What is a drawdown curve and backwater curve?

The profile of water so. obtained is called Backwater Curve or Rising Curve. 3. If < 0, then in the direction of flow, depth of flow will decrease. The profile of water so obtained is called Drawdown Curve or Dropdown Curve or Falling Curve.

What are backwater curves?

Abstract. The transition curves of a nearly uniform flow state or, in general, the free surface profiles in open channels are designated backwater curves. They provide, for steady flow, the most general surface profile under a given discharge for specified boundary conditions.

Which of the following profile is known as drawdown curve?

S1 profiles begin with rise at the upstream end, then becomes horizontal, for example where a steep channel enters a pool. S2 is called a drawdown curve found at the downstream end of a channel enlargement.

What is a backwater profile?

Profile of water surface elevation above a specified reference level along a flow path, usually upstream from an obstruction.

How do you calculate the length of a backwater curve?

c — the coefficient applicable to the particular channel in the formula (y = c A/RS ) for the discharge of the channel. 2 S = 32-2. the total length of the backwater curve, as given by this formula, is theoretically infinite.

When so SC and YC yn it is called as?

Explanation: When the slopes have a condition of So > 0 and Yn < Yc, it is called as steep slope. It is denoted as ‘S’. Steep slope is classified into three zones.

What is the length of backwater curve?

2 S = 32-2. the total length of the backwater curve, as given by this formula, is theoretically infinite.

Why hydraulic jump is important?

Hydraulic jumps are an important natural phenomenon with many engineering applications. Hydraulic jumps are often engineered into hydraulic systems to dissipate fluid mechanical energy into heat. This reduces the potential for damage by high velocity liquid jetting from spillways.

What is drawdown in groundwater?

Drawdown is a term applied to the maximum lowering of the groundwater table caused by pumping or artesian flow (Figure D60). It is measured as the difference between the initial level of water in a well before pumping, and the static, or stabilized, level of water after a long period of pumping.

What is drawdown geography?

Drawdown is a change in groundwater level due to an applied stress, caused by events such as: Pumping from a well. Pumping from a neighbouring well. Intensive water taking from local area. Seasonal declines as recharge rates lower.