The primary purpose of this study is to correlate serviceability or service life of plain galvanized corrugated metal culverts to the natural forces of corrosion or environmental conditions. Service life and how it is indicated is discussed. Data was obtained on approximately 340 corrugated metal culverts located on state and county highways during 1966 and 1967. Recommendations are made for the usage of plain galvanized corrugated metal culverts.
Herewith is a copy of the interim report covering a portion of the work performed on this research project in 1963, 1964 and 1965.
The report includes further observations regarding some of the materials covered in the 1962 Report, "Experiments on Seeding and Mulching for Roadside Erosion Control". A section on erosion basics is included to provide background knowledge on this important, and often costly natural process.
The mulch experiment, reported herein has resulted in the addition of another material (green wood excelsior) to the specifications. This new material is supplied in bales and applied like straw, but it does not require an asphalt tack.
Seeding trials, species trials and some soil sterilant studies are also reported. The species work has resulted in the inclusion of birdsfoot trefoil in most of the seeding mixtures in the new specification book and in a wider use of crownvetch on specific sites.
