1.If a contractor proposes to increase concrete cover beyond contractual specification (i.e. 40mm to 70mm), shall engineers accept the proposal?
2.What is the difference between “hammer efficiency” and “coefficient of restitution” when using Hiley’s formula in pile driving?
3.What is the difference between direct circulation drilling and reverse circulation drilling?
4.Electric power is expensive, piping were built long time ago, population has grown,demand exceeds supply of water. What is the best thing to do ?