[alister.hood]

> How do I only make grid size in that location smaller?

Add a mesh refinement region. Page 3-10 in the 2D Modeling User’s Manual.
But be aware that introducing smaller cells may mean you need to user a smaller computation interval to keep the model stable. And there’s a good chance this won’t help – as Georgette mentioned, there’s a good chance your terrain isn’t actually low enough there anyway.

I would instead recommend using a simple circular or rectangular terrain modification at the end of the culvert, as Georgette suggested. Start on page 97 of the RAS Mapper User’s Manual.

[alister.hood]

“Perpendicular” is the only way that makes sense. The culvert is going through a road embankment or similar terrain feature that acts as a barrier to flow. Normally you should draw a 2D breakline along the crest of this feature. If there is a culvert through the feature you convert the 2D breakline into a 2D connection.
The angle it crosses should match reality, so it doesn’t need to be truly perpendicular (90 degrees).

[alister.hood]

Return-Path:
Received: from compute1.internal (compute1.nyi.internal [10.202.2.41])
by sloti1d2t14 (Cyrus 3.1.7-154-gfa7592a-fmstable-20190829v1) with LMTPA;
Thu, 29 Aug 2019 22:20:57 -0400
X-Cyrus-Session-Id: sloti1d2t14-1567131657-3214089-2-5915104737689049197
X-Sieve: CMU Sieve 3.0
X-Spam-known-sender: no
X-Spam-score: 0.0
X-Spam-hits: FREEMAIL_FROM 0.001, HTML_MESSAGE 0.001, RCVD_IN_DNSWL_NONE -0.0001,
SPF_HELO_NONE 0.001, SPF_PASS -0.001, LANGUAGES en, BAYES_USED none,
SA_VERSION 3.4.2
X-Spam-source: IP=’209.85.208.172′, Host=’mail-lj1-f172.google.com’, Country=’US’,
FromHeader=’com’, MailFrom=’com’
X-Spam-charsets: plain=’UTF-8′, html=’UTF-8′
X-Resolved-to: [email protected]
X-Delivered-to: [email protected]
X-Mail-from: [email protected]
Received: from mx5 ([10.202.2.204])
by compute1.internal (LMTPProxy); Thu, 29 Aug 2019 22:20:57 -0400
Received: from mx5.messagingengine.com (localhost [127.0.0.1])
by mailmx.nyi.internal (Postfix) with ESMTP id 3A7473C02FD
for ; Thu, 29 Aug 2019 22:20:57 -0400 (EDT)
Received: from mx5.messagingengine.com (localhost [127.0.0.1])
by mx5.messagingengine.com (Authentication Milter) with ESMTP
id 90105DCA57E;
Thu, 29 Aug 2019 22:20:57 -0400
ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=fm3; t=
1567131657; b=bpXQ5zLfQeNehGRQHV+xuUbOWkNZDRjplUd6B5gke2FOTM48bE
d8uufMcILKRKJ8IUI8h6X0xPR2mIcX2fzw/V/baEAYabfwsbopIqQOLqkQNg3+sy
UyR2c71yMCpA3tDP1gZf5mt6eo4AmTuP8vUlwmrPfcSnOstthAi16lka1lPEKKVD
3rHstKLQCmuXTESqcZ4tgVukJurkCXqYE+ykabnpViCqAWiPiEuKRn04KgyiXq8a
NZcEggr0a8WcW2lbTwEg3QG2pQDurlhzd8fTdlpLtgb+J6ZOm2QZ9BylCcoexcTn
eMfzUafSFt42YpSzxNhYAXz6AtDmnuQoHRjw==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=
messagingengine.com; h=mime-version:references:in-reply-to:from
:date:message-id:subject:to:content-type; s=fm3; t=1567131657;
bh=ChitUSflv4plwH2VgB6Xp6mOw7Zi9Si2PAboj/y6oJo=; b=gG9xtBneClCc
fuh3bEZkI7oYaCEcFV18z/IfYkpLnW5EZk9Yc9iaidsZhHJPBPvJi+Wixrx1VTyC
Hx/es4FrlzQ/uwPAKqvhAYGe1kFrDEuZRGy2zX6KY+9+dKhSwByosFX1Iis8m12H
BQ7yQOgjuTdcJMq7LNh+mPYz4nskyaelEWtU34NTWQuK3hctKSWYpA2xdftGjQBV
I6ZRSJKzFCSAFggV2PbHDF7oytb9wf1J6hdvTs9MnDsFpMZSjmWz2zo0Md7QAeZw
ocLE8i1ULkLmkIKnVay0RIp2+PGKaVlo2g8yZaaqt19f5NOX2mr6Y2cPEXIQiguR
BwGT4uqpLQ==
ARC-Authentication-Results: i=1; mx5.messagingengine.com; arc=none (no signatures found);
dkim=pass (2048-bit rsa key sha256) header.d=gmail.com
[email protected] header.b=W8cufg/y header.a=rsa-sha256
header.s=20161025 x-bits=2048;
dmarc=pass policy.published-domain-policy=none
policy.published-subdomain-policy=quarantine
policy.applied-disposition=none policy.evaluated-disposition=none
(p=none,sp=quarantine,d=none,d.eval=none) policy.policy-from=p
header.from=gmail.com;
iprev=pass smtp.remote-ip=209.85.208.172 (mail-lj1-f172.google.com);
spf=pass [email protected]
smtp.helo=mail-lj1-f172.google.com;
x-aligned-from=pass (Address match);
x-google-dkim=pass (2048-bit rsa key) header.d=1e100.net
[email protected] header.b=nBOzPlNt;
x-ptr=pass smtp.helo=mail-lj1-f172.google.com
policy.ptr=mail-lj1-f172.google.com;
x-return-mx=pass header.domain=gmail.com policy.is_org=yes
(MX Records found: alt3.gmail-smtp-in.l.google.com,alt2.gmail-smtp-in.l.google.com,alt1.gmail-smtp-in.l.google.com,gmail-smtp-in.l.google.com,alt4.gmail-smtp-in.l.google.com);
x-return-mx=pass smtp.domain=gmail.com policy.is_org=yes
(MX Records found: alt3.gmail-smtp-in.l.google.com,alt2.gmail-smtp-in.l.google.com,alt1.gmail-smtp-in.l.google.com,gmail-smtp-in.l.google.com,alt4.gmail-smtp-in.l.google.com);
x-tls=pass smtp.version=TLSv1.2 smtp.cipher=ECDHE-RSA-AES128-GCM-SHA256
smtp.bits=128/128;
x-vs=clean score=0 state=0
Authentication-Results: mx5.messagingengine.com;
arc=none (no signatures found);
dkim=pass (2048-bit rsa key sha256) header.d=gmail.com
[email protected] header.b=W8cufg/y header.a=rsa-sha256
header.s=20161025 x-bits=2048;
dmarc=pass policy.published-domain-policy=none
policy.published-subdomain-policy=quarantine
policy.applied-disposition=none policy.evaluated-disposition=none
(p=none,sp=quarantine,d=none,d.eval=none) policy.policy-from=p
header.from=gmail.com;
iprev=pass smtp.remote-ip=209.85.208.172 (mail-lj1-f172.google.com);
spf=pass [email protected]
smtp.helo=mail-lj1-f172.google.com;
x-aligned-from=pass (Address match);
x-google-dkim=pass (2048-bit rsa key) header.d=1e100.net
[email protected] header.b=nBOzPlNt;
x-ptr=pass smtp.helo=mail-lj1-f172.google.com
policy.ptr=mail-lj1-f172.google.com;
x-return-mx=pass header.domain=gmail.com policy.is_org=yes
(MX Records found: alt3.gmail-smtp-in.l.google.com,alt2.gmail-smtp-in.l.google.com,alt1.gmail-smtp-in.l.google.com,gmail-smtp-in.l.google.com,alt4.gmail-smtp-in.l.google.com);
x-return-mx=pass smtp.domain=gmail.com policy.is_org=yes
(MX Records found: alt3.gmail-smtp-in.l.google.com,alt2.gmail-smtp-in.l.google.com,alt1.gmail-smtp-in.l.google.com,gmail-smtp-in.l.google.com,alt4.gmail-smtp-in.l.google.com);
x-tls=pass smtp.version=TLSv1.2 smtp.cipher=ECDHE-RSA-AES128-GCM-SHA256
smtp.bits=128/128;
x-vs=clean score=0 state=0
X-ME-VSCause: gggruggvucftvghtrhhoucdtuddrgeduvddrudeifedgheegucetufdoteggodetrfdotf
fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdggtfgfnhhsuhgsshgtrhhisggvpdfu
rfetoffkrfgpnffqhgenuceurghilhhouhhtmecufedttdenucenucfjughrpeggfhgjhf
ffkffuvfgtsegrtderredttdejnecuhfhrohhmpeetlhhishhtvghrucfjohhougcuoegr
lhhishhtvghrrdhhohhougesghhmrghilhdrtghomheqnecukfhppedvtdelrdekhedrvd
dtkedrudejvdenucfrrghrrghmpehinhgvthepvddtledrkeehrddvtdekrddujedvpdhh
vghlohepmhgrihhlqdhljhduqdhfudejvddrghhoohhglhgvrdgtohhmpdhmrghilhhfrh
homhepoegrlhhishhtvghrrdhhohhougesghhmrghilhdrtghomhequcfukfgkgfepgeei
hedtnecuvehluhhsthgvrhfuihiivgeptd
X-ME-VSScore: 0
X-ME-VSCategory: clean
Received-SPF: pass
(gmail.com … _spf.google.com: Sender is authorized to use ‘[email protected]’ in ‘mfrom’ identity (mechanism ‘include:_netblocks.google.com’ matched))
receiver=mx5.messagingengine.com;
identity=mailfrom;
envelope-from=”[email protected]”;
helo=mail-lj1-f172.google.com;
client-ip=209.85.208.172
Received: from mail-lj1-f172.google.com (mail-lj1-f172.google.com [209.85.208.172])
(using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
(No client certificate requested)
by mx5.messagingengine.com (Postfix) with ESMTPS
for ; Thu, 29 Aug 2019 22:20:56 -0400 (EDT)
Received: by mail-lj1-f172.google.com with SMTP id x18so4989034ljh.1
for ; Thu, 29 Aug 2019 19:20:56 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=gmail.com; s=20161025;
h=mime-version:references:in-reply-to:from:date:message-id:subject:to;
bh=ChitUSflv4plwH2VgB6Xp6mOw7Zi9Si2PAboj/y6oJo=;
b=W8cufg/yZxbu0nfZvou4ZLD/iZCPtsCJ0rbb6jbBZl8VXFk0j7kqUjW6APnVHyzRT2
NG32AdgmPQSshtkUPExwqf6q4zenVVqFJ4l5+ZL6wxnHmMDKQ/B5Miszcb+lzGx26T6O
6o8PsjM5z2Cd/M45n+beeX5McNp8aepiQGdeNUDLfhyoxBcpjrsWrXm9EVhh8nSEoNmp
iNTpIAIPtzIfjqFtVOfy/U4q2K/WNVJPd7gLl6jj1gfrSoGU1dPppwpCcwCNVOq5wo9l
9Yu7EwCLiDbjH8a90hL9RN/ntC2E3Q2GXbDke0e/O88N1/7u1/53Lk/JNdHS+Inc4N3G
2s2g==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=1e100.net; s=20161025;
h=x-gm-message-state:mime-version:references:in-reply-to:from:date
:message-id:subject:to;
bh=ChitUSflv4plwH2VgB6Xp6mOw7Zi9Si2PAboj/y6oJo=;
b=nBOzPlNtjg1fpxWktvFzqbdKFusMzx1ttiG+nyvp9fnIHG3YcN0jTS26go3GKL/sCf
w6xnx5DRwBfz9gXq4JLR6u4xtBffmUWLqv/Vx1Spdqea95m5ysclIMobThYT9MUNfChs
9I5d6+MYlzhpf5QnFzbuvM5mZxIAUKd/pXj1aw7XAecLOjB9be0ok1rnpqSHBREt80uD
vBibMMN/fM8pKiS1ogZH9P5tlwnwwpS2CtgDRbaZrCDU3HT5jAfG6S4QQGkXerCH8Nb8
ygqWo81eJDQiBr5hbZQ8W5PRU7NJBafAr99ol/1e19xOKfhd2dXuvrqGqv0jtI8npEqN
byGw==
X-Gm-Message-State: APjAAAW5m0lafeoKurFsPT/b7qJA6JLxovW4bU8VXhMSddtn0PndR9fJ
27hdaCFGJgYTSuazUir7MoSZf80x8b15lthpzlTpgw==
X-Google-Smtp-Source: APXvYqx2btQyWCzsmoBX7GtibmyP9lsIH8KwIDO0JJ3Upr1oirlWh/IvWILf7ijV+7liqX7CgVQNSVFS2v4AKsH8XQk=
X-Received: by 2002:a2e:a313:: with SMTP id l19mr7288174lje.32.1567131654527;
Thu, 29 Aug 2019 19:20:54 -0700 (PDT)
MIME-Version: 1.0
References: <[email protected]>
In-Reply-To: <[email protected]>
From: Alister Hood
Date: Fri, 30 Aug 2019 14:20:39 +1200
Message-ID:
Subject: Re: export D*V map
To: “hasansins [via HEC-RAS Help]”
Content-Type: multipart/alternative; boundary=”000000000000959ef105914c45bd”

–000000000000959ef105914c45bd
Content-Type: text/plain; charset=”UTF-8″

Hi,
It is a single band raster storing the value of V*D. I can’t remember
trying to load a single band raster into AutoCAD, but even if it works it
might just look all black or all white. You will want to control the
styling, probably using colour, perhaps to mimic how it looks in HEC-RAS.

I guess if by “AutoCAD” you mean Map3D then that can do it. But if you mean
normal AutoCAD you will need to style it in you favourite desktop GIS (I
recommend QGIS) and export a rendered image.

If you style it in QGIS, just do “Layer>Save As”, select “Rendered image”
and save as tiff or jpeg.
If you save as tiff, make sure to add a create option called “TFW”, with
value “YES”.
Once you have loaded the image into AutoCAD you can use the freeware
utility called georefimg, which reads the worldfile and moves the image to
the correct location and scale.

Regards.

–000000000000959ef105914c45bd
Content-Type: text/html; charset=”UTF-8″
Content-Transfer-Encoding: quoted-printable

Hi,

It is a sing=
le band raster storing the value of V*D. I can't remember trying to loa=
d a single band raster into AutoCAD, but even if it works it might just loo=
k all black or all white. You will want to control the styling, probably us=
ing colour, perhaps to mimic how it looks in HEC-RAS.

I guess if by "AutoCAD" you mean Ma=
p3D then that can do it. But if you mean normal AutoCAD you will need to s=
tyle it in you favourite desktop GIS (I recommend QGIS) and export a render=
ed image.

If you style i=
t in QGIS, just do "Layer>Save As", select "Rendered imag=
e" and save as tiff or jpeg.

If you save as tif=
f, make sure to add a create option called "TFW", with value &quo=
t;YES".

Once you have loaded the image into Aut=
oCAD you can use the freeware utility called georefimg, which reads the wor=
ldfile and moves the image to the correct location and scale.

Regards.

–000000000000959ef105914c45bd–

[alister.hood]

Return-Path:
Received: from compute1.internal (compute1.nyi.internal [10.202.2.41])
by sloti1d2t14 (Cyrus 3.1.6-663-gf46ad30-fmstable-20190607v1) with LMTPA;
Tue, 11 Jun 2019 07:49:46 -0400
X-Cyrus-Session-Id: sloti1d2t14-1560253786-758935-2-8718837259502049077
X-Sieve: CMU Sieve 3.0
X-Spam-known-sender: no
X-Spam-score: 1.3
X-Spam-hits: FREEMAIL_FROM 0.001, HTML_MESSAGE 0.001, ME_ZS_CLEAN -0.001,
RCVD_IN_DNSWL_NONE -0.0001, SPF_HELO_NONE 0.001, SPF_PASS -0.001,
URI_HEX 1.313, LANGUAGES en, BAYES_USED none, SA_VERSION 3.4.2
X-Spam-source: IP=’209.85.167.46′, Host=’mail-lf1-f46.google.com’, Country=’US’,
FromHeader=’com’, MailFrom=’com’
X-Spam-charsets: plain=’UTF-8′, html=’UTF-8′
X-Resolved-to: [email protected]
X-Delivered-to: [email protected]
X-Mail-from: [email protected]
Received: from mx5 ([10.202.2.204])
by compute1.internal (LMTPProxy); Tue, 11 Jun 2019 07:49:46 -0400
Received: from mx5.messagingengine.com (localhost [127.0.0.1])
by mailmx.nyi.internal (Postfix) with ESMTP id E9BC3680071
for ; Tue, 11 Jun 2019 07:49:45 -0400 (EDT)
Received: from mx5.messagingengine.com (localhost [127.0.0.1])
by mx5.messagingengine.com (Authentication Milter) with ESMTP
id 1EF6A541EE4;
Tue, 11 Jun 2019 07:49:45 -0400
ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=fm3; t=
1560253785; b=e9Ik2HFi23ktrTiAkvz/8sKGK3NJ0c92hYYR1GIYn4gCCWYlSy
+xa3Kwa7zQpSokM+EckCARHl1TGOxGVTqIvHfrNd8k6+Ga4N2PbywGFemUinDBnU
b7udczKkTAwhb93EQKxrMw/GLfcAsLu/fhHgApdNXMIbRr3h2g91leIs9SElYfdj
URn5PqOqJou9BD56pXYumrc12GcdRRBHD32q3pq/vtcFw5Jv2F00MBgvIHwycE0u
c5Ddt2kHXGl4INbZtGuagiMSk6RyR4oRjc4w7SgF83x4jsMRbmmi2njQaGhwfx3C
nqJ9wZlxUSn56Yi9G8ynlHEthL5MPxaY90TA==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=
messagingengine.com; h=mime-version:references:in-reply-to:from
:date:message-id:subject:to:content-type; s=fm3; t=1560253785;
bh=AxyjYNJ76W2vy14KCPO1CS96xt0qq3GRab5p4ELqiQI=; b=JDw7LRya1dgX
3SrAIYqTXr3ia8NlpaSCoaGhk6fyyS5GqNes9rdDgLdBZteOihAQw/SzsS0QupX0
rddz4TPFl7EgmOseRBh3ODop0tpIyKKHmvOgn7c+GR3Ymqitx12c5jP4vV06+sna
ugKXm+NQp0cht9fmyzShY+fU7widWSW8gGyhTDioDDaSWgWPaQvxB5ReHCxEue7t
PeW06a7FFbYyENxWhn4wON33Ve+yJif4LDqxWKURGSc7KCLYDR4qqJ9wI8hVSZcK
RQJbnyzBdRaI8jtjjK1vc4tSpHL0WOiocJEARRAzmbcyJw0Fv2EXu3NIQCMWTTkz
CRiut53yoQ==
ARC-Authentication-Results: i=1; mx5.messagingengine.com; arc=none (no signatures found);
dkim=pass (2048-bit rsa key sha256) header.d=gmail.com
[email protected] header.b=Jy4/MJ7n header.a=rsa-sha256
header.s=20161025 x-bits=2048;
dmarc=pass policy.published-domain-policy=none
policy.published-subdomain-policy=quarantine
policy.applied-disposition=none policy.evaluated-disposition=none
(p=none,sp=quarantine,d=none,d.eval=none) policy.policy-from=p
header.from=gmail.com;
iprev=pass smtp.remote-ip=209.85.167.46 (mail-lf1-f46.google.com);
spf=pass [email protected]
smtp.helo=mail-lf1-f46.google.com;
x-aligned-from=pass (Address match);
x-google-dkim=pass (2048-bit rsa key) header.d=1e100.net
[email protected] header.b=bVrsnzmI;
x-ptr=pass smtp.helo=mail-lf1-f46.google.com
policy.ptr=mail-lf1-f46.google.com;
x-return-mx=pass header.domain=gmail.com policy.is_org=yes
(MX Records found: alt4.gmail-smtp-in.l.google.com,alt3.gmail-smtp-in.l.google.com,alt1.gmail-smtp-in.l.google.com,gmail-smtp-in.l.google.com,alt2.gmail-smtp-in.l.google.com);
x-return-mx=pass smtp.domain=gmail.com policy.is_org=yes
(MX Records found: alt4.gmail-smtp-in.l.google.com,alt3.gmail-smtp-in.l.google.com,alt1.gmail-smtp-in.l.google.com,gmail-smtp-in.l.google.com,alt2.gmail-smtp-in.l.google.com);
x-tls=pass smtp.version=TLSv1.2 smtp.cipher=ECDHE-RSA-AES128-GCM-SHA256
smtp.bits=128/128;
x-vs=clean score=0 state=0;
x-zs=clean
Authentication-Results: mx5.messagingengine.com;
arc=none (no signatures found);
dkim=pass (2048-bit rsa key sha256) header.d=gmail.com
[email protected] header.b=Jy4/MJ7n header.a=rsa-sha256
header.s=20161025 x-bits=2048;
dmarc=pass policy.published-domain-policy=none
policy.published-subdomain-policy=quarantine
policy.applied-disposition=none policy.evaluated-disposition=none
(p=none,sp=quarantine,d=none,d.eval=none) policy.policy-from=p
header.from=gmail.com;
iprev=pass smtp.remote-ip=209.85.167.46 (mail-lf1-f46.google.com);
spf=pass [email protected]
smtp.helo=mail-lf1-f46.google.com;
x-aligned-from=pass (Address match);
x-google-dkim=pass (2048-bit rsa key) header.d=1e100.net
[email protected] header.b=bVrsnzmI;
x-ptr=pass smtp.helo=mail-lf1-f46.google.com
policy.ptr=mail-lf1-f46.google.com;
x-return-mx=pass header.domain=gmail.com policy.is_org=yes
(MX Records found: alt4.gmail-smtp-in.l.google.com,alt3.gmail-smtp-in.l.google.com,alt1.gmail-smtp-in.l.google.com,gmail-smtp-in.l.google.com,alt2.gmail-smtp-in.l.google.com);
x-return-mx=pass smtp.domain=gmail.com policy.is_org=yes
(MX Records found: alt4.gmail-smtp-in.l.google.com,alt3.gmail-smtp-in.l.google.com,alt1.gmail-smtp-in.l.google.com,gmail-smtp-in.l.google.com,alt2.gmail-smtp-in.l.google.com);
x-tls=pass smtp.version=TLSv1.2 smtp.cipher=ECDHE-RSA-AES128-GCM-SHA256
smtp.bits=128/128;
x-vs=clean score=0 state=0;
x-zs=clean
X-ME-VSSU: VW5zdWI9aHR0cDovL2hlYy1yYXMtaGVscC4xMDkxMTEyLm41Lm5hYmJsZS5jb20vdGVtcG
xhdGUvTmFtbFNlcnZsZXQuanRwP21hY3JvPXVuc3Vic2NyaWJlX2J5X2NvZGUmbm9kZT0x
JmNvZGU9WVd4cGMzUmxjaTVvYjI5a1FHZHRZV2xzTG1OdmJYd3hmRFkzT0RnM016Z3dOUT
09
X-ME-VSCause: gggruggvucftvghtrhhoucdtuddrgeduuddrudehhedgvdelucetufdoteggodetrfdotf
fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdggtfgfnhhsuhgsshgtrhhisggvpdfu
rfetoffkrfgpnffqhgenuceurghilhhouhhtmecufedttdenucenucfjughrpeggfhgjhf
ffkffuvfgtsegrtderredttdejnecuhfhrohhmpeetlhhishhtvghrucfjohhougcuoegr
lhhishhtvghrrdhhohhougesghhmrghilhdrtghomheqnecuffhomhgrihhnpehnrggssg
hlvgdrtghomhenucfkphepvddtledrkeehrdduieejrdegieenucfrrghrrghmpehinhgv
thepvddtledrkeehrdduieejrdegiedphhgvlhhopehmrghilhdqlhhfuddqfhegiedrgh
hoohhglhgvrdgtohhmpdhmrghilhhfrhhomhepoegrlhhishhtvghrrdhhohhougesghhm
rghilhdrtghomhequcfukfgkgfepkeelleeknecuvehluhhsthgvrhfuihiivgeptd
X-ME-VSScore: 0
X-ME-VSCategory: clean
X-ME-ZSResult: clean
Received-SPF: pass
(gmail.com … _spf.google.com: Sender is authorized to use ‘[email protected]’ in ‘mfrom’ identity (mechanism ‘include:_netblocks.google.com’ matched))
receiver=mx5.messagingengine.com;
identity=mailfrom;
envelope-from=”[email protected]”;
helo=mail-lf1-f46.google.com;
client-ip=209.85.167.46
Received: from mail-lf1-f46.google.com (mail-lf1-f46.google.com [209.85.167.46])
(using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
(No client certificate requested)
by mx5.messagingengine.com (Postfix) with ESMTPS
for ; Tue, 11 Jun 2019 07:49:43 -0400 (EDT)
Received: by mail-lf1-f46.google.com with SMTP id p24so9068446lfo.6
for ; Tue, 11 Jun 2019 04:49:43 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=gmail.com; s=20161025;
h=mime-version:references:in-reply-to:from:date:message-id:subject:to;
bh=AxyjYNJ76W2vy14KCPO1CS96xt0qq3GRab5p4ELqiQI=;
b=Jy4/MJ7n3VtTqflUo5qObTil+0gSvsp5qisCQAz817FVx8RlAU/8mEu04BG9Rmu0IE
ilJfRzVL+5Y5hZjx95hOfATk50yWm54ULClpXUuvXfRx1A5ROrXXfxBW7/5ysrrP5297
Ni6eA6lUnx2lMG73+mlfHQ2ErEJqJeRtKX2N2lVgFGFou9MypviXH0PPl3b+sCYYATwt
YX2g8ErK8RfDgX35fCvKAEHS8w0SaTWvJAyXzuIEC4w3O59MCL/9XjcuBTdb1P4OF2Hd
SdqbKdV/4Qc/mh1L/AIorsCOPmqTQW45XRPgwmaXREltMtf0XmU02pn2r6T0ciYbSZZ0
OGOQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=1e100.net; s=20161025;
h=x-gm-message-state:mime-version:references:in-reply-to:from:date
:message-id:subject:to;
bh=AxyjYNJ76W2vy14KCPO1CS96xt0qq3GRab5p4ELqiQI=;
b=bVrsnzmI/J//ZuRgsbZ57UV2wvV7Kt91CIlR3evRfwey5Ngj0yqQAMwddhjKgP24g0
DyHn0hMwSfsjSUcJU+i2Ervfr62Mef6T4A6KYzGK0jPzoxC38BHSbOtOpOSimts9c0dV
ilAC3uFdkI+mqbnfFN9N40BDqIFg9yXvYmVj3Fsx23ziM/yMQJfHCD6KQM0nL7bk3I2M
QHyixDbIBrH8TILwJeFZHNMtol0holdaN67QiaWPeZzsTUFyvGbv4EoRKKP9Z1/K7N6G
N6XlENbzd4PokB10QqH2ti7B77+1L5TVQ40v0yW6xnxraJ9xm0XNbZMNOzfWuVTrevtF
M8hg==
X-Gm-Message-State: APjAAAVTZ5JDLA4Rtke44lvcN1ZlwVYIso+1YGAAw5nAUYvYXQg+Jdv9
HggQZJ7hRD0EERwm6FS4jHavLxY5MaY9MJBdwYz8cQ==
X-Google-Smtp-Source: APXvYqw/aDFcLrJZc/cTLOwM2JN83KD2Y4PsP+NEC/QWCbVar8PRr19W0WusFUB+CrlNCQdWJwhI9DFhO3lYvV1AEvI=
X-Received: by 2002:ac2:43b7:: with SMTP id t23mr35946708lfl.110.1560253781529;
Tue, 11 Jun 2019 04:49:41 -0700 (PDT)
MIME-Version: 1.0
References: <[email protected]> <[email protected]>
In-Reply-To: <[email protected]>
From: Alister Hood
Date: Tue, 11 Jun 2019 23:49:28 +1200
Message-ID:
Subject: Re: deactivate 2d cell
To: “M. L. Harris [via HEC-RAS Help]”
Content-Type: multipart/alternative; boundary=”000000000000685b06058b0ae40b”

–000000000000685b06058b0ae40b
Content-Type: text/plain; charset=”UTF-8″
Content-Transfer-Encoding: quoted-printable

Hi guys,
Personally I don’t like the “high roughness” approach, so I either
rasterize the buildings and merge with the terrain, or if I am lazy
sometimes I can model them satisfactorily just by using weirs.

Also, be aware that:
– Just rasterising buildings and merging them with your terrain won’t make
them act as a barrier to flow unless you use a very small cell size;
typically in HEC-RAS you would use a cell size at least as large as most
buildings, in which case you might need to mess around with refinement
regions and break lines to try to get it right.
– Similarly, the high roughness method would require very small cells as
HEC-RAS just applies a single roughness to each cell.

Regards,
Alister

On Tue, 11 Jun 2019, 5:41 AM M. L. Harris [via HEC-RAS Help], < [email protected]> wrote:

> What if you set the Manning’s roughness value to something unreasonably
> high for the grid cell or region?
>
> Another thing I have done in 2D flow areas is to “superimpose” the
> buildings themselves onto the terrain so that they act as physical
> obstructions to flow.
>
> M. L. Harris, P.E. | Water Resources Engineer
>
>
> ——————————
> If you reply to this email, your message will be added to the discussion
> below:
>
> http://hec-ras-help.1091112.n5.nabble.com/deactivate-2d-cell-tp7629p7637.=
html
> To start a new topic under HEC-RAS Help, email
> [email protected]
> To unsubscribe from HEC-RAS Help, click here
> <http://hec-ras-help.1091112.n5.nabble.com/template/NamlServlet.jtp?macro=
=3Dunsubscribe_by_code&node=3D1&code=3DYWxpc3Rlci5ob29kQGdtYWlsLmNvbXwxfDY3=
ODg3MzgwNQ=3D=3D>
> .
> NAML
> <http://hec-ras-help.1091112.n5.nabble.com/template/NamlServlet.jtp?macro=
=3Dmacro_viewer&id=3Dinstant_html%21nabble%3Aemail.naml&base=3Dnabble.naml.=
namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.v=
iew.web.template.NodeNamespace&breadcrumbs=3Dnotify_subscribers%21nabble%3A=
email.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble=
%3Aemail.naml>
>

–000000000000685b06058b0ae40b
Content-Type: text/html; charset=”UTF-8″
Content-Transfer-Encoding: quoted-printable

=
Hi guys,=C2=A0

Personally I don't like the "high roughness" approac=
h, so I either rasterize the buildings and merge with the terrain, or if I =
am=C2=A0lazy sometimes=
=C2=A0I can model them satisfactoril=
y just by using weirs.

Also, be aware that:

– Just rasterising buildings and merging them with your t=
errain won't make them act as a barrier to flow unless you use a very s=
mall cell size; typically in HEC-RAS=C2=A0you would use a cell size=C2=A0at least as large as most buildings, in which case you might=
need to mess around with refinement regions and break lines to try to get =
it right.

– Similarly, the high roughness method would require very small cells a=
s HEC-RAS just applies a single roughness to each cell.

Regards,

Alister

On Tue, 11 Jun 2019, 5:41 AM M. L. Harris [via HEC-RA=
S Help], <ml+s109=
[email protected]> wrote:

il_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-lef= t:1ex">

What if you set the Manning's roughness value to something unreasonabl=
y high for the grid cell or region?

Another thing I have done in 2D flow areas is to "superimpose&=
quot; the buildings themselves onto the terrain so that they act as physica=
l obstructions to flow.

=09
=09

M. L. Harris, P.E. | Water Resources Engineer

---

If you reply to this email, your message =
will be added to the discussion below:

http://hec-ras-help.1=
091112.n5.nabble.com/deactivate-2d-cell-tp7629p7637.html

To start a new topic under HEC-RAS Help, email ml+s1091112n=
[email protected]
To unsubscribe from HEC-RAS Help, click here.
NAML

–000000000000685b06058b0ae40b–

[Author]

Posts