def moment_ult(L, D, gamma):
    """
    Ultimate static moment
    
    Parameters
    ----------------
    L -- Pile length
    D -- Pile diameter
    gamma -- Submerged unit weight
    
    Output
    ----------------
    m_ult -- Ultimate static moment
    """
    m_ult = L ** 3 * D * gamma * 0.6
    return m_ult
