QUESTION $1$QUESTION $2(60)$

You have been tasked to carry out a preliminarily drought and flow reliability assessment of

the water resources system $($in Orange drainage system$),$ assumingly characterised by

annual total flow data $($in Million cubic meters$).$

Choose the verified data for the Orange river system $($drainage$),$ symbolised by D$,$ as per

nomenclature of DWS or Water Research Commission $($WRC$).$ Specifically, the flow gauge

on the Orange River, located in the sub$-$drainage namely D$1$ is used. The gauge no$.$ where

the flow data have been measured is D$1$H$003.$

Carry out the following tasks:

$2\mathrm{.}1.$ Write down your unique for visiting DWS website $(5)$

$2\mathrm{.}2.$ Display the time series of streamflow data, between $2000-$February and $2020-$

October. $($Show all screenshots of all steps to obtain the data. Your different

times on screenshots should be unique, hence different from any other student.

If found to be the same, your will be penalised with a ZERO.

$2\mathrm{.}3.$ Calculate the first drought threshold as third of maximum flow and the second

threshold as the midpoint between the maximum and the minimum flow.

$(10)$

$2\mathrm{.}4.$ Determine the annual flow reliability for the time series

$2\mathrm{.}5.$ Plot times series of streamflows and include the thresholds levels. Comment

on the plot obtained.

$2\mathrm{.}6.$ Determine the total deficits for the water resources based on the $2$ thresholds.

$(10)$

$2\mathrm{.}7.$ Give an assessment of the water resources system based on the results of the

tasks you have performed.

$(40)$

$1\mathrm{.}1.$ Estimate the average annual daily demand design flow $($ML$/$day$)$ for a water supply

scheme servicing a new development area close to Boksburg, in Gauteng Province. The

following data have been used for the water services $($on daily basis$)$:

The area has an abattoir of $50$ cattle heads and has $3$ schools having each $300$ learners and

operating between $8$ h $00$ and $14$ h $00.$ There are $4$ churches of $1000m^2$ each and $3$ sports

grounds covering $4000m^2$ each. The community has a combined stand size area of $120$ ha

and is assumed to be highly dense area. The inhabitants of the area will enjoy a wellness

center of $1000m^2.$ Municipal offices will be on a site of $6000m^2.$

$1\mathrm{.}1.$ Calculate the corresponding peakflow $($Megaliter$/$day$)(30)$

$1\mathrm{.}2.$ Based on design guidelines, approximate the real water loss from the water supply system

of the development.

$(5)$

$1\mathrm{.}3.$ Give a rational assessment of your results $(5)$

Note: For question $1\mathrm{.}1$ and $1\mathrm{.}2,$ where applicable use strictly UPPER values in the bracket, as

per newly design guidelines developed by Department of Human Settlements of South

Africa strictly apply. Failure to adhere to new guidelines nullifies your answer.