I have got a SewerGEMS network of a Sewerage Scheme for a Town. The Town is divided into 38 Wards having different Population Densities in (Population/Hectare). There is a AutoCAD drawing showing the Ward Boundaries with the Number for each Ward. I also have a separate Excel Sheet having the 2 Columns specifying Ward Numbers and Population Density for each Ward (Population/Hectare). I have generated the Thiessen Polygons for the 4380 Manholes in the Network specifying a Buffering Percentage only (i.e. No Separate Ward Boundary Used) . Now I want to distribute/assign the population to each manhole base on the thiessen polygon generated. I also have shapfile having attributes of Ward No., Population density.
Please suggest me which method of load builder is suitable for distribution of population based on thiessen polygon? and How I proceed further with suggested method?
I recommend you to use, "Load Estimation by Population" method under 'Population/land use data' option in the Load Builder. (see snapshot below)
You will need a 'Population Density Type' Field. For this I recommend you to categorize ward population density as 'low', 'med', 'high', etc. or the as per the design standard used by the utility. (see below)
- Select the Thiessen polygon as the 'Service Area Layer'. Select the Population layer, density type field, density field and its units accordingly. You may have different sanitary load considerations for different wards depending on the ward density. If not, enter the sanitary load per capita per day as shown above.
Please consider reading these posts for more details:https://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/19895.distributing-loads-based-on-areas-of-different-population-type