As expected, the number of wells included in the water main network increased given a larger budget. Money left over after the water main network was created varied between budgets, producing different time lengths over which the truck-cistern network could operate. In general, higher budget scenarios assigned more locations to the water main network while increasing residual budget, allowing for the truck-cistern network to operate for a longer amount of time in these scenarios.
Budget 1: $26,000,000
A water main network analysis using the first proposed budget produced a network that encompassed one of the six defined groups (Group 5), servicing 254 of the 1304 total study area locations at a cost of $19,022,600. What remained of the $26,000,000 budget after subtracting the cost of the water main network ($6,977,400) was then used to compose a truck-cistern network to service the remaining 1050 locations. The remaining wells require 3, separately operating truck-cistern routes to be established at an up-front cost of $600,000 and an annual operating cost of $336,898, including truck maintenance and driver salary. Given the remaining budget the routes will operate for approximately 19 years before the initial budget is exhausted. The final, multi-modal network produced from this analysis services all defined locations within the study area for 19 years (Figure 5), during which time more funding is expected to allow for the establishment of water main routes within each of the remaining groups.
Budget 2: $42,000,000
Given a budgetary restriction of $42,000,000, two of the defined groups (Groups 5 and 4) were included as routes in the water main network. The total network cost of $33,563,900 provided water via water main to 448 locations. The remaining 854 locations require 3 trucks at an operating cost of $274,011 per year. The leftover $8,436,100 would satisfy these requirements for approximately 26 years (Figure 6). As stated in the previous scenario, funding dedicated to this project during this time period will allow for the remaining groups to be included in the water main network.
Budget 3: $75,000,000
The third budget of $72,000,000 allowed for locations defined by Groups 5,4,1, and 3 to be included in the water main network. The cost of building the network totalled $67,595,000 and serviced 869 locations. The residual budget of $7,405,000 was used in the production of two truck-cistern routes (as opposed to three in each of the previous scenarios) to service the remaining 435 locations. Due to the decrease in number of routes required by the truck-cistern routes, upfront and operating costs totalled $400,000 and $139,572 per year, respectively, allowing for the network to service the designated locations for approximately 50 years (Figure 7). Over these 50 years, all wells currently on the truck-cistern network will be connected to the water main network given additional monetary support.
Budget 4: $120,000,000
As previously stated and considered in the cost per unit length of pipeline defined in this study, the final budget of $120,000,000 enabled all 1304 locations within the study site to be included in the water main network. The total cost of this network was $104,187,800. A decrepency between the total length of the roads layer and the length of the network that connected all points to the treatment plant in this budget scenario is the reason as to why this network did not use up the entire budget. (Figure 8).