Influence of hydraulic properties on baffled stabilization ponds performance was studied. The hydraulic model was studied by tracer t e s t . From this t e s t , the Dispersion Number Index, d was evaluated for each of the five ponds at four different hydraulic loadings. The results of this f i r s t part of the study formed basis for the second pa... Continue Reading
The stress distribution of short Reinforced Concrete Columns was investigated via a study of their Load-strain relationship. The Principal variables under investigation were Hoop type and Hoop spacing. A total of twenty columns were tested; middle points of the columns, Modes of failure and ultimate loads were noted. The results show that strains a... Continue Reading
The sustenance of viable agriculture depends strategically upon the provision of adequate subsurface drainage. The goals of providing adequate aeration and salinity control in irrigated lands have been translated into a number of criteria upon which drainage systems are designed. A brief review of these shows that most criteria for design can be re... Continue Reading
The primary objective of this research was to develop and evaluate an acceptable instrument for field measurement of infiltration. Many situations arise in civil engineering, irrigation and hydrology where it is desirable to evaluate infiltration of water into the soil under either ponded or rainfall conditions. An example is in the prediction of t... Continue Reading
This project describes a procedure for estimating the design floods from regional frequency curves for ungauged areas drained by rivers Ogun and Oshun of Western Nigeria. Streamflow records at nine gauging stations were used for the study. For estimating purposes, two relations have been derived. The first relates graphically the mean annual flood ... Continue Reading
Fixed route and route-deviation are among the possible strategies of operating intra-urban transit. The route-deviation strategy requires vehicles to follow a basic fixed route and deviate from the route to offer doorstep service to passengers on request. Thus a combination of fixed route captive passengers and those desirous of doorstep service ar... Continue Reading
This thesis is a study of residual stresses in arc welded butt joints and the effect of joint geometry and electrode type on the stresses. Three joint designs, the single- v, the double - v and square - butt joints have been considered. Two filler rods selected for this study are E6012 and E6013 of the American Voiding Society (AWS) classification.... Continue Reading
In the existing design methods, consideration is given only on the stochastic process of flood flows imposed on the structure to account for hydrologic risk and the capacity of the structure is treated as deterministic. This thesis presents composite risk models which integrated hydrologic and hydraulic risks in the design of spillway structure. Bo... Continue Reading
A study of the evaluation of the performance of the Water Distribution system in the Kadawa sector of the Kano River Project was carried out by Jimoh, O.D. in 1991.He came up with siltation of the distributaries as one of the problems affecting the efficient water distribution system within the irrigation system. This study has thus examined the si... Continue Reading
This thesis presents the results obtained on the effectiveness of rubberlatex as a means of improving cement mortar performance. Mortar cubes of the two principal mix-ratios 1:3 and 1:6 were prepared and cured in ordinary moist environment and in an aggressive environment (untreated A.B.U dam water) for control strength and that of the defective cu... Continue Reading
The problem considered in this study is to deterministically and probabilistically evaluate the adequacy of the design methods of cold-formed structural steel beamcolumns having doubly-symmetric cross-sections in accordance with the AISI Specification of 1968 and ECCS Recommendation of 1987 with a view to proposing equivalent optimal criteria. The ... Continue Reading
The study investigates the effect of pigments as a tinctorial source of colour concrete (colour-crete) with the aim of assessing the dosage level required for an appreciable tinctorial strength for aesthetic purposes. The objective of the study is to produce an alternative to the usual practice of painting of concrete structures after rendering, by... Continue Reading
The nominal allowance for eccentricity due to construction tolerances as specified in three different codes of practice (ACI 318-77, CP 110, and CEB-FIP Model Code) was studied and compared with actual values of construction errors measured on building sites. It was found that the three specifications do not compare favourably with one another, nei... Continue Reading
The survival of faecal coliforms, faecal streptococci and of helminths in soil and crops irrigated with wastewater was studied between March and June in 1988. The results showed a more than 90% reduction in the counts of faecal streptococci by the 4th day and of faecal coliforms by the 6th day. Helminths, Stronqyloides stercoralis larvae and Mite w... Continue Reading
The results of pullout and compression tests of concrete subjected to a simulated aggressive chemical environment is presented. About one hundred and tour pull out test specimens and one hundred and fourteen cubes were tested for ultimate local bond strength after curing for one hundred and eight days in different aggressive media. Two of the simul... Continue Reading