Recent content by ropotto

I believe that it is a confusion in terms, Airport Mix is a term used for crushed stone with stone dust in some regions. BLUESTONE AIRPORT MIX CRUSHED STONE, DIRT & CLAY FOR DRIVEWAYS WHITE AIRPORT MIX CRUSHED STONE FOR DRIVEWAYS THAT COMPACTS

I was told that Airport Mix is crushed stone with stone dust, sand and silt that compacts and is generally used for used as base material or on driveway applications.

What is known as airport mix? Is it Concrete?

I should maybe explain the differences between crushed stone and dense grade aggregate. Crushed stone is sedimentary rock that has been crushed and graded by screens to certain size classes. Crushed stone may also be made from granite and other rocks. Dense grade aggregate, or DGA, also known...

What granular sub-base material placed on top of the prepared subgrade is the best cushion for uniform support by bridging over minor subgrade defects for sidewalk construction? 3/4" Dense Graded Aggregate or 3/4" Crushed Stone? Is the use of crushed stone a better way to diminish the...

Does anyone know about Asphalt and Fuel Price Adjustments for New Jersey DOT When using the Asphalt and Fuel Price Adjustments for estimating purposes can be calculated with the Fuel and Asphalt Price Adjustment Spreadsheet. The DENSE GRADED AGGREGATE BASE COURSE, 6" THICK (SY) has a G value...

Many specifications require all castings shall be carefully coated, inside and out, with coal-tar-pitch varnish. Asphaltic base paints contain organic compounds (VOC), which evaoprate and contribute to air pollution. In order to comply with US EPA regulations, many casting companies have...

I found the attached document in the Technical Notes on the ADS Pipe Website. http://www.ads-pipe.com It covers the underground pipe systems that are subject to flotation and how to proper install and/or anchor pipe in these situations. This document provides an analysis on minimum cover...

Hi All, I am currently working on Subsurface Detention\Retention Bed that is located on property in the 100-yr. floodplain. The reviewing Engineer has requested calculations for assurances the facility is designed to resist floatation during a 100 yr. storm event. Please can anyone advise me...

Equations for hydraulic jump in horizontal rectangular channel (Chaudhry, 1993; Chow, 1959): V=Q/(yB) F=V/(gy)0.5 y2/y1 = 0.5 [(1+8F12 )0.5 - 1] L = 220 y1 tanh[(F1-1)/22] h = (y2-y1)3 /(4y1y2) where: B=Channel width (m), F=Froude number (dimension-less), g=acceleration due...

The discharge for a circular orifice is 1/2 Q = C a (2gh) Where: C=Discharge coefficient a=Submerged area g=Gravitational constant h=Effective head Vertical Orifice For an orifice opening in a vertical plane, the effective head is given by: h=H-max(r,TW) (if...

What is the best way to provide underground stormwater with a high groundwater table?

I talking about larger storm, such as 50 & 100 yr. The flooding source is a river. The flood depth at the structure would two (2) feet more or less.

Does anyone know where I can find some design standards for flood-proofing of saniatry sewer line. To prevent flood water from elevating the system, to prevent cracks, leakage, and vegetation getting inside.

What are the pros and cons of placing a stormwater runoff control facility within a floodplain? ie, such as an infiltration bed.