A Value Engineering Study was performed by four State highway agencies (Michigan, Minnesota, West Virginia, and Wisconsin), covering various aspects of curbs, drainage structures, drainage castings, and gutters. Twenty-seven specific proposals are given for the consideration of highway agencies. To add credibility, a draft report was circulated to the members of the AASHTO Task Force on Hydraulics and Hydrology. Some of the proposals are: minimize cover over pipes, broaden specifications and standards, air entrained concrete, inlet frames with inward protruding flanges, high efficiency grates, eliminate ribs on manhole covers, eliminate adjustable manhole frames, minimize curb drainage, creative uses for slotted vane grates, provide designers with relative costs, reduce the number of standard grates, eliminate metal frames from concrete inlet boxes, standardize design of curbs and gutters, have only six standard curbs and gutters, minimize thickness of gutter pans, eliminate reinforcement in curbs and gutters, specify batter, minimize tight specifications, increase hydraulic capacity of gutters, use curbs to minimize right of way, and avoid oversized drainage inlets.
This edition of Hydraulic Engineering Circular No. 12 incorporates new design charts and procedures developed from laboratory tests of interception ca...
The goal of this project is to investigate the hydraulic efficiencies of Type 13 (bar inlets), Type 16(vane inlets), and Type R (curb-opening inlets) ...
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