management concepts](https://reader035.fdocuments.us/reader035/viewer/2022062302/5a4d1b4e7f8b9ab0599a69c7/html5/thumbnails/8.jpg)
Erosion Control• Flat side slopes in channels, swales, etc.• Protection at culvert outlets• Berms and similar protective devices• Rock filter dams are temporary sediment controls that can be left in
place and eventually become a berm that self-seeds and provided hydraulic detention as well as vegetative buffering
• Ground cover selection
![Page 9: Basic Hydraulics: Storm Water Management concepts](https://reader035.fdocuments.us/reader035/viewer/2022062302/5a4d1b4e7f8b9ab0599a69c7/html5/thumbnails/9.jpg)
Erosion Control• Select route where erosion is unlikely• Design slopes flatter than required by soil considerations• Reduce area of unprotected soil exposure• Reduce duration of unprotected soil exposure• Protect bare soil with vegetative cover, mulch, erosion resistant
materials• Retard (delay) runoff with engineered devices (ponds)
![Page 10: Basic Hydraulics: Storm Water Management concepts](https://reader035.fdocuments.us/reader035/viewer/2022062302/5a4d1b4e7f8b9ab0599a69c7/html5/thumbnails/10.jpg)
Channels and Chutes• Surface channels to carry storm water with
minimal erosion – velocities are important
• Chutes (steep channels) carry water at high velocity – energy dissipation is vital
![Page 11: Basic Hydraulics: Storm Water Management concepts](https://reader035.fdocuments.us/reader035/viewer/2022062302/5a4d1b4e7f8b9ab0599a69c7/html5/thumbnails/11.jpg)
Quantity (How Much) Management• Storage• Delays arrival at a location
• Infiltration• Increases rate of water flow into soil
![Page 12: Basic Hydraulics: Storm Water Management concepts](https://reader035.fdocuments.us/reader035/viewer/2022062302/5a4d1b4e7f8b9ab0599a69c7/html5/thumbnails/12.jpg)
Hydraulics as pre–requisite • Generally the hydraulics of storm water
management is accomplished by various approaches discussed earlier in the course
• There is some added effort in velocity management (to control erosion) and sizing storage facilities