Drainage is the process of interception and removal of water from over, and under the vicinity of the road surface. Drainage can be surface (where water is conveyed on the road surface and drainage channels), or subsurface (water flows underneath the pavement structure).
Surface and subsurface drainage of roads critically affects their structural integrity, life and safety to users, and is thus important during highway design and construction. Road designs therefore have to provide efficient means for removal of this water; hence the need for road drainage designs.
Drainage facilities are required to protect the road against damage from surface and sub surface water. Traffic safety is also important as poor drainage can result in dangerous
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A = the catchment area in km2 HYDRAULIC DESIGN
Once the design runoff Q is determined, the next is the hydraulic design of drains. The side drainage and other structures are designed based on the principles of flow through open channels.
If Q is the quantity of surface water (m3/sec) to be removed by a side drainage and V is allowable velocity of flow (m/s) on the side drainage, the area of cross section A of the channel (m2) is found from the relation below: Q=A.V
The velocity of unlined channel must be high enough to prevent silting and it should not be too high as to cause erosion. The allowable velocity should be greater than one (1m/sec) for lined channel.
The slope S of the longitudinal drain of known or assumed cross section and depth of flow ,may determined by using Manning’s formula for the design value of velocity of flow V, roughness coefficient n and hydraulic radius R.
Manning’s Formula V=1/n*R2/3*S1/2
Also, roads and airstrips are being built on gravel pads which are drained so that the ice cannot develop and frost levels will not alter. Further, cars in garages or parked outside are plugged into electricity supply to stop the battery from running and the petrol and oil from freezing. The roofs of buildings are steep which allow the snow to slide off and the building material is lightweight and wooden and the windows are triple glazed. Further, oil storage tanks are built on stilts which keep the oil heated and prevent it from freezing. Also, Utilidor, which are steel frames with aluminum panels heated by steam are used to prevent heating and protect fibrous
Rivers change the shape of the earth by eroding away sediments of the earth's surface. There are four different types of erosion created by rivers: hydraulic action, abrasion, attrition and solution. Hydraulic action is when the river bank is weakened by the velocity of the river, which allows air to enter small breaks in the river bank, and the bank slowly erodes away. Abrasion is when the bed and bank of the river is worn away by rocks carried by the river. Attrition is when rocks in the river forcefully hit each other and create smaller sediments.
When our new DVCs took over and had the town hall meeting, this issue was brought up. Is asking for volunteers and risking the safety our team members the guidance from our leadership? I live the furthest from anyone in the HB, and it has taken me hours to get here/get home on a few occasions due to unsafe road conditions. I have a 4x4 truck and I had to engage my 4x4 on a few occasions due to the unsafe road conditions.
Runoff, a common problem in many areas, has many causes. These causes, although sometimes avoidable,such as pollution, it can be repaired. As pollution and erosion, two of the main topics in this paper, affect the water quality, the agents aiding the processes are unstoppable. While agents are unstoppable, runoff is still controllable as far as the rate of runoff. When writing a paper such as this, the many information collected is shown in separate paragraphs, corresponding to the ideas.
The progressive era in the United States helped to spawn one of the first great conservative movements in the country. The conservative movement occurred as a result of the troubling theory that the fast paced urban development and industrial growth of the nation would lead to the extinction of wilderness areas in the United States. One of the most significant events during the era was that of the debate over the construction of the O 'Shaughnessy Dam in the Hetch Hetchy Valley located in California’s Yosemite National Park. After an earthquake crippled the city of San Francisco in the early 1900’s, the residents of the city recognized that they would require better-equipped ways to make certain that they had a steady supply of electricity and
In the winter, the river flows at about 1,700 cfs due to the glacial runoff and in the summer the flow decreases as the temperature increases. Since meandering channels form on low slopes, the velocity is low and must flow through easily eroded bedrock which would be low sediments. The strongest current is on the cut bank where the larger rocks settle and in the point bar, where the slowest velocity occurs, is where deposition of small sediment falls. The river has low energy and therefore is a wide valley where the energy is directed side by side and eventually forms the meandering
From: Mr.Jazayeripour the manager of Mojave Desert community to: The California Environmental Protection Agency Water is one of the necessary sources for organisms to survive in many ways. and did you know that (The United States uses about 346,000 million gallons of fresh water every day. allaboutwater.org-water.facts ) Mojave river, colorado river and underground water are the main sources of water for animals, plants, residential, industrial and agricultural uses. ground-water depletion is primarily causes by sustained groundwater pumping.
The installation of sewer systems, street sweeping, regular garbage pickup, and better street lighting. Having to put
Conversely, directness was moderately correlated with safety, which is intuitive given that enclosed communities have lower traffic flows as well as speed limits that are conducive
The Monroe County and Petaluma Watershed are different in ways that which affect the health of the watershed. Pollution, location, and use are all important aspects to consider when observing watersheds. The pollution and location will affect the health of the watershed and the nature around it. This affects what the watershed is used for like biodiversity and general water uses. Watersheds are important to nature and are a very big water source.
Also, for the safety of other motorist driving on the highway. Based on
They also include the replacement of undersized structures such as bridges. These works are necessary, as the original channels have become undersized as a result of the increase in flood flows caused by development. Flash flood also can be overcome with storage ponds of flood attenuation. Ponds such as disused mining pools can be used for flood storage. The objective is to divert the flood water through such ponds and thus regulate the outflow so that the flood peaks are attenuated.
2.8 Main Cause of Flood According to Jabatan Penerangan Malaysia (2012), issues of flood that happen certainly had their own causes. There are many causes such as: 2.8.1 Continuous Rain Continuous rain without stopping can cause flooding. In low areas, rain water will flow into the river. River filled with water will overflow causing lowland area are flooded.
departments (e.g. digging of roads by telecom/ dihydrogen monoxide dept. and leaving it open for eons) Traffic congestion has a number of negative effects: • Wasting time of motorists and passengers ("opportunity cost"). As a non-productive activity for most people, congestion reduces regional economic health.
A good stretch of road will require sufficient drainage, good time and space management, and of course a huge emphasis of the safety aspect of the structure. It is up to the construction manager to make sure all these objectives are achieved, as well as trying to save money where possible to increase profit on the project. Time, money and resource management are of utmost importance to the manager. Techniques to building a road: Asphalt. Building a road using asphalt material is perhaps one of the most common approaches taken to building a road/highway.