Water Management. Images from wikimedia commons and other non-commercial use sources
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1 Water Management Images from wikimedia commons and other non-commercial use sources
2 Background: Runoff from building or pavement
3 Water runs off to stormwater pond, but how much?
4 Tree canopy absorbs fixed amount of rainfall
5 Soils Also: Assume soils absorb a fixed amount according to soil type, found in SSURGO table/polygons
6 Wish to estimate rainfall runoff reaching each of a set of inlet grates for stormwater ponds Assume tree canopy absorbs first 1/4 of any rainstorm Assume any rainfall on a building or pavement flows to inlet grates Assume soils absorb a fixed amount (inches) of each storm according to SSURGO table Data layers include: Tree canopy (raster) Building layer (vector polygons) Pavement layer (vector polygons) Stormwater pond inlets (vector points) DEM (raster)
7
8 How to approach analysis to provide water delivered to inlets? Data needs? Each requirement spawns a analysis branch - what are the operations that make up each branch? When is the best time to join branches?
9 Data layers include: Tree canopy (vector) Any other layers needed? Building layer (vector polygons) Pavement layer (vector polygons) Soils - SSURGO Stormwater pond inlets (vector points) DEM (raster)
10 Data layers include: Tree canopy (vector) Rainfall Building layer (vector polygons) Pavement layer (vector polygons) Soils - SSURGO Stormwater pond inlets (vector points) DEM (raster) Subtract interception from Rainfall Rainfall at surface (RAS) Subtract Absorption from RAS Runoff Overlay or Zonal sum Final output
11 Data layers include: Tree canopy (vector) How to use? Building layer (vector polygons) Pavement layer (vector polygons) Soils - SSURGO Stormwater pond inlets (vector points) DEM (raster) Rainfall Subtract interception from Rainfall Rainfall at surface (RAS) Subtract Absorption from RAS Runoff Overlay or Zonal sum Final output
12 Canopy Extent Recode, assign interception by categories, & convert to raster* Canopy Interception (CInt) Rainfall Subtract interception from Rainfall Rainfall at surface (RAS) Subtract Absorption from RAS Runoff Overlay or Zonal sum Final output
13 Data layers include: Tree canopy (vector) How to use? Building layer (vector polygons) Pavement layer (vector polygons) Soils - SSURGO Stormwater pond inlets (vector points) DEM (raster) Combine? Rainfall Subtract interception from Rainfall Rainfall at surface (RAS) Subtract Absorption from RAS Runoff Overlay or Zonal sum Final output
14 Create an Absorption Layer First identify impervious surfaces: Landcover LCov. & Buildings Buildings Union
15 Data layers include: Tree canopy (vector) How to use? Building layer (vector polygons) Pavement layer (vector polygons) Soils - SSURGO Combine? Create absorption layer? Stormwater pond inlets (vector points) DEM (raster)
16 Create an Absorption Layer Build soil absorption layer: Soils Recode, assign absorption level Soil absorption
17 Create an Absorption Layer: Union the two layers Landcover LCov. & Buildings Buildings Union Union Soil, LCov. & Buildings Soils Recode, assign absorption level Soil absorption
18 Create an Absorption Layer: Recode Union for surface absorption Soil, LCov. & Buildings Recode, assign absorption level, & convert to raster* Surface absorption (SAb) Rainfall Subtract interception from Rainfall Rainfall at surface (RAS) Subtract Absorption from RAS Runoff Overlay or Zonal sum Final output
19 Data layers include: Tree canopy (vector) How to use? Building layer (vector polygons) Pavement layer (vector polygons) Soils - SSURGO Combine? Create absorption layer? Stormwater pond inlets (vector points) Watersheds? DEM (raster)
20 Watershed Delineation Dem Fill Calc flow Direction Filled Dem Flow Direction Flow Accumulation Calc flow Accumultion Threshold flowpaths Flowpaths Snapped grates Inlet grates Calc. Watersheds Snap pour points Watersheds**
21 Combined Flowchart Buildings Landcover Union LCov. & Buildings Canopy Extent Union Recode, assign interception by categories, & convert to raster* Soil, LCov. & Buildings Canopy Interception (CInt) Rainfall Subtract interception from Rainfall Rainfall at surface (RAS) Soils Recode, assign absorption level Soil absorption Recode, assign absorption level, & convert to raster* Surface absorption (SAb) Subtract Absorption from RAS Runoff Dem Fill Calc flow Direction Filled Dem Flow Direction Flow Accumulation Calc flow Accumultion Threshold flowpaths Flowpaths Snapped grates Inlet grates Calc. Watersheds Snap pour points Watersheds** Overlay or Zonal sum Final output
22 Another Example: Park Site Selection
23 New Parks are: Within 0.5 miles of Census polygons with a density of more than 120 persons per square mile; Greater than 0.5 miles from an exisdng park Current land use of grass or vacant.
24 New Parks are: Within 0.5 miles of Census polygons with a density of more than 120 persons per square mile; Greater than 0.5 miles from an exisdng park Current land use of grass or vacant. Nope, reselects land with 0.5 miles of existing parks?
25 New Parks are: Within 0.5 miles of Census polygons with a density of more than 120 persons per square mile; Greater than 0.5 miles from an exisdng park Current land use of grass or vacant.
26 New Parks are: Within 0.5 miles of Census polygons with a density of more than 120 persons per square mile; Greater than 0.5 miles from an exisdng park Current land use of grass or vacant. Nope, again, may reselect area near existing parks
27 New Parks are: Within 0.5 miles of Census polygons with a density of more than 120 persons per square mile; Greater than 0.5 miles from an exisdng park Current land use of grass or vacant.
28 New Parks are: Within 0.5 miles of Census polygons with a density of more than 120 persons per square mile; Greater than 0.5 miles from an exisdng park Current land use of grass or vacant.
29 New Parks are: Within 0.5 miles of Census polygons with a density of more than 120 persons per square mile; Greater than 0.5 miles from an exisdng park Current land use of grass or vacant.
30 New Parks are: Within 0.5 miles of Census polygons with a density of more than 120 persons per square mile; Greater than 0.5 miles from an exisdng park Current land use of grass or vacant. Nope, doesn t buffer dense areas
31 New Parks are: Within 0.5 miles of Census polygons with a density of more than 120 persons per square mile; Greater than 0.5 miles from an exisdng park Current land use of grass or vacant.
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