How will you decide the capacity of elevated service reservoir?
Analytical method • capacity of the reservoir is determined from the net inflow and demand. storage is required when the demand exceeds the net inflow. the total storage required is equal to the sum of the storage required during the various periods.
How do you determine storage capacity of a reservoir?
The variable St is calculated by the following equation: St = | St-1 + Rt – It | 0 if negative or zero if positive (1.2) The required storage capacity is equal to the maximum of St values. Example 1.1: A reservoir is to be constructed at a location where monthly flow data are available for 28 months.
What is storage capacity of reservoir?
Reservoir Capacity means the gross volume of water which can be stored in the reservoir. “Dead Storage Capacity” means that portion of the Reservoir Capacity which is not used for operational purposes, and “Dead Storage” means the corresponding volume of water.
What is elevated reservoir?
Elevated Reservoirs: When sufficient high ground above the distribution area is not available for the construction of ground reservoirs, from where water can flow under gravitational force in the distribution system, elevated reservoirs are constructed.
How do you find the capacity of a reservoir from a contour map?
The contour line indicating the full reservoir level (F.R.L) is drawn on the contour map. The area enclosed between successive contours are measured by planimeter (Figure 18.5). The volume of water between F.R.L and the river bed is finally estimated by using either Trapezoidal formula or Prismoidal formula.
What is maximum reservoir level?
Maximum Water Level (MWL): This id the water level that is ever likely to be attained during the passage of the design flood. It depends upon the specified initial reservoir level and the spillway gate operation rule. This level is also called sometimes as the Highest Reservoir Level or the Highest Flood Level.
What is the water storage capacity of reservoir is expressed in?
These 91 reservoirs have total live storage capacity of 161.993 BCM (Billion Cubic Meters), spread over 18 states and 12 river basins.
What are the functions of an elevated storage reservoir?
The main functions of elevated storage tanks in order of importance are: To discharge water into the mains during peak loads, thus raising the hydraulic grade line in nearby distribution mains, thus economizing on the size of mains.
What are the advantages of elevated storage?
Elevated water storage tanks are used to store water for fire protection and potable drinking water within a designated area or community. Elevated tanks allow the natural force of gravity to produce consistent water pressure throughout the system.
Which is the trapezoidal formula for finding capacity of reservoir?
TRAPEZOIDAL FORMULA According to end-area formula,the volume between two cross-sections having areas A1 and A2. V=1/2(A1+A2)*D where,D is the distance between two sections. For a series of cross-sections at a regular interval of D ,the total volume.
How do you find volume with height and spot?
For every sample area we calculate the height difference from spot height to formation level. We sum all 4 heights and divide by 4 to get the mean height. If we multiply the mean height by the sample area (square or rectangular) we get the volume for this particular prism.