PROJECT TITLE:

ONE$-$DIMENTIONAL HYDRAULIC FLOOD MODELLING$/$SIMULATION

USING HEC$-$RAS: SCENARIO BASED ON PONGOLA RIVER

I. PROJECT BRIEF

The Pongola River is situated in the Kwazulu$-$Natal $($Northern part$)$ of the Republic of

South Africa. The well$-$known hydraulic structure built on the river is the Pongolapoort

Dam. The river flows downstream the dam and reaches the Mozambique border.

i$)$ For water resources planning purpose in the catchment surrounding the dam,

you have been tasked to the carry out a one$-$dimensional hydraulic flood

modelling$/$simulation on a river reach $($namely the Pongola River reach $1)$

starting from cross section $1$ as presented in Figure $1.$ In this figure, points A

and $B$ are left and right bank stations of the main channel. Cross section $1$ is

the lower section $($i$.$e$.$ the most downstream point in the reach considered$).$ The

incremental distances along the reach $($from cross section $1)$ are given in Table

For the cross sections presented in this table, the corresponding points to $A$

and $B$ will be used respectively for left and right bank stations of the main

channel. Consecutive cross$-$sections in the reach are $250$ m apart. The

contraction and expansion coefficients are $0\mathrm{.}1$ and $0\mathrm{.}3$ respectively. A $2000$

$\frac{m^3}{s}$ flow is considered for sub$-$critical conditions $($starting from upper cross

section, i$.$e$.$ the most upstream section$).(30$ marks$)$