ADESIGN METHOD FOR AGRICULTURAL ROADS

Abstract

Roads are an important means of developing new areas and are increasingly required for convenient movement of people and their products to the markets. The main objective of this study is to design low cost agricultural road. The research area is the southern section of Alselate agricultural scheme(Nile East Province) To achieve this aim the two design's parameters, the traffic volume and California Bearing Raito(CBR) were carefully investigated and analyzed The study results shows that the traffic counts has been generated only to high light on the mode by which the products of the scheme's is transported to the markets and it also shows that the normal traffic can be estimated along the design period of road when the production of various type of crops of the scheme at the year 2008 that the study was generated is known. The expected production of the rest area was used to predict the generated traffic , the growth rate has been estimated from the discrepancies of the production of recent five years starting from the study year. The study shows that to generate the laboratory California Bearing Ratio(CBR) test Six samples were taken randomly from the vicinity of the Alselate scheme of existing sub-base road of six km long. The analysis process of the data in this study was carried out by the using Microsoft Excel software. The study shows that the design California Bearing Ratio(CBR) is the lowest value of the American asphalt institute or Tanzanian method of determination the 90%-ile CBR . The Structural design method used in this study is TRL Road Note 31. The study shows that the economical and cheaper material cost design option should be accepted . The study recommends that for design of the farm to markets roads, the farms production analysis is ideal method to predict the traffic volume and the growth rate.