Watershed as an Unit Analysis WE 1 2023/2024 WEEK 2 ice-breaking bpkm Buku Pedoman Kerja Mahasiswa Jejaring Kompetensi Lulusan 7th Semester 8th Semester 6th Semester th Flow Diagram of Bachelor Degree Program 5 Semester st 1 Semester nd 2 Semester rd 3 Semester th University Courses 4 Semester Single Degree Program Semester 1 to 8 in UI Double Degree Program in UI Calculus 1 Calculus 2 Introd. to Civil Engineering System Construction Drawing Material Properties (2+1) Statics Physics I Physics 2 Physics Laboratory I Physics Laboratory 2 Statistic & Probabilistic Linear Algebra Semester 5 to 8 Continue to QUT or other Partner Universities Engineering Courses Civil Engineering Courses Civil Engineering Design Courses Elective Courses Integrated Character Building Course B Integrated Character Building Course A Advanced Calculus Numerical Computing Building Construction Surveying Road Geometric Design Pavement Design Solid Mechanics Structural Analysis Steel Structure 1 Concrete Structure 1 Basic Soil Mechnics Soil Mechanics Foundation Engineering Fluid Mechanics Hydraulics Water Engineering 1 Sport /Art 1). River Engineering 2). Concrete Structure 2 3). Sustainable Build Environment 4). Design of Integrated Solid Manag. 5). Pollution Prevention 6). Courses in other Study Program 7).Course in Master Degree Program 1). Steel Structure 2 2).Construction Methods in Geotechnics 3). Rain Management. 4). Urban Planning & Sanitation 5). Enviroenmental Impact Anal. & ISO 6). Courses in other Study Program 7).Course in Master Degree Program Capstone Project Water Engineering 2 Religion Internship Basic Chemistry Academic Writing Advanced Chemistry Engineering Economics Construction Management Ethics & Legal Aspect of Constr. Contract Engineering Transportation Enterpreneurship Methods & Constr. Equipment Health, Safety & Environment Protection Seminar Final Project Course Learning Outcome Part B Watershed as an unit analysis Course Learning Outcome Unit Analysis Unit analysis at Watershed Management Hydrological Area as Unit Analysis Source: DGWR, Ministry of Public Works Units for Watershed Assessment & Management Delineasi Batas Daerah Tangkapan Air A Guide to Defining the Boundaries of a Subwatershed Delineating Subwatershed Boundaries • Area typically between 1 and 10 sq miles • Boundaries are high points where a drop of water landing outside of the boundary would drain to a different stream • In urban areas, storm drainage networks can extend subwatershed boundaries beyond the topographic ridge • Soils and groundwater hydrology can also impact watershed boundaries What Is a Subwatershed? Subwatershed Mapping Why delineate subwatershed boundaries? • Influence of impervious cover is readily apparent • Less chance for confounding pollutant sources • Helps establish a clear regulatory authority and incorporate stakeholders into the mgt. process • Allows assessment steps to be conducted within a rapid time frame Center for Watershed Protection There are seven basic steps to delineate the subwatershed boundary: Step 1: Define the Origin Step 2: Identify All Streams That Will Flow Into the POI Step 3: Evaluate Surrounding Topography Step 4: Identify Breakpoints Step 5: Connect Breakpoints Step 6: Double Check Step 7: Measure the Area Subwatershed Delineation the Steps Center for Watershed Protection Step 1 Define the Origin Define the origin: This is usually located slightly below the confluence of two second order streams. Center for Watershed Protection Step 1, cont. Exercise discretion… a. Subwatershed size b. Jurisdictional boundaries c. Homogenous land use d. Ponds/lakes/reservoirs e. Existing monitoring stations f. Road crossings Step 2 Identify Streams Define all the streams that will flow into the POI Center for Watershed Protection Step 3 Evaluate Surrounding Topography Quickly evaluate surrounding topography using contours – A ridge or high area is indicated by a series of contour lines “pointing” towards a lower elevation – Steep slopes are indicated by contours that are close together Center for Watershed Protection Step 4 Identify Breakpoints Identify points of maximum elevation from the stream channel (breakpoints) Center for Watershed Protection Step 5 Connect Breakpoints Connect breakpoints to form boundary of subwatershed Cross contour lines at right angles Center for Watershed Protection Step 6 Double Check Check that the delineated area drains to stream Pretend you’re a drop of water – Sample point along the edge of boundary and make sure points inside boundary drain to stream and points outside drain to another stream – Water travels downhill perpendicular to contours Center for Watershed Protection Step 7 Measure the Area • Measure sub-watershed area – Use planimeter, square counting, or Geographic Information Systems (GIS) – This parameter will be useful for future calculations Watershed Delineation at Urban Area Exercise (L-01)
