## Hydraulic calculation storm sewer network using the Rational method

## Hydraulic calculation storm sewer network using the Rational method

(OP)

Hello!

1. I would like to ask a question about the slopes that are used in the hydraulic calculation of rainwater networks. As far as I understand, the estimated bias of the rainwater drainage network can be accepted by anyone, provided that it provides Vfull>Vmin and Qfull>Qdes For example, 0.001; 0.0015; 0.002; 0.0025; 0.003; 0.0035; 0.004; 0.0045; 0.005 and so on. Or even 0.0011; 0.0012; 0.0013; 0.0014; 0.0015; 0.0016; 0.0017; 0.0018; 0.0019 or 0,0035; 0,0036; 0,0037; 0,0038; 0,0039; 0,0041 i.e. a finer ranking than in the example above. That is, modern equipment during the construction of the network can provide such a small ranking (0,0014; 0,0015; 0,0016) and can create any slope of the pipe?

2. And as far as I understand, is the maximum maximum rainfall rate in the rainwater drainage network 12 feet per second?

1. I would like to ask a question about the slopes that are used in the hydraulic calculation of rainwater networks. As far as I understand, the estimated bias of the rainwater drainage network can be accepted by anyone, provided that it provides Vfull>Vmin and Qfull>Qdes For example, 0.001; 0.0015; 0.002; 0.0025; 0.003; 0.0035; 0.004; 0.0045; 0.005 and so on. Or even 0.0011; 0.0012; 0.0013; 0.0014; 0.0015; 0.0016; 0.0017; 0.0018; 0.0019 or 0,0035; 0,0036; 0,0037; 0,0038; 0,0039; 0,0041 i.e. a finer ranking than in the example above. That is, modern equipment during the construction of the network can provide such a small ranking (0,0014; 0,0015; 0,0016) and can create any slope of the pipe?

2. And as far as I understand, is the maximum maximum rainfall rate in the rainwater drainage network 12 feet per second?

## RE: Hydraulic calculation storm sewer network using the Rational method

I thought 4m/s (13ft/s) was the limit to avoid internal erosion of concrete pipes. Again its been years since i have looked at a drainage design.

## RE: Hydraulic calculation storm sewer network using the Rational method

1) 0.001; 0.0015; 0.002; 0.0025; 0.003; 0.0035; 0.004; 0.0045; 0.005 ranking through 0.0005 (that is, it is possible to set the slope multiple of 0.0005 during the calculation)??????

2) 0,0011; 0.0012; 0.0013; 0.0014; 0.0015; 0.0016; 0.0017; 0.0018; 0.0019 ranking through 0.0001 (when calculating, it is possible to accept any slope)??????

!!!!!I'm interested in what slope values can be taken when designing sewage networks!!!!

## RE: Hydraulic calculation storm sewer network using the Rational method

## RE: Hydraulic calculation storm sewer network using the Rational method

All i know is that i see too many digits after a decimal point....

## RE: Hydraulic calculation storm sewer network using the Rational method

Also, construction issues arises due to specialized tool - Laser level - required to install the pipe. The contractor will have a difficult effort staying within specified tolerance (+/-), especially when the length of the pipe is more than 50-ft.