slope of a drainage pipe ethiopia

Highway Drainage Manual Design Guidelines

Highway Drainage Manual Design Guidelines Issued: Septeer 1, 2009 Culverts page 2 of 14 Updated: • All pipe outfalls shall be protected from scour. • Transverse pipes may not be smaller than 18 in. diameter (or equivalent). Where the length of pipe exceeds 60 ft, the minimum diameter is 24 in.

Concrete Culvert, Irrigation or Drain Pipe - USDA

CONSTRUCTION SPECIFIION Concrete Culvert, Irrigation or Drain MT-108-1 USDA-NRCS-Montana March 2014 Concrete Culvert, Irrigation or Drain Pipe. 1. SCOPE . The work shall consist of furnishing and installing concrete pipe or concrete drain tile and the necessary fittings as shown on the drawings. 2. MATERIALS . Concrete Pipe

Salient Drainage Design Aspects for Roads & Highways

A minimum longitudinal drainage gradient is most preferable; A minimum longitudinal drainage gradient of 0.3% is adequate. Pavement Cross Slope/ Caer. In geometric design pavement cross-fall or caer could be made to slope either on one side or on both sides with a …

Drainage system (geomorphology) - Wikipedia

Parallel drainage patterns form where there is a pronounced slope to the surface. A parallel pattern also develops in regions of parallel, elongate landforms like outcropping resistant rock bands. Tributary streams tend to stretch out in a parallel-like fashion following the slope of the surface.

Drainage Failure: Cause and RepairStructural|Engineer

Subsurface Water Drainage Option B. Subsurface water drains are appropriate to control surface water runoff. They may consist of a perforated pipe placed in an aggregate filled trench (“French Drain”) along with an optional filter fabric to prevent pipe stoppages. The pipe should have a minimum slope of 1% to the surface outfall.

Hydraulic Design Manual: Hydraulic Grade Line Analysis

If the upstream conduit is on a mild slope (i.e., critical depth is lower than uniform depth), set the starting Hydraulic Grade Line for the next conduit run (HGL ds) to be the higher of critical depth and the Hydraulic Grade Line from step 3 (or 4 if minor losses were considered).


• The estimated water supply coverage for Ethiopia is 34% for rural and 97 % for urban and the country’s water supply coverage 44%. • Access to water-supply services is defined as the availability of at least 20 litres per person per day from an "improved" source within 1 kilometre of the user''s dwelling.

Drainage system - definition of drainage system by The

Define drainage system. drainage system synonyms, drainage system pronunciation, drainage system translation, English dictionary definition of drainage system…

PART B - Research4CAP

Drainage Interception and removal of ground water and surface water by artificial or natural means. Drainage Pipe An underground pipe to carry water. Drift or Ford A stream or river crossing at bed level over which the stream or river water can flow. Earth Road See ENS. Eankment


The lining and coating for ductile iron pipe shall meet the following requirements: The interior of the pipe and fittings shall be cement mortar lined with bituminous seal coat in accordance with ANSI/AWWA C104/A21.4. The exterior of all pipe and fittings, unless otherwise specified, shall receive a standard bituminous outer coating.

Drainage Criteria Manual -

of drainage systems within the IH 635 corridor. 1.2 SCOPE This manual presents various appliions of accepted principles of surface drainage engineering and is a working supplement to the information obtained from standard drainage handbooks and other publiions on drainage.


xxi) TCS-15 : 2-lane Bridge approaches Left side fill slope and right– side Retaining wall (New Alignment) The Bridge Sections are shown in Fig. 5.1to 5.3 and typical Cross Sections for Bridge Approaches are shown in Fig. 5.2 to 5.20. KD5: Final Fea sibility Report

Drainage Net and Geosynthetics Manufacturers, Suppliers

Drainage Net, also called Composite Geonet, is a two or three-layer three-dimensional drainage geosynthetic product which are often made with polypropylene PP or regenerated HDPE (geonet) and covered with double-sided thermally heat-bonded nonwoven geotextile on both sides or one side.


Roads will affect the natural surface and subsurface drainage pattern of a watershed or individual hillslope. Road drainage design has as its basic objective the reduction and/or elimination of energy generated by flowing water. The destructive power of flowing water, as stated in Section 3.2.2

Chapter 7 Drainage Structures, Sewers and Conduits

Chapter 7 Drainage Structures, Storm Sewers, Sanitary Sewers, Water Mains, and Conduits 7-01 Drains When installing perforated drain pipe, the perforations should be in the lower half of the pipe. This will minimize infiltration of fine material and ensure longer service.

Highway Drainage Design, Highway Drainage Structures

It is more appropriate to take care of drainage at the time of loion survey. Ideal loion fro a drainage stand point would lie along the divides b/w large drainage areas. Then all streams flow away from the highway, and the drainage problem is reduced to caring for the water that falls on the roadway and back slope.

The Importance of Proper Drainage Systems

Things to Know About Surface Drainage. In terms of surface drainage, slope is the most important thing to consider. For efficient drainage to occur, paved surfaces should have at least 1% slope. Any landscaped or turf areas should have at least 2% slope. Because slope is so important, a level is good to have on hand to measure it.

Geocomposite for drainage - MacDrain® W | Maccaferri Africa

The range of Maccaferri drainage geocomposites is called MacDrain. MacDrain geocomposites are made from a plastic drainage core that is thermally bonded to a geotextile, on one or both sides, or to a waterproofing layer, on one side. They are capable of providing one or more main functions: filtration, drainage, separation, barrier and protection.

PE Siphon Drainage Ball Stone Pipe Fittings products

China PE Siphon Drainage Ball Stone Pipe Fittings products offered by XUMING INDUSTRY CO.,LIMITED, find more PE Siphon Drainage Ball Stone Pipe Fittings suppliers & …

Drainage Failure: Cause and RepairStructural|Engineer

Subsurface Water Drainage Option B. Subsurface water drains are appropriate to control surface water runoff. They may consist of a perforated pipe placed in an aggregate filled trench (“French Drain”) along with an optional filter fabric to prevent pipe stoppages. The pipe should have a minimum slope of 1% to the surface outfall.

Assessment of the Effect of Urban Road Surface Drainage: A

Drainage is one of the most important factors to be considered in the road design, construction and maintenance projects. It is generally accepted that road structures work well and last longer to give the desired service. When a road fails, whether it is concrete, asphalt or gravel, inadequate drainage is often a major factor to be considered.


The pipe slope drain shall outlet into a sediment trapping device when the drainage area is disturbed. A riprap apron shall be installed below the pipe outlet where water is being discharged into a stabilized area. Construction Specifiions 1. The pipe slope drain shall have a slope of 3 percent or steeper. 2.

Chapter 8 HIGHWAY DRAINAGE Revision 91 (Limited Revision

Highway drainage is an important consideration in the design of many projects. The term drainage is defined in several different ways, including the process of removing surplus groundwater or surface waters by artificial means, the manner in which the waters of an area are removed, and the area from which waters are drained.

Pavement Drainage Essentials - BUILDINGS

The nuer one cause of premature pavement failure is poor drainage of the pavement surface, subbase, or subgrade. Reduce your risk of premature pavement failure by installing an underdrain system. All pavements, whether they are asphalt or concrete, rely on a solid base. This assures that the

7 CULVERTS 7.1 Introduction -

Drainage Design Manual – 2013 Culverts 7 CULVERTS 7.1 Introduction Cross drainage involves the conveyance of surface water and stream flow across or from the highway right of way. This is accomplished by providing either a culvert or a bridge to convey the flow from one side of the roadway to the other side or past some form of flow

4. Components of road drainage system - ROADEX Network

4.1. General The primary purpose of a road drainage system is to remove the water from the road and its surroundings. The road drainage system consists of two parts: dewatering and drainage. “Dewatering” means the removal of rainwater from the surface of the road. “Drainage” on the other hand covers all the different infrastructural

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