drainage pipe velocity in botswana Despriction

(PDF) Slurry Pipeline Design of Multi-sized Solids

In order to examine the influence of pipe size, concentration, the hydraulic gradient velocity characteristics, the slurry was transported in pipes of 16, 18 and 20 inches in diameter at

11.12 Hydraulic Grade Line 11.12.1 Introduction

The analyses should include any additional drainage area that the outfall receives between the storm drain outlet and the receiving waters. 11.12.3 Exit Loss The exit loss is a function of the change in velocity at the outlet of the pipe. For a sudden expansion such as an endwall, the exit loss is:(11.19) Where:V = average outlet velocity, m/s APPENDIX F STORM DRAINS 1 - OregonStorm drain system design begins after inlet capacity and spacing (Appendix D) have been determined. Then, on a drainage system map, the connecting pipes, access holes, direction of flow, outfall location, existing drainage features and any necessary horizontal/vertical adjustments to avoid existing utilities would be documented. CHAPTER 7 ROAD STORM DRAINAGE SYSTEMSspacing, pipe sizing, and hydraulic grade line calculations are included. In the design of an enclosed drainage system, it is necessary to have complete and accurate information regarding the existing drainage system. Before an existing storm sewer can be used to drain a new roadway or improvement, its size, location, structural


drainage to and from the cross pipe, while avoiding excessive volume or velocity of water discharged onto. private property. In some cases, it may be necessary for PennDOT to perform work outside of the right-of-way. Section 8.3 describes this procedure. CHAPTER 8 DRAINAGE AND DRAINAGE SYSTEMSdrainage to and from the cross pipe, while avoiding excessive volume or velocity of water discharged onto. private property. In some cases, it may be necessary for PennDOT to perform work outside of the right-of-way. Section 8.3 describes this procedure. Chapter 10 CULVERTSFigure 10.3-C CM PIPE MAXIMUM ALLOWABLE DEPTH OF COVER.. 10-13 Figure 10.3-D CM ARCH PIPE MAXIMUM ALLOWABLE DEPTH OF COVER .10-14 Figure 10.3-E SPACINGS FOR MULTIPLE CONCRETE PIPES (Wide Streams/Undefined Streams) ..10-17 Figure 10.3-F SPACINGS FOR MULTIPLE METAL PIPES

Chapter 6 Storm Sewer

5. Velocity:The design velocity for storm sewers shall be between 3 to 10 feet per second. This velocity is calculated using Mannings equation, under full flow conditions even if the pipe is only flowing partially full with the design storm. The minimum slope required to achieve these velocities is Chapter 8 HIGHWAY DRAINAGE Revision 91 (Limited Highway Drainage" (Chapter 5 of the "Highway Drainage Guidelines") and "Legal Aspects" (Chapter 2 of the "Model Drainage Manual"). 8.2.1 State Drainage Law State drainage law is derived from common law based on two historical lines of thought:the old English common law rule ("common-enemy rule") and the "civil law rule". Designing a subsurface drainage systemTopographical constraints typically determine pipe grade, so the pipe size is determined after the material is selected (e.g., corrugated polyethylene pipe, smooth interior pipe, etc.). Flow velocity Besides flow capacity, design drainage systems to provide a certain minimum velocity of flow so it self-cleans or self-scours.

Drainage and Stormwater Management

Minimum size - cross road pipe / culvert Minimum size - storm drain 18 in 15 in Minimum full flow velocity 3.0 ft/s Maximum outlet velocity (determined by design parameters) Based on scour, erosion, risk potential of discharge channel, and mitigating measures such as energy HDPE Pipes & Fittings - Flo-Tektrading as Flo-Tek Pipes & Irrigation was established in Botswana in 1998 manufacturing PVC pipes. In July 2003 and June 2004 Flo-Tek commenced manufacturing rotational moulded products and HDPE pipes, respectively. The company was established in South Africa in 2005 and an HDPE pipe factory was started in Clayville in August 2007. Flo-Tek South N-12® Dual - HDPE Drainage Pipe Drainage Pipes from ADSADS Dual Wall N-12 drainage pipe, available with multiple joining systems, provides corrugated-pipe strength and smooth interior wall hydraulics for increased flow capacity, in a lifetime package. N-12 Dual Wall Specifications. Plain End:Soil Tight (STIB) Water Tight (WTIB)


such as plastic pipe, steel pipe, aluminum pipe, corrugated metal pipe, or ductile iron pipe, shall be designed using NRCS National Engineering Handbook (NEH) Part 636, Chapter 52, Structural Design of Flexible Conduits, and the following criteria:Smooth Wall Plastic Pipe. When operating at design capacity, the full-pipe flow velocity should Pipe selection PolicyCDOT PIPE MATERIAL SELECTION GUIDE Revised April 30, 2015 4 Cross Drain Side Drain Storm Drain Step II:Determine Abrasion Level An estimate of the potential for abrasion is required to determine acceptable pipe types and whether there is a need for invert protection. Precast Concrete Pipe DurabilityEffluent velocity, by itself, does not create problems for concrete pipe within the ranges normally encountered. Below velocities of 40 feet per second, the severity of velocity-abrasion effects depends upon the characteristics of the bed load and the frequency of flows capable of moving the bed load through the pipe at abrasive veloci-ties.

Section 10 Drainage Design - New Jersey

Drainage Design banks at flood stage. An area designated by a governmental agency as a floodplain. Fluvial Flood - A flood which is caused entirely by runoff from rainfall in the upstream drainage area and is not influenced by the tide or tidal surge. Pipe - A conduit that conveys stormwater which is intercepted by the inlets, to an Self Cleaning Velocity - Turf DrainSelf Cleaning Velocity in drainage manuals is stated as a minimum flow of 3 feet per second. At this flow rate, a pipe will be flushed of contaminants and remain open. The slope needed for a pipe to maintain this velocity is based on the Manning number of the pipe. This number calculates the friction as the result of wall construction and diameter. Steam Mains and Drainage Spirax SarcoProper pipe alignment and drainage means observing a few simple rules:Steam lines should be arranged to fall in the direction of flow, at not less than 100 mm per 10 metres of pipe (1:100). Steam lines rising in the direction of flow should slope at not less than 250 mm per 10 metres of pipe (1:40).

Subirrigation and Controlled Drainage - 1st Edition

Nutrient Contents in Drained Water from Pipe Drainage Systems, M. Borin, C. Giupponi, and P. Ceccon Environmental and Economic Impacts of a Recycling Subirrigation-Drainage System, S.W. Melvin and R.S. Kanwar Water Table Management Systems and Water Quality, D. Arjoon, S.O. Prasher, and J. hydrolics 2.docx - REPORT ON FLUID FRICTION The resistance to flow in a pipe is a function of the pipe length, pipe diameter, mean velocity, properties of the fluid and roughness of the pipe (if the flow is turbulent), but it is independent of pressure under which the water flows. BOTSWANA INTERATIONAL