The two arches have different inclinations and different dimensions, but both have
trapezoidal cross-sections, with soffit widths of 0.9 m (2.95 ft). In the case of the large arch,
the width of the top plate varies from 1.3 m (4.3 ft) at the crown to 2.2 m (7.2 ft) at both ends,
and the height varies from 1.3 to 2.2 m (4.3 to 7.2 ft). In the case of the small arch, the
trapezoid is 1.3 m (4.3 ft) at the top, 0.9 m (2.95 ft) at the soffit, and a constant 1.3 m (4.3 ft)
deep along the entire length.

Tianjin, a city with over 10 million inhabitants, is located about 120 km east of Beijing, the
capital of China. The river Haihe flows diagonally through this historical and cultural city. The
city is currently in the process of implementing the Haihe River Area Redevelopment Plan,
which will revitalize the entire downtown area. The goal is to establish the Haihe River area
into a unique financial, business and recreation center within the next five years. Under this
plan, the entire redevelopment area is divided into four distinct districts: a cultural heritage …