Thoma Surge Tank Area Stability Calculator

Hydroelectric Hydraulic Transients: Determine critical Thoma cross-sectional area, governor stability margin, oscillation period, and maximum upsurge.

Conduit & Operating Parameters

Headrace Length $L_t$ (m):

Headrace Area $A_t$ ($m^2$):

Gross Head $H_0$ (m):

Full Rated Flow $Q_0$ ($m^3/s$):

Tunnel Head Loss $h_{f0}$ (m):

Design Safety Factor $n$:

Proposed Tank Diameter $D_{tank}$ (m):

Thoma Stability & Sizing Results

Thoma Area ($A_{th}$)

-- $m^2$

Recommended Area

-- $m^2$

Proposed Area ($A_s$)

-- $m^2$

Stability Status

Oscillation Dynamic Characteristics

• Minimum Thoma Diameter ($D_{th}$): -- m

• Recommended Diameter ($D_{rec}$): -- m

• Oscillation Period ($T = 2\pi \sqrt{L_t A_s / g A_t}$): -- s

• Max Sudden Shutdown Upsurge ($Z_{max}$): -- m

• Friction Damped Maximum Surge ($Z_*$): -- m

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Thoma Surge Tank Area Stability Calculator

Conduit & Operating Parameters

Thoma Stability & Sizing Results

Oscillation Dynamic Characteristics

Frequently Asked Questions