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If you still have this problem, i suggest that you copy all the entities from your file to another file. Then purge the file.

In the projects which I have worked on, we usually use 32mm for single lots, 64mm for several lots, 64mm for pubic lots (school,..). I think that 80mm is more than enough. You can check how much flow you can get through a 80mm pipe, with max. headloss gradient 15m/km, max. velocity 1 m/sec; then...

Nowadays, we are using HDPE lining

Usually I design san network using excel spreadsheet. It is easy to prepare. Also, you can check your network using SewerCad

I think that the best design is to install ARV at high points. If there is a fire hydrant at high points, I suggest to move them and put ARV. In case you have a house connection at high point, then it wis not necessary to put ARV.

I was asked to design septic tanks for several homes in the village. How can I size it? Any special criteria are needed for the design of septic tank in restaurants, universities?

May anyone provide me with a free software to use it in the calculation of hydraulic profile in sewage treatent plant?

I suggest that you size your pipes based on the design criteria that you are working on. I have noticed that your values are relatively high. Usually we size a pipe for a max. velocity 2.5 to 3m/sec and max headloss gradient 15 to 20 m/km. then you will get the friction losses. Add the friction...

I think that your client is right. The best way is to have ny one layer with the required thickness. Otherwise, you should make special treatment such that the two layers work as if they are 1 layer.

Closed loop has many advantages than dead end. In closed loop: 1) The diameter of the pipes will be smaller 2) You will avoid the sedimentations and the decay of chlorine that occur at the end of pipe in dead end system. 3) The network will be more flexible for maintenance and operation 4)...

I think 0.5m space between the max. water level and the bottom of the pipe is sufficient. I saw several tanks constructed in this way.

How much is the C value for HDPE & GRP pipes?

you can use InfoWater, it works under GIS and i think it is better than Haestad Methods since you can use d"IifoWater Demand Allocator" which calculates the demand at each junction, also you can use it to caculate the elevations of the junctions by creating a 3D surface. But Watercad is more...

What is the C (Hazen William coefficient factor) for: 1) New Ductile iron pipe= 2) Old Ductile iron pipe(10 years old)=

I am designing the water network for a university (25,000 students). The university consists of classs buildings, sports areas, dormitories, cafeteria and sewage treatment plant. How much is the water consumption per capita per day and what is the diurnal pattern for each use.