Kelsie Grabert- Hydro Lab 10/9

Kelsie Grabert- Hydro Lab 10/9 2. It is necessary to fill sinks in order to prevent pits of no data from forming. If sinks are not filled the data will reflect this and there will be map points that lack data. 3. There are eight directions assigned to the flow of water. The resulting delineation will differ from how water actually flows, since water can flow in any number of directions, not just eight. 4. The value for the gauge point is zero, meaning very little to no water drains into this area. - pixel value: 6928 - drainage area: 6928*100=692,800m2

5. By changing the stream threshold, the amount of stream area is changed. Areas that fall below the threshold will not be highlighted and selected as streams. Therefore, higher thresholds show less stream area. The str_500 makes it appear as though there are more streams while str_2000 shows fewer stream areas. Sometimes with very high threshold values, there can be gaps in the stream flow for areas that don’t receive enough accumulation, which affects the data. The outer edges are often areas with less accumulation and the ones that don’t show up, supporting the Horton stream order concept. - The lower threshold value produces a more extensive network of streams and the higher threshold value produces a more simplified version. - Horton’s Law of stream orders provides an accurate representation of how water flow volumes in a river are converged when two streams converge. - the drainage area increases as the stream order increases

6. The flow path is a much less direct route than the crow’s path. From the outlook to basecamp point, the flow path moves much farther south than in the crow’s path in order to move to the north again. The water flow path is defined by the elevation and contours of the land, as well as the flow accumulation. The water will have a greater chance of flowing to areas with greater accumulation.

6. In catchment 500 the area is 268,499.9 meters, while in catchment 2000 the area is much greater with a value of 694,800 meters. These values don’t correspond with the value in question 4.

- for cat_2000: 694,799 m2. It’s similar to the drainage area in Question 4, 692,800m2. - cat_500 shows more fragmented subwatershed. 8. These two maps show the watershed delineation with a threshold value of 500 and then 2000. The threshold 500 map is a more appropriate map in terms of readability and clarity. At threshold 500, there are many more, smaller watershed delineations than at threshold 2000. Threshold 500 takes into account many more stream areas and is most likely more reliable and accurate.