A tentative study on the demand-supply management with the effect of house connection pipe and storage pumping system

摘要

Hydraulic design of pressurized water supply and distribution system generally is subjected to satisfy adequate consumer demand with minimum specified pressure within network. Available pressure and distribution of the flow to the consumer end are quite significantly affected by the house connection (HC) pipe, storage reservoir (including both the underground and roof tank) and storage type, pumping system and demand pattern. In addition, supply through a distribution pipe is also affected by the relative consumption behavior of all HCs connected with that pipe. Under the Dhaka Water Supply Sector Development Project (DWSSDP); Dhaka Water Supply and Sewerage Authority (DWASA) aims to develop a pressurized water supply and distribution system in Dhaka. This study investigates the change in supply pattern due to presence of above factors in between consumer and distribution network. Storage inflow variation due to change in HC pipe diameter and available pressure was analyzed. Again, effects of pumping rate on inflow-outflow of the both storages are determined for a typical consumption pattern. Adequacy of pumping schedule, pumping rate and HC pipe diameter to utilize storage capacity are also investigated. Simplified tentative analyses have been carried out for a single HC (a typical 10 storey building). Flow in HC pipe, storage behavior and peaking of demand are found to be affected quite significantly in the analyses. Finally probable effective combination of HC pipe and pumping system is analyzed to find optimum pressure-flow management.