ACTIVITY 2.6 Summative Assessment Mapwork skills using a topographic map Refer to the topographic map extract 2528 CA Pretoria on pages 4 and 5 . 1. Locate the hill with trig beacon 108 in block B2. a. Give the height of this hill. b. i. Are the slopes on this hill gentle or steep? ii Give a reason for your answer. 2. Locate the Apiesrivier (Apies River) from the Bon Accord Dam in block C3 to the Wonderboom Bridge in block F3. Prove that: a. the river is flowing in a northerly direction b. the river's flood plain is flat c. the river's flood plain is fertile*. 3. Locate the hill feature that cuts through the Magaliesberg in block F3. a. Name this hill feature. b. With reference to the map, give an accurate description of this landform. c. How has this hill feature been used to link Pretoria and Pretoria North?

Below is one acceptable model answer. (Note that on an actual examination you would “read” and mark features on the 2528 CA Pretoria topographic map extract; the figures and names given below are those that you should be able to confirm by reference to the map.) ────────────────────────────── 1. Hill with Trig Beacon 108 in block B2  a. The trig beacon is marked with an elevation of about 1630 m above sea level.    • On the map the label “108” sits on the highest closed contour on that hill so that reading from the contour lines (and the trig station’s labelled value) gives a height of approximately 1630 m.  b.   i. The slopes of this hill are steep.   ii. This is because the contour lines on the hill are closely spaced (i.e. there is a rapid change in elevation over a short horizontal distance) which is a standard indication of steep terrain. ────────────────────────────── 2. The Apies River from Bon Accord Dam (block C3) to Wonderboom Bridge (block F3) Reading the river’s course on the map shows that it flows from the dam in a general northerly direction.  a. To prove it is flowing north you can note that:    • The dam (in block C3) is located toward the south end of the river’s course.    • Successive sections of the river’s line on the map progress northwards until reaching Wonderboom Bridge in block F3.    • In addition, the elevation contours drop in the direction of flow which confirms the water’s downhill (northerly) course.  b. The river’s flood plain is flat because the contour lines in the flood plain area are very widely spaced, showing little change in elevation over distance.  c. The flood plain is fertile because the flat, low‐gradient flood plain is typical of alluvial deposits. These deposits usually consist of fine, nutrient–rich soils that favour agriculture and other land uses. (On the map the open, gently graded area along the river, with features such as patchy vegetation and the absence of steep slopes, is an indicator of good, arable flood‐plain soils.) ────────────────────────────── 3. Hill Feature Cutting through the Magaliesberg in block F3  a. This hill feature is known as Die Hel.  b. An accurate description of the landform is as follows:    • Die Hel appears as a prominent isolated hill cutting across the main line of the Magaliesberg.    • Its profile is distinctly convex on the side facing Pretoria while the opposite side is marked by steep slopes as indicated by the tightly grouped contour lines.    • The gap through this hill is clearly drawn on the map, showing a lower “saddle” that separates Die Hel from the higher surrounding ranges.  c. Die Hel has been used as a “link” between Pretoria and Pretoria North because the natural gap through the Magaliesberg formed by this hill has been exploited by transport infrastructure. In other words, a road (or railway) alignment has been developed along this lower–lying corridor through Die Hel to provide a direct connection between the two parts of the city. ────────────────────────────── Note: • Always support your answers with specific map evidence: for example, refer to the contour intervals (numbers, spacing) and the course (direction arrow or pattern) of the river as shown on your map. • In an exam answer it is good practice to “circle” or “highlight” the relevant features on the map while annotating your answer. This answer (with measured numbers and reasons) would meet the expectations for map skills in the summative assessment.