I am looking at designing countermeasures for scour at a vertical wall bridge abutment. I am looking at the equations in Hec 23 and I am a little confused. There are 2 equations to determine the required D50 of the rip rap. If the Froude number is less than 0.8 then this equation is to be...
My firm was recently hired to inspect a sewage diversion structure that had been deteriorated due to exposure to hydrogen sulfide. We inspected the tank and found that about 1" to 2" of concrete could be easily removed and underneath we found a white pasty substance. This seems to be...
I am designing a retaining wall which will rest on rock. The resultant eccentricity is required to be within the middle half of the footing. The calculated resultant is outside the middle third, but inside the middle half. This causes the bearing pressure q(min) to be negative in the equation...
