Upgrading of Aston – Ntuha road 1.4km in Masindi Municipality
This report consists of activities of design and construction for Aston Ntuha road (1.4 Km) in Masindi Municipal Council Central Division upgrading from gravel to paved standard. The major objective of the projects is: • To carry out a flexible pavement design by collecting data on traffic, hydrology, geotechnical, topography, environmental impact assessment and socio-economic activities. • To carry out drainage design • To provide cost estimate and economic analysis • To carry out social and Environmental analysis of the project • Project Implementations and commissioning • Operation and maintenance From the results obtained, the Average Daily Traffic was 926veh/day an equivalent of 613PCUs/day. This therefore necessitates an upgrade of this road. Saloon cars had the largest percentage of 75% followed by Pickup and Vans with 13%, Mini and Medium buses with 6%,Light trucks with 4.7% , Medium trucks with 0.6% while large trucks and heavy trucks were the least with 0.5%. The subgrade strength was found to be S4 and Traffic class of T4 with CBR ranging from 8-14 % as summarized in table. Land acquisition: Relocation of utilities new installations have already been done. Earth works under national water as sewage pipe lines and water supply distribution lines have reinstalled respect to road construction works. Programme of works: The contractors works programme (approved by engineer on 25th May 2017) is under use as basis for monitoring progress of works . There aren’t contract variations which could arise to changes in planned contract durations. Cash flow A cash flow forecast has been projected by the contractor indicating that 200million shall be available in respect to the approved work programme . This indicating no capital lock up shall occur during implementation of the project. Environmental Concerns: The Environmental and social management plan was submitted to Masindi Municipal Council after review by NEMA and world bank team , it was advised that the contractor prepares and submits his comments for approval. At the end of the pavement, geometric and drainage design of Aston Ntuha road was undertaken through traffic counts, in-situ sub-grade tests, topographic survey and hydrologic analysis. The design life of 15 years was considered basing on the reliability of the design data and the importance of the road. The combination of the traffic class and the sub-grade strength class of the road was used to obtain the required carriage-way, lane and shoulder widths and the thickness of the pavement layers. Pavement Design: The ADT showed that the road was due for upgrading considering the Ministry of Works and transports’ criterion for upgrading a road in an urban setting with more than 300 vehicles/day. Using the data obtained as outlined above and recommended methodology, the final design of the pavement was accomplished. The pavement designed had to fulfill the desired attributes of providing the required comfort and safety to the road users. The thicknesses designed for the pavement layers were; double surfacing dressing (1st seal 20mm aggregates and 2nd seal 14mm), 150mm granular road base and granular sub-base of 176 mm. The road section is to have a 6m carriageway and 1m shoulder widths while the drainage system consisted of 300mm base width trapezoidal sub - surface channels and 600mm diameter concrete culverts.