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Welcome to the October 2017 OptiSurface Newsletter.

The News Of The Month features users around the world promoting OptiSurface.

The Design Of The Month demonstrates how to use the Runoff Analysis feature to highlight erosive areas and fix them with landform design.

The Feature Of The Month explains the functionality of our Runoff Analysis Tool.

If you have any problems or questions please reply to this email or call me on +61 405-686-425 (Australia) or Preston on +1 870-340-2020 (USA).

 
Regards
Graeme Cox & The OptiSurface Team
DAVCO OptiSurface
Mobile: +61 405 686 425   Skype: graemejcox
Web:  www.optisurface.com  
News: www.twitter.com/OptiSurface
"Celebrating 750,000 Acres of Optimized Agricultural Earthworks"

P.S.
If you haven't taken advantage of OptiSurface yet, we're offering a special service where we will take your topographic data for a field and conduct some FREE analysis and design.  Go here to find out more: http://www.optisurface.com/nlt/
News Of The Month
From our Twitter and Facebook feeds.

Toerper Tech‏ @ToerperTech Aug 2

Things are lining up for a great and informative #WaterManagement event Thursday. Real farm surveys, demo #optisurface analysis field

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Nils van Tilbeurgh‏ @nilsvtilbeurgh Aug 4

Everything for the soil: seedling seedlings, parcel springs by @Renevdslikke with @OptiSurface
and 400 tons of compost are brought #boerbewust

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OptiSurface‏ @OptiSurface Aug 16

We're excited to announce a new feature in OptiSurface Designer for Optimizing Furrow Irrigation. https://youtu.be/VuvmLi9fWuo via @YouTube

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PLS‏ @Precision_Land Sep 5

The ULTIMATE tool to create surface designs to be the most efficient and effective at land forming your fields! #drainage @OptiSurface


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OptiSurface‏ @OptiSurface Sep 14

How to use runoff simulation to assess erosion risk and test landform designs to solve it. From Russia.


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OptiSurface‏ @OptiSurface Sep 28

Nice image visualization comparing OptiSurface before and after topography by Geosem: http://geosem.ca/services/nivellement-des-sols/ …


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Design Of The Month
Solving Erosion Problems with the aid of Runoff Analysis
A client in Russia is looking for a solution for their field where "soil is taken away by heavy rains".

Erosion rills can be seen in Google Earth as shown below.

Google Earth

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Existing Topography

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Existing Runoff Analysis

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Proposed Topography

An OptiSurface 1Way design was generated for the field.  The reason for erosion is due to the concentration of water flow as shown by the red velocity arrows in the Runoff Analysis.

The solution is to spread out the flow, therefore subzones were added with very high smoothing (700 m/%) which smooths out the area to create almost straight contour lines.
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Proposed Cut/Fill Map

Earthworks ended up at 141 m3/ha and most of the work goes where the subzones are.
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Proposed Runoff Analysis

Running the Runoff Analysis over the Proposed Topography shows great improvement on runoff velocities.  It now shows yellow velocity arrows which is about 0.6m/s and spread out across the area.
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Feature Of The Month
Overview:  The Runoff Analysis functionality allows you to calculate runoff depth and velocity maps during a storm event (e.g. 1 in 5yr storm). The outputs allow the designer to assess the risk of erosion (high velocity) and overtopping of furrows (depth greater than furrow) for the existing topography or a particular landform design.

Displayed by:
 Tools > Runoff Analysis

Appearance:

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Topography

Surface:  Select the surface the calculation will be based on: Existing Surface or Proposed Surface

Calculation Grid: The cell spacing of the grid that the drainage analysis is calculated on. 10m is a typical useful value.  Be careful not to go too small, calculation will increase dramatically as the grid spacing is reduced.  

Rainfall

Simulation Event Duration (hrs):  Defines how long the storm event that will be applied to the field.  It
needs to be large enough for the field to generate the highest runoff that it can.  1.5 hrs is generally long enough for fields of 500 m or yds long, for larger fields you need to go proportionally longer.  It is the time for water from one end of the field to run-off to the other end of the field.  This is also know as the Critical Duration.

1hr Design Rainfall Depth (mm
):  Defines the rainfall intensity. Best to use the rainfall data from your location.  A good number to use is the maximum rainfall you get every 5 years on average in 1 hour.

24hr Design Rainfall Depth (mm):  Defines the rainfall intensity. Best to use the rainfall data from your location.  A good number to use is the maximum rainfall you get every 5 years on average in 24 hour.
      
Hydraulic Roughness (n): This is the same as Mannings ‘n’ used commonly in engineering calculations. Here are some values as measured by Chow (1959):

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Runoff Curve Number, CN: The USDA SCS Runoff Equation uses the Runoff Curve Number (CN) to estimate the portion of rainfall that infiltrates and the remainder becomes runoff. For full details see Technical Release 55 Urban Hydrology for Small Watersheds, 210-VI-TR-55, Second Ed., June 1986.

Determination of CN depends on the fields soil type and cover conditions, which the model represents as hydrologic soil group, cover type, treatment, and hydrologic condition.  Use the tables below to guide you on an appropriate CN.

Soils are classified into hydrologic soil groups (HSG’s) to indicate the minimum rate of infiltration obtained for bare soil after prolonged wetting.

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Furrows or Beds


Furrow or Beds Restrict Water Flow Direction:  If furrows or beds exist tick this ON.

Furrow/Beds Direction (deg):  The direction of the furrows relative to north. Use the ‘Pick’ button to click two points to define the direction or type a number in. 

Furrow/Beds Spacing, w (m):  The spacing between the furrows/bed. i.e from one crest to the other as shown in the diagram on the dialog box.

Furrow/Beds Height, h (m):  The height of the intended furrows in the field. The water will build up in the furrow and only spill across the furrow when it exceeds this depth.

Furrow/Beds Side Slope, s (?h:1v):
The side slope of the furrow as shown in the diagram on the dialog box. This is the horizontal distance per 1 vertical. eg 1 mean 45% gradient and 3 would mean 33% gradient.

Furrow/Beds Bottom Width, b (m):
The width of the bottom of the furrow as shown in the diagram on the dialog box.


Inflow Subzone


Inflow for subzone parameter can be added to define water volume coming in from watershed into the field.

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